Minute free-floating animal organisms which live in practically all natural waters.
A suborder of CRUSTACEA, order Diplostraca, comprising the water fleas. They are benthic filter feeders that consume PHYTOPLANKTON. The body is laterally compressed and enclosed in a bivalved carapace, from which the head extends.
A huge subclass of mostly marine CRUSTACEA, containing over 14,000 species. The 10 orders comprise both planktonic and benthic organisms, and include both free-living and parasitic forms. Planktonic copepods form the principle link between PHYTOPLANKTON and the higher trophic levels of the marine food chains.
A diverse genus of minute freshwater CRUSTACEA, of the suborder CLADOCERA. They are a major food source for both young and adult freshwater fish.
Free-floating minute organisms that are photosynthetic. The term is non-taxonomic and refers to a lifestyle (energy utilization and motility), rather than a particular type of organism. Most, but not all, are unicellular algae. Important groups include DIATOMS; DINOFLAGELLATES; CYANOBACTERIA; CHLOROPHYTA; HAPTOPHYTA; CRYPTOMONADS; and silicoflagellates.
A class of minute animals of the phylum Aschelminthes.
The sequence of transfers of matter and energy from organism to organism in the form of FOOD. Food chains intertwine locally into a food web because most organisms consume more than one type of animal or plant. PLANTS, which convert SOLAR ENERGY to food by PHOTOSYNTHESIS, are the primary food source. In a predator chain, a plant-eating animal is eaten by a larger animal. In a parasite chain, a smaller organism consumes part of a larger host and may itself be parasitized by smaller organisms. In a saprophytic chain, microorganisms live on dead organic matter.
Water containing no significant amounts of salts, such as water from RIVERS and LAKES.
Inland bodies of still or slowly moving FRESH WATER or salt water, larger than a pond, and supplied by RIVERS and streams.
The enrichment of a terrestrial or aquatic ECOSYSTEM by the addition of nutrients, especially nitrogen and phosphorus, that results in a superabundant growth of plants, ALGAE, or other primary producers. It can be a natural process or result from human activity such as agriculture runoff or sewage pollution. In aquatic ecosystems, an increase in the algae population is termed an algal bloom.
Instinctual behavior pattern in which food is obtained by killing and consuming other species.
Inland bodies of standing FRESHWATER usually smaller than LAKES. They can be man-made or natural but there is no universal agreement as to their exact size. Some consider a pond to be a small body of water that is shallow enough for sunlight to reach the bottom.
Community of tiny aquatic PLANTS and ANIMALS, and photosynthetic BACTERIA, that are either free-floating or suspended in the water, with little or no power of locomotion. They are divided into PHYTOPLANKTON and ZOOPLANKTON.
The pattern of any process, or the interrelationship of phenomena, which affects growth or change within a population.
A functional system which includes the organisms of a natural community together with their environment. (McGraw Hill Dictionary of Scientific and Technical Terms, 4th ed)
Total mass of all the organisms of a given type and/or in a given area. (From Concise Dictionary of Biology, 1990) It includes the yield of vegetative mass produced from any given crop.
Number of individuals in a population relative to space.
A subclass of cartilaginous fish comprising the SHARKS; rays; skates (SKATES (FISH);), and sawfish. Elasmobranchs are typically predaceous, relying more on smell (the olfactory capsules are relatively large) than sight (the eyes are relatively small) for obtaining their food.
Animals grouped according to ecological, morphological or genetic populations.
The variety of all native living organisms and their various forms and interrelationships.
A group of cold-blooded, aquatic vertebrates having gills, fins, a cartilaginous or bony endoskeleton, and elongated bodies covered with scales.
Divisions of the year according to some regularly recurrent phenomena usually astronomical or climatic. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
A great expanse of continuous bodies of salt water which together cover more than 70 percent of the earth's surface. Seas may be partially or entirely enclosed by land, and are smaller than the five oceans (Atlantic, Pacific, Indian, Arctic, and Antarctic).
A large subphylum of mostly marine ARTHROPODS containing over 42,000 species. They include familiar arthropods such as lobsters (NEPHROPIDAE), crabs (BRACHYURA), shrimp (PENAEIDAE), and barnacles (THORACICA).
Adverse effect upon bodies of water (LAKES; RIVERS; seas; groundwater etc.) caused by CHEMICAL WATER POLLUTANTS.
A genus of GREEN ALGAE in the family Scenedesmaceae. It forms colonies of usually four or eight cylindrical cells that are widely distributed in freshwater and SOIL.
The study of the origin, structure, development, growth, function, genetics, and reproduction of organisms which inhabit the OCEANS AND SEAS.
A genus of RNA viruses in the family BIRNAVIRIDAE infecting fish, mollusks, and crustaceans. It is transmitted both vertically and horizontally with no known vectors. The natural hosts are salmonids and the type species is INFECTIOUS PANCREATIC NECROSIS VIRUS.
A genus of CRUSTACEA of the order ANOSTRACA, found in briny pools and lakes and often cultured for fish food. It has 168 chromosomes and differs from most crustaceans in that its blood contains hemoglobin.
An order of CRUSTACEA comprised of shrimp-like organisms containing body trunks with at least 20 segments. The are commonly used as aquarium food.
The collective name for islands of the Pacific Ocean east of the Philippines, including the Mariana, PALAU, Caroline, Marshall, and Kiribati Islands. (From Webster's New Geographical Dictionary, 1988, p761 & Room, Brewer's Dictionary of Names, 1992, p350)
An algal bloom where the algae produce powerful toxins that can kill fish, birds, and mammals, and ultimately cause illness in humans. The harmful bloom can also cause oxygen depletion in the water due to the death and decomposition of non-toxic algae species.
The class of true jellyfish, in the phylum CNIDARIA. They are mostly free-swimming marine organisms that go through five stages in their life cycle and exhibit two body forms: polyp and medusa.
The salinated water of OCEANS AND SEAS that provides habitat for marine organisms.
Behavioral responses or sequences associated with eating including modes of feeding, rhythmic patterns of eating, and time intervals.
The flow of water in enviromental bodies of water such as rivers, oceans, water supplies, aquariums, etc. It includes currents, tides, and waves.
The presence of bacteria, viruses, and fungi in water. This term is not restricted to pathogenic organisms.
The interaction of persons or groups of persons representing various nations in the pursuit of a common goal or interest.
The longterm manifestations of WEATHER. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Any significant change in measures of climate (such as temperature, precipitation, or wind) lasting for an extended period (decades or longer). It may result from natural factors such as changes in the sun's intensity, natural processes within the climate system such as changes in ocean circulation, or human activities.
Water-soluble, copper-containing low molecular weight polypeptides obtained from the culture medium of Streptomyces verticillus. They are specific inhibitors of DNA synthesis in bacteria and have been found to act as antitumor agents. They have also been used against rust fungi of plants.
Long chain organic acid molecules that must be obtained from the diet. Examples are LINOLEIC ACIDS and LINOLENIC ACIDS.
Marine ridges composed of living CORALS, coral skeletons, calcareous algae, and other organisms, mixed with minerals and organic matter. They are found most commonly in tropical waters and support other animal and plant life.
The general name for a group of fat-soluble pigments found in green, yellow, and leafy vegetables, and yellow fruits. They are aliphatic hydrocarbons consisting of a polyisoprene backbone.
A class in the phylum CNIDARIA, comprised mostly of corals and anemones. All members occur only as polyps; the medusa stage is completely absent.
Anomaly of the tooth, found chiefly in upper lateral incisors. It is characterized by invagination of the enamel at the incisal edge.
A trace element that is required in bone formation. It has the atomic symbol Sn, atomic number 50, and atomic weight 118.71.

Molecular evidence of cryptic speciation in planktonic foraminifers and their relation to oceanic provinces. (1/255)

The fossil record of planktonic foraminifers is a key source of data on the biodiversity and evolution of marine plankton. One of the most distinctive foraminiferal taxa, Orbulina universa, widely used as a stratigraphic and paleoclimatic index, has always been regarded as a single species. Here we present a phylogenetic analysis of Orbulina small subunit rDNA sequences from 25 pelagic stations covering 100 degrees latitude in the Atlantic Ocean. The genetic data reveal the presence of three cryptic species, whose distribution is clearly correlated to hydrographic provinces, and particularly to sea-surface total chlorophyll a concentration. Our results, together with previous studies, suggest that a considerable part of the diversity among planktonic foraminifers has been overlooked in morphological taxonomies. Our data also support the idea that planktonic foraminifers, even if adapted to particular hydrographic conditions, are high-dispersal organisms whose speciation may be similar to that of other high-dispersal taxa in which reproductive mechanisms and behavior, rather than just geographic barriers to dispersal, play key roles in species formation and maintenance.  (+info)

Reconstruction of the Amazon Basin effective moisture availability over the past 14,000 years. (2/255)

Quantifying the moisture history of the Amazon Basin is essential for understanding the cause of rain forest diversity and its potential as a methane source. We reconstructed the Amazon River outflow history for the past 14,000 years to provide a moisture budget for the river drainage basin. The oxygen isotopic composition of planktonic foraminifera recovered from a marine sediment core in a region of Amazon River discharge shows that the Amazon Basin was extremely dry during the Younger Dryas, with the discharge reduced by at least 40% as compared with that of today. After the Younger Dryas, a meltwater-driven discharge event was followed by a steady increase in the Amazon Basin effective moisture throughout the Holocene.  (+info)

Specific toxic effect of dinoflagellate Heterocapsa circularisquama on the rotifer Brachionus plicatilis. (3/255)

Heterocapsa circularisquama (Dinophyceae), a noxious red tide dinoflagellate, is known to have a specifically lethal effect on shellfish, especially bivalves such as pearl oyster (Pinctada fucata), but no detrimental effects of this alga on fishes have not been observed so far. In this study, we found that H. circularisquama was toxic to a microzooplankton, a rotifer (Brachionus plicatilis) in a cell concentration-dependent manner, while the cultured supernatant or ultrasonic ruptured H. circularisquama had no significant toxic effect on the rotifer. Since no such toxic effects on the rotifer were observed in Chattonella marina, Heterosigma akashiwo, or Cochlodinium polykrikoides, other species of harmful red tide plankton, H. circularisquama may have a strictly specific toxic mechanism against the rotifer as well as bivalves.  (+info)

Paddlefish strike at artificial dipoles simulating the weak electric fields of planktonic prey. (4/255)

The freshwater paddlefish Polyodon spathula (Polyodontidae) feeds primarily on the water flea (Daphnia sp.), and previous studies suggest that these fish detect their planktonic prey using their rostral electrosensory system. Zooplankton produce direct-current and oscillating alternating-current electric fields containing multiple frequencies and amplitudes. We asked whether an inanimate electric field is sufficient to elicit paddlefish strikes equivalent to their feeding behavior. Juvenile paddlefish respond to artificial dipole stimuli by investigating the electric field and striking at the dipole electrode tips. These behavioral responses, scored as strikes, exhibit a bandpass characteristic with a maximum response between 5 and 15 Hz. Responses were less frequent at higher (20, 30, 40, 50 Hz) and lower (0.1, 0.5, 1 Hz) test frequencies, with a steep drop-off below 5 Hz. Strike rates also varied with stimulus intensity. Response frequency was greatest at 0.25 microA peak-to-peak amplitude, with reduced responses at lower and higher amplitudes (0.125 and 1.25 microA). Striking behavior was also influenced by water conductivity: strike rate was reduced at higher water conductivity. Dipole-elicited strikes exhibit behavioral plasticity. Fish habituate to repetitive dipole stimuli that are not reinforced by prey capture, and they dishabituate after food reinforcement. These experiments characterize paddlefish feeding strikes towards dipole electrodes at signal frequencies and intensities simulating the electric fields of zooplankton, their natural prey, and demonstrate that electric fields are sufficient to elicit feeding behavior. The results support the conclusion that paddlefish use their passive electrosensory system for planktivorous feeding.  (+info)

Factors controlling the expansion behavior of favia favus (Cnidaria: Scleractinia): effects of light, flow, and planktonic prey. (5/255)

Colonies of the massive stony coral Faviafavus were exposed to different flow speeds and levels of light, and to the addition of zooplankton prey. The relative importance of each factor in controlling polyp expansion behavior was tested. The coral polyps fully expanded when they were exposed to low light intensity (0-40 micromol m(-2) s(-1)) and high flow speed (15 cm s(-1)), regardless of prey presence. They also partially expanded under low and medium light (40-80 micromol m(-2) s(-1)) at medium flow speed (10 cm s(-1)). The corals expanded their polyps only when they were exposed to light levels below compensation irradiance (Icom: light level at which photosynthesis = respiration), which was determined to be about 107 +/- 24 micromol m(-2) s. The results presented here indicate that high flow, low light, and the presence of planktonic prey induce coral expansion. There is a hierarchy of response to these stimuli, in which light level and flow speed are dominant over prey presence. Coral response to these three factors is probably due to the relative importance of gas exchange and zooplankton prey.  (+info)

Phylogeography and regional endemism of a passively dispersing zooplankter: mitochondrial DNA variation in rotifer resting egg banks. (6/255)

We investigated the phylogeography of the salt water rotifer Brachionus plicatilis, a cyclical parthenogen with passive dispersal mechanisms, using resting eggs recovered from saline lake sediments. Individual resting eggs were obtained from a large selection of lakes which were representative of five endorheic basins and the chain of coastal ponds in the Iberian Peninsula. The novel use of resting eggs allows the integration of seasonal and annual variations as well as the impact of stochastic effects such as drift and local extinction. A 653 bp fragment of the mitochondrial cytochrome oxidase subunit I (COI) gene was sequenced from 98 eggs. Our results revealed a deep phylogeographical structure in this species, with a division into two main lineages with distinct geographical distributions, which probably diverged at the beginning of the Pleistocene period. Most of the mitochondrial DNA haplotypes were restricted to single lakes. Nested clade analysis supported Early Pleistocene fragmentation of populations, low gene flow and some long-distance colonization. These conclusions contrast strongly with previous ideas on rotifer biogeography and this pattern is consistent with a recolonization of the Iberian Peninsula from two glacial refugia. The results provide new insights into the processes responsible for the genetic diversification of passive dispersers, a life-history trait typical of zooplanktonic biotas.  (+info)

Induced pigmentation in zooplankton: a trade-off between threats from predation and ultraviolet radiation. (7/255)

Ultraviolet (UV) radiation is harmful to all life, and the ongoing depletion of the ozone layer is likely to affect interactions among both terrestrial and aquatic organisms. Some organisms have evolved adaptations to reduce radiation damage, such as the various types of protective pigmentation of freshwater zooplankton. However, strong pigmentation also increases vulnerability to visually hunting predators. Hence, where both UV radiation and predation are intense, zooplankton may be sandwiched between conflicting selective pressures: to be pigmented and to be transparent at the same time. Here, I show that the level of pigmentation in copepods is up to ten times higher in lakes without predatory fishes than where fishes are present. Moreover, animals from the same population exposed to either UV light or predator scent showed a 10% difference in pigmentation after only four days, suggesting that pigmentation is an inducible trait. Hence, individual copepods are not passive victims of selective predation or radiation damage, but adjust the level of pigmentation according to the prevailing threat. The ability to adjust pigmentation level rapidly may be especially useful in situations where risk assessment is difficult due to strong seasonal and spatial variation in risk variables, such as in Arctic regions. With progressive thinning of the ozone layer, the ability of some but not other organisms to adjust protection against UV radiation may lead to counter-intuitive, large-scale alterations in freshwater food webs.  (+info)

Microbiological analysis of tube-well water in a rural area of Bangladesh. (8/255)

Five tube-wells in Matlab, Bangladesh, were selected for analysis of selected biophysicochemical parameters. The results showed that all tube-well water samples contained zooplankton and bacteria. Results for some of the parameters were outside the accepted limits recommended by the World Health Organization for drinking water. It is concluded that water from tube-wells should be treated if used as drinking water.  (+info)

We analyzed a large data set of laboratory experiments to examine the effects of cyanobacteria containing or lacking intracellular toxic metabolites and of different morphology on zooplankton population growth rates across multiple genera and species of cladocerans, rotifers and cyanobacteria. Twenty-one of the 29 zooplankton species maintained positive growth rates when fed a diet containing cyanobacteria even though cyanobacteria were a poor food source for half of the zooplankton species tested relative to a diet containing only green algae and/or flagellates. Differences among zooplankton species could not be explained by grazer species body lengths, even when experiments were restricted to those that used only filamentous cyanobacteria. Single-celled cyanobacteria were more detrimental to a larger number of zooplankton species compared to filamentous or chroococcoid colonial cyanobacteria. We also found no clear effect of putative cyanobacterial toxins on the growth of seven zooplankton ...
p,Zooplankton play an important role in the trophic dynamics of coral reef ecosystems. Detailed vertical and temporal distribution and biomass of zooplankton were evaluated at four heights off the bottom and at six times throughout the diel cycle over a coral reef in the Florida Keys (USA). Zooplankton abundance averaged 4396 +/- 1949 SD individuals m(-3), but temporal and spatial distributions varied for individual zooplankton taxa by time of day and by height off the bottom. Copepods comprised 93-96% of the abundance in the samples. Taxon-based zooplankton CHN values paired with abundance data were used to estimate biomass. Average daily biomass ranged from 3.1 to 21.4 mg C m(-3) and differed by both height off the bottom and by time of day. While copepods were the numerically dominant organisms, their contribution to biomass was only 35% of the total zooplankton biomass. Our findings provide important support for the new emerging paradigm of how zooplankton are distributed over ...
Desert springs, which harbor diverse and endemic invertebrate assemblages, are often used as refuge habitats for protected fish species. Additionally, many of these springs have been colonized by invasive fish species. However, the potential impacts of recently established fish populations on invertebrate communities in desert springs have been relatively unexplored. We conducted a mesocosm experiment to assess the impact of both protected and invasive fish on community structure of spring-dwelling invertebrates focusing on zooplankton. Experimental populations of spring zooplankton communities were established and randomly assigned to one of three treatments, (1) invasive western mosquitofish (Gambusia affinis); (2) endangered Mohave tui chub (Siphateles bicolor mohavensis); and (3) fishless control. Final populations of zooplankton and fish were sampled, sorted, identified and counted. The treatment differences of zooplankton communities were analyzed by comparing the densities of six major
A literature synthesis of phytoplankton growth (μ) and grazing (m) rate estimates from dilution experiments reveals that microzooplankton account for most phytoplankton mortality in the oceans, averaging 60-75% of daily phytoplankton production (PP) across a spectrum of open-ocean and coastal systems. For reasonable estimates of gross growth efficiency (GGE=30-40%), such impacts imply that secondary production rates of microzooplankton (MP2°) are typically in the range 21-34% of PP. However, multiple trophic transfers within the microbial community can further enhance total microzooplankton production by an additional third to a half (MPtot=28-55% of PP). These estimates are 2-5 times typical values for bacterial production (10-15% of PP). Thus, in aggregate and on average, microzooplankton consume substantially more (6-7 times) production from phytoplankton than from heterotrophic bacteria. High grazing impacts and relatively high GGEs are consistent with population growth rates for ...
Discussion Our study suggests that local and regional processes interact to produce patterns of species composition and diversity of zooplankton in Kasseb Reservoir. In this system of highly connected reservoirs, Kasseb Reservoir provides the water for the Ghdir El Goulla Reservoir (Sellami et al., 2009). Connections between reservoirs can have positive and negative impacts on zooplankton communities. The Kasseb Reservoir has low diversity (8 zooplankton species). The results of this study suggest that this system is structured according to the species-sorting paradigm (Leibold et al., 2004). Connectivity can promote high community diversity by providing new species from the regional pool, but can also limit local diversity by washing out species, setting up local communities for competitive exclusion, and otherwise providing a disturbance that can offset equilibrium conditions (Cottenie and DeMeester, 2005).. The highest zooplankton densities were found in early September at a depth of 5 m ...
Zooplankton abundance and species diversity in two lakes with different trophic states (Corrientes, Argentina) Abundância e diversidade específica do zooplâncton em dois lagos com estados tróficos diferentes (Corrientes, Argentina) Frutos, SM.1, 2, Poi de Neiff1, 2, ASG. and Neiff, JJ.1 Centro de Ecología Aplicada del Litoral - CONICET, CP 3400, C.C. 291, Corrientes, Argentina e-mail: [email protected]; [email protected] 2 Departamento de Biología, FACENA, Universidad Nacional del Nordeste e-mail: [email protected] Abstract: Aim: In this study, we compare the composition and abundance of zooplankton community between a lake affected by the domestic sewage and in an unaffected lake. We also identified the environmental variables associated with the variation in the most abundant populations and the rotifer species that are indicators of trophic state; Methods: Seventeen zooplankton samples (50 L per sample) were filtered through a plankton net (53 µm) in the limnetic zone of each site. Non ...
Quantitative seasonal studies on gelatinous zooplankton in Norwegian fjords are scarce. We recorded the quantitative composition of the gelatinous zooplankton community in Korsfjord and Fanafjord during 1 yr. Thirty-six species or genera of hydromedusae, 7 species of siphonophores, 4 species of ctenophores and 2 species of scyphomedusae were recorded. Aglantha digitale was numerically dominant in both fjords. A separate video-profiling study on the vertical distribution of fully grown specimens of this species was made in Korsfjord and the adjacent Bjørnafjord. Our data suggest 2 A. digitale generations yr-1, with relatively low importance of the latter generation. The overwintering strategy includes autumn growth to full size and distribution at intermediate depth, mainly between 200 and 300 m. Siphonophores were prominent in the more oceanic Korsfjord, while Fanafjord was characterized by meroplanktonic hydromedusae. More species were recorded from Korsfjord, which may be partly attributed to ...
The abundance and composition of zooplankton down to 3000 m depth was studied in the subtropical and tropical latitudes across the Atlantic, Pacific and Indian Oceans (35 °N–40 °S). Samples were collected from December 2010 to June 2011 during the Malaspina Circumnavigation Expedition. Usually, low abundances were observed with the highest values found in the North Pacific Ocean, Benguela, and off Mauritania, and the lowest in the South Pacific Ocean. No significant differences in abundance and zooplankton composition were found among oceans, with depth being consistently the most important factor affecting their distribution. Each depth strata were inhabited by distinct copepod assemblages, which significantly differed among the strata. The contribution of copepods to the zooplankton community increased with the depth although, as expected, their abundance strongly decreased. Among the copepods, 265 species were identified but 85% were rare and contributed less than 1% in abundance.
Metabolic and stoichiometric theories of ecology have provided broad complementary principles to understand ecosystem processes across different levels of biological organization. We tested several of their cornerstone hypotheses by measuring the nucleic acid (NA) and phosphorus (P) content of crustacean zooplankton species in 22 high mountain lakes (Sierra Nevada and the Pyrenees mountains, Spain). The P-allocation hypothesis (PAH) proposes that the genome size is smaller in cladocerans than in copepods as a result of selection for fast growth towards P-allocation from DNA to RNA under P limitation. Consistent with the PAH, the RNA: DNA ratio was , 8-fold higher in cladocerans than in copepods, although fast-growth cladocerans did not always exhibit higher RNA and lower DNA contents in comparison to slow-growth copepods. We also showed strong associations among growth rate, RNA, and total P content supporting the growth rate hypothesis, which predicts that fast-growing organisms have high P ...
Marine zooplankton form a significant part of the marine ecosystem since they are relatively low on the food chain and they exist in vast quantities. However, little is known of their behavior, how they feed, how they interact or their swimming patterns. To explore some of these issues a three-dimensional imaging sonar was developed to track the movements of these zooplankton in their native environment. The tracking problem requires a high frequency sonar with a fast frame update rate and reasonably high resolutions in three dimensions. It also requires a small array to minimize the proximity effects of the transducer package on the zooplankton behavior, to allow mounting of the transducer array on small remotely operated submersible vehicles and to reduce the cost of the sonar. This led to an array architecture which resolves the target volume of interest into a three-dimensional array of volumetric units that are digitized and stored in computer memory. This digitized array of numbers is then ...
Zooplankton, fish and other marine organisms move between the surface of the oceans and deeper waters every day. Zooplankton typically reside at depths during daytime to avoid predation from visual organisms. At night, zooplankton migrate to the surface to feed on small phytoplankton, and fish and other organisms feeding on zooplankton follow their prey to the surface. This movement is called diel vertical migration and is believed to be the largest natural daily movement of biomass of the planet, only potentially exceeded by human commuters.. During his PhD study at DTU Aqua, Jérôme Pinti has developed a method that can improve our understanding of the optimal vertical migration patterns. The method relies on game theory, where organisms are seen as players trying to optimize their fitness-a measure of how well they are doing-considering the behaviour of all other organisms.. Jérôme Pinti has used the method to model, among others, a whole pelagic community-from mesozooplankton to ...
About my research:. A project in the Daly Zooplankton Ecology Lab focuses on identifying changes to zooplankton ecology relative to the Deepwater Horizon (DWH) oil spill. I will be comparing historic pre-spill samples collected by the National Oceanic and Atmospheric Administration to post-spill samples collected by researchers here at USF. My research will establish a baseline of the natural spatial, seasonal, and interannual variation in zooplankton community structure prior to the DWH oil spill and subsequently compare it with post DWH zooplankton data. To process samples, our lab will be using a revolutionary piece of equipment in the zooplankton research field: Hydroptic Zooscan digital imaging system. The Zooscan overcomes traditionally time-consuming and difficult taxonomic techniques that have previously limited large-scale zooplankton analyses. I hypothesize that the DWH oil spill resulted in a significant shift in zooplankton abundance, distribution, and composition in the northeast ...
Station ALOHA is located in the North Pacific Subtropical Gyre 60 miles off of Oahu. Subtropical gyres are known to have a high diversity of zooplankton because of the low nutrients available in this region. High-nutrient sub-polar gyres, contrast with sub-tropical regions, as their zooplankton diversity is low due to increased biomass and intense competition. However, recovery of the MOCNESS and ring nets at Station ALOHA have provided a wide variety of zooplankton for our student scientists on board. We have been working hard all day to obtain information on the abundance and types of zooplankton found, requiring many hours of sorting through the cod ends of the nets (baskets that collect the seawater and zooplankton). Once collected, scientists must filter out the zooplankton by size and identify the species using microscopes. Some of the desired zooplankton species like nauplii (baby copepods) are so tiny that they have to be sorted with tweezers under a microscope. This is a tedious and ...
Al-Mutairi, H. and Landry, M. R.: Active export of carbon and nitrogen at station ALOHA by diel migrant zooplankton, Deep-Sea Res. Pt. II, 48, 2083-2103, https://doi.org/10.1016/S0967-0645(00)00174-0, 2001. Andersen, V., Devey, C., Gubanova, A., Picheral, M., Melnikov, V., Tsarin, S., and Prieur, L.: Vertical distributions of zooplankton across the Almeria-Oran frontal zone (Mediterranean Sea), J. Plankton Res., 26, 275-293, https://doi.org/10.1093/plankt/fbh036, 2004. Antezana, T.: Vertical distribution and diel migration of Euphausia mucronata in the oxygen minimum layer of the Humboldt Current, Oceanogr. East. Pacific II, 2, 13-28, 2002. Antezana, T.: Species-specific patterns of diel migration into the Oxygen Minimum Zone by euphausiids in the Humboldt Current Ecosystem, Prog. Oceanogr., 83, 228-236, https://doi.org/10.1016/j.pocean.2009.07.039, 2009. Antezana, T.: Euphausia mucronata: A keystone herbivore and prey of the Humboldt Current System, Deep-Sea Res. Pt. II, 57, 652-662, ...
Ecology, Evolutionary Biology and Behavior Program // Department of Fisheries and Wildlife. Topics: Community Ecology, Trophic interactions, Non-consumptive predator effects, Animal Behavior, Phenotypic Plasticity. We seek applicants who are interested in studying community and aquatic ecology starting in Fall 2012. We currently have funding for students to join a research effort examining non-consumptive effects (also called trait-mediated effects) of predators on zooplankton communities in Michigan ponds. Potential projects include examining predator-induced effects on zooplankton phenotype (including behavior) and how these induced effects influence zooplankton population and community dynamics. While particular PhD projects are flexible within the scope of the overall project, the positions could include integration of field, laboratory and ecological modeling. One of the positions will be given to a student interested in their research including ecological theory /modeling. Collaborators ...
Burkill, Peter (2004): Biomass and abundance of microzooplankton and nanoflagellates at bottle station A6/1. PANGAEA, https://doi.org/10.1594/PANGAEA.135385
Our research interests are in zooplankton ecology and physiology, coastal and deep-sea food webs, nutrient cycling, and marine detritus or marine snow. Much of our current focus is on how zooplankton community structure affects flux of organic material and cycling of nutrients in the sea.. Our laboratory is involved in a number of projects with this theme, including the. ...
The report describes results of studies conducted to obtain data to assess the effects of waste disposal on the marine environment of the New York Bight. The report concerns zooplankton studies including distribution, seasonal occurrence and vertical migration of zooplankton populations in the dumping grounds. (Author)(*MARINE BIOLOGY
We developed new perspectives to identify important questions and to propose approaches for future research on marine food web lipids. They were related to (i) structure and function of lipids, (ii) lipid changes during critical life phases, (iii) trophic marker lipids, and (iv) potential impact of climate change. The first addresses the role of lipids in membranes, storage lipids, and buoyancy with the following key question: How are the properties of membranes and deposits affected by the various types of lipids? The second deals with the importance of various types of lipids during reproduction, development, and resting phases and addresses the role of the different storage lipids during growth and dormancy. The third relates to trophic marker lipids, which are an important tool to follow lipid and energy transfer through the food web. The central question is how can fatty acids be used to identify and quantify food web relationships? With the fourth, hypotheses are presented on effects of ...
To evaluate the effects of different anthropogenic activities on zooplankton and the pelagic ecosystem, we conducted seasonal cruises in 2010 to assess spatial heterogeneity among the mesozooplankton communities of Xiangshan Bay, a subtropical semi-enclosed bay in China. The evaluation included five different areas: a kelp farm, an oyster farm, a fish farm, the thermal discharge area of a power plant, and an artificial reef, and we aimed to identify whether anthropogenic activities dominated spatial variation in the mesozooplankton communities. The results demonstrated clear spatial heterogeneity among the mesozooplankton communities of the studied areas, dominantly driven by natural hydrographic properties, except in the area near the thermal discharge outlet of the power station. In the outlet area, thermal shock caused by the discharge influenced the mesozooplankton community by decreasing abundance and biomass throughout the four seasons, even causing a shift in the dominant species near the ...
Ecological consequences of global warming include shifts of species ranges toward higher altitudes and latitudes as well as temporal shifts in phenology and life-cycle events. Evidence is accumulating that increasing temperature is also linked to reduced body size of ectotherms. While temperature can act directly on body size, it may also act indirectly by affecting the timing of life-cycle events and the resulting population age and size structure, especially in seasonal environments. Population structure may, in turn, be influenced by temperature-driven changes in resource availability. In a field mesocosm experiment, we investigated how water temperature and mixed surface layer depth (a temperature-dependent determinant of light availability to phytoplankton) affected population dynamics, population age and size structure, and individual size at stage (size at first reproduction) of Daphnia hyalina during and after a phytoplankton spring bloom. Mixed layer depth was inversely related to the ...
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Detection of population genetic structure of zooplankton at medium-to-small spatial scales in the absence of physical barriers has remained challenging and controversial. The large population sizes and high rates of gene flow characteristic of zooplankton have made resolution of geographical differentiation very difficult, especially when using few genetic markers and assuming equilibrium conditions. Next-generation sequencing now allows simultaneous sampling of hundreds to thousands of genetic markers; new analytical approaches allow studies under nonequilibrium conditions and directional migration. Samples of the North Atlantic Ocean planktonic copepod, Centropages typicus, were analysed using restriction site-associated DNA (RAD) sequencing on a PROTON platform. Although prior studies revealed no genetic differentiation of populations across the geographical range of the species, analysis of RAD tags showed significant structure across the North Atlantic Ocean. We also compared the likelihood ...
A concentrated blend of marine zooplankton designed to provide the essential fatty acids, proteins, vitamins, amino acids, & natural carotenoids needed for coral growth. Provides a more bioavailable source of pigmentation.
Current fauna, biomass and distribution on zooplankton in the upper water of the Yinluan Project are investigated and studied. A biodiversity Index analysis is performed. Based on the present study and referring to the historic investigated data and the information from the studies on allied domestic water bodies, an ecological and environmental status of the investigated area is assessed and evaluated. The research result suggests that the water quality of the area can be delimited to poor to mesotrophic type. But more attention should be paid as the eutrophication tendency caused by box aquaculture in Panjiakou and Daheiting Reservoirs.
Using common garden experiments and a comparative field study, we have shown that the strong effects of life-history differences among alewife populations on zooplankton communities have propagated across the food web to influence the phenotype and fitness of a competing species. We found that bluegill from different lake types differed in (i) growth rates when exposed to small- or large-bodied prey, (ii) prey size selectivity and (iii) gill raker morphology. Our results revealed clear divergence in foraging traits between bluegill from landlocked and no-alewife lakes, but only weak divergence in bluegill between anadromous and no-alewife lakes. Consistent predation by landlocked alewife shapes the zooplankton community [7] such that it produces strong selection for traits that increase foraging performance on small-bodied zooplankton [16]. Consequently, we found bluegill from replicated landlocked lakes to be better adapted to feeding on small-bodied prey; they were less selective for large ...
Inhabits reef channels or along slopes that are subject to strong currents (Ref. 48637). Occur in current-swept seaward coral reefs. Usually form aggregations and feed on zooplankton as well as sponges (Ref. 9770). Juveniles associated with isolated patches of rubble or crevices with proper-sized shelter holes (Ref. 1602). Oviparous (Ref. 205). Form large schools to feed on zooplankton (Ref. 48637). Also taken by drive-in nets (Ref. 9770). Marketed fresh or dried-salted. Minimum depth reported taken from Ref. 30874. Popular aquarium fish (Ref. 37816). ...
At the Institute of Oceanography and Fisheries, planktonology research has a long tradition, dating since the very beginnings of the Institute activities. Working in the lab combines research in ecology and phytoplankton and zooplankton taxology, and researching primary production processes. Taxonomy research is mostly focused on microzooplankton, mezozooplankton and microphytoplankton, while in the ecological research most of the attention is on the research of phytoplankton and zooplankton community changes created under the influence of anthropogenic activities and climate changes. In this research of great help is long-term data (phytoplankton, zooplankton, primary production, chlorophyll / a /), which represent a special value of this laboratory and the Institute itself.. ...
Lakes are important global ecosystems and many of them are nutrient-poor (unproductive). Especially in northern boreal latitudes, lakes may be heavily subsidized by terrestrial organic material (t-OM) from peat layers in the catchment. Thus, in addition to heterotrophic bacteria and phytoplankton, zooplankton may also use the particulate fraction of peat layer t-OM (t-POM) as a potential food source in those systems. Inputs of t-OM in northern latitudes are anticipated to increase in the future due to increasing precipitation and temperature. As t-OM is a good substrate for bacterial growth and as bacteria can often outcompete phytoplankton for inorganic nutrients, the proportions of heterotrophic bacteria and phytoplankton are expected to change in unproductive lakes. This may have pronounced impacts on zooplankton population dynamics.. The aim of my thesis was to investigate how changes in food quality and quantity will affect metazoan zooplankton performance in unproductive lakes. Three ...
The benthic macroinvertebrates and the zooplankton of the shallow (,1.5 m deep) sandy middle regions of the Peel-Harvey Estuary and of the nearby Swan Estuary were sampled seasonally between the winters of 1986 and 1987. Measurements were also taken of the environmental variables in the benthos and in the water column.. In comparison with the Swan Estuary, the Peel-Harvey Estuary is highly nutrient enriched and is not as well flushed. As a consequence, the water in the basins of the Peel-Harvey experience large seasonal blooms of the blue-green alga Nodularia spumigena and massive growths of benthic and drifting green algae. The first led to marked seasonal declines in redox values, secchi depths and nocturnal dissolved oxygen and, together with the decomposition of the macroalgae, resulted in a marked increase in particulate organic matter in the sediments.. The following comparisons between the benthic invertebrate fauna in the Peel- Harvey with that of the Swan Estuary are consistent with the ...
Abstract. In a changing ocean there is a critical need to understand global biogeochemical cycling, particularly regarding carbon. We have made strides in understanding upper ocean dynamics, but the deep ocean interior (, 1000 m) is still largely unknown, despite representing the overwhelming majority of Earths biosphere. Here we present a method for estimating deep-pelagic zooplankton biomass on an ocean-basin scale. We have made several new discoveries about the Atlantic, which likely apply to the world ocean. First, multivariate analysis showed that depth and Chl were the basic factors affecting the wet biomass of the main plankton groups. Wet biomass of all major groups was significantly correlated with Chl. Second, zooplankton biomass in the upper bathypelagic domain is higher than expected. Third, the majority of this biomass comprises macroplanktonic shrimps, which have been historically underestimated. These findings, coupled with recent findings of increased global deep-pelagic fish ...
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Friday, January 18, 2013, 05:20 (GMT + 9) A new study provides unprecedented evidence of viral infections in copepods, or tiny marine crustaceans. Viruses could account for part of the up to 35 per cent of the zooplanktons mortalities, whose causes are currently unknown but suspected to be harmful algae, environmental stressors, parasites and diseases. Researchers used genomic techniques to support the hypothesis that viral infections are a major cause of copepod deaths.. The study was published in the Proceedings of the National Academies of Science.. This is the first evidence of viruses in marine zooplankton, said Ian Hewson, Cornell University assistant professor of microbiology and senior author of the paper. Copepods are critical in oceanic food webs and ocean carbon cycling, which helps regulate the Earths climate. They also consume most of the oceans phytoplankton, which seize about half of the carbon dioxide pulled from the atmosphere and fixed in plant cells. As copepods defecate ...
Positive associations between temperature and recruitment success of cod, haddock and herring in the area studied are well documented, but the causal basis has remained elusive (Ottersen et al. 2004). Disentangling the roles of temperature and zooplankton has been particularly difficult because the temperature index used in most studies (TKOLA) has been considered as an indicator of both temperature and zooplankton availability in the study system (Ottersen & Sundby 1995; Ottersen & Loeng 2000), and because multi-annual zooplankton data have largely been lacking (but see Ellertsen et al. 1989). Several non-exclusive mechanisms have been suggested to explain the temperature-recruitment associations, including physiological effects of temperature on growth (Ottersen & Loeng 2000), increased on-shelf advection of copepods in warm years (Sundby 2000) and a better spatio-temporal match between the fish larvae and their zooplanktonic food during warm years (Ellertsen et al. 1989; Fossum 1996). Our ...
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Interactions between organisms and complex flow fields are of significant consequence to many ecological processes (e.g. predator-prey interactions, swimming behavior, spatial dispersion and distribution, diel migration). Thus, turbulence-organism interactions have received much recent attention (e.g. Prairie et al., 2012; Guasto et al., 2012; Durham et al., 2013; Jumars et al., 2009; Yamazaki and Squires, 1996). Quantifying turbulent flow fields with high spatial and temporal resolution, and relating them to the behavior and distributions of organisms, e.g. zooplankton, is critical for advancing our understanding. However, obtaining such data is challenging. First, both turbulent flows and planktonic motion are unsteady and three-dimensional, requiring a time-resolved, volumetric measurement system; second, plankton can propel themselves relative to the surrounding fluid leading to local differences in fluid and organism velocity; and third, many planktonic organisms have ...
87000 by 2015, among which over 4,800 samples have been analyzed at species level. Although no online access is available, those data are recorded following the international standard (Darwin Core) format. ​. Using those species level data, we have studied how ecosystem structures in the western North Pacific changed responding to climatic forcing, in particular, the North Pacific Decadal Oscillation (PDO). The scientific outcome includes phenological change and latitudinal shift of dominant copepods, Neocalanus species, which were driven by the decadal warm-cool cycle related to PDO. As mentioned above, one of the recent trends in the retrospective study is basin to global scale synthesis of long-term ecosystem changes. We have conducted collaborative studies with international counterparts, and participated in some international projects aiming for global comparison of long-term zooplankton variation. Those collaborative researches revealed, for example, the seesaw pattern in its decadal ...
University of British Columbia researchers have identified a small virus that attacks another virus more than 100 times its own size, rescuing the infected zooplankton from certain death. The discovery may provide clues to the evolutionary origin of some jumping genes found in other organisms. The study, by UBC marine microbiologist Dr. Curtis Suttle and Ph.D. student Matthias Fischer, was published online March 3, 2011, in Science Express. It describes the marine virus Mavirus and its interaction with marine zooplankton Cafeteria roenbergenesis and CroV, the worlds largest marine virus. Its a microbial version of the David and Goliah story where, after infecting Cafeteria roenbergeneis, Mavirus protects it against infection by CroV, while ensuring its own survival, said Dr. Suttle. Viruses rely on host cells to replicate; in the case of Mavirus, its host is another virus, making it only the second known virophage. It needs CroV to replicate, and in the process suppresses the propagation of ...
Kelly Benoit-Bird is a marine biologist who uses sophisticated acoustic engineering techniques to explore the previously invisible behavior of ocean creatures at scales ranging from swarms distributed over many cubic kilometers to individual predators. The food web of ocean surface waters begins with microscopic creatures that serve as the source of food for tiny organisms (zooplankton) just large enough to generate an acoustic signature. Although zooplankton drift in response to ocean currents, Benoit-Bird has shown that they use their modest locomotive capacity to form swarms with distinct three-dimensional structures that change with feeding conditions. Using multi-frequency acoustic backscattering, she has been able to reconstruct the feeding patterns of swimming predators of zooplankton (known as nekton) as they first pass downward through a layer of zooplankton, then reverse course and pass through upward. Having precise data about the horizontal and vertical distribution of oceanic food ...
Biomass, proximate composition, organic carbon and calorie content of assorted zooplankton from the surface waters were studied. Day and night stations revealed significant difference in biomass (displacement volume, dry wt and organic carbon) whereas at coastal and oceanic stations irrespective of day and night the difference was significant only in dry wt values. Protein and organic carbon content peaked at 14-degrees-16-degrees-N. Average calorific content was 4.05 kcal.g-1 dry wt. High lipid content at 12-degrees-14-degrees-N correlated with maximum chl-a ...
The effects of increasing fishing pressure in combination with temperature increases in the Nordic and Barents Seas have been evaluated using an end-to-end model for the area forced by a downscaled RCP 4.5 climate scenario. The scenarios that have been applied have used four different fractions of fisheries mortality at maximum sustainable yield (Fmsy); 0.6, 0.8, 1.0 and 1.1 × Fmsy. As it is highly likely that more ecosystem components will be harvested in the future, the four scenarios have been repeated with fishing on a larger number of ecosystem components, including harvesting of lower trophic levels (mesozooplankton and mesopelagic fish). The zooplankton biomass had an increasing trend, regardless of the increase in fishing pressure on their predators. However, when introducing harvest on the lower trophic levels, this increase was no longer evident. When harvesting more components, the negative response in biomass of pelagic and demersal fish to increasing harvest became more prominent,
Zooplankton dormancy forms in two environments of the upper Paraná River floodplain (Brazil) Formas de dormência do zooplâncton em dois ambientes da planície de inundação do alto Rio Paraná (Brasil) Palazzo,
Sigma-Aldrich offers abstracts and full-text articles by [Peter J Lavrentyev, Gayantonia Franzè, James J Pierson, Diane K Stoecker].
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There are a lot of factors that influence the composition and abundance of zooplankton communities which are namely physical, chemical and biological. Factors recognised mostly are temperature, pH, and availability of food, these act simultaneously causing it to interact to different degrees resulting the structure of zooplanktons to be in a variety. Temperature controls the reproductive rate, population size and metabolism of the species (Edmondson, 1965) while in tropical regions, precipitation and wind are the physical factors which are significant in affecting the composition of zooplanktons (Matsumara-Tundinsi & Noguiera, 1996). Predation by fish may affect its structure as well in accordance with the fish feeding mode: selective feeders, differential capture of organisms, tendency to eliminate large species which are replaced by less vulnerable forms (Brooks & Dodson, 1965). The diversity of species may be lesser sometimes but single species may be superior over other groups in terms of ...
Some marine zooplankton are only temporary residents of the plankton, representing the larval stages of marine invertebrates such as corals, worms, snails, clams and crabs. After a period in the open water, these larvae must settle to the ocean floor where they will live out their adult lives. It is important that larvae are able to find the best place in which to settle, as this will affect their future success and survival.. Many marine larvae rely on a chemosensory organ in the head, known as the apical organ, to detect chemical cues from their environment that are indicative of favourable settlement sites. How environmental cues are interpreted by the apical organ to generate behavioural responses during settlement is not yet understood.. Studying Platynereis larvae, we have identified a neuropeptide, myoinhibitory peptide (MIP), as an apical organ signaling molecule that triggers larval settlement. In lab culture, 2 day Platynereis larvae actively swim in a water column. Exposure of the ...
SO 5/82 Period:- 1982-9-25 to 1982-10-27. Region: Australian North West Shelf. Ship :- Soela [details]. Description:- Soela cruise SO 5/82 was undertaken for a biological and hydrological sampling programme in the North West Shelf. Leg 1 cruise objectives were to collect biological information on demersal fish; to determine zooplankton abundances of alternate trawl sites and collect larval fish; to collect benthic samples with grab and epibenthic sled and to develop a method of otbaining healthy fish for tagging. Leg 2 cruise objectives were to collect hydrology and particulate samples; to collect larval fish and zooplankton samples and to collect biological information on squid, lethrinids, carangids and sharks ...
and search WWM with the term coral allelopathy, and read particularly re Euphylliids in this regard. Bob Fenner,. Colt Coral Feeding 11/7/07 Hi, ,Hi Jason, I recently acquired a Colt Coral from my LFS. Ive been looking all over the net for feeding info and am confused as to what and how often it should be fed. Im supplementing weekly with iodine. ,Strontium should be added also.,,,Mmmm. Not necessary IMO. RMF,, My LFS recommended that I feed medium sized zooplankton once a week. They recommended a bottled zooplankton product by Brightwell Aquatics that is not refrigerated. Is this the best way to go? Is phytoplankton a preferred food over zooplankton for this species? Any help would be appreciated. Love the site. ,Jason, since the Colt Coral (Cladiella sp.) is photosynthetic, no feeding is actually required as long as the light intensity is suitable. Some feel it is beneficial to do occasional feedings. My choice would be Marine Plankton With Cyclopeeze, made by Liquid Life. Is what I use on ...
The diel vertical dynamics of gelatinous zooplankton in physically stratified conditions over the 100-m isobath (~110 km offshore) in the South Brazilian Bight (26°45S; 47°33W) and the relationship to hydrography and food availability were analyzed by sampling every six hours over two consecutive days. Zooplankton samples were taken in three depth strata, following the vertical structure of the water column, with cold waters between 17 and 13.1°C, influenced by the South Atlantic Central Water (SACW) in the lower layer (|70 m); warm (|20°C) Tropical Water in the upper 40 m; and an intermediate thermocline with a deep chlorophyll-a maximum layer (0.3-0.6 mg m-3). Two distinct general patterns were observed, emphasizing the role of (i) physical and (ii) biological processes: (i) a strong influence of the vertical stratification, with most zooplankton absent or little abundant in the lower layer. The influence of the cold SACW on the bottom layer apparently restricted the vertical occupation of most
The environmental drivers of zooplankton variability are poorly explored for the central subtropical Pacific, where a direct bottom-up food-web connection is suggested by increasing trends in primary production and mesozooplankton biomass at station ALOHA (A Long-term Oligotrophic Habitat Assessment) over the past 20 years (1994-2013). Here we use generalized additive models (GAMs) to investigate how these trends relate to the major modes of North Pacific climate variability. A GAM based on monthly mean data explains 43% of the temporal variability in mesozooplankton biomass with significant influences from primary productivity (PP), sea surface temperature (SST), North Pacific Gyre Oscillation (NPGO), and El Nino. This result mainly reflects the seasonal plankton cycle at station ALOHA, in which increasing light and SST lead to enhanced nitrogen fixation, productivity, and zooplankton biomass during summertime. Based on annual mean data, GAMs for two variables suggest that PP and 3-4 year ...
The light intensity and spectral sensitivities of the calanoid copepod Acartia tonsa Dana were determined by measuring phototactic responses. Adult females
Under the influence of the Western Iberian upwelling system, the Iberian Atlantic coast holds important hatcheries and recruitment areas for Octopus vulgaris. Recently identified as an octopus hatchery, the Ría de Vigo harbours an important mesozooplankton community that supports O. vulgaris paralarvae during the first days of their planktonic stage. This study represents a preliminary approach to determine the nutritional link between wild O. vulgaris hatchlings, paralarvae and their zooplankton prey in the Ría de Vigo, by analysing their lipid class content and fatty acid profiles. The results show that octopus hatchlings are richer in structural lipids as phospholipids and cholesterol, while the zooplankton is richer in reserve lipids like triacylglycerol and waxes. Zooplankton samples are also particularly rich in C18:1n9 and 22:6n3 (DHA), that seem to be successfully incorporated by O. vulgaris paralarvae thus resulting in a distinct fatty acid profile to that of the hatchlings. On the other hand
Through their physiological processes, mesozooplankton can contribute significantly to the marine biogeochemical cycling of carbon and nitrogen. However some of these processes have been poorly parameterised in ecosystem models. Respiration in particular has been measured in terms of basal respiration which is related to temperature but independent of other metabolic activities such as feeding. This project will investigate the response of copepod physiology to food quality and temperature. A range of food quality (phytoplankton N:P ratio) will be achieved through sampling a latitudinal transect in the Atlantic Ocean (Atlantic Meridional Transect cruise, October 2010), a coastal time series station 20 km south of Plymouth, UK (spring, summer, autumn, winter sampling 2010-2011), and maintaining continuous cultures of selected species of phytoplankton under N and P limitation. Copepod (Calanus spp. and Oithona spp.) feeding rate, egg production, excretion and respiration rate will be determined across
ABSTRACT: Concentrations of several metals (e.g., Cu and Zn) in barnacles are probably the highest recorded among any marine animals. Physiological processes responsible for such high metal concentrations remain less well quantified. In this study we measured the assimilation efficiency (AE) of Cd, Cr, and Zn in a subtidal barnacle Balanus trigonus, an important fouling organism in the Indo-Pacific region. The bioavailabilities of metals from different phytoplankton diets and zooplankton diet (the copepod Paracalanus aculeatus) were compared. The AEs in B. trigonus feeding on different phytoplankton (diatoms, a dinoflagellate, and a prasinophyte) were in the range 41 to 62% for Cd, 3 to 10% for Cr, and 54 to 85% for Zn. The AEs of Cd and Zn were relatively higher in barnacles feeding on zooplankton diets, ranging from 77 to 78% for Cd and 86 to 88% for Zn. For different phytoplankton diets, we showed that the AEs of Cd and Zn were related to metal distribution in the phytoplankton cytoplasm and ...
This study aimed to investigate functional responses of natural marine planktonic communities to stress from the antifouling compound zinc pyrithione (ZPT). Isotope labelling techniques (14C) were applied to study bacterial incorporation of leucine, photosynthetic activity of phytoplankton and grazing of labelled prey by zooplankton communities for 6 days after exposures to nominal concentrations of 0, 5, 25, 50 nM ZPT in a mesocosm experiment in Isefjord, Denmark. Significant direct effects were visible on chlorophyll α concentrations, which decreased in all exposed communities, to between 48 and 36% of control concentrations on Day 3, 1 day after the last exposure. Phytoplankton activities were also significantly affected on Day 3 with activities between 9 and 26% of control levels, as was zooplankton activities in the 25 and 50 nM exposures. In the 50 nM exposure the total community zooplankton activity was reduced to 25 ± 4%, and per individual to 46 ± 11% of control levels. Bacterial communities
Environmental factors have a varied impact on the development of juvenile and adult Cladocera, depending on their different physiological conditions and body size. The values of these factors alter spatially and temporarily, thus implying that they play a role in the spatial distribution of the pre-reproductive and potentially reproductive stages of cladocerans. The aim of the study was to determine seasonal and spatial variations in the distribution of juvenile and adult individuals of limnetic Cladocera in relation to selected physicochemical factors (temperature, conductivity, pH, concentration of dissolved oxygen, total organic carbon, total suspended solids) and fish predation pressure (measured by Chessons coefficient λ) in deep Lake Piaseczno (eastern Poland). Adult Cladocera displayed spatial distribution related to fish predation pressure. The species selectively eaten, B. coregoni and D. longispina, and non-selectively eaten, D. cucullata, selected the pelagic zone to exist, whereas ...
The habitat of an organism is the place where it lives, whereas the ecological niche, a term coined by Elton in 1927, can br termed as the position or status of an organism within its community and ecosystem resulting from the organisms structural and functional adaptations. By analogy, it is often said that habitat is the organisms address and the niche is its profession.. The concept of ecological niche is of much interest to the aquaculturist, for it is around it that the practice of polyculture of fishes is centred. The wellknown examples are the polyculture of Chinese and Indian carps including in some cases a predator species also. Here it is basically the complete exploitation of the feeding niches in the water body as examplified by the mixing of surface feeders, some depending predominantely on phytoplankton (silver carp), some on zooplankton (Catla), columinn feeders (rohu), bottom feeders (common carp and mrigal), feeders of aquatic (grass carp) and predators (snakeheads). ...
This data package contains demersal zooplankton abundance and taxonomic composition measured at 3 stations on the north shore of Moorea, French Polynesia: Forereef, Backreef and Fringing Reef from 2005 to 2010. Demersal zooplankton emerging from sand or rubble substrates on the reef during the night were captured in 8 inverted funnel traps placed on the substrate in the late afternoon and retrieved the following morning. Traps were made of 200 μm mesh netting with the opening to the cod end located 18 cm above the bottom. Four traps, each covering 0.0615 m2 of substrate, were combined to obtain one sample for counting. The table reports means of 2 replicates each containing 4 combined traps. Traps placed over sand were pushed into the substrate. However, traps over rubble had numerous gaps along their bases allowing some contamination from the water column. Data are expressed as number of animals emerging per square meter of bottom.. ...
Adults inhabit a wide variety of lakes and large to medium sized rivers. Most abundant in backwaters, lower parts of slow-flowing rivers, brackish estuaries and warm and shallow lakes (Ref. 59043). Adults occur usually in still and slow-running waters where they travel in large shoals (Ref. 9696). Larvae and juveniles live in still water bodies, feeding on plankton. One to two years old juveniles move from backwaters to river to feed. In the absence of opportunity to leave backwaters, juveniles may adapt but have a slower growth and attain maturity at a smaller size. They also drift to brackishwater estuaries to forage when water level of flooded areas drops in lower reaches of large rivers. Foraging juveniles in brackish waters stay in lower parts of rivers to overwinter in freshwater (Ref. 59043). Feed on insects, particularly chironomids, small crustaceans, mollusks and plants. Larger specimens may feed on small fish. Juveniles feed on zooplankton (Ref. 30578). Able to shift to particle ...
Copepoda (2008). Acartia (Acartia) longisetosa Brady, 1914. In: Walter, T.C. & Boxshall, G. (2017). World of Copepods database. Accessed at http://www.marinespecies.org/copepoda/aphia.php?p=taxdetails&id=346028 on 2017-12- ...
Vibrio cholerae is associated with a type of crustacean called a copepod that appears naturally in many areas of the world. The copepods feed on zooplankton, which in turn feed on phytoplankton. Phytoplankton use photosynthesis to harvest energy from the sun to create their food ...
Regulatory linkage between epibiotic organisms and their host zooplankton populations is one of the least understood topics in zooplankton biology, despite the likely importance of epibionts to pelagic communities. These laboratory studies with Colacium vesiculosum , a common algal epibiont, and Daphnia pulex , one of its most common zooplankton hosts, greatly increase current understanding of zooplankton-epibiont interactions. In Chapter 1 C. vesiculosum is shown to have a resource-mediated effect on D. pulex. When D. pulex was food-limited, its fecundity and growth were increased by epibiosis because it consumed C. vesiculosum in the unattached, dispersal phase. With food in excess, D. pulex fecundity and growth were reduced by epibiosis. Chapter 2 describes the C. vesiculosum experimental system. The epibiont was cultured on D. pulex. It was obtained for experiments by killing the host, which induced C. vesiculosum dispersal. C. vesiculosum cultured on D. pulex attached to D. pulex far more ...
Regulatory linkage between epibiotic organisms and their host zooplankton populations is one of the least understood topics in zooplankton biology, despite the likely importance of epibionts to pelagic communities. These laboratory studies with Colacium vesiculosum , a common algal epibiont, and Daphnia pulex , one of its most common zooplankton hosts, greatly increase current understanding of zooplankton-epibiont interactions. In Chapter 1 C. vesiculosum is shown to have a resource-mediated effect on D. pulex. When D. pulex was food-limited, its fecundity and growth were increased by epibiosis because it consumed C. vesiculosum in the unattached, dispersal phase. With food in excess, D. pulex fecundity and growth were reduced by epibiosis. Chapter 2 describes the C. vesiculosum experimental system. The epibiont was cultured on D. pulex. It was obtained for experiments by killing the host, which induced C. vesiculosum dispersal. C. vesiculosum cultured on D. pulex attached to D. pulex far more ...
What other organisms compete with the flower hat jellyfish for resources??? your own Pins on Pinterest The species feeds on zooplankton, rather than fish. Cotylorhiza tuberculata is better known as the fried egg jellyfish or the Mediterranean jellyfish. Flower hat jellies are found off southern Japan, Argentina, and Brazil. But the transparency belies a brighter side. Scientists have created green mice that glow green when hit by blue light by inserting the GFP gene from the crystal jelly into the mice. Find (og gem) dine egne pins på Pinterest. They have three main parts: umbrella, oral arms, and stinging tentacles. Its bell can reach three feet across, its arms can be 20 feet long and its stinging tentacles 25 feet long. 16 Ocean Creatures That Live in Total Darkness, Fish Food: 13 Marine Animals Named by Hungry Biologists, Edith Widder on Mimicking the Glow of Deep Sea Fish to Discover New Species, Psychedelic Jellyfish Dominates the Deep-Sea Dance Floor, Three Quarters of Deep-Sea ...
Benthic and free swimming (Ref. 92840). A neotenic, pelagic species inhabiting inshore and estuarine waters, over sand, mud and eel-grass (Ref. 4343). Adults feed on zooplankton, especially copepods, cirripede larvae and mysids (Ref. 4343). They spawn in summer in empty bivalve shells (Ref. 35388). Probably migrate to deeper water to spawn during summer (Ref. 57814). Adults die after breeding (Ref. 4696) which does not qualify as a manifestation of semelparity but abbreviate iteroparity according to a recent study (Ref. 81039). Eggs are pear-shaped (Ref. 4696). ...
Adults are common in streams and rivers with rapid water flow, but not deep or stagnant waters. Feed on zooplankton, small crustaceans, macroscopic algae, small fish and detritus. ...
We think there has been a shift in the food web resulting in more of the productivity being consumed in the water column, Collie explained. Phytoplankton are increasingly being grazed by zooplankton, which are then eaten by planktivorous fish, rather than the phytoplankton sinking to the bottom and being consumed by bottom fish. Its a rerouting of that production from the bottom to the top.. Collie noted that the increase in the numbers of lobsters and crabs is a result of their taking advantage of the benthic habitat abandoned by the bottom-feeding fish species. Overall, the survey analysis found huge changes in the abundance of some species. Butterfish and bluefish, for instance, have increased in abundance by a factor of about 100 times while cunner has decreased by almost 1,000 times.. The analysis also found that while the total number of fish caught in each trawl increased over time, peaking in the 1990s, the size of those fish decreased. While were catching more fish now, were also ...
scenarios of increased river runoff and melting sea-ice.. We would welcome interaction with regional stakeholders with an interest in Arctic marine ecosystem functioning.. The ocean plays a central role in the storage and cycling of carbon, through the uptake of CO2 by phytoplankton during photosynthesis, and the subsequent packaging of particulate carbon in the form of dead phytoplankton cells and the faecal pellets of zooplankton which slowly sink. In addition, the activity of phytoplankton, bacteria, viruses and zooplankton produces a rich soup of dissolved organic carbon (DOC) compounds in the surrounding seawater, most of which can be rapidly respired to CO2 by bacteria, but a significant proportion of which cannot. Sunlight can also alter the chemical composition of the DOC, changing its availability to bacteria. Production of this recalcitrant DOC, which cannot be rapidly used by bacteria to grow, means that it can be stored together with the sinking particulate carbon in the deep ...
We addressed the question of bottom-up versus top-down control of marine ecosystem trophic interactions by using annual fish catch data and satellite-derived (SeaWiFS) chlorophyll a measurements for the continental margin of western North America. Findings reveal a marked alongshore variation in retained primary production that is highly correlated with the alongshore variation in resident fish yield. The highest productivity occurs off the coasts of Washington and southern British Columbia. Zooplankton data for coastal British Columbia confirm strong bottom-up trophic linkages between phytoplankton, zooplankton, and resident fish, extending to regional areas as small as 10,000 square kilometers.
A team of scientists from the University of Texas Marine Science Institute, including students from California and China, assessed the effects of crude oil exposure on adult and larval gelatinous zooplankton species - some commonly referred to as jellyfish.
Over the last decades, there have been increasing reports on the depletion of the stratospheric ozone layer (reviewed in [1]). At first, the thinning ozone layer and ozone holes have been mainly associated with polar regions [2], yet this has been observed in the northern hemisphere too [3-5]. Although the transmission of ultraviolet radiation (UVR) is highly variable due to e.g. solar variability or meteorological conditions, climate change is expected to enhance UVR, consisting of UVA (320 to 400 nm) and UVB (290 to 320 nm), in the long run [6, 7]. These reports initiated numerous investigations on possible effects of UV radiation on terrestric and aquatic (marine and freshwater) organisms. In the pelagic zone, an elevated sensitivity of phytoplankton and zooplankton versus UVR could be observed with effects on growth, production, cell biochemistry, ontogeny, genome and mortality (reviewed in [8-10]).. Beyond the UVR effects on single organisms, the ecosystem functions of the aquatic habitats ...
KAUST shows how plankton communities react to rising water temperatures may help model marine ecosystem responses to global warming.
Lai arī zooplanktonu primāri nes ūdens straumes, daudziem ir attīstījusies lokomocijas spēja, lai izvairītos no plēsējiem vai lai labāk paši spētu baroties. Īpaši tas raksturīgs lielāka izmēra zooplanktona sugām. Maza izmēra organisms, jo tas sīkāks, jo vieglāk tam noturēties ūdenī un nenogrimt. Toties vēžveidīgajiem, kuri ir lielāki, noturēties ūdenī ir iespējams tikai tādēļ, ja tie nemitīgi peld.[1] Atsevišķas virpotāju (Rotatoria) un kladoceru (Cladocera) sugas svaru samazina ar gļotu un recekļu palīdzību ķermenī. Svaru organismiem samazina arī gāzes un tauku ieslēgumi, piesātinātība ar ūdeni, audu recekļainība, skeleta porainība un izdilšana.[2] Arī ārējā forma ir piemērota, lai noturētos ūdenī. Tie ir dažādi izaugumi, kas kavē grimšanu,[1] ...
Copepoda (2014). Acartia (Acanthacartia) sinjiensis Mori, 1940. In: Walter, T.C. & Boxshall, G. (2017). World of Copepods database. Accessed at http://www.marinespecies.org/copepoda/aphia.php?p=taxdetails&id=345940 on 2017-12- ...
Viñas, M.D., Blanco-Bercial, L., Bucklin, A., Verheye, H., Bersano, J.G.F., Ceballos, S., 2015. Phylogeography of the copepod Calanoides carinatus s.l. (Krøyer) reveals cryptic species and delimits C. carinatus s.s. distribution in SW Atlantic Ocean. J. Exp. Mar. Biol. Ecol. 468, 97-104. (doi.org/10.1016/j.jembe.2015.03.012). Read More. ...
Recruitment of fish stocks is a complex process dependant on both spawning stock size and environmental factors. For a number of stocks, environmental factors appear to be contributing to higher recruitment via transport mechanisms and the role of feeding opportunities for early life stages. The potential role of these and other factors are being explored for stocks on Georges Bank where we have seen improved recruitment over the past decade while zooplankton populations of the Northeast Shelf ecosystem have also increased. The indication of important regional and seasonal dynamics means that temporal and spatially-explicit examinations of zooplankton are required to further examine the link between lower-trophic level production and fisheries production. Long Term Temperature-Area 1 (Gulf of Maine) ...
Amyotrophic lateral sclerosis, or ALS, commonly known as Lou Gehrigs disease, a neurodegenerative disease that destroys motor neurons and eventually leads to paralysis and death, currently affects about 30,000 people in the United States. (Before she passed away in 2009, my grandmother numbered among them.). In recent years, scientists have discovered a link between ALS (and other neurodegenerative diseases) and a neurotoxin produced by cyanobacteria called β-N-methylamino-L-alanine, or BMAA. Cyanobacteria, along with other types of algae, form the base of the aquatic food web; as algae is consumed by zooplankton, and zooplankton are eaten by larger organisms in turn, the neurotoxin can accumulate in animals that may end up on the menu for humans, including oysters, mussels, crabs, and other seafood.. Earlier this year, a team of scientists reported the discovery of an additional source of BMAA in aquatic environments in the journal PLoS ONE. Diatoms, intricate single-celled photosynthetic ...
Zeolite is an off-white clay-like mineral that has desirable chemical adsorbing properties. Its use in the koi world is as an ammonia adsorbing substrate that should be used as a short-term remedy for peaks in ammonia brought about by overstocking, overfeeding or filtration problems. As a means of chemical filtration zeolite should be placed as late in the filtration process as possible. Its porous nature makes it very liable to clogging, and its efficiency declines greatly if it is allowed to do so
Marian Blanca Ramírez from the CSIC in Spain has been studying the effects of LRRK2, a protein associated with Parkinsons disease, on cell motility. A Travelling Fellowship from Journal of Cell Science allowed her to spend time in Prof Maddy Parsons lab at Kings College London, learning new cell migration assays and analysing fibroblasts cultured from individuals with Parkinsons. Read more on her story here. Where could your research take you? The deadline to apply for the current round of Travelling Fellowships is 30 Nov 2017. Apply now!. ...
Studies of plankton communities in Red Sea waters provide insights into seasonal variations and dominant control mechanisms The communities of tiny picoplankton in oceans reveal a great deal about the health of marine ecosystems and food webs. KAUST ...
Genetic technologies pioneered by the Human Genome Project are opening up new realms of discovery for scientists studying microscopic Antarctic marine plants and animals.. Australian Antarctic Division molecular ecologist, Dr Bruce Deagle, said advances in DNA sequencing are enabling scientists to simultaneously identify hundreds of phytoplankton and zooplankton species (collectively called plankton) in a single sample.. Such samples include the stomach contents of fish, water and plankton-net samples collected from the Southern Ocean, and potentially even aquaculture feeds.. New methods of sequencing mean that we can sequence hundreds of thousands of genes at once, compared to the old days when we could only sequence one at a time, Dr Deagle said.. The approach for identifying plankton relies on barcodes, which are segments of DNA unique to different species. These genetic markers are amplified from the total DNA extracted from a sample and the resulting sequences are then compared to a ...
The aim of this paper is to investigate the manner in which predation and single-nutrient competition affect the dynamics of a non-toxic and a toxic phytoplankton species in a homogeneous environment (such as a chemostat). We allow for the possibility that both species serve as prey for an herbivorous zooplankton species. We assume that the toxic phytoplankton species produces toxins that affect only its own growth (autotoxicity). The autotoxicity assumption is ecologically explained by the fact that the toxin-producing phytoplankton is not mature enough to produce toxins that will affect the growth of its nontoxic competitor. We show that, in the absence of phytotoxic interactions and nutrient recycling, our model exhibits uniform persistence. The removal rates are distinct and we use general response functions. Finally, numerical simulations are carried out to show consistency with theoretical analysis. Our model has similarities with other food-chain models. As such, our results may be relevant to a
The article in Nature Ecology & Evolution deals with marine copepods, mm-sized crustaceans that are the dominant group of zooplankton and which are found everywhere. The changes we see in the North Atlantic are largely due to the fact that climate change is affecting marine copepods. In the central and eastern part of the North Atlantic, there are areas with fewer or smaller copepods than previously, and these changes in the biomass are significant for how much carbon can be transported from the atmosphere and down into the ocean, explains Professor Thomas Kiørboe from the Centre for Ocean Life, who has lead the study. In the north-western parts of the North Atlantic near Iceland and the USA on the other hand, the study shows that the copepod population has increased since 1960, so more carbon can be transported here from the atmosphere and down into the ocean. However, these are complex biological, chemical, and physical processes that are not yet sufficiently well understood to allow us to ...
Different Kinds of Life Some plankton are made of just one cell while others, like this zooplankton, are made of many cells. Plankton can be small. Really, really small. Most are so tiny, you cant see them without a microscope. Thats also true for many of the cells that make up your body-red blood cells, muscle cells in your toes, cells in your liver and stomach. And its
This is CUBIC jellyfish food specifically designed to nurture and grow planktivorous jellyfish species in the home aquarium. 
Jones T, Parrish JK, Peterson WT, Bjorkstedt EP, Bond NA, Ballance LT, Bowes V, J. Hipfner M, Burgess HK, Dolliver JE, et al. Massive Mortality of a Planktivorous Seabird in Response to a Marine Heatwave. Geophysical Research Letters. 2018 ;45(7):3193 - 3202. ...
Like drivers at a carwash, coral reef fish queue at cleaning stations to have parasites, slime, and broken scales nibbled away by smaller fish and by shrimps. These species interactions are interesting for their tropical ubiquity and the diversity of species that can be found as clients and cleaners. Although some cleaners are obligate professionals, others are dilettantes and adopt this life-style intermittently.. Floeter et al. have compiled data from around the tropics to tease out the selection pressures acting on these interactions. The basic emerging relationship is that, owing to abundance, the more common, planktivorous, and gregarious species take up most of the cleaners time. Client size doesnt seem to be very important, nor does professionalism, when it comes to dealing with carnivores that might eat the fish or shrimp that is cleaning them. Hence, this study adds to a growing body of evidence suggesting a central role for abundance in structuring species interactions. Guimarães et ...
Originally appears in the Spring 2011 issue. The ocean is home to a wide range of organisms, many which are of great value to people. Fisheries such as tuna and anchovy support national economies throughout the world. In addition, some marine organisms are vital to traditional cultures, such as whales to the Maori, while others have become icons in pop-culture-think Shamu, Jaws, or Nemo. These familiar ocean critters, however, would not exist without tiny marine organisms that are invisible without magnification. These microscopic organisms not only form the base of the marine food web but they also recycle essential nutrients, such as nitrogen, phosphorous, and carbon.. Microscopic life in the ocean is highly diverse, consisting of the single-celled prokaryotes, (bacteria and archaea), single-celled eukaryotes (like phytoplankton and protists) and multi-celled zooplankton. Each of these groups of organisms plays an essential role in the marine environment. Phytoplankton are primary producers, ...
The PLANKTON*NET data provider at the Alfred Wegener Institute for Polar and Marine Research is an open access repository for plankton-related information. It covers all types of phytoplankton and zooplankton from marine and freshwater areas. PLANKTON*NETs greatest strength is its comprehensiveness as for the different taxa image information as well as taxonomic descriptions can be archived. PLANKTON*NET also contains a glossary with accompanying images to illustrate the term definitions. PLANKTON*NET therefore presents a vital tool for the preservation of historic data sets as well as the archival of current research results. Because interoperability with international biodiversity data providers (e.g. GBIF) is one of our aims, the architecture behind the new [email protected] repository is observation centric and allows for mulitple assignment of assets (images, references, animations, etc) to any given observation. In addition, images can be grouped in sets and/or assigned tags to satisfy ...
World of Plankton, a collaborative project involving students and faculty of the School of Humanities, Arts and Social Sciecne (HASS) and the School of Science, is featured in the ACM SIGGRAPH exhbit Science of the Unseen: Didgtal Art Perspectives. The exhbiit may be viewed online at http://science-unseen.siggraph.org/. The work involved intensive study of freshwater ecology in the lab and in the field, including microscopic and underwater explorations of the visual, audio, material and behavioral aspects of zooplankton and phytoplankton and their environments and a lake model based on bathymetric data. The project was programmed in C# in Unity 3D with AI, behaviors, underwater lighting and physics. 3D models were created and rigged in Maya, and the soundtrack was composed by Electronic Arts senior Evan Gonzalez.. World of Plankton is a true partnership with GSAS, Arts, and the School of Science, with undergraduates creating 2- and 3D Art, animation, music, sound, game and installation ...
relatively small organisms that drift or float passively in the water and are carried wherever currents and tides take them. Plankton are often microscopic and are an important food source for other aquatic organisms. There are two types of plankton- phytoplankton (plants and autotrophs) and zooplankton (animals). ...
V2O Aquarium Foods Arctic E-Z Pods Frozen Aquarium Food - 200g Blister Cubes These COLD-WATER Marine Copepods, aka Cyclops, Zooplankton, etc., are highly nutritious for marine tropical fish and corals as well as the smaller freshwater aquarium fish and shrimp. They are E-Z to feed and extremely ric
Startle responses in zooplankton and other organisms attempting to escape a predator are likely to be executed with the maximum muscular force and power output that the organism can produce. We have estimated these parameters from observed velocity variation during the course of copepod escape jumps by means of direct numerical simulations. Our method represents an advance over previous attempts (Vlymen 1970; Fields 2000) since we solve the Navier-Stokes equation directly and thus include the so-called history term. Our approach, however, ignores the motion of the swimming legs and the estimated parameters are, thus, preliminary and, presumably, conservative. We nevertheless have confidence in our estimates, because the estimate of forces compare well with-but are slightly smaller than-those measured experimentally in similar-sized copepods tethered to a force transducer (Lenz & Hartline 1999; Lenz et al. 2004) or a spring (Alcaraz & Strickler 1988). Specifically, the observations of Lenz et al. ...
Bacterial respiration is not specifically mentioned in this equation but is included in the mud consumption of DO and in the planktonic DO consumption. In a well-managed waste-fed fish pond the DO in the morning should be only a few mg/l whereas in late afternoon the pond should be supersaturated with DO. Mud respiration probably lowers DO by less than 1 mg/l overnight and a fish population weighing 3000 kg/ha would also lower DO by only about 1 mg/l overnight. Phytoplankton photosynthesis is the major source of oxygen during daylight hours and, during the night, the major cause of oxygen depletion is respiration. It has been estimated that respiration of plankton (bacterioplankton, phytoplankton and zooplankton) can lower pond DO by 8-10 mg/l overnight. By far the greatest proportion of the DO depletion overnight is caused by the respiration of the phytoplankton that develop as a result of the nutrients contained in the waste. Phytoplankton provide feed for the largest percentage of fish farmed ...
1. Pervasive and accelerating changes to ecosystems due to human activities remain major sources of uncertainty in predicting the structure and dynamics of ecological communities. Understanding which biotic interactions within natural multitrophic communities are weakened or augmented by invasions of non-native species in the context of other environmental pressures is needed for effective management. 2. We used multivariate autoregressive models with detailed time-series data from largely freshwater and brackish regions of the upper San Francisco Estuary to assess the topology, direction and strength of trophic interactions following major invasions and establishment of non-native zooplankton in the early 1990s. We simultaneously compared the effects of fish and clam predation, environmental temperature and salinity intrusion using time-series data from , 60 monitoring locations spanning more than three decades. 3. We found changes in the networks of biotic interactions in both regions after ...
Most people usually think of copepods as tiny crustaceans which live as zooplankton near the, and for most part that is true. But it might be a surprise to some of you that over a third of all known copepods are actually parasitic and they live on/in all kinds of aquatic animals. One particularly successful family of such copepods is the Pennelidae - not that you would necessarily recognise them as crustacean if you are to ever see one. While most species in this family live on fish, the parasite that we are featuring today has evolved to be a bit different. Instead of infecting fish, it has managed to colonised aquatic mammals - specifically cetaceans (whales ...
Gelatinous zooplankton are often transparent. All jellyfish are gelatinous zooplankton, but not all gelatinous zooplankton are ... Zooplankton (from Greek zoon, or animal), are small protozoans or metazoans (e.g. crustaceans and other animals) that feed on ... Fish larvae are part of the zooplankton that eat smaller plankton, while fish eggs carry their own food supply. Both eggs and ... Aeroplankton Gelatinous zooplankton Ichthyoplankton Paradox of the plankton Seston Veliger Chust, G., Vogt, M., Benedetti, F., ...
Zooplankton have adapted by developing transparent bodies, bright colors, bad tastes and cyclomorphosis (seasonal changes in ... "Zooplankton". Marine Life/Marine Invertebrates. Retrieved 2012-04-04. "Reproduction in the Plankton". Plankton. Retrieved 2012- ... Studies have shown that although small in size certain gelatinous zooplankton are rich in protein and lipid. "Many holoplankton ... Holoplankton include both phytoplankton and zooplankton and vary in size. The most common plankton are protists. Holoplankton ...
doi:10.1007/s10750-012-1420-6. Z. Maciej Gliwicz (2008). "Zooplankton". In Patrick O'Sullivan; C. S. Reynolds (eds.). The Lakes ... as UVB that seriously damages zooplankton species (e.g. decrease feeding activity). Because of their thin membranes, which ...
Many species within the genus feed on zooplankton, such as Carybdea marsupialis. Carybdea commonly feed on plankton and mysids ... Carybdea rastoni , Zooplankton Guide. http://sio-legacy.ucsd.edu/zooplanktonguide/species/carybdea-rastoni Box Jellyfish: Life ... Carybdea rastoni , Zooplankton Guide. http://sio-legacy.ucsd.edu/zooplanktonguide/species/carybdea-rastoni Media related to ... Carybdea marsupialis , Zooplankton Guide. http://sio-legacy.ucsd.edu/zooplanktonguide/species/carybdea-marsupialis Wikimedia ...
In: D. Boltovskoy (ed.). South Atlantic zooplankton, 1. Backhuys, Leiden; p. 621-647. Richter G. & Seapy R.R. 1999. Heteropoda ... In: D. Boltovskoy (ed.), South Atlantic Zooplankton. Leiden: Backhuys Publ. Gofas, S.; Le Renard, J.; Bouchet, P. (2001). ... Richter G. & Seapy R. R. (1999). "Heteropoda". In: D. Boltovskoy (ed.) South Atlantic zooplankton, 1. Backhuys, Leiden: 621-647 ...
Zooplankton identification sheet. ...
Zooplankton Sheet 96. International Council for the Exploration of the Sea. Martina A. Roeleveld (1977). "Cephalopoda from the ...
"Didinium gargantua Meunier, 1910". www.zooplankton.cn. Retrieved 2016-12-13. Kahl, Alfred (1930-35). F. Dahl (ed.). Urtiere ...
"Leptodora kindti". Zooplankton of the Great Lakes. Central Michigan University. Retrieved March 10, 2010. CS1 maint: ... "Leptodora kindti". An Image-Based Key to the Zooplankton of the Northeast (USA). University of New Hampshire. Archived from the ... "Creature of the Month: Leptodora kindtii". Zooplankton-online.net. July 2005. Archived from the original on 2006-10-19. ... Zooplankton of the Great Lakes: a guide to the identification and ecology of the common crustacean species. University of ...
Modassir's research included Limnology, culture of molluscs; conservation strategies for mangrove ecosystems; zooplankton of ...
... mesopelagic zooplankton and particle flux, and the effects of mesoscale eddies and a large river plume on zooplankton community ... the ecology of gelatinous zooplankton "blooms" and their effect on fluxes of organic matter, the importance of zooplankton in ... "Zooplankton vertical migration and the active transport of dissolved organic and inorganic carbon in the Sargasso Sea." Deep- ... Steinberg's research focuses on the role that zooplankton play in marine food webs and the global carbon cycle, and how these ...
Feeds on zooplankton. Mann, B.Q., Buxton, C.D., Russell, B., Pollard, D., Carpenter, K.E. & Sadovy, Y. 2014. Polyamblyodon ...
Zooplankton (e.g. Daphnia) exhibit diel vertical migration. That is, they actively change their vertical position inside of ... Because zooplankton feed on the phytoplankton that form algae, the decrease in their predation upon phytoplankton may increase ...
Richter G. & Seapy R. R. (1999). "Heteropoda". In: Boltovskoy D. (ed.). South Atlantic zooplankton, 1. Backhuys, Leiden: 621- ...
They feed on zooplankton. Damselfish are commonly known to be vibrant species and as a result, they make their way to pet ...
It feeds on zooplankton. Witte, F.; de Zeeuw, M.P. & Brooks, E. (2010). "Haplochromis argens". IUCN Red List of Threatened ...
... including zooplankton); marine bacteria; and marine plants (e.g. phytoplankton, seaweeds, mangroves). As available web ...
... it feeds on zooplankton. This species is widespread in Indo-Pacific, from East Africa to the Tuamoto Islands, southern Japan, ...
They feed on zooplankton. Both parents mouthbrood the young until the attain a total length of 2.34 centimetres (0.92 in). ...
It feeds on zooplankton. It may be relatively common but declining because of threats: blast fishing, sedimentation, pollution ...
They feed on zooplankton. It is a species of minor interest to commercial fisheries but is taken by recreational anglers. Smith ...
"Microplastic Ingestion by Zooplankton". Environmental Science & Technology. 47 (12): 6646-6655. doi:10.1021/es400663f. ISSN ...
It feeds on zooplankton. The redback sand tilefish is monogamous and forms pairs to spawn. They can live in aggregations and ...
Boltovskoy, D. (1999). "South Atlantic Marine Zooplankton". Marine Species Identification. Hunt, J.C. & D.J. Lindsay, (1998) ...
"Hitchhikers on Gelatinous Zooplankton". The JelliesZone. Retrieved 2015-06-24. CS1 maint: discouraged parameter (link). ...
... juveniles feed on zooplankton. The barramundi is euryhaline, but stenothermal. It inhabits rivers and descends to estuaries and ...
It prefers depths between 20 and 105 m (66 and 344 ft). It feeds on zooplankton. Hoplolatilus starcki was first formally ...
They feed on zooplankton. Some species, such as the hardyhead silverside, Atherinomorus lacunosus, are commercially fished. The ...
They feed on zooplankton. Froese, Rainer and Pauly, Daniel, eds. (2012). "Heteroconger pellegrini" in FishBase. July 2012 ...
They feed on zooplankton. Witte, F.; de Zeeuw, M.P. & Brooks, E. (2016). "Haplochromis azureus". IUCN Red List of Threatened ...
Zooplankton are also a key link in the biomagnification of pollutants such as mercury. Zooplankton can also act as a disease ... As a result, zooplankton are primarily found in surface waters where food resources (phytoplankton or other zooplankton) are ... Comparison of zooplankton-mediated carbon cycles Zooplankton play a critical role in supporting the oceans biological pump ... Just as any species can be limited within a geographical region, so are zooplankton. However, species of zooplankton are not ...
Gelatinous zooplankton are often transparent. All jellyfish are gelatinous zooplankton, but not all gelatinous zooplankton are ... Gelatinous zooplankton from the Arctic Ocean Jellyfish and other gelatinous zooplankton PLANKTON NET: information on all types ... Gelatinous zooplankton are fragile animals that live in the water column in the ocean. Their delicate bodies have no hard parts ... Marine zooplankton play a major role as ecosystem engineers in coastal and open ocean ecosystems because they serve as links ...
6 m. The zooplankton community was dominated by D. hyalina at the time of the study. Zooplankton within the epilimnion (0-4 m) ... However, unless the zooplankton repeatedly acquire and release viable bacteria between the different water masses, zooplankton ... 26). However, the significance of zooplankton association goes beyond pathogenic bacteria, because zooplankton harbors very ... Zooplankton.. The freshwater cladoceran D. magna, originating from a monoclonal culture, was kept in M4 medium (35) and fed ...
... represent a significant fraction of the total zooplankton population. Seasonal and interannual variability in the small ...
... microscopic zooplankton are declining with serious ramifications for the regions food chain. ... But zooplankton, and the animals that depend on them, might not be ready for the all-you-can-eat buffet. "Animals are timed to ... In turn, zooplankton are dependent on sea ice, feeding on the algae that grows on the underside of the ice. Every spring, the ... Robert Campbell, a zooplankton biologist at the University of Rhode Island unassociated with the project, says researchers ...
Zooplankton Data.. Zooplankton data were collected in spring (April-May) and summer (June-July) from 1959 to 1993 by Knipovich ... zooplankton. Climate change and variability have been correlated to various responses in zooplankton phenology, distribution, ... For example, a change in temperature might directly affect zooplankton physiology (3) or indirectly influence zooplankton ... Mechanisms behind climate effects on zooplankton. Kristina Ø. Kvile, Øystein Langangen, Irina Prokopchuk, Nils C. Stenseth, ...
Zooplankton of the Atlantic and Gulf Coasts: A Guide to Their Identification and Ecology. ... exit head tail excurrent opening fine food gathering filters mouth 304 IDENTIFICATION AND BIOLOGY OF COMMON ZOOPLANKTON eral ...
Zooplankton Ökologie und Evolution. Unsere Gruppe befindet sich an der Eawag in Dübendorf, ist aber auch Teil des Instituts für ...
Zooplankton biodiversity Seafloor processes Revealing the secrets of Sur Ridge Exploring Sur Ridges coral gardens Life at Sur ... Haddock, S. H. D., Case, J. F., (1999). Bioluminescence spectra of shallow and deep-sea gelatinous zooplankton: ctenophores, ... Steve Haddocks research group and their collaborators study deep-sea gelatinous zooplankton (various types of jelly-like ...
While zooplankton time-series collected in a standard sampling method for more than a couple of decades are rare, the ... ICES/PICES Zooplankton Production Symposium: Sanae Chibae. Discovering the new through scrutiny of the old: Sanae Chibae ... Our next feature from the ICES/PICES Zooplankton Production Symposium is from Sanae Chibae​​ who spoke to participants about ... Meanwhile, many existing zooplankton time-series are struggling to continue observation efforts, some have even terminated due ...
... at Curtin University studied the impact of commercial seismic surveys on zooplankton populations by carrying out tests using ... surveys used in petroleum exploration could cause a two to three-fold increase in mortality of adult and larval zooplankton, ... "These sonar runs imaged the zooplankton, and showed a lowered zooplankton presence starting 15 minutes after the air gun ... "Zooplankton underpin the health and productivity of global marine ecosystems and what this research has shown is that ...
Tackx MLM, Nathalie DP, Riet VM, Azemar F, Abdelhacq H, Stefan VD et al (2004) Zooplankton in the Schelde estuary, Belgium and ... Azeiteiro UMM, Marques JC, Ré P (1999) Zooplankton annual cycle in the Mondego river estuary (Portugal). Arq Mus Bocage 3:239- ... Badosa A, Boix D, Brucet S, López-Flores R, Gascón S, Quintana XD (2007) Zooplankton taxonomic and size diversity in ... Marques SC, Azeiteiro UM, Marques JC, Neto JM, Pardal MA (2006) Zooplankton and ichthyoplankton communities in a temperate ...
The Zooplankton Methodology Manual, the Zooplankton Status Reports, and the International Zooplankton Symposia are among other ... Fostering advances in zooplankton ecology for 30 years. Created in 1991, ICES Working Group on Zooplankton Ecology continues ... Zooplankton production. In the past five years, further advances in zooplankton production assessment include the evaluation of ... Next steps include the organization of the 7th ICES/PICES Zooplankton Production Symposium to gather zooplankton enthusiasts ...
SOES6009 Zooplankton Ecology and Processes. Module Overview. The module will assess the role of zooplankton in the global ... 2. Review zooplankton reproduction and life cycle strategies. 3. Understand how biotic and abiotic factors regulate zooplankton ... Laboratory skills in zooplankton identification using dichotomous taxonomic keys. *Methods for analysing zooplankton seasonal ... Know how feeding ecology (diet, rates, impact) is determined in zooplankton; understand the role that zooplankton play in ...
Zooplankton abundance: a neglected key element in the evaluation of reservoir water quality. Limnologica 69: 46-54.CrossRef ... The usefulness of zooplankton as lake ecosystem indicators: rotifer trophic state index. Polish Journal of Ecology 60: 339-350. ... Zooplankton and its grazing as indicators of trophic status in Dutch lakes. Environmental Monitoring and Assessment 3: 343-354. ... Indices of zooplankton community as valuable tools in assessing the trophic state and water quality of eutrophic lakes: long ...
Without the generosity and cooperation of many photographers working throughout NOAA, members of other government agencies, and private citizens who have given access to their collections, this site would not be possible.. Site Index. ...
Persons tagged with «Zooplankton». Name. Phone. E-mail. Tags. Hessen, Dag Olav Professor +47 22854553 +4795037899 (mob) d.o. ... Population genomics, Conservation, Ancient DNA, Metabarcoding, Marine ecology, Seabirds, Zooplankton Titelman, Josefin ...
A concentrated blend of marine zooplankton designed to provide the essential fatty acids, proteins, vitamins, amino acids, & ... Seachem Reef Zooplankton is a concentrated blend of marine zooplankton designed to provide the essential fatty acids, proteins ... Reef Zooplankton contains a natural source of carotenoids which provides essential proteins as well as a more bioavailable ... In addition, Reef Zooplankton is enhanced to increase the bioavailability of important nutrients such as proteins, lipids, B ...
Enhancement of Algal Growth and Productivity by Grazing Zooplankton Message Subject. (Your Name) has forwarded a page to you ...
Zooplanktons jeb dzīvnieku planktons ir daļa no planktona. Kā jau zinātniskais grieķu vārds zoon (ζῴον) norāda, tas apzīmē to ... Zooplanktons ir sastopams okeānā, jūrā un saldūdens krātuvēs. Tam nav konkrētu robežu vai reģionu. Pamatā tas ir viscauri visā ... Visvairāk zooplanktons attīstās reģionos, kuros ir bagātīgi barības resursi. Tomēr izplatību ierobežo dažas fiziskas barjeras. ... Pastāv arī pretēja versija, ka zooplanktons tumsā migrē uz leju, sekojot fitoplanktonam, kurš naktī grimst uz leju. Daži ...
Dr. Postna of the Institute for Bio Aquatic Analysis told the Loch Ness Inquirer, "we normally find microbe sized plankton living on a diet of microbial vegetation, but this is something new. Some of the plankton in Loch Ness are aggressive carnivorous predators, which have mutated and grown upto 7.5cm (3 inches) in diameter.". "The only possible reason is the existence of formerly undiscovered radioactive elements beneath Loch Ness. We are going to have to carry out a great deal of research and the ramifications for the rest of the planet are quite obvious.". The Loch Ness Inquirer has been told that some researchers wanted to keep the discovery quiet. One well-known individual said, "Loch Ness already has a reputation for pseudo science and attracts a variety of dabblers and paranormal enthusiasts. A story about massive plankton chasing after human swimmers is only likely to attract more unorthodox interest and that could harm the serious hunt that is continuing for the Loch Ness ...
In this study, zooplankton biomass and gut fluorescence (GF), electron transport system (ETS) activity, and aminoacyl-tRNA ... Our findings show how warming and dust events may interact, affecting the zooplankton biomass and metabolism in these ... The effect of a strong warm winter on subtropical zooplankton biomass and metabolism ...
Rather, it is the amino acids produced by the blue-green algae that supply the food web, so that zooplankton and fish can also ... Lavish blue-green algae: Surprising supply of amino acids for zooplankton. 09.04.2018 ... blooms this excessive supply of nutrients before winter is a relevant parameter for the seasonal growth cycle of zooplankton - ...
... of total zooplankton abundance. Season-specific differences were highly significant. The overall zooplankton richness and ... Zooplankton samples were taken with a suction pump filter 600 liters of water per sample through a conical plankton net of 60 ... Regarding the zooplankton abundance, the highest value (878.47 ind.m-3) was recorded during the flood period, followed by ... The zooplankton community consisted of 125 species; the testate amoebae was the most species-rich (56 species) and the most ...
No significant differences in abundance and zooplankton composition were found among oceans, with depth being consistently the ... The contribution of copepods to the zooplankton community increased with the depth although, as expected, their abundance ... The abundance and composition of zooplankton down to 3000 m depth was studied in the subtropical and tropical latitudes across ... Zooplankton Abundance and Diversity in the Tropical and Subtropical Ocean by Mᵃ Luz Fernández de Puelles ...
These are colonial animals, mostly transparent, with many specialized parts; relatives of jellyfish. A pneumatophore is a gas-filled float positioned at the top of the colony in some siphonophores. ...
We conduct research on zooplankton response to seasonal and inter-annual phytoplankton dynamics, zooplankton physiological ... Zooplankton play a key role in the marine ecosystem. They feed on phytoplankton and are a major food source for fish and other ... and the contribution of zooplankton to nutrient cycling and the biological pump. ... response to ocean acidification and warming, the role zooplankton play in microplastic consumption and fate, ...
Calanus backs Norways decision allowing commercial harvesting of omega-3 rich zooplankton. By Will Chu ...
... comparatively less has been conducted on lower trophic levels including zooplankton and the subsequent transfer to predators, ... We present here the first database for mercury uptake and transfer exclusively within zooplankton food webs in northern marine ... in individual zooplankton taxa collected over a period of eight years (2003-2010) from across Hudson Bay (including Hudson ... comparatively less has been conducted on lower trophic levels including zooplankton and the subsequent transfer to predators, ...
Marine Zooplankton Slide Schneiders & Fast green. Explano-Mount™. Each. Retrieving. The minimum order for this item is . ...
  • Chlorophyll biomass in spring and C. finmarchicus biomass in summer relate positively to shallow mixed layer depth and high wind speed in spring, suggesting climate effects on zooplankton through food availability. (pnas.org)
  • In the 1990s, many studies revealed significant correlations between zooplankton biomass and climate indices, such as the North Atlantic Oscillation and the North Pacific Decadal Oscillation. (ices.dk)
  • A significant recent achievement of the group is the creation of a reference database of key zooplankton traits , used to identify the most important zooplankton species in terms of abundance, biomass, or ecosystem function in ICES seas. (ices.dk)
  • In this study, zooplankton biomass and gut fluorescence (GF), electron transport system (ETS) activity, and aminoacyl-tRNA synthetases (AARS) activity were measured as proxies of metabolism in the oceanic waters north of the Canary Islands during the winter-spring period of 2010. (ingentaconnect.com)
  • Our findings show how warming and dust events may interact, affecting the zooplankton biomass and metabolism in these subtropical waters. (ingentaconnect.com)
  • Zooplankton biomass enhances growth, but not survival, of first-feeding Pomoxis spp. (osu.edu)
  • Daphnia), cyanobacterial blooms often co-exist with high biomass of small-bodied zooplankton in nature. (lu.se)
  • Primary productivity can affect zooplankton biomass and diversity by bottom-up driven mechanisms while zooplankton biomass and diversity can also be affected by fish via top-down control. (uio.no)
  • The resource use efficiency of zooplankton gives an estimate about the realized amount of zooplankton biomass per available nutrients (total phosphorus). (uio.no)
  • Methods: To investigate the effect of light and primary productivity in lakes on zooplankton diversity, biomass and resource use efficiency we sampled 75 lakes in southern Norway and Sweden during summer 2011. (uio.no)
  • Zooplankton samples were taken to determine zooplankton biomass (as dry weight) and zooplankton diversity (species richness). (uio.no)
  • Results: Zooplankton biomass was positively affected by total phosphorus and negatively affected by total organic compounds (TOC). (uio.no)
  • Additionally, a positive relationship between the estimated gross primary productivity (EPP) and zooplankton biomass was observed. (uio.no)
  • Discussion: While the amount of nutrients had a positive effect on zooplankton biomass, increasing DOC concentrations reduced the amount of light and thus had a negative effect of zooplankton. (uio.no)
  • There was no significant effect of zooplankton diversity or fish diversity on zooplankton biomass, while they both gave a negative contribution to zooplankton resource use efficiency. (uio.no)
  • Zooplankton abundance, biomass and richness decreased with increasing chloride concentrations to an extent that would likely impair ecosystem functions in highly impacted lakes, and no zooplankton taxa were positively associated with high chloride concentrations. (queensu.ca)
  • Overall, zooplankton in our experiment were highly sensitive to increasing chloride concentrations and experienced 28 - 55% declines in abundance and biomass at the CWQG, suggesting that Shield lakes are not sufficiently protected from the impacts of road salt pollution. (queensu.ca)
  • Biomass, proximate composition, organic carbon and calorie content of assorted zooplankton from the surface waters were studied. (niscair.res.in)
  • No clear relationship was established between zooplankton biomass and sea temperature. (bibsys.no)
  • Rich year classes of cod seem to be born more frequently in years when zooplankton biomass is above average, while medium and poor year classes are possibly more frequent in years with lower abundance of plankton, but the data are not sufficient for a conclusion. (bibsys.no)
  • Current fauna, biomass and distribution on zooplankton in the upper water of the Yinluan Project are investigated and studied. (cnki.com.cn)
  • Detailed vertical and temporal distribution and biomass of zooplankton were evaluated at four heights off the bottom and at six times throughout the diel cycle over a coral reef in the Florida Keys (USA). (washington.edu)
  • Taxon-based zooplankton CHN values paired with abundance data were used to estimate biomass. (washington.edu)
  • While copepods were the numerically dominant organisms, their contribution to biomass was only 35% of the total zooplankton biomass. (washington.edu)
  • Inter-annually, zooplankton biomass in the Chukchi Sea increased through 1946-2012. (nii.ac.jp)
  • The principal aim of the study is to characterize migration patterns and biomass temporal evolution of zooplankton along the water column. (ocean-sci.net)
  • The biomass ratio of zooplankton to phytoplankton (ZB/PB) is used as an index of the likely value of biomanipulation to achieve this outcome, but values have not been explored for South African systems. (scielo.org.za)
  • Phytoplankton biomass is controlled by a combination of "bottom-up" factors such as temperature, light and nutrients and "top-down" factors, in particular zooplankton predation. (uio.no)
  • This alternative hypothesis basically says that the phytoplankton biomass mainly varies depending on the balance between phytoplankton growth and zooplankton feeding on phytoplankton, i.e., a form of "top-down" control. (uio.no)
  • The annual cycle of mesozooplankton biomass in the region is described, and mechanisms for the replenishment of zooplankton in the nearshore zone after strong upwelling events are proposed. (noaa.gov)
  • We hypothesized that species richness (S), species diversity (H), functional diversity (FD), biomass, and size of zooplankton would decrease with increasing salinity. (au.dk)
  • Crustacean zooplankton have been found to house the bacterium Vibrio cholerae, which causes cholera, by allowing the cholera vibrios to attach to their chitinous exoskeletons. (wikipedia.org)
  • V. cholerae, including both serogroups O1 and O139, is found in association with crustacean zooplankton, mainly copepods, and notably in ponds, rivers, and estuarine systems globally. (nih.gov)
  • Vertical distribution of the crustacean zooplankton was similar to the distribution of phytoplankton. (deepdyve.com)
  • We tested several of their cornerstone hypotheses by measuring the nucleic acid (NA) and phosphorus (P) content of crustacean zooplankton species in 22 high mountain lakes (Sierra Nevada and the Pyrenees mountains, Spain). (diva-portal.org)
  • Seasonal variations in the stable isotope composition (delta C-13 and delta N-15) of crustacean zooplankton and their putative food sources in oligotrophic Loch Ness were recorded during 1998. (mpg.de)
  • Annually, crustacean zooplankton in Loch Ness derive approximately 40% of their body carbon from allochthonous sources, likely mediated via microbial links. (mpg.de)
  • We provide the first assessment of regional water chemistry and plankton (phytoplankton and crustacean zooplankton) for a suite of lakes near the Sutton River region of the north-central Hudson Bay Lowlands (HBL). (bioone.org)
  • Crustacean zooplankton community composition and richness in the HBL lakes was similar to communities found in Ontario lakes in more temperate regions within the Precambrian Shield. (bioone.org)
  • We have investigated both total (THg) and monomethylmercury (MMHg) concentrations, and isotopic signatures (δ(15)N and δ(13)C) in individual zooplankton taxa collected over a period of eight years (2003-2010) from across Hudson Bay (including Hudson Strait and Foxe Basin) as part of research icebreaker cruises. (biomedsearch.com)
  • Reviewed here are results from a wide range of laboratory and field experiments examining the interaction of cyanobacteria and a diverse zooplankton taxa including cladocerans, copepods, and heterotrophic protists from temperate to tropical freshwater systems. (lu.se)
  • Effects of each stressor alone and in combination were examined using two common wetland taxa: Zooplankton, Simocephalus vetulus, and tadpoles (Gosner stage 25) of Rana pipiens. (nih.gov)
  • Zooplankton abundance averaged 4396 +/- 1949 SD individuals m(-3), but temporal and spatial distributions varied for individual zooplankton taxa by time of day and by height off the bottom. (washington.edu)
  • Multidimensional scaling grouped stations by the species composition and developmental stages of the zooplankton taxa. (slideserve.com)
  • All primary data are presented on this CD-ROM in a common format, along with maps of the station locations and a listing of zooplankton taxa collected during these cruises. (noaa.gov)
  • Let's take a look at some examples from the last half a century that illustrate the importance of zooplankton. (iisd.org)
  • As the model has limited representation of zooplankton-mediated remineralization processes, we suggest that these results point to the importance of zooplankton in setting BCP eff , including particle grazing and fragmentation, and the effect of diel vertical migration. (biogeosciences.net)
  • The contribution of copepods to the zooplankton community increased with the depth although, as expected, their abundance strongly decreased. (mdpi.com)
  • In lakes and ponds, the most common groups of zooplankton include Cladocera and Copepods (which are both micro-crustaceans), rotifers and protozoans. (iisd.org)
  • Other zooplankton, such as many Copepods, are more selective and pick out individual particles or zooplankton prey based on their size, shape and taste. (iisd.org)
  • Two dominant zooplankton groups were found to be consistently associated with detection of V. cholerae and/or occurrence of cholera cases, namely, rotifers and cladocerans, in addition to copepods. (nih.gov)
  • A wide range of zooplankton have also been shown to have benthic resting stages including rotifers, cladocerans and copepods [ 10 ]. (royalsocietypublishing.org)
  • To quantify zooplankton-associated methane production rates, we developed a sea-going methane stripping-oxidation line to determine methane release rates from copepods grazing on 14 C -labelled phytoplankton. (biogeosciences.net)
  • Sample analysis revealed the presence of 29 species of zooplankton including 16 species of Rotifers, 8 species of Cladocera and 5 species of Copepods. (omicsonline.org)
  • Lipid rich zooplankton, such as copepods, provide the crucial link between the primary producers and the higher trophic levels. (nova.edu)
  • Zooplankton is plankton that consists of tiny animals, such as rotifers, copepods, and krill, and of microorganisms once classified as animals, such as dinoflagellates and other protozoans. (assignmentpoint.com)
  • Gelatinous zooplankton are fragile animals that live in the water column in the ocean. (wikipedia.org)
  • Gelatinous zooplankton are often transparent. (wikipedia.org)
  • All jellyfish are gelatinous zooplankton, but not all gelatinous zooplankton are jellyfish. (wikipedia.org)
  • Jellyfish, and more gelatinous zooplankton in general, which include salps and ctenophores, are very diverse, fragile with no hard parts, difficult to see and monitor, subject to rapid population swings and often live inconveniently far from shore or deep in the ocean. (wikipedia.org)
  • Pelagic siphonophores Gelatinous zooplankton like this narcomedusan can be key predators in deep pelagic food webs Narcomedusa ingesting a salp chain Helmet jellyfish feeding on an armhook squid Trachymedusa with a large red mysid in its gut Biological oceanic processes, primarily carbon production in the euphotic zone, sinking and remineralization, govern the global biological carbon soft‐tissue pump. (wikipedia.org)
  • In particular, gelatinous zooplankton (Cnidaria, Ctenophora, and Chordata, namely, Thaliacea) are universal members of plankton communities that graze on phytoplankton and prey on other zooplankton and ichthyoplankton. (wikipedia.org)
  • Steve Haddock's research group and their collaborators study deep-sea gelatinous zooplankton (various types of jelly-like animals). (mbari.org)
  • some species associated with gelatinous zooplankton. (ucsd.edu)
  • Though initially driven by the needs of ecosystem-based management for sustainable fisheries, long-term zooplankton change study has been expanding its goals toward wider perspectives in recent decades, such as ecosystem responses to climate and anthropogenic changes, plankton roles in regional and global biogeochemical cycles, and biodiversity conservation. (ices.dk)
  • While zooplankton time-series collected in a standard sampling method for more than a couple of decades are rare, the Continuous Plankton Recorder survey and CalCOFI program have conducted species level analysis on over 50 years of observation data and have greatly increased our knowledge on long-term marine ecosystem changes in the North Atlantic and eastern North Pacific by the mid-2000s. (ices.dk)
  • Within ICES, ongoing collaboration with the Working Group on Integrated Morphological and Molecular Taxonomy (WGIMT) has led to advances on integr​ative zooplankton taxonomy via the organization of several joint theme sessions at ICES Annual Science Conference, training workshops, peer-reviewed papers, and the relaunch of ICES Plankton Identification leaflet series , with updated and new leaflets. (ices.dk)
  • Collaboration with the Working Group on Phytoplankton and Microbial Ecology​ (WGPME) will soon lead to the production of a new Plankton Status Report, including more than 160 phyto- and zooplankton time-series! (ices.dk)
  • Establish the role of zooplankton in the pelagic marine community and introduce holo- and mero-plankton diversity through taxonomic features as well as functional biology. (southampton.ac.uk)
  • Be aware how plankton dynamics and pelagic ecosystem function will differ in response to hydroclimatic variability, through the use of zooplankton indicator species, long-term datasets and hypothesis-testing experiments. (southampton.ac.uk)
  • In addition to their functional role, marine zooplankton are considered to be excellent indicators of climate change because a) most species are short lived, which leads to tight coupling between environmental change and plankton dynamics, and b) they are free floating, so respond easily to changes in temperature and oceanic current systems by expanding and contracting their ranges. (southampton.ac.uk)
  • So, phytoplankton are plankton that can photosynthesize and zooplankton are the animal like plankton, such as the larval forms of muscles or clams, etc. (enotes.com)
  • In turn, the function of bloom-dominated plankton ecosystems, the coupling between primary producers and grazers, the stability of blooms, and the potential to use top down biomanipulation for controlling cyanobacteria depend largely on the species, abundance, and traits of interacting cyanobacteria and zooplankton. (lu.se)
  • Rising eutrophication in South African reservoirs is of major concern, leading to the consideration of top-down biomanipu lation as a management option - reducing zooplankton-eating fish to sustain zooplankton grazing pressure and thus restrict autotrophic plankton that proliferate with nutrient increases. (scielo.org.za)
  • Reef ZooPlankton is a blend of protein based plankton such as artemia and rotifer species and is recommended for feeding LPS and SPS corals. (seachem.com)
  • The regression logistic model here defined, correctly suggested that the distribution of zooplankton species was mainly dependent on salinity and water temperature. (springer.com)
  • The cross-shelf distribution of zooplankton on the northern Gulf of Alaska shelf in May 1998, 1999 and 2000 was related to the distribution of water properties on the shelf. (slideserve.com)
  • The waterborne distribution of zooplankton helps its population survive harsh environmental conditions such as freezing, high heat, large storms, and other severe natural phenomena. (assignmentpoint.com)
  • What is the difference between phytoplankton and zooplankton?Classify the 7 protists in these 2 categories. (enotes.com)
  • The difference between phytoplankton and zooplankton is the mode of gaining nutrition. (enotes.com)
  • What would be the impact of oil spills on phytoplankton and zooplankton? (enotes.com)
  • A typical example of benthic-pelagic coupling is re-suspension of nutrients from the sediments because of storms that stimulates bacterial, phytoplankton and zooplankton growth [ 2 - 5 ]. (royalsocietypublishing.org)
  • Effect of metalimnetic gradient on phytoplankton and zooplankton (Rotifera, Crustacea). (deepdyve.com)
  • Badosa A, Boix D, Brucet S, López-Flores R, Gascón S, Quintana XD (2007) Zooplankton taxonomic and size diversity in Mediterranean coastal lagoons (NE Iberian Peninsula): influence of hydrology, nutrient composition, food resource availability and predation. (springer.com)
  • Temporal and Spatial Variations in Abundance and Diversity of Zooplankton Fauna of Opa Reservoir, Obafemi Awolowo University, Ile-Ife, Southwest Nigeria. (springer.com)
  • The unit covers aspects of Antarctic zooplankton including diversity,physiology, habitats, spatial/temporal ecology and climate change issues. (edu.au)
  • In keeping with their taxonomic diversity, zooplankton use a variety of feeding strategies, and they may eat bacteria, algae, other zooplankton and can even be parasites. (iisd.org)
  • Role of zooplankton diversity in Vibrio cholerae population dynamics and in the incidence of cholera in the Bangladesh Sundarbans. (nih.gov)
  • Indeed, recent studies highlight the remarkable diversity and flexibility in zooplankton responses to. (lu.se)
  • Zooplankton diversity increased with longitude but decreased with latitude while resource use efficiency (RUE) of zooplankton showed the opposite relation and decreased with longitude and increased with latitude. (uio.no)
  • Resource use efficiency of zooplankton also decreased with increasing zooplankton and fish diversity. (uio.no)
  • Fish diversity and zooplankton diversity showed an increase among the longitudinal gradient and a decrease with latitude. (uio.no)
  • In this study we examined the diversity and distribution pattern of zooplanktons in the Bhimtal Lake, along with evaluation of the relationships among different zooplankton groups and abiotic factors during the period September, 2013 to August, 2014. (omicsonline.org)
  • Zooplankton communities are known to be highly susceptible to a wide range of factors like environmental changes, temporal abundance and seasonal variation, and their diversity is a marker of water quality in trophic conditions in cold, temperate and tropical waters [ 2 ]. (omicsonline.org)
  • However, zooplankton diversity and density also depends on the inter-specific predation by invertebrates [ 4 ]. (omicsonline.org)
  • The present study was designed to outline the temporal distribution pattern, along with measuring species diversity of zooplankton during the year 2013-2014. (omicsonline.org)
  • Virtue, P. . 2007 Perspectives on marine zooplankton lipids. (nerc.ac.uk)
  • Dilution mechanisms have also been suggested: the lipids formed by the zooplankton don't contain PCBs, causing a lower PCB concentration expressed per gram lipid in the zooplankton. (marinespecies.org)
  • In addition, Reef Zooplankton™ is enhanced to increase the bioavailability of important nutrients such as proteins, lipids, B vitamins, and other organic pigments, thus, corals expend less energy to derive the nutritional benefit. (seachem.com)
  • Individual zooplankton are usually microscopic, but some (such as jellyfish) are larger and visible to the naked eye. (wikipedia.org)
  • Zooplankton are generally larger than phytoplankton, mostly still microscopic but some can be seen with the naked eye. (wikipedia.org)
  • Many protozoans (single-celled protists that prey on other microscopic life) are zooplankton, including zooflagellates, foraminiferans, radiolarians, some dinoflagellates and marine microanimals. (wikipedia.org)
  • The tiny Calanus glacialis may lack the charisma of a polar bear, but these microscopic zooplankton form the foundation of the Arctic's food chain. (upi.com)
  • Zooplanktons are microscopic animals which are in the second energy level in food chains. (differencebetween.net)
  • Zooplanktons are microscopic free swimming animals which represent a major part of aquatic fauna and are known to be indispensable link between the primary producers and consumers of Lake Ecosystem. (omicsonline.org)
  • Zooplankton are small animals (many are microscopic) that spend their lives drifting with ocean currents. (scor-int.org)
  • Individual zooplankton are usually microscopic, but some (such as jellyfish) are larger and visible with the naked eye. (assignmentpoint.com)
  • represent a significant fraction of the total zooplankton population. (awi.de)
  • the testate amoebae was the most species-rich (56 species) and the most abundant group (71.5%) of total zooplankton abundance. (scielo.br)
  • For example, a change in temperature might directly affect zooplankton physiology ( 3 ) or indirectly influence zooplankton through effects on their prey ( 4 ) or ecosystem trophic structure ( 5 ). (pnas.org)
  • 7. Understand how zooplankton can be used as indicators of climate change, and how conditions associated with climate change affect zooplankton species and populations. (southampton.ac.uk)
  • Author's Abstract] Dissolved oxygen is necessary for aerobic respiration, and therefore can influence zooplankton communities. (washington.edu)
  • In anticipation of a proposed global increase of cyanobacteria blooms this excessive supply of nutrients before winter is a relevant parameter for the seasonal growth cycle of zooplankton - but also for fish-stocks. (innovations-report.com)
  • The objective of the present work is to evaluate the seasonal patterns of species richness and abundance of the zooplankton community in a semi-arid river, Northeastern of Brazil. (scielo.br)
  • The hydrological regime was important in structuring the zooplankton community, emphasising the importance of the Parnaíba River and its seasonal variation for biodiversity conservation in the Brazilian semi-arid region. (scielo.br)
  • We conduct research on zooplankton response to seasonal and inter-annual phytoplankton dynamics, zooplankton physiological response to ocean acidification and warming, the role zooplankton play in microplastic consumption and fate, and the contribution of zooplankton to nutrient cycling and the biological pump. (rutgers.edu)
  • The report concerns zooplankton studies including distribution, seasonal occurrence and vertical migration of zooplankton populations in the dumping grounds. (dtic.mil)
  • Our results thus demonstrate that physical (bottom-up) and zooplankton (top-down) effects alternate to shape the seasonal dynamics of phytoplankton in the North Atlantic. (uio.no)
  • Seasonal changes in the importance of the source of organic matter to the diet of zooplankton in Loch Ness, as indicated by stable isotope analysis. (mpg.de)
  • 6. Establish the role that zooplankton play in marine food webs and biogeochemical cycling, and their importance to fisheries. (southampton.ac.uk)
  • understand the role that zooplankton play in marine pelagic food webs and biogeochemical cycling in a variety of marine ecosystems characterised by differing levels of productivity. (southampton.ac.uk)
  • Because of the important role that zooplankton play in freshwater food webs, we have been collecting and studying them at IISD-ELA for our entire 51-year history-in fact, our zooplankton collection now exceeds 30,000 samples. (iisd.org)
  • We investigate the potential role that zooplankton play in the biological carbon pump using both in situ observations and model output. (biogeosciences.net)
  • A concentrated blend of marine zooplankton designed to provide the essential fatty acids, proteins, vitamins, amino acids, & natural carotenoids needed for coral growth. (petco.com)
  • Building on this effort, the group is developing a WGZE Biometrics Atlas which will serve as a tool to associate traits with species and map trait distribution back to known distributions of species, helping to analyze the functional structure of zooplankton communities. (ices.dk)
  • Zooplankton were identified to the lowest taxonomic category possible. (slideserve.com)
  • Typical models featuring zooplankton Upper left: Biogeochemical models Right: Ecosystem models Lower left: Size-spectra models These models also have temporal and spatial components. (wikipedia.org)
  • Marine zooplankton play a major role as ecosystem engineers in coastal and open ocean ecosystems because they serve as links between primary production, higher trophic levels, and deep‐sea communities. (wikipedia.org)
  • Today, the ocean science community recognizes the benefits of long-term zooplankton data, and there is an increasing demand for global integration and sharing of the data, with which various international projects are trying to develop ecosystem/biodiversity indicators for climate change study, fisheries, biodiversity conservation, and other sustainable development purposes. (ices.dk)
  • Climate change and ecosystem functioning were the two main scientific drivers for the establishment of the Working Group on Zooplankton Ecology (WGZE) and are still critical in influencing the direction of the group's work and the topics addressed. (ices.dk)
  • The module will assess the role of zooplankton in the global marine ecosystem. (southampton.ac.uk)
  • Zooplankton play a key role in the marine ecosystem. (rutgers.edu)
  • Availability and quality of food resources in the aquatic ecosystem directly affects the phytoplankton abundance, which in turn induces the change in distribution pattern of zooplankton species [ 3 ]. (omicsonline.org)
  • Bio-monitoring of the lake ecosystem includes the study of phytoplanktons, zooplanktons, macrophytes, macro-micro benthos and tertiary consumers. (omicsonline.org)
  • Here we combine in situ observations with an ecosystem model to show that zooplankton have an important role in regulating the efficiency of the BCP. (biogeosciences.net)
  • Marine zooplankton form a significant part of the marine ecosystem since they are relatively low on the food chain and they exist in vast quantities. (spie.org)
  • Zooplankton feed on bacterioplankton, phytoplankton, other zooplankton (sometimes cannibalistically), detritus (or marine snow) and even nektonic organisms. (wikipedia.org)
  • The method was also used to document the instantaneous slip velocity of zooplankton and the resulting differences in trajectory between zooplankton and non-inertial fluid particles in the unsteady wake flow, showing the method's capability to quantify drift for both passive and motile organisms in turbulent environments. (biologists.org)
  • Quantifying turbulent flow fields with high spatial and temporal resolution, and relating them to the behavior and distributions of organisms, e.g. zooplankton, is critical for advancing our understanding. (biologists.org)
  • Oxygen deficient sediments are rich in hydrogen sulfide which is toxic to many organisms at high concentrations [ 14 ] and potentially destroys buried zooplankton eggs. (royalsocietypublishing.org)
  • Elevated chloride concentrations threaten aquatic organisms, and zooplankton are especially sensitive. (queensu.ca)
  • Motivated by the complexity of observing small-sized aquatic organisms in experimental systems, and the difficulties related to real-time observation, sampling, and counting without interfering with the organisms, we here present a new method for observing behaviour and dispersion of non-sessile zooplankton organisms using a custom-made tank with an associated machine vision system. (biologists.org)
  • Zooplankton eat tiny single-celled organisms, including the phytoplankton that capture the sun's energy for ocean life. (scor-int.org)
  • A number of different types of zooplankton resting eggs have been described, for example, diapause and subitaneous quiescent eggs [ 15 ]. (royalsocietypublishing.org)
  • There are many different types of zooplankton that are distinct from one another. (assignmentpoint.com)
  • Seachem Reef Zooplankton, 8.5 fl. (petco.com)
  • However, to understand the mechanisms and ecological and biogeochemical consequences of the detected variations in zooplankton, species level and/or functional level breakdowns are necessary. (ices.dk)
  • Zooplanktons also have enormous ecological value as they are primary consumers of phytoplanktons, and also recycle the nutrients. (omicsonline.org)
  • With the aim to elaborate a conceptual framework that describes the main ecological factors associated with zooplankton community structure in the Upper Paraná River, we investigated the mechanisms that regulate the communities structure and their response to inter-annual and hydro-sedimentological variations in the floodplain and the biological factors associated with species abundance in those communities. (scielo.sa.cr)
  • Although zooplankton are primarily transported by ambient water currents, many have locomotion, used to avoid predators (as in diel vertical migration) or to increase prey encounter rate. (wikipedia.org)
  • Because many zooplankton species harbor high numbers of bacteria on and inside their bodies ( 17 - 19 ) and perform diel vertical migration, they are expected to move attached bacteria through the water column on a daily basis. (pnas.org)
  • Diel vertical migration in marine zooplankton may be a bi-phasic feeding strategy involving the alternate exploitation of particulate and dissolved organic material. (fisherycrisis.com)
  • An accurate model of the feeding ecology of zooplankton is critical to understanding the marine nutrient cycle, but explanations for the extensive diel vertical migration of zooplankton have failed to completely account for the observed behavior (1, 2, 3, 4, 5). (fisherycrisis.com)
  • Since zooplankton may experience diel pressure changes of 20 atm. (fisherycrisis.com)
  • Zooplankton diel vertical migration in the Corsica Channel (north-western Mediterranean Sea). (ocean-sci.net)
  • Diel vertical migration (DVM) is a survival strategy adopted by zooplankton that we investigated in the Corsica Channel using acoustic Doppler current profiler (ADCP) data from April 2014 to November 2016. (ocean-sci.net)
  • Diel vertical migration (DVM) is one of the most important survival strategies adopted by zooplankton. (ocean-sci.net)
  • Positive co-relation was found between zooplankton growth with water temperature and pH while, there growth was adversely affected with increasing alkalinity, nitrates and dissolved oxygen. (omicsonline.org)
  • The structure and assemblage of Zooplankton communities is dependent on many physic-chemical and environmental factors such as rainfall, air and water temperature, nutrient concentration and salinity of lake. (omicsonline.org)
  • For example, freshwater zooplankton with different life-history strategies, such as sexual or parthenogenetic reproduction, may respond differently to increased mean temperatures and rapid temperature fluctuations. (lu.se)
  • RNA content in zooplankton was correlated with temperature, but the relationships were nutrient-dependent, with a positive correlation in nutrient-rich ecosystems and a negative one in those with scarce nutrients. (diva-portal.org)
  • Marine zooplankton communities consist of permanent and temporary members, including the larvae of many fish and benthic invertebrates, thus acting as vehicles for population exchange and diversification. (southampton.ac.uk)
  • Everything caught in a net with a mesh size of 0,5 mm, was considered zooplankton, although it also consisted of fish larvae and sometimes fish eggs. (marinespecies.org)
  • I want to start knowing what I'm doing, though, that is why I'm asking here: since zooplankton is THE feed for fish larvae and fry you surely have plenty of experience with it. (marinebreeder.org)
  • The zooplankton prey field for rock lobster phyllosoma larvae in relat" by Christin Säwström, Lynnath E. Beckley et al. (edu.au)
  • Many animals, from single-celled Radiolaria to the eggs or larvae of herrings, crabs, and lobsters, are found among the zooplankton. (assignmentpoint.com)
  • From both viewpoints of fisheries and oceanography, zooplankton size structure is a prime important factors to determine their flux. (nii.ac.jp)
  • In the present study, both indices were applied to zooplankton communities from 16 Greek lakes, covering the entire trophic state spectrum, in order to test their application in a different climatic zone, the Mediterranean. (springer.com)
  • Zooplankton are small animals that live in the water column of almost all water bodies, including oceans, lakes and ponds, although they mostly cannot survive in rivers and streams. (iisd.org)
  • Most lakes will have 40 or more species of zooplankton common to them. (iisd.org)
  • Zooplankton occupy the centre of the open-water food web of most lakes. (iisd.org)
  • At IISD Experimental Lakes Area, our zooplankton collection now exceeds 30,000 samples. (iisd.org)
  • In recent years, many species of zooplankton have been accidentally introduced to Canadian lakes and rivers from Europe and elsewhere, including the spiny water flea ( Bythotrephes ) and the larval stages of zebra mussels . (iisd.org)
  • Occasionally, some species of zooplankton, such as Mysis , have been deliberately introduced to lakes to enhance fish production. (iisd.org)
  • While zooplankton resting stages have been intensively studied in freshwater lakes and ponds, less is known from marine systems [ 10 ]. (royalsocietypublishing.org)
  • Stable isotope analysis of zooplankton carbon nutrition in humic lakes. (lancs.ac.uk)
  • Carbon stable isotopic composition was determined for zooplankton, POM, DOM and, in two cases, phytoplankton from 12 small forest lakes in southern Finland during summer 1997. (lancs.ac.uk)
  • Therefore the zooplankton must have been feeding selectively on isotopically light food sources and doing so to a greater extent in the more humic lakes. (lancs.ac.uk)
  • Although phytoplankton were 13 C-depleted relative to POM, their abundance and their variability between lakes did not appear to explain adequately the observed trend in zooplankton stable isotope ratios. (lancs.ac.uk)
  • Changes in zooplankton community structure and function were analyzed in 24 lakes covering a wide salinity gradient (from 0.5 to 115 g l(-1)) in a semiarid region in northwest China. (au.dk)
  • Our study indicates that the ongoing salinization of lakes with climate warming will result in important changes in the zooplankton, affecting not only the structure but also the functioning of this community. (au.dk)
  • Climate change and variability have been correlated to various responses in zooplankton phenology, distribution, abundance, and composition ( 1 , 2 ), but the controlling mechanisms behind the associations are often elusive. (pnas.org)
  • In the past five years, further advances in zooplankton production assessment include the evaluation of 50 empirical models used to estimate zooplankton production, and their further application to assess zooplankton production variability within 20 ICES time-series. (ices.dk)
  • In addition, we found that ontogenetic variability in NA content of the copepod Mixodiaptomus laciniatus (intra-and interstage variability) was comparable to the interspecific variability across other zooplankton species. (diva-portal.org)
  • Vertical Migration of Zooplankton: a Bi-phasic Feeding Strategy that Enhances New Production? (fisherycrisis.com)
  • Weiwei Zhang and Min Zhao, "Dynamical Complexity of a Spatial Phytoplankton-Zooplankton Model with an Alternative Prey and Refuge Effect," Journal of Applied Mathematics , vol. 2013, Article ID 608073, 10 pages, 2013. (hindawi.com)
  • To explore this, the oceanography and corresponding zooplankton prey field along five latitudinal transects in the southeastern Indian Ocean were quantified during July 2010. (edu.au)
  • Although zooplankton abundance increased towards the north, the prey field was unevenly distributed with patches of higher prey concentration associated mainly with LCW. (edu.au)
  • Among the cyanobacterial genera, Microcystis had the largest negative effect on zooplankton population growth and there was no consistent difference between M. aeruginosa strains that produced microcystins and those that did not. (schweizerbart.de)
  • Over the course of the last 30 years, WGZE has had to adapt to the evolving demands of the time , as for example, the adoption of the Marine Strategy Framework Directive (MSFD) in 2008 as the European Union's (EU) mandate to protect the marine environment across Europe has led to increasing demand for zooplankton data. (ices.dk)
  • Zooplankton are very important to humans, because of their valuable protein and oils, worldwide demand for zooplankton are on the rise. (assignmentpoint.com)
  • Spatial and temporal distribution patterns of zooplankton in the central Baltic Sea and methods to detect them. (pangaea.de)
  • At the same time, ever reducing budgets for monitoring have driven the development of new tools and techniques for the sampling and analysis of zooplankton, including automated methods, image analysis and molecular tools. (ices.dk)
  • The overall zooplankton richness and abundance was significantly higher during the low (71 species) and flood (878.47 ind.m -3 ) period, respectively. (scielo.br)
  • Marine seismic surveys used in petroleum exploration could cause a two to three-fold increase in mortality of adult and larval zooplankton, new research published in leading science journal Nature Ecology and Evolution has found. (eurekalert.org)
  • Zooplankton results showed high densities of copepod nauplii (averaging 774.65 ± 962.9 org/L) during the first 5 days following larval stocking in ponds receiving the 250 kg/ha fertilizer rate. (auburn.edu)
  • Zooplankton and penaeid larval abundance in 1992 are compared with data collected from the same localities during the same period in the 1970s. (warwick.ac.uk)
  • At Ras Tanura, mean penaeid larval abundance was significantly lower in 1992 (0.275 m-3) than 1976 (6.77 m-3), whereas mean zooplankton abundance showed no significant change. (warwick.ac.uk)
  • At Safaniya, both mean zooplankton and penaeid larval abundance were significantly lower in 1992 (0.128 Ml M-3 and 0.009 m-3) than in 1978 (0.77 ml M-3 and 16.70 m-3). (warwick.ac.uk)
  • The prediction that diurnally migrating zooplankton acquire different attached bacterial communities from hypolimnion and epilimnion between day and night was subsequently confirmed in our field study. (pnas.org)
  • Deep-sea zooplankton communities generally have low abundances and thus, large sampling systems are needed to filter sufficient amounts of water. (mdpi.com)
  • Chitinous zooplankton communities of several bodies of water were analyzed in order to understand the interaction of the zooplankton population composition with the population dynamics of pathogenic V. cholerae and incidence of cholera. (nih.gov)
  • 84±19 fmol CH 4 copepod −1 d −1 ) dominated zooplankton communities, and (3) methane was only produced on a Rhodomonas sp. (biogeosciences.net)
  • This synthesis shows that longer exposure to cyanobacteria can shift zooplankton communities toward better-adapted species, select for more tolerant genotypes within a species, and induce traits within the lifetime of individual zooplankton. (lu.se)
  • Despite the negative effects of chloride on zooplankton and aquatic communities, current water quality guidelines are based on laboratory studies that exclude indirect effects or additional stressors that may modify tolerance to chloride. (queensu.ca)
  • As part of the process to investigate the environmental safety of neem-based insecticides, a mesocosm experiment was conducted to assess the effects of neem on natural zooplankton communities. (gc.ca)
  • Zooplankton communities were quantitatively sampled over a 4-month experiemntal period in treated and control enclosures, and water samples were collected to track azadirachtin concentrations. (gc.ca)
  • Perturbations to zooplankton communities were sufficient to cause measurable differences in system-level metabolism (midday dissolved oxygen concentrations) at all but the lowest test concentration. (gc.ca)
  • Conditions which promoted a distinct shelf-break front resulted in distinct zooplankton communities. (slideserve.com)
  • Understanding the complicated effects of climate change on zooplankton communities is thus crucial for predicting impacts on planktivorous fish, as well as consequences for energy flows and body sizes in marine systems. (uib.no)
  • Salinity shapes zooplankton communities and functional di. (au.dk)
  • Macroscopic zooplankton include pelagic cnidarians, ctenophores, molluscs, arthropods and tunicates, as well as planktonic arrow worms and bristle worms. (wikipedia.org)
  • Zooplankton play an important role in the functioning of marine ecosystems and in biogeochemical cycles, linking pelagic primary production to higher trophic levels, including commercially important fish, mammals and seabirds. (southampton.ac.uk)
  • Zooplankton lay their eggs in the pelagic zone, and some sink and lie dormant in the sediment, before hatched zooplankton return to the water column. (royalsocietypublishing.org)
  • This study demonstrated that re-oxygenation of anoxic sediments activated a large pool of buried zooplankton eggs, strengthening the benthic-pelagic coupling of the system. (royalsocietypublishing.org)
  • Differential responses among speceis (some increases, some decreases) caused detectable disruptions in community structure among zooplankton of treated enclosures. (gc.ca)
  • Differences among zooplankton species could not be explained by grazer species body lengths, even when experiments were restricted to those that used only filamentous cyanobacteria. (schweizerbart.de)
  • The physical factor that influences zooplankton distribution the most is mixing of the water column (upwelling and downwelling along the coast and in the open ocean) that affects nutrient availability and, in turn, phytoplankton production. (wikipedia.org)
  • By combining oceanographic drift models and statistical analyses of field data from 1959 to 1993 and investigating effects across trophic levels, we are able to elucidate pathways by which climate influences zooplankton. (pnas.org)
  • This method is called "biomanipulation" and is usually done by reducing predation on zooplankton by planktivorous fish either by directly removing these fish or adding a fish predator such as pike. (iisd.org)
  • and inferences about fish predation pressure on zooplankton, derived from empirical data regarding the large body sizes of species and individuals of Daphnia that occur in the reservoirs. (scielo.org.za)
  • However, research on pathogenic and nonpathogenic bacteria has shown that direct association with zooplankton has significant influences on the bacteria's physiology and ecology. (pnas.org)
  • Our research interests are in zooplankton ecology and physiology, coastal and deep-sea food webs, nutrient cycling, and marine detritus or "marine snow. (vims.edu)
  • In addition to being public health hazards, cyanobacteria have long been considered a poor quality food for key zooplankton grazers that link phytoplankton to higher trophic levels. (lu.se)
  • Increasing chloride concentrations also led to a shift in phytoplankton community composition marked by an increase in cyanobacteria, which likely contributed to the negative effects of elevated chloride on zooplankton. (queensu.ca)
  • We analyzed a large data set of laboratory experiments to examine the effects of cyanobacteria containing or lacking intracellular toxic metabolites and of different morphology on zooplankton population growth rates across multiple genera and species of cladocerans, rotifers and cyanobacteria. (schweizerbart.de)
  • Twenty-one of the 29 zooplankton species maintained positive growth rates when fed a diet containing cyanobacteria even though cyanobacteria were a poor food source for half of the zooplankton species tested relative to a diet containing only green algae and/or flagellates. (schweizerbart.de)
  • Single-celled cyanobacteria were more detrimental to a larger number of zooplankton species compared to filamentous or chroococcoid colonial cyanobacteria. (schweizerbart.de)
  • Our results highlight the large variation in species-specific responses of zooplankton to cyanobacteria. (schweizerbart.de)
  • Although cyanobacterial toxicity and mechanical interference may be important drivers in particular cyanobacteria-zooplankton interactions, we did not find general support for these mechanisms through the use of this meta-analysis. (schweizerbart.de)
  • Through their consumption and processing of phytoplankton and other food sources, zooplankton play a role in aquatic food webs, as a resource for consumers on higher trophic levels (including fish), and as a conduit for packaging the organic material in the biological pump. (wikipedia.org)
  • While much research has been carried out on mercury in large marine mammals and associated food webs in northern regions, comparatively less has been conducted on lower trophic levels including zooplankton and the subsequent transfer to predators, which marks the entry of mercury into northern marine food webs. (biomedsearch.com)
  • Zooplankton are the animal component of the planktonic community ("zoo" comes from the Greek word for animal). (wikipedia.org)
  • We, the science community, should speak out more and more to the public on the significance of zooplankton time-series observation. (ices.dk)
  • Much of our current focus is on how zooplankton community structure affects flux of organic material and cycling of nutrients in the sea. (vims.edu)
  • effects of mesoscale eddies on zooplankton community structure. (vims.edu)
  • Lipid biomarkers extracted from phytoplankton- and copepod-rich samples revealed that Dinophyceae are a major food source of the T. longicornis dominated zooplankton community, supporting the proposed link between copepod grazing, DMSP/DMSO release, and the build-up of subthermocline methane enrichments in the central Baltic Sea. (biogeosciences.net)
  • Additionally, increasing lake temperatures could exacerbate the negative effects of increasing chloride concentrations on zooplankton, possibly through changes to the phytoplankton community. (queensu.ca)
  • Concerning energy transfer within the zooplankton community, bottom-up control and high energy transfer efficiencies were observed for the western subarctic Pacific. (nii.ac.jp)
  • In the western subarctic Pacific, zooplankton community was dominated by large-sized copepod Neocalanus spp. (nii.ac.jp)
  • For vertical distribution, regional differences in zooplankton community were recognized even in the deep-sea down to 2000 m. (nii.ac.jp)
  • Vertical zonation of the zooplankton community in the central Baltic Sea in relation to hydrographic stratification as revealed by Multivariate Discriminant Function- and Canonical Analysis. (pangaea.de)
  • Many members of a zooplankton community begin their lives in estuaries where crabs, fishes, and a whole host of various invertebrates come to breed. (assignmentpoint.com)
  • The abundance and composition of zooplankton down to 3000 m depth was studied in the subtropical and tropical latitudes across the Atlantic, Pacific and Indian Oceans (35 °N-40 °S). Samples were collected from December 2010 to June 2011 during the Malaspina Circumnavigation Expedition. (mdpi.com)
  • No significant differences in abundance and zooplankton composition were found among oceans, with depth being consistently the most important factor affecting their distribution. (mdpi.com)
  • Zooplankton are commonly included in biomonitoring programs because their densities and species composition can be sensitive to changes in environmental conditions. (iisd.org)
  • 3. Understand how biotic and abiotic factors regulate zooplankton distribution and abundance at various temporal and spatial scales. (southampton.ac.uk)
  • One promising approach to understanding the many questions surrounding biodiversity of zooplankton is through DNA-based analysis. (scor-int.org)
  • This working group will facilitate global cooperation, ensure open access to data and direct comparison of results from different studies, encourage standardization of methods for applied uses in ocean assessment, and accelerate progress using novel DNA-based approaches to understand biodiversity and roles of zooplankton in ocean ecosystems. (scor-int.org)
  • Robert Campbell, a zooplankton biologist at the University of Rhode Island unassociated with the project, says researchers expect the Arctic marine growing season will lengthen under a changing climate, and with sea ice melting and thinning out earlier, zooplankton may be forced farther down in the water column to feed on other nutrients, like phytoplankton - possibly easing the detrimental effects of a warming Arctic. (upi.com)
  • Underlying mechanisms behind observed associations between zooplankton dynamics and climate are often unclear. (pnas.org)
  • The results imply how climate change might influence future feeding conditions for predators on zooplankton. (pnas.org)
  • Understand how biotic (life history strategies, behaviour, trophic interactions) and abiotic (hydrodynamics, climate) factors regulate zooplankton distribution and abundance. (southampton.ac.uk)
  • Future changes in climate such as the expansion of OMZs may decrease the role of zooplankton in the biological carbon pump globally, hence increasing its efficiency. (biogeosciences.net)
  • Zooplankton are 'rapid responders' to biological and physical conditions, and are thus useful indicators of environmental variation and climate change. (scor-int.org)
  • Zooplankton are increasingly being used as indicators for forecasting the abundance of fish and bird populations, and for tracking the impacts of climate change on ocean ecosystems. (assignmentpoint.com)
  • In turn, zooplankton are dependent on sea ice, feeding on the algae that grows on the underside of the ice. (upi.com)
  • Every spring, the algae blooms, zooplankton chow down, fatten up and then drift off into the bellies of bowhead whales and their ilk. (upi.com)
  • Without the ice algae, zooplankton may starve, and that means the whole Arctic food chain could eventually collapse. (upi.com)
  • Rather, it is the amino acids produced by the blue-green algae that supply the food web, so that zooplankton and fish can also be fed. (innovations-report.com)
  • They eat bacteria and algae that form the base of the food web and, in turn, are heavily preyed upon by fish, insects and other zooplankton. (iisd.org)
  • Because zooplankton eat algae, it has been proposed that it may be possible to control algal blooms by increasing zooplankton grazing. (iisd.org)
  • 2)You would have to feed the zooplankton some sort of unicellular free floating algae (phytoplankton)like Nannochloropsis , Tetraselmis , Isochrysis , etc. (marinebreeder.org)
  • Furthermore this study also evaluates the relationship among different zooplankton groups and abiotic factors in Bhimtal Lake. (omicsonline.org)
  • As a result, zooplankton are primarily found in surface waters where food resources (phytoplankton or other zooplankton) are abundant. (wikipedia.org)
  • We present here the first database for mercury uptake and transfer exclusively within zooplankton food webs in northern marine waters. (biomedsearch.com)
  • Zooplankton frequents the darker and cooler places in the waters. (differencebetween.net)
  • 3. Phytoplankton makes its own food through photosynthesis while zooplankton survives on other life forms in the waters. (differencebetween.net)
  • Anatomical and behavioral evidence support the hypothesis that ammonia excretion by zooplankton occurs largely in surface waters, thereby potentially providing a biological vector for the stimulation of new production. (fisherycrisis.com)
  • Zooplankton play an important role in the trophic dynamics of coral reef ecosystems. (washington.edu)
  • Some zooplankton, like many Cladocera, are indiscriminate grazers, using their feeding appendages like rakes to filter particles from the water. (iisd.org)
  • The model and observations show strongest agreement in remineralization coefficients and BCP eff at the OMZ site where zooplankton processing of particles in the mesopelagic zone is thought to be low. (biogeosciences.net)
  • Concentrations, in lipid weight, were lower in zooplankton than in suspended particles (food for zooplankton, including phytoplankton). (marinespecies.org)
  • In zooplankton samples no relation between PCBs and their lipid content was observed. (marinespecies.org)
  • It is suggested here that 'hunger' may also be the trigger for the downward migration or diving behavior in zooplankton, and that this hunger may be satisfied by the direct uptake of DOM during descent and the time spent at depth. (fisherycrisis.com)
  • Understanding the drivers and consequences of zooplankton traits, such as physiological detoxification and selective vs. generalist grazing behavior, are therefore of major importance for future studies. (lu.se)
  • It also requires a small array to minimize the proximity effects of the transducer package on the zooplankton behavior, to allow mounting of the transducer array on small remotely operated submersible vehicles and to reduce the cost of the sonar. (spie.org)
  • We suggest that improving parameterizations of zooplankton processes may increase the fidelity of biogeochemical model estimates of the biological carbon pump. (biogeosciences.net)
  • Microorganisms and zooplankton are both important components of aquatic food webs. (pnas.org)
  • coarse prefilters at intake "house" escape opening for animal's exit head tail excurrent opening fine food gathering filters mouth 304 IDENTIFICATION AND BIOLOGY OF COMMON ZOOPLANKTON eral weeks. (jhu.edu)
  • 5. Understand the mechanisms by which herbivorous, omnivorous and carnivorous zooplankton detect, select, and ingest their food. (southampton.ac.uk)
  • Mercury Biomagnification in Marine Zooplankton Food Webs in Hudson Bay. (biomedsearch.com)
  • As a result of their central position in lake food webs, zooplankton can strongly affect water quality, algal densities, fish production, and nutrient and contaminant cycling. (iisd.org)
  • Zooplankton depends on the phytoplankton and other particulate matter that is found in the water for food. (differencebetween.net)
  • Phytoplankton is the chief food source for the zooplankton! (differencebetween.net)
  • Corals are the main target for the zooplankton, but the live food will probably be very much appreciated by the fish too. (marinebreeder.org)
  • A: We do not have a specific copepod food, but we do have Reef Zooplankton and Reef Phytoplankton that can be used for feeding purposes. (seachem.com)
  • Zooplankton are one of the basic elements of the marine food web. (assignmentpoint.com)
  • Discovering the new through scrutiny of the old: Sanae Chibae presents the Odate Collection and future of zooplankton monitoring in the global observation initiatives at the ICES/PICES Zooplankton Production Symposium. (ices.dk)
  • Created in 1991, ICES Working Group on Zooplankton Ecology continues today with the same drive. (ices.dk)
  • Separate determination of isotope ratios for the main zooplankton species allowed a more detailed trophic investigation. (mpg.de)
  • Azeiteiro UMM, Marques JC, Ré P (1999) Zooplankton annual cycle in the Mondego river estuary (Portugal). (springer.com)