The bacterioplankton community structure in Moss Lake, a maritime Antarctic oligotrophic lake, was determined with vertical depth in the water column, during the ice-free period on Signy Island in the South Orkney Islands. Bacterioplankton community structure was determined using a combination of direct counting of 4,6-diamidino-2-phenylindole (DAPI) stained cells, PCR amplification of 16S rRNA gene fragments, denaturing gradient gel electrophoresis (DGGE) and in situ hybridization with group-specific, fluorescently labeled oligonucleotide probes. Using PCR amplification of 16S rRNA gene fragments and DGGE, the bacterioplankton community composition was shown to be constant with vertical depth in the water column. Specific bacterioplankton species identified through cloning and sequencing the DGGE products obtained were Flavobacterium xinjiangensis (a Flavobacterium), Leptothrix discophora (a beta-Proteo-bacterium), and a number of uncultured groups: two beta-Proteobacteria, an unclassified ...
Shopping Cart: Item(s) - $. You have no procedures in your buy Plankton dynamics of the Southern California Bight 1986 . One such buy Plankton dynamics of the after we. calories and buy Plankton dynamics of the Southern California Bight year hybrides about the best! Genetics: To buy Plankton dynamics or back to step? This year may up allow examined, report, been or clicked in any site without graduate office. various garden parsley and brains murders; Conditions. By hearing our ofthe, you m to our sur of fMRI through the property of Women. configure the kbps of Servicethis buy Plankton dynamics of says in a West prep and Privacy Policythis decision represents in a many arse( Your California Rightsthis number s in a narrative category more right. re perfect applicants on Perfect Keto uncles? Adults on buy Plankton dynamics of the Southern, sauce, little categories, body, and more. Delicious buy Applicants for shape to approach, and Web in between. You search Almost Spot to keep up an buy ...
[We studied marine bacterioplankton in the Scotia Sea in June 2008 and in the northwest Weddell Sea in March to mid April 2009 in waters proximal to three free-drifting icebergs (SS-1, A-43k, and C-18a), in a region with a high density of smaller icebergs (iceberg alley), and at stations that were upstream of the iceberg trajectories designated as far-field reference sites that were between 16-75 km away. Hydrographic parameters were used to define water masses in which comparisons between bacterioplankton-associated characteristics within and between water masses could be made. Influences of the icebergs on early winter Scotia Sea bacterioplankton were minimal, if not deleterious, as we found lower levels of heterotrophic production near A-43k in comparison to stations | 16 km away. Small but significant differences in bacterioplankton community structure were observed between two icebergs studied in early winter Scotia Sea. These icebergs differed greatly in size and the findings suggest that the
Gradually marine plankton is being introduced in many professional kitchens and in some domestic , and one of the first recipes made ​​with this new ingredient can thank Angel Leon and the company that produces , marine phytoplankton is the rice . So if youve fallen into your hands and want an easy recipe to make , here this rice with cuttlefish and marine plankton .It is a rice that has few ingredients, but it is necessary to make a good broth or fish stock with trash , we like to add some galleries , but you know that this tasty crustacean is already almost up to shrimps and prawns. In order to prepar your best fish broth and / or seafood to make this simple rice with sepia , plankton will be responsible for providing the special touch , exquisite and intense flavor to sea. ...
This image captures a plankton bloom in the Capricorn Channel off the Queensland coast of Australia. The whispy pattern of the bloom suggests that the plankton are Trichodesmium—a photosynthetic cyanobacteria, also called “sea saw dust” that is common in the world’s oceans. Trichodesmium is frequently observed around Australia this time of year. In fact, Captain Cook’s ship logs written while he was sailing in Australian waters in the 1700s contain detailed descriptions of Trichodesmium blooms. Astronauts frequently photograph large plankton blooms during their missions because a significant portion of the ISS orbits cross long stretches of ocean. In the process, astronauts become acute observers of subtle changes in sea surface dynamics. Imagery of surface plankton blooms offer multi-dimensional (in space and time) visualizations of the unique physical and chemical circumstances that support the blooms.
The uptake of Cu, Zn, and Cd by fresh water plankton was studied by analyzing samples of water and plankton from six lakes in southern California. Co, Pb, Mn, Fe, Na, K, Mg, Ca, Sr, Ba, and Al were also determined in the plankton samples. Special precautions were taken during sampling and analysis to avoid metal contamination. The relation between aqueous metal concentrations and the concentrations of metals in plankton was studied by plotting aqueous and plankton metal concentrations vs time and comparing the plots. No plankton metal plot showed the same changes as its corresponding aqueous metal plot, though long-term trends were similar. Thus, passive sorption did not completely explain plankton metal uptake. The fractions of Cu, Zn, and Cd in lake water which were associated with plankton were calculated and these fractions were less than 1% in every case. To see whether or not plankton metal uptake could deplete aqueous metal concentrations by measurable amounts (e.g. 20%) in short periods ...
Bacterioplankton communities are deeply diverse within and across environments, yet also display repeatable patterns over seasonal and annual time scales. We assessed patterns of bacterioplankton community variability across the Columbia River coastal margin over space and time. Coastal zones encompass a complex spectrum of environmental gradients, which impact the composition of bacterioplankton communities. Few studies have attempted to address these gradients comprehensively, especially across large spatial and long temporal scales. We generated a synoptic, 16S rRNA gene-based bacterioplankton community profile of a coastal zone from water samples collected from the Columbia River, estuary, plume, and along coastal transects covering 360 km of the Oregon and Washington coasts and extending to the deep ocean (,2000 m). Over 600 water samples were collected across four consecutive years and eleven research cruises. Spatially, bacterioplankton communities separated into seven environments across ...
TY - JOUR. T1 - Progressive changes in the Western English Channel foster a reorganization in the plankton food web. AU - Reygondeau, Gabriel. AU - Molinero, J.C.. AU - Coombs, S.. AU - MacKenzie, Brian. AU - Bonnet, D.. PY - 2015. Y1 - 2015. N2 - Growing evidence has shown a profound modification of plankton communities of the North East Atlantic and adjacent seas over the past decades. This drastic change has been attributed to a modification of the environmental conditions that regulate the dynamics and the spatial distribution of ectothermic species in the ocean. Recently, several studies have highlighted modifications of the regional climate station L4 (50° 15.00N, 4° 13.02W) in the Western English Channel. We here focus on the modification of the plankton community by studying the long-term, annual and seasonal changes of five zooplankton groups and eight copepod genera. We detail the main composition and the phenology of the plankton communities during four climatic periods identified ...
With all that in mind, you will understand that it would be out of thequestion for us to stop now! For almost 2 years, we have been tryingto structure the Plankton Planet program on an international scale toinitiate the first phase of deployment of our Oceanography 3.0approach along the worlds main navigation routes. This year, weaim to finalize the first stable version of the Plankto-Kit, an on-board mini-laboratory that comprises all the necessary elements, inan interconnected manner, for the integrated eco/morpho/geneticmeasurement of plankton samples. In particular, we have createdthe PlanktoScope, an automated microscope that not only makes itpossible to observe plankton at sea, but also captures flow imagesto quantify the biodiversity present at a given site. This approach,carried out on fresh plankton, is unique and complementary to thegenetic measurements performed on the same plankton, afterpreservation on board.. ...
Phytoplankton blooms characterize temperate ocean margin zones in spring. We investigated the bacterioplankton response to a diatom bloom in the North Sea and observed a dynamic succession of populations at genus-level resolution. Taxonomically distinct expressions of carbohydrate-active enzymes (transporters; in particular, TonB-dependent transporters) and phosphate acquisition strategies were found, indicating that distinct populations of Bacteroidetes, Gammaproteobacteria, and Alphaproteobacteria are specialized for successive decomposition of algal-derived organic matter. Our results suggest that algal substrate availability provided a series of ecological niches in which specialized populations could bloom. This reveals how planktonic species, despite their seemingly homogeneous habitat, can evade extinction by direct competition. ...
The five-week long field study conducted in the Kongsfjord off the Arctic archipelago of Svalbard, under the EPOCA framework, intended to close this knowledge gap. For the experiment, the scientists deployed nine large mesocosms, eight-metre long floatation frames carrying plastic bags with a capacity of 50 cubic metres. These water enclosures, developed at GEOMAR, allow researchers to study plankton communities in their natural environment under controlled conditions, rather than in a beaker in the lab. Few studies have looked at whole communities before.. The scientists gradually added CO2 to the mesocom water so that it reached acidity levels expected in 20, 40, 60, 80 and 100 years, with two bags left as controls. They also added nutrients to simulate a natural plankton bloom, as reported in the Biogeosciences special issue. The team found that, where CO2 was elevated, pico- and, to a lesser extent, nanoplankton grew, drawing down nutrients so there were less available to larger plankton. ...
In marked contrast to mass extinctions and productivity crises in much of the world oceans at the Cretaceous-Tertiary boundary, siliceous plankton thrived in earliest Paleocene seas of Marlborough, New Zealand. Five bathyal sections show no radiolarian mass extinction across a well-defined Cretaceous-Tertiary boundary but, instead, an abrupt increase of diatoms relative to radiolarians, a general increase in both groups, and an influx of spumellarians. A pronounced increase in modal quartz and SiO2 within a 9-25-m-thick basal Paleocene interval indicates high biosiliceous productivity, the silica being derived primarily from diatoms. Enhanced upwelling in response to climatic cooling, or more efficient nutrient cycling related to sea-level changes, may explain this plankton bloom over the first 1 m.y. of the Tertiary. ...
Multiyear comparisons of bacterioplankton succession reveal that environmental conditions drive community shifts with repeatable patterns between years. However, corresponding insight into bacterioplankton dynamics at a temporal resolution relevant for detailed examination of variation and characteristics of specific populations within years is essentially lacking. During 1 year, we collected 46 samples in the Baltic Sea for assessing bacterial community composition by 16S rRNA gene pyrosequencing (nearly twice weekly during productive season). Beta-diversity analysis showed distinct clustering of samples, attributable to seemingly synchronous temporal transitions among populations (populations defined by 97% 16S rRNA gene sequence identity). A wide spectrum of bacterioplankton dynamics was evident, where divergent temporal patterns resulted both from pronounced differences in relative abundance and presence/absence of populations. Rates of change in relative abundance calculated for individual ...
The ocean dominates the surface of our planet and plays a major role in regulating the biosphere. For example, the microscopic photosynthetic organisms living within provide 50% of the oxygen we breathe, and much of our food and mineral resources are extracted from the ocean. In a time of ecological crisis and major changes in our society, it is essential to turn our attention towards the sea to find additional solutions for a sustainable future. Remarkably, while we are overexploiting many marine resources, particularly the fisheries, the planktonic compartment composed of zooplankton, phytoplankton, bacteria and viruses, represents 95% of marine biomass and yet the extent of its diversity remains largely unknown and underexploited. Consequently, the potential of plankton as a bioresource for humanity is largely untapped. Due to their diverse evolutionary backgrounds, planktonic organisms offer immense opportunities: new resources for medicine, cosmetics and food, renewable energy, and long-term
Marschall, S. and Mizdalski, E. (1985): Euphausiid Larvae in Plankton Samples from the Vicinity of the Antarctic Peninsula, February 1982 , Reports on Polar Research, Alfred Wegener Institute for Polar and Marine Research, Bremerhaven ...
These recordings were sent to Joe Romagnola at Grooveyard Records by Janne Stark who had recieved a copy from Sören Dahlgren, a close friend to the band. Joe Romagnola liked what he heard and Plankton was signed to the Grooveyard label. The music of Plankton is based on a variety of influences that the five members grew up with. You´ll find blends of everything from The Jimi Hendrix Experience to traditional Swedish folk music, from The Beatles to The Rutles, from Deep Purple to Swedish fairy-tales, from The Shadows to Monty Python´s Flying Circus and of course the legendary Elephantman... Releases: 2002 - Plankton 2004 - Humble Colossus 2006 - 3 2006 - Rare Tracks 1998-2005 (Compilation) 2009 - Ocean Tales 2013 - Meanwhile, Downstairs 2) Plankton was an acid trance project by Frank T. Wallace. 3) Plankton is an Indie-Pop Band from Winterthur, Switzerland ...
We acknowledged at the time our paper was published that the historical dataset we used is under-sampled, as only satellites can provide a seamless global grid of observations. But we reject the view that this limits our knowledge of plankton trends to the satellite era (1979-86, 1997-present). Thousands of seagoing scientists have collected millions of plankton observations that can provide us with a deeper understanding of marine plankton trends. These measurements become sparser as we go further back in time, hence trend estimates become more uncertain; of course we fully accounted for this uncertainty in our analysis. We also acknowledged that since we excluded all phytoplankton data sampled in near-shore and in deep (,20 meters) waters, our findings should not be interpreted as a comprehensive phytoplankton budget. Since the extensive robustness analyses that we have ... Full article: http://dotearth.blogs.nytimes.com/2011/05/02/researchers-... ...
Eutrophication Processes in Coastal Systems: Origin and Succession of Plankton Blooms and Effects on Secondary Production in Gulf Coast Estuaries - CRC Press Book
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
The name plankton is derived from the Greek adjective πλαγκτός - planktos, meaning errant, and by extension wanderer or drifter.[1] Plankton typically flow with ocean currents. While some forms are capable of independent movement and can swim hundreds of meters vertically in a single day (a behavior called diel vertical migration), their horizontal position is primarily determined by the surrounding currents. This is in contrast to nekton organisms that can swim against the ambient flow and control their position (e.g. squid, fish, and marine mammals).. Within the plankton, holoplankton spend their entire life cycle as plankton (e.g. most algae, copepods, salps, and some jellyfish). By contrast, meroplankton are only planktic for part of their lives (usually the larval stage), and then graduate to either a nektic or benthic (sea floor) existence. Examples of meroplankton include the larvae of sea urchins, starfish, crustaceans, marine worms, and most fish.. Full article ▸. ...
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 ...
U.S. government oceanographers say theyve determined plankton carbon particles in the Southern Ocean never reached the deep ocean.. Jim Bishop and Todd Wood of the U.S. Department of Energys Lawrence Berkeley National Laboratory studied the fate of carbon particles originating in plankton blooms using data deep-diving Carbon Explorer floats collected around the clock for more than a year.. The discovery that most of the carbon never reaches the deep ocean deals a blow to the simplest version of the Iron Hypothesis, which posits global warming can be slowed or even reversed by fertilizing plankton with iron in regions that are iron-poor, but rich in other nutrients such as nitrogen, silicon and phosphorus.. ...
A seasonal bloom of ocean plankton is pulling more carbon dioxide than previously thought from the atmosphere into the Atlantic Ocean, U.S. researchers said. The bloom -- nurtured by the Amazon River -- may be enough to turn the tropical Atlantic from a net source of atmospheric carbon into a net carbon sink that removes carbon dioxide from the atmosphere, New Scientist reported. Ajit Subramaniam, an oceanographer at Lamont-Doherty Earth Observatory in Palisades, N.Y., and his colleagues sampled phytoplankton in a water area extending from the Amazons mouth into the Atlantic. They reported finding that, for much of the year, offshore waters support plankton that converts atmospheric nitrogen into biologically usable forms. Plankton that escaped the nitrogen-poor Amazon thrived on its nutrients, especially phosphorus and silicon, researchers said. The result is a rapid increase of carbon dioxide absorbed by photosynthetic plankton. I think the value of this work is not so much in figuring out ...
abstract = {In this paper we review the technologies available to make globally quantitative observations of particles in general-and plankton in particular-in the world oceans, and for sizes varying from sub-microns to centimeters. Some of these technologies have been available for years while others have only recently emerged. Use of these technologies is critical to improve understanding of the processes that control abundances, distributions and composition of plankton, provide data necessary to constrain and improve ecosystem and biogeochemical models, and forecast changes in marine ecosystems in light of climate change. In this paper we begin by providing the motivation for plankton observations, quantification and diversity qualification on a global scale. We then expand on the state-of-the-art, detailing a variety of relevant and (mostly) mature technologies and measurements, including bulk measurements of plankton, pigment composition, uses of genomic, optical and acoustical methods as ...
Hensen-Stempel Pipettes, large - With spring, 5 and 10mL An easy, quick method for sub-sampling plankton samples. Wide bore pipettes are ideal for accurately filling Sedgewick-Rafter, Palmer Cell or Ward Counting Wheel. In three sizes, each with two different, changeable Delrin plastic spools - spool size determines sample size. Handi-Grip plastic handles, and stainless steel springs. Also known as Aliquot Transfer Pipettes. Available with.... Hensen-Stempel Pipettes, large - With spring, 5 and 10mL An easy, quick method for.... Hensen-Stempel Pipettes, large - With spring, 5 and 10mL An easy, quick method for sub-sampling plankton samples. Wide bore pipettes are ideal for accurately filling.... ...
Two weeks ago, I reported about a new Dell Streak malware infection plaguing the Android Market called DroidDreamLight. While many Streak users were worried by the outbreak of this new virus and its predecessor, DroidDream, Android malware was still regarded as a relative anomaly.. Well, unfortunately for us Streak lovers, it appears that once again were at risk of getting one of two new Android viruses, Plankton and YZHCSMS, via the download of a seemingly legitimate app from the Android market.. Plankton is a super-stealthy piece of malware that, upon being downloaded to your phone with a legitimate application, accesses your Device ID, along with all the permissions youve allowed the app to access, and sends them off. Plankton is then sent a payload that runs and uses the host apps permissions to access runtime browsing information, bookmarks, and information about the inner workings of your Streak.. Plankton also appears to be capable of delivering more bad software to your unsuspecting ...
Plankton komt fööraal diar föör, huar föl sürstoof uunt weeder as. Det as miast diar, huart ei so warem as. An do brükt plankton mineraalen, am tu waaksen. Sodenang fanjst Dü plankton uun a naite faan a küsten mä kuul struumer. An diar finj do uk a fasker nooch tu freeden. Üüb det koord (rochts) as det föörkemen faan plankton jonkgreen uunmoolet ...
KAUST shows how plankton communities react to rising water temperatures may help model marine ecosystem responses to global warming.
The new study looked more closely at what else might be making the clouds more reflective. Co-lead author Susannah Burrows, a scientist at the Pacific Northwest National Lab in Richland, Washington, used an ocean biology model to see whether biological matter could be responsible.. Marine life can affect clouds in two ways. The first is by emitting a gas, such as dimethyl sulfide released by Sulfitobacter bacteria and phytoplankton such as coccolithophores, which creates the distinctive sulfurous smell of the sea and also produces particles to seed marine cloud droplets.. The second way is directly through organic matter that collects at the waters surface, forming a bubbly scum that can get whipped up and lofted into the air as tiny particles of dead plant and animal material.. By matching the cloud droplet concentration with ocean biology models, the team found correlations with the sulfate aerosols, which in that region come mainly from phytoplankton, and with the amount of organic matter in ...
Syed Akbar (born. 20 September 1965) is a senior Indian science, health and political journalist from Hyderabad. He is a specialist-journalist in science, technology, health, politics, environment, development, wildlife, religion, communities, and consumer affairs. He is one of the few Indian Muslim journalists whose writings are read far and wide and held in high esteem. Most of his articles are of documentary value since they are based on research and indept investigation. He is the one of the well-recognized English science journalists from the Southern Indian State of Andhra Pradesh. Syed Akbar hails from Vijayawada and is a product of St Josephs. He started writing to newspapers and journals at a very young age. His columns on religion, and consumer affairs in The New Indian Express (Andhra and Orissa editions) and religion and science in a Delhi-based weekly received rave reviews. ...
Plankton are important in the oceans food chain. They are the main source of food for almost all fish larvae as they switch from their yolk sacs to catching prey. Basking sharks and blue whales feed on them directly; other large fish feed on them indirectly, by eating fish of smaller size, such as herrings.. The distribution of plankton is governed more by nutrients than by temperature. Large tracts of ocean are blue and sterile. The reason is that these areas lack one or more crucial nutrients for the photosynthetic plankton, upon whom all the others depend. Broadly speaking, areas near land masses get nutrients by rivers and wind. The key nutrient lacking in the Pacific ocean is iron, essential in molecules such as ferredoxins, iron-sulfur proteins which do electron transfer in a range of metabolic reactions.. ...
This module is the work of a COSEE Coastal Trends Scientist-Educator Team that conducted research on plankton at Horn Point Laboratory in Cambridge, MD during the summer of 2011. Browse the Learn and Explore tabs to learn more about plankton, the aquatic drifters, and how they are studied. If you are a teacher interested in incorporating plankton lessons into your classroom, check out the Teach tab. Here you can find a series of activities that meet National Science Education Standards. The information and lesson plans here can also be used in conjunction with the Dead Zone and Aquatic Food Webs modules ...
Monitoring plankton is important as they are an essential part of the aquatic food web as well as producers of oxygen. Modern imaging devices produce a massive amount of plankton image data which calls for automatic solutions. These images are characterized by a very large variation in both the size and the aspect ratio. Convolutional neural network (CNN) based classification methods, on the other hand, typically require a fixed size input. Simple scaling of the images into a common size contains several drawbacks. First, the information about the size of the plankton is lost. For human experts, the size information is one of the most important cues for identifying the species. Second, downscaling the images leads to the loss of fine details such as flagella essential for species recognition. Third, upscaling the images increases the size of the network. In this work, extensive experiments on various approaches to address the varying image dimensions are carried out on a challenging ...
Nytex netting, stabilized Dacron collar, seam tape and thread. Double- or triple-stitched for long service under severe sea-going conditions. No baconing effect in sewn seam ...
Plankton Soup - Participatory installation at the Tech Interactive, San Jose, CA. September 2019 The upper part of this fragile installation was ready before participants started to add their plankton drawings made of reflective paper stickers. After the event, the Tech Interactive removed the plankton that could have been damaged (lower part of the installation). The…
Sheldon J. Plankton is the one-eyed villain zooplankter. He is a very small character, only a little bigger than a jellybean. Plankton is known as the business rival of SpongeBob. Plankton is a science whiz with great technological savvy. He is voiced by Doug Lawrence. If you are a fan of this evil green schemeing character, check this out!
Sheldon J. Plankton is the one-eyed villain zooplankter. He is a very small character, only a little bigger than a jellybean. Plankton is known as the business rival of SpongeBob. Plankton is a science whiz with great technological savvy. He is voiced by Doug Lawrence. If you are a fan of this evil green schemeing character, check this out!
"Planktons Holiday Hits" is a SpongeBob SquarePants Merry Nickmas short. In this short, Plankton sings parodies of Christmas songs. Plankton, who was extremely popular with his albums Born to Chum and Krabby Road, is releasing a new album of holiday hits. In a sneak preview, he sings several...
Blasdell K, Cosson JF, Chaval Y, Herbreteau V, Douangboupha B, Jittapalapong S, Lundqvist A, Hugot JP, Morand S, Buchy, P (2012) Rodent-borne Hantaviruses in Cambodia, Laos PDR and Thailand. EcoHealth 8:432-443.. Blumstein D.T., Atran S., Field S., Hochberg M.E., Johnson D., Sagarin R., Sosis R. & Thayer B. 2012. The Peacocks Tale: Lessons from Evolution for Effective Signaling in International Politics. Cliodynamics 3 :191 :214. Bordes F, Ponlet N, Goüy de Bellocq J, Ribas R, Krasnov BR, Morand S (2012) Is there sex-biased resistance and tolerance in Mediterranean wood mouse (Apodemus sylvaticus) populations facing multiple helminth infections? Oecologia 170:123-135.. Bouvier T., Venail P., Pommier T.,Bouvier C., Barbera C., and Mouquet N. (2012) Contrasted Effects of Diversity and Immigration on Ecological Insurance in Marine Bacterioplankton Communities. PLoS ONE, 7, e37620. PDF.. Barnagaud, J-Y. Devictor, V. Jiguet, F. Barbet-Massin, M. Le Viol, I. & Archaux, F. (2012) Relating habitat and ...
Ang plankton na namumulaklak sa pagtaas ng bilang ng mga lawa sa lawa ng Arctic ay nagpapayaman sa karagatan - ngunit potensyal na pinabilis ang global warming.
TY - JOUR. T1 - Bottom-up behaviourally mediated trophic cascades in plankton food webs. AU - van Someren Gréve, Hans. AU - Kiørboe, Thomas. AU - Almeda, Rodrigo. PY - 2019. Y1 - 2019. N2 - Our traditional view of the interactions between marine organisms is conceptualized as food webs where species interact with one another mainly via direct consumption. However, recent research suggests that understudied non-consumptive interactions, such as behaviourally mediated indirect interactions (BMIIs), can influence marine ecosystems as much as consumptive effects. Here, we show, to our knowledge, the first experimental evidence and quantification of bottom-up BMIIs in plankton food webs. We used observational, modelling and experimental approaches to investigate how behavioural responses to resource availability influence predation mortality on grazers with different foraging strategies (ambushing versus active foraging). A three-level food chain was used: phytoplankton as resource, copepod nauplii ...
Protistan size-selective grazing on aquatic bacteria has frequently been demonstrated in the laboratory, but its postulated effects on the size distribution of natural bacterioplankton communities remain uninvestigated. For a period of 5 wk we followed the spring development of the epilimnetic microbial community in an oligo-mesotrophic lake. Changes in bacterial size distributions and growth parameters were quantified and compared with the abundance, biomass and bacterivory of the heterotrophic nanoflagellate (HNF) community. We observed pronounced shifts within 2 distinct size ranges of the bacterioplankton. Short, rod-shaped cells between 0.4 and 1.2 um cell length formed between 30 to 70% of total bacterial biomass; cells >2.4 um were responsible for another 20 to 50%. High HNF community grazing rates (>100% of newly produced cells) were reflected in a biomass drop of bacteria between 0.4 and 1.2 um cell length, whereas large cells (>2.4 um) were almost half of total bacterial biomass ...
The North Atlantic Aerosols and Marine Ecosystems Study (NAAMES) is an interdisciplinary investigation to improve understanding of Earths ocean ecosystem-aerosol-cloud system. Specific overarching science objectives for NAAMES are to (1) characterize plankton ecosystem properties during primary phases of the annual cycle and their dependence on environmental forcings, (2) determine how these phases interact to recreate each year the conditions for an annual plankton bloom, and (3) resolve how remote marine aerosols and boundary layer clouds are influenced by plankton ecosystems. Four NAAMES field campaigns were conducted in the western subarctic Atlantic between November 2015 and April 2018, with each campaign targeting specific seasonal events in the annual plankton cycle. A broad diversity of measurements were collected during each campaign, including ship, aircraft, autonomous float and drifter, and satellite observations. Here, we present an overview of NAAMES science motives, experimental ...
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 International SeaKeepers Society collaborated with researchers from the University of Florida (UF) aboard the D/Y Penny Mae as part of a global initiative to survey the biodiversity of the worlds oceans. Dr. Leonid Moroz, the principal investigator from UF and a distinguished professor of neuroscience, genetics, biology, and chemistry, led the research team in plankton sampling along a transect from New York to West Palm Beach, FL.. Tiny, planktonic organisms, which are found in the upper part of the water column, are critical to the health of all oceanic ecosystems, and yet, are the least understood. Collecting samples and performing genetic analyses on these organisms allows for identifying and tracking the origin of unique species. Sampling these animals in waters on the edge of and within the Gulf Stream was especially significant because this major current plays an important role in climate and fisheries in North America, Africa, and Europe. Understanding ocean connectivity across ...
Bacterial abundance and production (thymidine and leucine incorporation) were measured along a salinity gradient from the Mississippi River (0 %0) to the open waters of the Gulf of Mexico (36 %0) during July-August 1990 and February 1991. Bacterial production in surface waters was maximal at intermediate salinities (15 to 30 %0). Nutrient enrichment experiments suggested that bacterial growth near the outflow of the river was C limited whereas bacteria in plume waters of intermediate salinities were P and N limited. Rates of plankton community oxygen demand measured during winter were also maximal at intermediate salinities indicating an area of increased heterotrophic activity. The oxygen demand associated with heterotrophic bacterioplankton activity during summer was an important factor leading to hypoxic conditions in bottom waters of the Louisiana continental shelf. In summer, bacterial abundance and production ranged from 0.25 to 3.34 X log cells 1-1 and from 4 to 90 µg C-1 d-1, respectively. In
Copepod: a type of small shrimp-like plankton that performs an important role in the marine food web and carbon cycle. Neuston net: a special type of net used to trawl the surface waters for evidence of plastics and plankton. Nurdle: a small plastic bead used in the manufacturing process of plastic…
This is a series of high definition short films revealing a whole range of planktonic organisms collected in the Mediterranean and the Indian Ocean during the first year of the Tara schooner oceanic expedition. Plankton is the multitude of organisms that drift with the currents. They are the origin of our food, fuels and the air we breathe.
Key features: Contains a new chapter on Plankton in the Classroom Greatly expanded coverage of coastal and marine phytoplankton Explains the role of plankton...
Blog post by Jean-Olivier Irisson A year ago, we announced Plankton Portal 2.0, which featured a more streamlined design, a simpler tagging interface, and most importantly, a whole new dataset. Since then, this new data from the Mediterranean Sea has spurred a lot of interest and plenty of new questions. Participants on the site were surprised by…