Longitudinal processes in Salto Grande Reservoir (Americana, SP, Brazil) and its influence in the formation of compartment system. (1/46)

Studies on the longitudinal processes in reservoirs, involving physical, chemical and biological processes have been thoroughly appraised, suggesting the existence of a longitudinal organization controlled by the entrance and circulation of water which inserts modifications in the structuring of the system. To evaluate this effect, the Salto Grande reservoir (Americana, SP) was analyzed in 11 sampling stations in its longitudinal axis, in the rainy and dry seasons of 1997 considering the physical chemical and biological variables. Analyzing the results in agreement with the declining concentration degree of the river-barrage direction, a more significant correlation was verified in the dry period for total phosphorus (r2 = 0.86), dissolved total phosphate (r2 = 0.83), nitrite (r2 = 0.93), inorganic phosphate (r2 = 0.89), ammonium (r2 = 0.84) and suspended material (r2 = 0.85). In the rainy period, only nitrite (r2 = 0.90) and conductivity (r2 = 0.89) presented correlation with the distance of the dam, which demonstrates the effects of precipitation and the operational mechanism of the dam, as well as the distinction among the physical (sedimentation), chemical (oxidation) and biological (decomposition) processes in spatial heterogeneity of the system. These factors were decisive in the organization of these communities, with higher occurrence of rotifers and copepods in relation to cladocerans, the first ones being more abundant in the entrance of the Atibaia river, decreasing towards the dam direction, while copepods presented an inverse pattern. A distribution pattern similar to Copepoda was also verified for the Cladocera, evidencing a tendency to increase the density of organisms in the stations distant to the entrance of the Atibaia river, not being registered, however, a distribution gradient in the longitudinal axis, as observed for rotifers and copepods. In relation to the trophic degree a longitudinal gradient was also verified from eutrophic to oligotrophic depending on the location of the sampling station in relation to the longitudinal axis and period of analysis. The differences obtained, relating to the distribution of the environmental variables, demonstrate a characteristic pattern for reservoirs, with a longitudinal gradient in the sense river-barrage that inserts changes in the physical and chemical composition of the water, contributing to the differentiated establishing of biological communities.  (+info)

Composition and abundance of zooplankton in the limnetic zone of seven reservoirs of the Paranapanema River, Brazil. (2/46)

The species composition and abundance of the zooplankton community of seven reservoirs of the Paranapanema River, located between 22 degrees 37'-23 degrees 11'S and 48 degrees 55'-50 degrees 32'W, were analysed over four periods, in the year of 1979. The zooplankton community was composed of 76 species of Rotifera, 26 species of Cladocera and 7 species of Copepoda. For a large part of the period under study the Rotifera were dominant, followed by Copepoda. The Piraju and Salto Grande reservoirs, which occupy intermediate positions in the cascade of reservoirs, were richest in species, most of them belonging to Rotifera and Cladocera. In the reservoirs Rio Pari and Rio Novo, lateral to the cascade of reservoirs, a lower species richness was observed, although higher densities of organisms were found than in the other reservoirs located in the main river body. Different rotifer species occurred in succession, being abundant in different periods, with no defined pattern. Among the copepods, Thermocyclops decipiens predominated in the majority of the reservoirs. Ceriodaphnia cornuta was the most abundant cladoceran in the intermediate reservoirs of the cascade, and Daphnia gessneri, Bosminopsis deitersi and Moina minuta, in the reservoirs lateral to the cascade. The most frequent zooplankton species were Notodiaptomus conifer, Thermocyclops decipiens, Ceriodaphnia cornuta cornuta and C. cornuta rigaudi, Daphnia gessneri, Bosmina hagmanni, Keratella cochlearis and Polyarthra vulgaris. Some relationships were found between the trophic state of the reservoirs and the zooplankton community.  (+info)

Cladocera Chydoridae of high altitude water bodies (Serra da Mantiqueira), in Brazil. (3/46)

The diversity of species of Cladocera, Chydoridae in the water bodies belonging to the water management unity of Serra da Mantiqueira, was studied inside the BIOTA/FAPESP Program. A total of 21 water bodies were analyzed and the sampling was carried out between 9th and 11th September, 1999. Horizontal and vertical net hauls were taken at littoral and limnetic region in each lake. Most water bodies in Serra da Mantiqueira unity are small, shallow, and densely colonized by macrophytes. Most species of Cladocera found belong to the Chydoridae family, being typical inhabitants of the littoral zone, living associated with macrophytes. A total of 12 species were found, 9 of the subfamily Aloninae and 3 Chydorinae. In more than half of the water bodies the relative abundance of chydorids reached 100%, and they were dominant in most of the others, with few exceptions. Alona rustica was the most frequent species, occurring in 62% of the water bodies. The results evidenced the importance of the littoral zone as propitious habitats for the species of Chydoridae and contributing significantly to the diversity of Cladocera as a whole.  (+info)

Population growth and development of two species of Cladocera, Moina micrura and Diaphanosoma birgei, in laboratory. (4/46)

The objective of the present work was to investigate the influence of four diets on population growth, development, total length, dry weight, and nutritional value of two zooplanktonic species, Moina micrura and Diaphanosoma birgei. The four dietary treatments were: algae alone (A); algae + vitamins (AV); algae + ration (AR); and algae + ration + vitamins (ARV). Growth rate peak for both species occurred faster with AV treatment. In general, AV treatment for M. micrura showed better results for intrinsic rate, fecundity, and embryonic and post-embryonic development. On the other hand, longevity and total spawning number were better with AR treatment (p < 0.05). Vitamin and ration treatments produced the best results in D. birgei species (p < 0.05). The highest percentage of protein and lipids for both cladocerans was verified for ration treatments. Carbohydrate was higher for the treatment containing algae alone (p < 0.05). Generally, diets containing ration and vitamin showed better results in cladocerans development, with water quality adequate for culture systems. Ration and vitamin diets may also be used in high-density cultures in the laboratory.  (+info)

Structural rRNA characters support monophyly of raptorial limbs and paraphyly of limb specialization in water fleas. (5/46)

The evolutionary success of arthropods has been attributed partly to the diversity of their limb morphologies. Large morphological diversity and increased specialization are observed in water flea (Cladocera) limbs, but it is unclear whether the increased limb specialization in different cladoceran orders is the result of shared ancestry or parallel evolution. We inferred a robust among-order cladoceran phylogeny using small-subunit and large-subunit rRNA nuclear gene sequences, signature sequence regions, novel stem-loops and secondary structure morphometrics to assess the phylogenetic distribution of limb specialization. The sequence-based and structural rRNA morphometric phylogenies were congruent and suggested monophyly of orders with raptorial limbs, but paraphyly of orders with reduced numbers of specialized limbs. These results highlight the utility of complex molecular structural characters in resolving ancient rapid radiations.  (+info)

Zooplankton structure and potential food web interactions in the plankton of a subtropical chain-of-lakes. (6/46)

This study evaluates the taxonomic and size structure of macro-zooplankton and its potential role in controlling phytoplankton in the Kissimmee Chain-of-Lakes, six shallow interconnected lakes in Florida, U.S. Macro-zooplankton species biomass and standard limnological attributes (temperature, pH, total phosphorus [TP], chlorophyll a [Chl a], and Secchi transparency) were quantified on a bimonthly basis from April 1997 to February 1999. Concentrations of TP ranged from below 50 to over 150 microg l(-1). Peak concentrations of particulate P coincided with maximal Chl a, and in one instance a high concentration of soluble reactive P followed. The cladoceran zooplankton was dominated by small species, including Eubosmina tubicen, Ceriodaphnia rigaudi, and Daphnia ambigua. The exotic daphnid, D. lumholtzii, periodically was abundant. The copepods were strongly dominated by Diaptomus dorsalis, a species previously shown to be highly resistant to fish predation. These results, and findings of controlled experiments on a nearby lake with a nearly identical zooplankton species complement, suggest that fish predation may be a major factor structuring the macro-zooplankton assemblage. Zooplankton biomass, on the other hand, may be affected by resource availability. There was a significant positive relationship between average biomass of macro-zooplankton and the average concentration of TP among the six lakes. No such relationship existed between zooplankton biomass and Chl a, suggesting that the predominant food web in these systems may be based on bacteria-plankton, as has been documented in nearby Lake Okeechobee. All of the zooplankton taxa encountered in the Kissimmee Chain-of-Lakes (except Mesocyclops edax) are known bacteria grazers in Florida lakes. Phytoplankton biomass, measured as Chl a, was strongly associated with TP, both within and across lakes. Phytoplankton biomass was not associated with the biomass of zooplankton. These results, when considered in the context of nutrient-addition, zooplankton-exclosure studies on Lake Okeechobee, support the hypothesis that phytoplankton biomass in subtropical lakes is regulated by "bottom-up," rather than "top-down" forces.  (+info)

Zooplankton community structure of two marginal lakes of the River Cuiaba (Mato Grosso, Brazil) with analysis of Rotifera and Cladocera diversity. (7/46)

In the present study, two small lakes on the margins of the River Cuiaba were analyzed regarding taxonomic composition and population densities of the zooplankton. Diversity was evaluated for two groups, Rotifera and Cladocera; sampling was carried out on two dates: 2 March 1999, in the rainy season, and 25 August 1999, in the dry season. Seventy-nine rotifer taxa, 30 cladoceran taxa, and 6 copepod taxa were found. Comparing the species identified in the present study with those recorded by other authors for several water bodies in Mato Grosso and Mato Grosso do Sul states, it was found that 9 species of Cladocera, 2 of Copepoda, and 14 of Rotifera are new records for the region. The most abundant rotifer species were Keratella cochlearis, Brachionus angularis, Polyarthra vulgaris, and Keratella americana. Moina minuta and Bosminopsis deitersi were dominant among the cladocerans, and Notodiaptomus transitans and N. devoyorum among the copepods. Comparing both lakes, the greatest species richness of both Rotifera and Cladocera was observed in Lake Souza Lima, during the rainy season. This is probably linked to the fact that the littoral region of this lake is densely colonized by macrophytes. The lake also has better environmental conditions since it does not receive domestic sewage inputs, as does Lake Parque Atalaia. The diversity of the Rotifera was markedly low in Lake Parque Atalaia, during the dry season, again perhaps linked domestic sewage input found in this water body.  (+info)

Morphological abnormalities in the cladoceran Ilyocryptus spinifer (Apipucos Reservoir, Pernambuco State, Brazil). (8/46)

In a sample taken from Apipucos Reservoir (Recife, PE, Brazil) for taxonomic study, a high percentage (40%) was found of cladoceran Ilyocryptus spinifer individuals with morphological abnormalities on their postabdomen. There was not a fixed pattern of the malformations, which varied in gravity, and could affect the postanal spines or terminal claws. The postabdominal abnormalities are described and compared to the ones described in the literature. The hypothesis of the morphological abnormalities being induced by an occasional environmental toxicant is discussed.  (+info)

*Leptodora

Cladocera), with notes on the phylogeny of the Cladocera". Journal of Morphology. 256 (3): 235-259. doi:10.1002/jmor.10043.. ... "Cladocera as Model Organisms in Biology". Hydrobiologia. 307: 273-282. doi:10.1007/BF00032021.. ,chapter=. ignored (help) ... Wilhelm Lilljeborg (1900). Cladocera Sueciae; oder Beiträge zur kenntniss der in Schweden lebenden Krebsthiere von der Ordnung ... "Crustacea-Cladocera checkList" (PDF). Freshwater Animal Diversity Assessment (FADA) Project. Belgian Biodiversity Platform. ...

*List of lakes in Carbon County, Montana

9,541 feet (2,908 m) Cladocera Lake, 45°04′18″N 109°39′43″W / 45.07167°N 109.66194°W / 45.07167; -109.66194 (Cladocera Lake ... "Cladocera Lake". Geographic Names Information System. United States Geological Survey. "Cloverleaf Lakes". Geographic Names ...

*水蚤 - 維基百科,自由的百科全書

枝角目 Cladocera. 科:. 溞科 Daphniidae. 屬:. 溞屬 Daphnia. Müller, 1785. ...

*Bosmina

... is a genus in the order Cladocera, the water fleas. Its members can be distinguished from those of Bosminopsis (the ... Stanley L. Dodson, Carla E. Cáceres & D. Christopher Rogers (2009). "Cladocera and other Branchiopoda". In James H. Thorp. ... Cladocera: Bosminidae), based on evidence from male morphological characters and molecular phylogenies" (PDF). Zoological ...

*Daphnia commutata

A. Kotov; L. Forró; N. M. Korovchinsky; A. Petrusek (March 2, 2012). "Crustacea-Cladocera checkList" (PDF). World checklist of ... freshwater Cladocera species. Belgian Biodiversity Platform. Retrieved October 29, 2012. ...

*Daphnia occidentalis

A. Kotov; L. Forró; N. M. Korovchinsky; A. Petrusek (March 2, 2012). "Crustacea-Cladocera checkList" (PDF). World checklist of ... doi:10.1111/j.1095-8312.2006.00687.x. John A. H. Benzie (1986). "Daphnia occidentalis, new species (Cladocera: Daphniidae) from ... Cladocera): a shared phylogenetic history transformed by habitat-specific rates of evolution" (PDF). Biological Journal of the ... freshwater Cladocera species. Belgian Biodiversity Platform. Retrieved October 29, 2012. ...

*List of Daphnia species

"Crustacea-Cladocera checkList" (PDF). World checklist of freshwater Cladocera species. Belgian Biodiversity Platform. Retrieved ... The genus Daphnia (Crustacea: Cladocera: Daphniidae) contains over 200 species of water fleas, many of which are in need of ...

*Daphnia (subgenus)

"Crustacea-Cladocera checkList" (PDF). World checklist of freshwater Cladocera species. Belgian Biodiversity Platform. Retrieved ...

*Daphnia

"Crustacea-Cladocera checkList" (PDF). World checklist of freshwater Cladocera species. Belgian Biodiversity Platform. Retrieved ... Daphnia are members of the order Cladocera, and are one of the several small aquatic crustaceans commonly called water fleas ... N.N.Smirnov (2014). The physiology of the Cladocera. Amsterdam: Academic Press. Dieter Ebert (2005). "Introduction to Daphnia ... ISBN 978-0-470-99926-4. Stanley L. Dodson; Carla E. Cáceres; D. Christopher Rogers (2009). "Cladocera and other Branchiopoda". ...

*Daphnia pulex

... was the first crustacean to have its genome sequenced.[15][16] Its genome contains 31,000 genes - 8,000 more than are present in the human genome - as a result of extensive gene duplication.[17]. One of the most astonishing features of the D. pulex genome is its compactness: despite being around 200 Mb in size (around 16-fold smaller than the human genome which is 3,200 Mb in size); its 12 chromosomes contain a minimum set of 30,907 predicted protein-coding genes, more than the 20,000-25,000 contained in the human counterpart.[17]. Such an efficient gene packaging is achieved by means of a small intron size. Indeed, whereas the mean protein length in D. pulex is quite similar to that of Drosophila, the average gene size is 1000 bp shorter in D. pulex. As inferred from EST analysis, the average intron size found in D. pulex genes is 170 bp.[17]. On the other hand, the intron density of D. pulex genome is similar to that of Apis mellifera, which in turn is twice of that found in ...

*Notostraca

ISBN 978-0-88864-234-9. Atte Korhola & Milla Rautio (2001). "Cladocera and other branchiopod crustaceans". In John P. Smol; ...

*Daphnia longispina

doi:10.1111/j.1463-6409.2008.00336.x. Green, J. (1974). "Parasites and epibionts of Cladocera". Transactions of the Zoological ... Benzie, J. A. H. (2005). Cladocera: The genus Daphnia (including Daphniopsis). Backhuys Publisher,. Pajunen, V. I.; I. Pajunen ... Smirnov, N. N. (2014). The physiology of the Cladocera. Academic Press, Amsterdam. Ebert, D. (2005). Ecology, epidemiology and ... doi:10.1007/s10750-007-0769-4. Smirnov (2014). The physiology of the Cladocera. Academic Press, Amsterdam. Lampert, W. (2011). ...

*Ephippia

... (singular: ephippium) are winter or dry-season eggs of the various species of small crustacean in the order Cladocera ... Smirnov, N. N. (2014). The physiology of the Cladocera. Academic Press, Amsterdam. Frederick Schram (1986). Crustacea. Oxford ... The physiology of the Cladocera. Amsterdam: Academic Press. Dieter Ebert (2005). "Introduction to Daphnia biology". Ecology, ...

*Nocardioides daphniae

nov., isolated from Daphnia cucullata (Crustacea: Cladocera)". International Journal of Systematic and Evolutionary ...

*Eugen von Daday

Cladocera: Proceedings of the Cladocera Symposium, Budapest 1985. Developments in Hydrobiology. Springer Netherlands. pp. 1-3. ...

*Anomopoda

... is a suborder of the order Cladocera. These crustaceans, a type of water flea, are members of the Class Branchiopoda ...

*Moinidae

... is a crustacean family within the order Cladocera. Species within this family are widely occurring including the ...

*Ordospora colligata

nov.), a new microsporidian parasite of Daphnia magna (Crustacea, Cladocera)". European Journal of Protistology. 33 (4): 432- ...

*Marine microorganism

Microscopic marine crustaceans include some copepods, cladocera and water bears. Some marine nematodes and rotifers are also ...

*Celsinotum candango

nov.(Crustacea: Cladocera: Chydoridae), a new species from the Brazilian Cerrado."Zootaxa 3821.1 (2014): 088-100. Sousa, ... "Evaluation of a new sampling method for assessing Cladocera richness (Crustacea, Branchiopoda) in macrophyte-rich wetlands." ...

*Hamiltosporidium

n. (Microspora: Duboscqiidae), a microsporidian parasite of Daphnia magna (Crustacea: Cladocera: Daphniidae)". Acta ...

*Branchiopoda

Cladocera is an order of small crustaceans commonly called water fleas. Around 620 species have been recognised so far, with ... It comprises fairy shrimp, clam shrimp, Cladocera, Notostraca and the Devonian Lepidocaris. They are mostly small, freshwater ... as in most Cladocera), broad and shallow (as in the Notostraca), or entirely absent (as in the Anostraca). In the groups where ... the carapace prevents the use of the trunk limbs for swimming (Cladocera, clam shrimp and the extinct Lipostraca), the antennae ...

*Eduardo H. Rapoport

Rapoport, E.H. (1957) Population studies on three species of Cladocera. Nature 179: 637-638. Rapoport, E.H. & Rapoport, Osvaldo ...

*Acroperus tupinamba

"Checklist de Cladocera de água doce do Estado de São Paulo." Biota Neotropica 11.1 (2011): 1-21.. ... "O estado atual do conhecimento da diversidade dos Cladocera (Crustacea, Branchiopoda) nas águas doces do estado de Minas Gerais ...

*Ural River

Other dominating inhabitants of the river are protozoa, rotifers, Cladocera and copepods. Mollusks are mostly represented by ...

*Cave insect

Troglobitic Crustaceans include species of Amphipoda, Cladocera, Copepoda, Decapoda, Isopoda, and Syncardida. Many troglobites ...
E1295-01(2013) Standard Guide for Conducting Three-Brood, Renewal Toxicity Tests with Ceriodaphnia dubia three-brood toxicity test~ effluents~ Ceriodaphnia dubia~ cladocera~
Freshwater: From the database of chronic cobalt toxicity to freshwater invertebrates, 55 individual EC10 or NOEC values for 6 different individual species were reported. The NOEC/L(E)C10 ranged from 1.4 µg/L to 45 µg/L for Ceriodaphnia dubia exposed to a range of water types (CDI 2010i). The table below represents the EC10 values of high quality studies used for the derivation of HC5 and aquatic freshwater PNEC. Where multiple data exist for a given species (,5), e.g., Ceriodaphnia dubia, the geometric mean of the available EC10s for the most sensitive endpoints from each test were used. Table X. High quality studies used for derivation of the HC5and freshwater PNEC ...
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 ...
Description: The University of North Texas Stream Research Facility (UNTSRF) was designed to examine contaminant impacts on effluent-dominated stream ecosystems. Stream mesocosms, fed municipal effluent from the City of Denton, TX, Pecan Creek Water Reclamation Plant (PCWRP), were treated with 0, 15 or 140 µg/L cadmium for a 10-day study in August 2000. Laboratory toxicity test and stream macroinvertebrate responses indicated that cadmium bioavailability was reduced by constituents of effluent-dominated streams. The Biotic Ligand Model (BLM) for Cd was used to predict a 48 hour Cd EC50 for Ceriodaphnia dubia of 280 µg/L in these effluent-dominated streams. This value is higher that an EC50 of 38.3 µg/L Cd and a 7-day reproduction effect level of 3.3 µg/L Cd generated for C. dubia in reconstituted laboratory hard water. These results support use of a cadmium BLM for establishing site-specific acute water quality criteria in effluent-dominated streams. Although not affected by 15 µg/L ...
Cladocera is an order of small crustaceans commonly called water fleas. Around 620 species have been recognised so far, with many more undescribed.[1]. They are everywhere in inland aquatic habitats, but rare in the oceans.[2] Most are 0.2-6.0 mm (0.01-0.24 in) long, with a down-turned head, and a carapace covering the thorax and abdomen.[3] There is a single median compound eye.[2] They swim with jerking flea-like movements.. Most species show cyclical parthenogenesis, where asexual reproduction is occasionally supplemented by sexual reproduction. The sexual reproduction produces resting eggs that allow the species to survive harsh conditions and disperse to distant habitats.[4]. ...
Nawrocki, S. T., K. D. Drake, C. F. Watson, G. D. Foster, and K. J. Maier. (2005). Comparative aquatic toxicity evaluation of 2-(thiocyanomethylthio) benzothiazole (TCMTB) and selected degradation products using Ceriodaphnia dubia. Arch. Environ. Contam. Toxicol. 48: 344-350. Maier, K. J., J. L. Stobbe and K. D. Drake. (2003) Response to Letter to the Editor (re: Stobbe et al., 2003). International Journal of Toxicology 22:475-478. Stobbe, J. L., K. D. Drake, and K. J. Maier. (2003). Comparison of in vivo (Draize method) and in vitro (Corrositex assay) dermal corrosion values for selected industrial chemicals. International Journal of Toxicology 22:99-107. Davis, S. M., K. D. Drake, and K. J. Maier. (2002). Toxicity of boron to the duckweed, Spirodella polyrrhiza. Chemosphere. 48: 615-620. Dethloff, G. M., H. C. Bailey and K. J. Maier. (2001). Effects of dissolved copper on select hematological, biochemical and immunological parameters of wild rainbow trout (Onchrhynchus mykiss). Arch. Environ. ...
Latonopsis australis is a rare Cladocera inhabiting the entire stretch of the Cochin backwaters, the largest monsoonal estuary along the West Coast of India, during the summer monsoon, but restricted to the upper reaches during the non-monsoon periods. Here, we present the results of an experimental study, which assessed the influence of salinity on the life table demography of the species at different salinity levels. The life table demographic parameters such as net reproduction rate, generation time, intrinsic growth rate, gross reproductive rate, and survivorship of the species were measured in different salinities ranging from freshwater to mesohaline levels (salinity 14). The study showed that higher salinity had a significant negative effect on all life table demography parameters of the species, whereas freshwater to low saline conditions (salinity up to 8) favored the survivorship, life expectancy, net production, and growth rate. It was also noticed that salinity above 8 caused a ...
Define Cladocerans. Cladocerans synonyms, Cladocerans pronunciation, Cladocerans translation, English dictionary definition of Cladocerans. n. pl. 1. An order of the Entomostraca
Banta, Arthur Mangun (1930) Further observations on control of sex with Cladocera. In: Proceedings of the Second International Congress for Sex Research, 1930. Banta, Arthur Mangun (1930) The elimination of the male sex in the evolution of some lower animals. The Scientific Monthly, 30 (1). pp. 59-65. Banta, Arthur Mangun, Brown, Leland A. (January 1930) Control of sex in Cladocera. VI. By treatment with drugs. Physiological Zoology, 3 (1). pp. 48-55. Banta, Arthur Mangun, Wood, Thelma Rittenhouse (1930) Further studies on inheritance in Cladocera. The Anatomical Record, 47 (3). pp. 389-390. Belling, John (1930) The life-world; poems of science. The Mary Margaret Morgan Co., San Francisco. Blakeslee, Albert Francis (1930) Genetics at Storrs. In: Bulletin of the Storrs Agricultural Experiment Station: Dedication of Atwater Laboratory, June 12, 1930. Connecticut Agricultural College, Storrs, Connecticut, pp. 225-231. Blakeslee, Albert Francis (December 1930) Heredity and environment. The ...
To interpret the remains of Cladocera in lake sediments in relation to pH history, fish abundance, vegetation change, trophic level change and other historic events, it is necessary to understand the balance of abiotic and biotic forces responsible for their present distribution, population dynamics and morphological types. Once these factors are understood, we can reverse the arguments to infer past lake conditions. Many cladoceran species are influenced by fish and invertebrate predation. Some species, especially in the plankton, also show a clear physiological relation to pH and aluminium levels in lakes. Moreover, several littoral-benthic species have a habitat distribution restricted to rock, sand, mud, vegetation, or a combination of some of these. Remains of littoral and planktonic cladocerans were analysed in surface sediments of 18 Norwegian lakes with pH ranging from 4.5-7.5. In addition, sediment cores from four sites in Norway, four in Scotland and one in Sweden were analysed. The ...
Cla*doce*ra (?), n. pl. [NL., fr. Gr. a sprout + a horn.] Zoology|Zool. An order of the Entomostraca. ⇒ They have a bival...
Banker, Howard James (1931) Distribution of school success in families. The Journal of Heredity, 22 (12). pp. 373-379. Banker, Howard James (1931) Mental age distribution in school progress. Journal of Educational Research, 23 (4). pp. 273-279. Banta, Arthur Mangun (1931) Completion and preparation for publication of studies with Cladocera. In: Carnegie Institution of Washington Year Book No. 30, 1930-31. Carnegie Institution of Washington, Washington, D. C., pp. 423-425. Banta, Arthur Mangun, Brown, Leland A. (1931) Attempts to analyze the effects of crowding upon male production in the Cladoceran, Moina macrocopa. The Anatomical Record, 51 (1, sup). Banta, Arthur Mangun, Brown, Leland A. (1931) Factors involved in male production by crowded Moina macrocopa mothers. Proceedings of the Society for Experimental Biology and Medicine, 28 (8). pp. 820-822. Banta, Arthur Mangun, Wood, Thelma Rittenhouse (1931) Dwarf and slow developing clones of Daphina longispina. The Anatomical Record, 51 (1, sup). ...
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] ...
Hey guys, just wanted to know what you guys think of Beneful Original Dry Dog Food as the staple protein source for my Dubia colony. Heres the link...
Discover Lifes page about the biology, natural history, ecology, identification and distribution of Scolia dubia, scoliid wasp image
Rosenberg, G. (2013). Iolaea dubia Golikov & Kussakin in Golikov & Scarlato, 1967. In: MolluscaBase (2017). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=576641 on 2017-12- ...
Arrowhead Alpines Bellevalia dubia - Youd be forgiven for mistaking this for a muscari (it was included in that genus in the past, I believe), though more intricately and vividly colored than any grape hyacinth. Flowers are an intense, almost iridescent blue tipped with green when in bud, and morph into a greenish-brown once they
Index Fungorum Partnership (2018). Index Fungorum. Glugea cladocera Pfeiffer. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=559097 on 2018-02-20 ...
See http://digital.library.louisville.edu/cdm/description/collection/furnas#conditions for guidance on citing this item. To cite the digital version, add its Reference URL (found by following the link in the header above the digital file ...
Lees hier alle actuele berichten over de programmas, programmamakers, mediapartners, Amsterdamse organisaties en de ontwikkelingen bij SALTO!
Objectives: 1. Locate and assemble scientific data from the U.S. Arctic on the concentrations and effects of POPs in all compartments (e.g., marine and terrestrial biota, abiotic substrates) of the Arctic. 2. Evaluate, analyze and summarize these scientific data from the U.S. Arctic into text suitable for inclusion in a new (second) AMAP publication on POPs. 3. Disseminate the summarized information via a U.S. AMAP Internet page that is directly linked to the current International AMAP Internet page. Summary (Abstract): The Arctic Monitoring and Assessment Programme (AMAP) was established in 1991 and given the responsibility of monitoring the concentrations and assessing the effects of selected anthropogenic pollutants in all compartments of the Arctic. The first AMAP assessment report, published in 1998, points out gaps in our current understanding of contaminant inputs, their transport processes and food web interactions. In addition, the AMAP report noted a serious lack of information about
Jeremy Keiths "Year Zero" beautifully explains why the W3C needs our backs, not our bullets.. The W3C is maddeningly opaque and its lieutenants will sometimes march madly into the sea, but it is all that stands between us and the whirlwind.. Slow the W3C will always be. Slow comes with the territory. If you glimpse even a hint of the level of detail required to craft usable standards, youll understand the slowness and maybe even be grateful for it-as youd be grateful for a surgeon who takes his time while operating on your pancreas.. But the secrecy (which makes us read bad things into the slowness) must and will change. To my knowledge, the W3C has been working on its transparency problems for at least two years and making real change-just very slowly (theres that word again) and incrementally and hence not at all obviously.. Key decision makers within the W3C intend to do much more, but they need to get their colleagues on board, and consensus-building is a bitch. A slow bitch.. If ...
is a personal favorite of mine: a thriller only a geek could write (Sundman has decades of experience in computer programming), with real characters, frenetic action and suspense, salty dialog, and serious ideas behind the hot cyber action. If Dan Brown read Sundman, he would understand that thrillers about ideas dont have to be claustrophobic, one-dimensional, and absurd. If he took Sundman to heart, he would write better books, although they would sell fewer copies.. Which brings it back to you. Sundman is a brilliant author who, for political, intellectual, or other reasons shuns mainstream publishing and success. If we are to keep enjoying his works, we need to help him realize them. I was proud to contribute to ...
Thankfully, Romesberg and his team have no intention of using their research to provoke some kind of explosion of new, hybrid life forms. As Romesberg told Reuters, his X and Y nucleotide bases cant bond with DNAs natural bases, nor can these semi-synthetic organisms (SSOs) survive outside a laboratory setting. "They cant escape," Romesberg said. "Theres no Jurassic Park scenario ...
Exif Keywords: Natur, nature, animals, Tiere, Anura, Amphibien, Amphibians, Froschlurche, Frogs, Toads, Froesche, Kroeten, Terraristik, Terraristic, Vivarium, ...
Linnaeus, C. 1758. Systema Naturae per regna tria naturæ, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis, Tomus I. Editio decima, reformata. Holmiæ: impensis direct. Laurentii Salvii. i-ii, 1-824 pp doi: 10.5962/bhl.title.542: page 212. ...
La pintura y el arte ha magnificado hasta hoy la inmovilidad del pensamiento, el éxtasis y el sueño, nosotros queremos exaltar el movimiento agresivo, el insomnio febril, la carrera, el salto mortal, la bofetada y el puñetazo ...
We are extremely pleased to have attracted a group of world-renowned leaders to one of our key focus areas, atrial fibrillation" said Robert Fischer, MD, CEO of OMEICOS. "The addition of these seasoned experts to OMEICOS Clinical Advisory Board is a testament to the potential of our program and we look forward to their invaluable scientific and clinical development expertise as we shape our strategy to develop an effective therapeutic to achieve long term rhythm control in patients with AF.". Dr. Leonardo Calóis focused on studying cardiac arrhythmias, electrophysiology and ablation and is an expert in the functional role played by omega-3 fatty acids in the prevention of arrhythmias in different settings. He is a Fellow of the European Society of Cardiology and has participated in several international clinical trials. He is associated Editor of Journal of Cardiovascular Interventional Electrophysiology and European Journal of Preventive Cardiology, has authored or co-authored numerous papers ...
Water flea eye. Polarised light micrograph of the eye of a Sida crystallina water flea. Water fleas (order Cladocera) are small crustaceans, commonly found in fresh water. They are filter feeders that ingest algae, protozoa or organic matter, and are a constituent of plankton. Magnification: x400 when printed 10 centimetres wide. - Stock Image C028/9152
article{2094443, author = {Nguyen Thi Hong, Lien and Muyssen, Brita and Janssen, Colin}, issn = {0045-6535}, journal = {CHEMOSPHERE}, keyword = {Hyalella azteca,Zinc,Sediment toxicity,Dietary exposure,Selective feeding,ACID VOLATILE SULFIDES,SIMULTANEOUSLY EXTRACTED METALS,FRESH-WATER INVERTEBRATES,TOXICITY TESTS,BOUND METALS,NEANTHES-ARENACEODENTATA,AQUATIC INVERTEBRATES,REPRODUCTIVE TOXICITY,AVOIDANCE-RESPONSE,SPIKED SEDIMENTS}, language = {eng}, number = {1}, pages = {84--90}, title = {Single versus combined exposure of Hyalella azteca to zinc contaminated sediment and food}, url = {http://dx.doi.org/10.1016/j.chemosphere.2011.11.066}, volume = {87}, year = {2012 ...
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 ...
Phacelia dubia (known by the common names smallflower phacelia or Appalachian phacelia) is an annual forb native to the eastern United States, that produces cream colored or light blue flowers in early spring. Phacelia dubia has slender ascending stems which are 12 to 30 centimeters long, finely pubescent or smooth, and branched from the base. Its lower and basal leaves are petiolate, 2.5 to 5 centimeters long, and dentate or with pinnatifid lobes. Its upper leaves are sessile, much smaller, and less divided. The flowers are 8 to 11 millimeters broad. They are borne on 6 to 15 millimeter long pedicles, in racemes of 5 to 15 flowers. The fruit is a capsule 3 millimeters in diameter. Phacelia dubia is widely distributed in the eastern United States, although local distribution may be spotty. It has been recorded in Alabama, Arkansas, Washington, D.C., Delaware, Georgia, Louisiana, Maryland, Mississippi, North Carolina, New York, Ohio, Pennsylvania, South Carolina, Tennessee, Virginia, and West ...
The common evergreen dwarf shrub Empetrum hormaphroditum has influence on the functioning of boreal terrestrial ecosystems in northern Sweden. The negative effects of E. hermaphroditum are partly attributed to the production of the dihydrostilbene, batatasin-III, which is released from leaves and litter by rain and snowmelt. In this study, we investigated whether batatasin-III is carried by runoff into streams and lakes during the snowmelt period and whether it is also potentially hazardous to aquatic fauna. Sampling of water from streams and a lake for which the surrounding terrestrial vegetation is dominated by E. hermaphroditum was done during the snowmelt period in May 1993 and in 1998, and analyzed for batatasin-III. Using 24- and 48-hr standard toxicity tests, we analyzed toxicity to brown trout (Salmo trutta) alevins and juvenile water fleas (Daphnia magna). Toxicity (proportion of dead individuals) to trout was tested at pH 6.5 and compared with that of a phenol within a range of ...
Microcrustacean emergence from the dry sediments is an important colonization pathway that allows these microfauna to recover and repopulate temporary aquatic habitats after months or years of dryness. Viable microcrustacean propagules in sediments of three different temporary aquatic habitats - rainpools located within the rarely flooded portions, frequently flooded floodplains and rarely flooded floodplains - were assessed experimentally by flooding the soils. Three major groups of microcrustaceans - cladocerans, copepods and ostracods - emerged from the sediments. Species richness and mean total numbers of emerged microcrustaceans per sample varied across the studied temporary aquatic habitats (Kruskal-Wallis, p , 0.05). Both species richness and mean total number of emerged microcrustacean per sample were lowest in sediments of rarely flooded floodplains. The highest species richness of microcrustaceans emerged from the treatments with soils of the frequently flooded floodplains. The mean ...
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 ...
Coupling of physical, biological and chemical processes associated with particle resuspension and seston flux was investigated at three sites in the North Sea with contrasting water column (mixed/stratified) and seabed (cohesive/non-cohesive) characteristics. Seston concentration was determined by a combination of local resuspension and advection of a regional horizontal concentration gradient. Model simulations of observations show that fair weather, the bed erosion rate was limited by the availability of suitable bed material. The resuspended particles were derived from a surficial veneer of material (fluff) that was relatively enriched in organic carbon. Sediment from the bed itself was therefore not resuspended by tidal currents even at a shallow water, sandy site. Bioturbation of the seabed by infauna significantly modified the properties of muddy sands at a deep water site in summer, but this was insufficient to cause tidal entrainment of the bed sediment. Resuspension increased under ...
However, the actual feeding mechanisms employed by different zooplankters exert an overriding primary control that of food particle acquisition. It is in this context that we primarily attribute Ceratiums influence on zooplankton composition favouring Bosmina and calanoid copepods, while inhibiting Daphnia and Moina (as explained below).. Bosmina has been characterised as an undergrowth taxon able to find and feed on diffuse small food particles (including bacteria) in a nutritional environment overwhelmed by large, mostly inedible particles (Sommer et al., 1986). Similarly, the raptorial feeding mechanism of calanoid (and cyclopoid) copepods allows them to very selectively locate scarce suitable food particles (Koehl and Strickler, 1981; Strickler, 1984; Vanderploeg and Paffenhofer, 1985; Paffenhofer and Lewis, 1990; Brandl, 1998). Conversely, Daphnia employs non-selective bulk filtration, a mode of food collection that greatly compromises it when suspended particles are predominantly ...
3a. Corylus cornuta subsp. cornuta Beaked hazel Corylus cornuta var. megaphylla Victorin & J. Rousseau; C. rostrata Aiton. Shrubs , open spreading, to (4--)6 m. Bark light brown, smooth. Branches ascending; twigs glabrous to sparsely pubescent, without glandular hairs. Winter buds containing inflorescences ovoid, 3--5 × 3--4 mm, apex acute. Leaves: petiole glabrous to moderately pubescent, without glandular hairs. Leaf blade ovate to obovate or narrowly elliptic, often nearly angular and lobulate near apex, 5--12 × 3.5--9 cm, base narrowly cordate to narrowly rounded, margins coarsely and often irregularly doubly serrate, apex usually distinctly acuminate; surfaces abaxially glabrous to moderately pubescent, usually pubescent on major veins and in vein axils. Inflorescences: staminate catkins usually in clusters of 2--3, 4.5--6 × 0.5--0.8 cm; peduncles mostly 0.5--2 mm. Nuts in clusters of 2--6; involucral tubular beak long, narrow, 2--3(--4) times length of nuts, densely bristly. 2 n = 22, ...
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 ...
Toxicity tests are most frequently conducted on organisms derived from laboratory cultures that have been reared for many generations following standardized protocols. The restricted density of laboratory populations and the possibility of occasional population crashes increases the probability that random genetic drift and inbreeding may decrease genetic variation of the culture below that typically found in natural populations of the species. Likewise, isolation of organisms in different laboratories may contribute to significant genetic differentiation among culture populations... In the situation where certain genotypes are more resistant to a particular stressor, using a culture that is dominated by the resistant genotype may underestimate the toxic effect of a contaminant. Similarly, the inclusion of a greater number of sensitive genotypes in a test may overestimate toxicity. This experiment was conducted to test the null hypothesis that no difference in tolerance to zinc contamination ...
Lypha dubia (Fall.)(Dipt.: Tachinidae) as a Parasite of the European Pine Shoot Moth,Rhyacionia buoliana (Schiff.)Lep.: Eucosmidae) in ...
The last ten years have witnessed increasing interest in host-pathogen interactions involving invertebrate hosts. The invertebrate innate immune system is now relatively well characterised, but in a limited range of genetic model organisms and under a limited number of conditions. Immune systems have been little studied under real-world scenarios of environmental variation and parasitism. Thus, we have investigated expression of candidate innate immune system genes in the water flea Daphnia, a model organism for ecological genetics, and whose capacity for clonal reproduction facilitates an exceptionally rigorous control of exposure dose or the study of responses at many time points. A unique characteristic of the particular Daphnia clones and pathogen strain combinations used presently is that they have been shown to be involved in specific host-pathogen coevolutionary interactions in the wild. We choose five genes, which are strong candidates to be involved in Daphnia-pathogen interactions, ...
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From York University - quite possibly the most poorly written science by press release Ive seen this year. The leaps of may are profound, and the footbal team analogy is designed to elicit sympathy. I suppose if Daphnia populations were collapsing in lakes due to lack of helmets and shoulder pads, wed see a collapse…
IT is a question worthy of the scientists of CSI Miami -- which has the more complex gene structure a human being or the humble flea?
Confocal microscopic image captured through the Keith Porter Image Facility, UMBC, a collaborative project between Stephen Bradley & Dr. Tagide deCarvalho, UMBC. The process is called autofluorescence a natural emission of light by biological structures such as mitochondria and lysosomes when they have absorbed light, and is used to distinguish the light originating from artificially added fluorescent markers (fluorophores). The bug was sampled from Masonville Cove Environmental Education Center, next to Brooklyn & Curtis Bay, Maryland, August 2017. The overall project is called Waters Edge, Biome Tells, funded by a UMBC summer research fund.. ...
The poor diversity of the zooplankton community and of copepods appears to be a characteristic feature of several small basins on the Egyptian Mediterranean coast, particularly those receiving land-based effluents (e.g. Abdel-Aziz & Dorgham 2002, Abdel-Aziz 2004). The number of. zooplankton species recorded Enzalutamide during the present study (42 taxa including larval stages) is slightly higher than that recorded (37 taxa) by Abou-Zeid (1990) and El-Serehy et al. (2001). This may be because their studies did not take into account the western lagoon connected with the lake, or the continuous dredging activities in the main lake and shipping lane, which renew the lakes water masses. In general, the low number of species recorded in the lake can be attributed to the continuous discharge of wastewater, which leads to increasing nutrient concentrations and hence the dominance of just a few. species. This was confirmed by Ludsin et al. (2001) and Prepas & Charette (2003), who concluded that the ...
Johnny Jump Up Viola Cornuta is a compact annual or short-lived perennial, native to Spain and the Pyrenees Mountains. Johnny Jump Up can flower all winter in areas with mild climate. Sow Outdoors: Spring/Fall.
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. ...
1. The labral glands consist of a proximal and a distal group of gland-cells.. 2. The proximal group consists on each side of about twenty cells. The cells possess large flat nuclei and their secretion collects as intercellular vaeuoles.. 3. The distal glands which are in connexion with the proximal groups consist on each side of five cells--four gland-cells and a duct-cell. The anterior pair of gland-cells possess large spheroidal nuclei between which is an ill-defined reservoir of secretion. The posterior pair have cup-shaped nuclei between which is a very definite reservoir of secretion.. 4. The duct-cell is in the form of a hollow tube, one end opening to the exterior near the tip of the labrum and the other end opening into the reservoir of secretion between the nuclei of the posterior pair of distal gland-cells. The duct-cells act as ducts for the whole of the labral glands, the secretion passing as vacuoles from cell to cell.. 5. The duct-cell alters the reaction of the secretion before ...
We had an opportunity to walk this years ICFF show and found some new things that were quite impressive. But there was one particular sighting that got us really excited. In 2011, the design duo Salto & Sigsgaard won a design competition under the auspices of the Danish Ministry of Culture to design the furniture for one of the permanent chambers at the United Nations headquarters here in New York, The Trusteeship Council Chamber also referred to as the Finn Juhl Chamber. In connection with this, Onecollection has developed, produced, and delivered a completely new unique and beautiful chair named "Council Chair" designed by Kasper Salto and Thomas Sigsgaard and it made its "public" debut at ICFF (the grand opening of the TCC, was held in the UN on April 25th 2013). The chairs pass on the baton from Finn Juhls iconic design heritage in a sculptural and pleasant direction, which merges shape, color and natural materials. The chairs are a construction of moulded 3D veneer in oak or walnut, ...
We had an opportunity to walk this years ICFF show and found some new things that were quite impressive. But there was one particular sighting that got us really excited. In 2011, the design duo Salto & Sigsgaard won a design competition under the auspices of the Danish Ministry of Culture to design the furniture for one of the permanent chambers at the United Nations headquarters here in New York, The Trusteeship Council Chamber also referred to as the Finn Juhl Chamber. In connection with this, Onecollection has developed, produced, and delivered a completely new unique and beautiful chair named "Council Chair" designed by Kasper Salto and Thomas Sigsgaard and it made its "public" debut at ICFF (the grand opening of the TCC, was held in the UN on April 25th 2013). The chairs pass on the baton from Finn Juhls iconic design heritage in a sculptural and pleasant direction, which merges shape, color and natural materials. The chairs are a construction of moulded 3D veneer in oak or walnut, ...
Veteran Guys Reward will bid for his second win of the year in the $150,000 Canadian Turf Stakes (gr. IIIT) Feb. 22 at Gulfstream Park.
Marine Pollution Bulletin Volume 101, Issue 1, 15 December 2015, Mercury and selenium in seston, marine plankton and fish (Sardinella brasiliensis) as a tool
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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
Introduction. The effect of caffeine on heart rate Aim: To investigate the effect of caffeine on the heart rate of Daphnia (water fleas). Introduction: Plants produce caffeine as an insecticide. Cocoa in South America, coffee in Africa and tea in Asia have all been used for hundreds of years to produce pick me up drinks containing caffeine. These days, caffeine is also used as a flavour enhancer in a wide range of cola and other soft drinks. ...read more. Middle. This can lead to heart and circulation problems. Daphnia are small, planktonic crustaceans commonly called water fleas because of their saltatory swimming style (although fleas are insects and thus only very distantly related). They live in various aquatic environments ranging from acidic swamps to freshwater lakes, ponds, streams and rivers. Hypothesis: Caffeine will increase the heart rate of the Daphnia (water fleas). Equipment needed: * Culture of Daphnia (water fleas) * Cavity slides * Dropping pipettes * Distilled water and pond ...
Hoffmann, A.C.cilia; Orsi, M.L.; Shibatta, O.A., 2005: Fish diversity in the UHE Escola Engenharia Mackenzie Capivara reservoir, Paranapanema River, upper Rio Parana basin, Brazil, and the importance of large tributaries in its maitenance Diversidade de peixes do reservatario da UHE Escola Engenharia Mackenzie Capivara, Rio Paranapanema, bacia do alto rio Parana, Brasil, e a importancia dos grandes tributarios na sua manutencao
Carolyn Waugh Burns is a New Zealand zoologist. She is currently Emeritus Professor at the University of Otago Burns completed a PhD at the University of Toronto entitled The feeding behaviour of Daphnia under natural conditions in 1966 before moving to University of Otago, where she rose to professor before her retirement. In 2017 Burns won a Marsden Medal and is Convenor of the Ecology, Evolution and Behaviour panel for the Marsden Fund. Burns, Carolyn W. "THE RELATIONSHIP BETWEEN BODY SIZE OF FILTER‐FEEDING CLADOCERA AND THE MAXIMUM SIZE OF PARTICLE INGESTED." Limnology and Oceanography 13, no. 4 (1968): 675-678. Hall, Donald J., Stephen T. Threlkeld, Carolyn W. Burns, and Philip H. Crowley. "The size-efficiency hypothesis and the size structure of zooplankton communities." Annual Review of Ecology and Systematics 7, no. 1 (1976): 177-208. Burns, Carolyn W. "Relation between filtering rate, temperature, and body size in four species of Daphnia." Limnology and Oceanography 14, no. 5 ...
Although early studies qualitatively documented the importance of cross-habitat energy transfers from seagrasses to coral reefs, such exchanges have yet to be quantified. Empirical evidence suggests that grazing by reef-associated herbivores along the coral reef-seagrass interface can be intense (e.g. conspicuous presence of bare-sand halos surrounding coral reefs). This evidence must be interpreted with caution, however, as most of it comes from areas that have experienced sustained, intense overfishing. To quantify the impacts of piscivore removal on cross-habitat energy exchange at the coral reef-seagrass interface, we compared grazing intensity along fished and no-take reefs in the upper and lower Florida Keys. Using visual census techniques and direct measures of seagrass grazing, we documented the impacts of piscivore density on herbivory along the seagrass-coral reef interface. Grazing rates were greater than observed seagrass (Thalassia testudinum) production near reefs in the upper Keys, but
We show that the stable (C, N, O) isotopic composition of the water flea Daphnia pulicaria is strongly related to that of its diet (C, N) and the water they live in (O). We also show that the stable isotopic composition of the sheaths of Daphnia resting eggs (ephippia) is indicative of the isotopic composition of Daphnia that produced them. This implies that stable isotope ratios of fossil Daphnia ephippia can provide information on past ecological and climatic developments in and around lakes ...
CLADOCERA (Gr 1), CRACKSMAN (Gr 1), FIRE LILY (Gr 1), HARBOUR LAW (Gr 1), HAYA LANDA (Gr 1), HYDRANGEA (Gr 1), MAGICAL (Gr 1), MAIN SEQUENCE (Gr 1), MAYSON (Gr 1), MUTAKAYYEF (Gr 1), NOW OR NEVER (Gr 1), OLMEDO (Gr 1), POLARISATION (Gr 1), PRECIEUSE (Gr 1), RHODODENDRON (Gr 1), THE UNITED STATES (Gr 1), WINSILI (Gr 1), AREO (Gr 2), AYAHUASCA (Gr 2), DANON GELATO (Gr 2), FIGHTING IRISH (Gr 2), FLYING THE FLAG (Gr 2), GOOD OLD BOY LUKEY (Gr 2), GOSPEL CHOIR (Gr 2), LUCKY KRISTALE (Gr 2), MAJEYDA (Gr 2), MARENKO (Gr 2), MIKKI ROCKET (Gr 2), MITTERSILL (Gr 2), PETIT CHEVALIER (Gr 2), PLUJA (Gr 2), SMASH WILLIAMS (Gr 2), WORLD IMPACT (Gr 2), ZONDERLAND (Gr 2), ASHKARI (Gr 3), BANK OF BURDEN (Gr 3), BRISANTO (Gr 3), CHARLIE EM (Gr 3), DAVIDS PARK (Gr 3), DEFOE (Gr 3), DELECTATION (Gr 3), DOWNFORCE (Gr 3), ELIZABETH DARCY (Gr 3), ETERNALLY (Gr 3), FAN DII NA (Gr 3), FANTASTIC MOON (Gr 3), FINAL FRONTIER (Gr 3), FIREY SPEECH (Gr 3), GAME ZONE (Gr 3), HABAYA (Gr 3), HATHEER (Gr 3), INTIMATION (Gr 3), LA ...
CLADOCERA (Gr 1), CRACKSMAN (Gr 1), FIRE LILY (Gr 1), HARBOUR LAW (Gr 1), HAYA LANDA (Gr 1), HYDRANGEA (Gr 1), MAGICAL (Gr 1), MAIN SEQUENCE (Gr 1), MAYSON (Gr 1), MUTAKAYYEF (Gr 1), NOW OR NEVER (Gr 1), OLMEDO (Gr 1), POLARISATION (Gr 1), PRECIEUSE (Gr 1), RHODODENDRON (Gr 1), THE UNITED STATES (Gr 1), WINSILI (Gr 1), AREO (Gr 2), AYAHUASCA (Gr 2), DANON GELATO (Gr 2), FIGHTING IRISH (Gr 2), FLYING THE FLAG (Gr 2), GOOD OLD BOY LUKEY (Gr 2), GOSPEL CHOIR (Gr 2), LUCKY KRISTALE (Gr 2), MAJEYDA (Gr 2), MARENKO (Gr 2), MIKKI ROCKET (Gr 2), MITTERSILL (Gr 2), PETIT CHEVALIER (Gr 2), PLUJA (Gr 2), SMASH WILLIAMS (Gr 2), WORLD IMPACT (Gr 2), ZONDERLAND (Gr 2), ASHKARI (Gr 3), BANK OF BURDEN (Gr 3), BRISANTO (Gr 3), CHARLIE EM (Gr 3), DAVIDS PARK (Gr 3), DEFOE (Gr 3), DELECTATION (Gr 3), DOWNFORCE (Gr 3), ELIZABETH DARCY (Gr 3), ETERNALLY (Gr 3), FAN DII NA (Gr 3), FANTASTIC MOON (Gr 3), FINAL FRONTIER (Gr 3), FIREY SPEECH (Gr 3), GAME ZONE (Gr 3), HABAYA (Gr 3), HATHEER (Gr 3), INTIMATION (Gr 3), LA ...
Ankistrodesmus braunii ATCC ® 30447™ Designation: UTEX 187 [CCAP-202/9a] Isolation: Material collected by T. Christensen, Madingley Brick Pits, England, 1949
Book now at Sol Azteca Restaurant in Boston, explore menu, see photos and read 440 reviews: Sol Azteca exceeded every expectation. Delicious food, attentive service and quite possibly the best margaritas in Boston.
Sarah Karimi MS16, a doctoral student in the Department of Chemistry and Biochemistry at UT Dallas, recently received the Simon Karecki Award for outstanding contributions to environmental research and for academic excellence.. Karimis research examines the potential toxicity of nanoparticles used by the semiconductor industry to smooth and polish the surface of silicon wafers, which eventually become the transistors found in electronic devices. Karimi said that because the nanoparticles are used in large quantities, there is the potential for them to wind up in waterways.. "My work is on aquatic toxicology, and I use the freshwater flea Daphnia magna as a model organism. This research is a beautiful interface of biology and chemistry," Karimi said. "These organisms are recommended by the EPA for environmental testing of all kinds of pollutants. They are very sensitive, so anything that affects them, may also affect humans.". Karimis advisors are Dr. Rockford Draper, professor of biological ...
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 ...
The epibenthic amphipod Hyalella azteca has long been used as a model organism for toxicity testing. However, current morphological identification of this amphipod has proven to be insufficiently descriptive. Recent ...
ABSTRACT: We present a simple method for describing the influence of variable attenuation of spectral irradiance, Kd(λ), on water-column photosynthesis and its inhibition by ultraviolet radiation (UV). The approach is based on weighted water transparency, a calculation introduced by Vincent et al. 1998 (Ann Glaciol 27:691-696). Key results of a depth- and spectrally-resolved model of photosynthesis can be reproduced for a broad range of water types by simple parameterizations using a reference solar irradiance spectrum at the surface and water transparency [1/Kd(λ)] weighted spectrally for biological effectiveness. Transparency that has been weighted spectrally by the normalized product of irradiance and photosynthetic absorption (PUR-weighted transparency, TWPUR) describes spectral effects on photosynthesis in the water column. An empirical parameterization of transparency weighted by the product of surface irradiance and the biological weighting function for inhibition of photosynthesis ...
It appears reasonable that potential exists for using corn distillers solubles for the controlled production of aquatic organisms (aquaculture). Results of initial laboratory studies which have focused on assessing the short-term effects of various concentrations of corn distillers solubles on water quality and aquatic organisms (fish, macrocrustaceans, microcrustaceans, and algae) are described. These results, coupled with results of studies currently in progress, will be used to identify a suitable quantity of corn distillers solubles for daily application to the earthen ponds that will be used in the field production trials. ...
By Glynn, Peter W Enochs, Ian C; McCosker, John E; Graefe, Abigail N Abstract: Adult individuals of the pearlfish Carapus mourlani (Petit, 1934) occur commonly in the mantle cavity of the opisthobranch mollusc Dolabella auricularia (Lightfoot, 1786) in shallow marine waters of the Gulf of Chiriqui, Pacific Panama. Nearly 30% of the molluscan hosts collected during the day on a coral reef contained one or two fish. Feeding observations of a captive fish as well as the intact condition of the hosts ctenidium and other internal organs suggest that C. mourlani is an inquiline commensal and not parasitic. Fish curl around the ctenidium during the day and capture microcrustaceans when the fish emerge from their host at night to feed. From low-light infrared video recordings, Carapus was observed to accurately grasp rapidly swimming amphipods in nearly total darkness and ingest them. This symbiotic relationship appears to benefit Carapus by allowing the fish to avoid predators during the day and to ...
A reliable quantitative structure retention relationship (QSRR) study has been evaluated to predict the retention indices (RIs) of a broad spectrum of compounds, namely 118 non-linear, cyclic and heterocyclic terpenoids (both saturated and unsaturated), on an HP-5MS fused silica column. A principal component analysis showed that seven compounds lay outside of the main cluster. After elimination of the outliers, the data set was divided into training and test sets involving 80 and 28 compounds. The method was tested by application of the particle swarm optimization (PSO) method to find the most effective molecular descriptors, followed by multiple linear regressions (MLR). The PSO-MLR model was further confirmed through “leave one out cross validation†(LOO-CV) and “leave group out cross validation†(LGO-CV), as well as external validations. The promising statistical figures of merit associated with the proposed model (R2train=0.936, Q2LOO=0.928, Q2LGO=0.921, F=376.4) confirm its
S. cerevisiae 200x H. sapiens A. dubia $10/bp $0.1/bp Genomová sekvenace 6/ 25/ genomových projektů: 199 kompletních (včetně 28 eukaryontních) 508 prokaryotických genomů před dokončením 421 eukaryotických genomů před dokončením nejmenší: archaebacterium Nanoarchaeum equitans 500 kb Bacillus anthracis (anthrax) 5228 kb S. cerivisiae (kvasinka) 12,069 kb Arabidopsis thaliana 115,428 kb Drosophila melanogaster (octomilka) 137,000 kb Anopheles gambiae 278,000 kb Oryza sativa (rýže) 420,000 kb Mus musculus (myš) 2,493,000 kb Homo sapiens (člověk) 2,900,000 kb www. genomesonline. org/ S. cerevisiae 200x H. sapiens A. dubia $10/bp $0.1/bp $0.01/bp
The water flea, Daphnia magna, is the canary of environmental toxicology. Scientists have found the flea to be sensitive to a wide array of toxic conditions. Unlike a mine, a river can contain multiple toxins, and a wide range of reasons why a
MIAMI - There are few venues in international football more intimidating than Mexicos 105,000 capacity Azteca Stadium but U.S. coach Bob...
The INNOQUA project aims to demonstrate that nature based-processes can treat wastewater - including the use of earthworms and water fleas.
Photo 1. Insanitary water supply being infected. Note the open infective lesions on this girls foot. Guinea worm occurs in parts of Africa, India, the Middle East and Brazil where water is drawn from shallow pools or primitive wells. Larvae are swallowed inside water fleas when unboiled water is drunk. The larvae emerge in the intestine from where they migrate to, and mature in the subcutaneous tissues.. ...
Our progress in understanding human genes has been amazing and humbling. About 150 years ago, Gregor Mendel used pea plants to establish some rules of inheritance, and about 50 years ago, Watson and Crick described the double helix of DNA. In 2003, the entire human genome was sequenced. Amazing!. What was humbling was that, when the number of genes in human cells were counted and compared to other organisms, our genome was considerably smaller than that of many other species. For example, humans have about 25,000 genes in each cell, while the tiny water flea has over 30,000! Scientists had assumed that due to our advanced abilities and organ structure, wed have over 100,000 genes.. While we dont have that many genes, scientists have very recently discovered ways to control the modest number we have, in an exciting new field called epigenetics. It explains how changes in gene activity can occur without changing our actual DNA.. One way that we can influence genes without changing their basic ...
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 ...
Die Grundlage mariner Nahrungsnetze bilden einzellige Algen (Phytoplankton), die sich durch ihre Fähigkeit zur Photosynthese autotroph ernähren (Primärproduzenten). Die heterotrophen Zooplankter ernähren sich als Primär- und Sekundärkonsumenten direkt oder indirekt vom Phytoplankton und bilden selbst die Nahrung für größere Tiere. Die Ausscheidungen des Zooplanktons bilden zusammen mit anderem organischen Material den sogenannten Meeresschnee (Seston), der ebenfalls von einigen Organismen als Nahrung genutzt wird. Unter den Nahrungsbeziehungen des Planktons kommt auch Parasitismus vor. Auch die Ausscheidungen von Planktonorganismen dienen anderen als Nahrung, so z.B. den Nauplius-Larven von Paramphiascella sp., eines benthischen Copepoden. Aus der DVD: DAHMS, HANS-UWE (Hongkong); FIEGE, DIETER (Frankfurt a. M.). Meeresplankton. (C 12863) ...
EXPERIMENTE AN LEBEWESEN, TIERVERSUCHE (BIOLOGISCHE TECHNIKEN); BRANCHIOPODA (ZOOLOGIE); EXPERIMENTS ON LIVING ORGANISMS, ANIMAL EXPERIMENTS (BIOLOGICAL TECHNIQUES); BRANCHIOPODA (ZOOLOGY ...
Species belonging to Penicillium section Aspergilloides have a world-wide distribution with P. glabrum, P. spinulosum and P. thomii the most well-known species of this section. These species occur commonly and can be isolated from many substrates including soil, food, bark and indoor environments. The taxonomy of these species has been investigated several times using various techniques, but species delimitation remains difficult. In the present study, 349 strains belonging to section Aspergilloides were subjected to multilocus molecular phylogenetic analyses using partial β-tubulin (BenA), calmodulin (CaM) and RNA polymerase II second largest subunit (RPB2) sequences. Section Aspergilloides is subdivided into 12 clades and 51 species. Twenty-five species are described here as new and P. yezoense, a species originally described without a Latin diagnosis, is validated. Species belonging to section Aspergilloides are phenotypically similar and most have monoverticillate conidiophores and grow ...
Prominent ear is the most common deformity of the external ear. The major causes can be an underdeveloped antithetical fold, concha hypertrophy, and prominence of the ear lobule. Since Elys first aes
View the latest weather forecasts, maps, news and alerts on Yahoo Weather. Find local weather forecasts for Caraubas Do Piaui, Brazil throughout the world
Get an answer for What is the difference between phytoplankton and zooplankton?Classify the 7 protists in these 2 categories. and find homework help for other Science questions at eNotes
Total phosphorus, 2009-2013 - Ministry for the Environment | New Zealand | GIS Map Data - Download GIS data as Shapefile (SHP), DWG, MapInfo, CSV, Google Earth (KML).
Find total phosphorus analyser articles on Environmental XPRT, the worlds largest environmental industry marketplace and information resource.
A free platform for explaining your research in plain language, and managing how you communicate around it - so you can understand how best to increase its impact.
clam shrimp: Any member of the crustacean order Conchostraca (subclass Branchiopoda), a group of about 200 species inhabiting shallow freshwater lakes, ponds, and temporary pools throughout...
È un po come nelle coppie daffari: se una delle due parti, volontariamente o no, subisce una trasformazione, per continuare a far funzionare lattività, laltra deve adattarsi e mutare di conseguenza per far fronte al cambiamento. Il salto dalle vicende imprenditoriali alla struttura delle proteine potrebbe sembrare un po ardito. Ma è proprio su questo principio di "abbinamento tra mutazioni" che si basa una nuova importante ricerca, appena pubblicata sulla rivista PNAS. Lo studio compie un significativo passo in avanti in un ambito tanto affascinante quanto complesso: quello che indaga la struttura tridimensionale delle proteine, cercando, in particolare, di risalire ai loro moduli strutturali fondamentali partendo dalla sola sequenza di amminoacidi che, come gli anelli di una catena, costituiscono lelemento base di queste macromolecole.. Lequipe di scienziati, composta da ricercatori della SISSA e della Temple University di Filadelfia, sono partiti da un dato di fatto: nella struttura ...
Todos nós nos sentimos atraidos pelo abismo. A (des)vantagem da idade é que aprendemos que por muito fundo que o abismo seja, se quisermos saltar podemos levantarmo-nos, sacudir a poeira e seguir em frente. Todos os ferimentos têm cura. Pode é demorar mais ou menos tempo... Agora, a excitação do salto, faz valer a pena cada hematoma ...
La técnica de MALDI Imaging permite detectar y localizar diferentes proteínas, péptidos o metabolitos directamente sobre un tejido, mediante espectrometría de masas se proporciona una imagen molecular del mismo. La combinación de la imagen molecular con las técnicas histológicas tradicionales ofrece un salto adelante en el campo de la histopatología para localizar biomarcadores.. Con el objeto de dar a conocer la técnica de MALDI Imaging, y el concepto de "Imagen molecular" del que Bruker es pionero. Se ha organizado un seminario el próximo día 22 de febrero, jueves en la SALA Legado Dolores Elosegui 2ºplanta, Centro Nacional de Investigaciones Oncológicas - CNIO. A las 12:00. Con la siguiente agenda:. ...
1858 Neil Avenue Mall, Columbus, OH 43210. Phone: (614) 292-OSUL (6785). If you have trouble accessing this page and need to request an alternate format, contact the webmaster.. ...
Greetings again from Aeropuerto OHare..... Heres the latest buzz from the windiest of cities: USA-Mexico at Azteca on Sept. 9, rumored to be in trouble, has been cancelled. USA-Brazil at Soldier Field on the same day has been agreed upon. Not a bad replacement match, huh? No reason given for...
Classification for Kingdom Plantae Down to Species Castilleja ambigua Hook. & Arn. Click on names to expand them, and on P for PLANTS profiles ...
Classification for Kingdom Plantae Down to Species Castilleja ambigua Hook. & Arn. Click on names to expand them, and on P for PLANTS profiles ...
During the spring breeding season throughout the channeled scablands of eastern Washington, metamorphosed male and female blotched tiger salamanders (Ambystoma tigrinum melanostictum) utilize oropharyngeal suction to capture large quantities of small aquatic invertebrates. Stomach content analysis on salamanders from three populations of this subspecies revealed that they consume the following taxa: Copepoda, Cladocera, Culicidae, Anostraca, and Chironomidae. Although the amount of energy obtained by adults via in-water feeding was not calculated, the large volume of aquatic invertebrate material flushed from salamander stomachs suggests that this feeding strategy should add significantly to their total annual nutrient consumption.
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 ...
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 ...
A comparative approach was taken in this study to evaluate androgen (androstenedione and testosterone) metabolism in three invertebrate species: the gastropod Marisa cornuarietis, the amphipod Hyalella azteca, and the echinoderm Paracentrotus lividus. The existence of 17β/3β-hydroxysteroid dehydrogenase (HSD) and 5α-reductase catalyzed reactions was demonstrated in all three species. Androstenedione was primarily converted to 5α-androstanedione in M. cornuarietis, while it was primarily metabolized to testosterone in P. lividus and H. azteca. In addition, and consistent with vertebrate findings, tissue specific pathways and sexual dimorphism in androgen metabolism were observed. Namely, testosterone was metabolized to dihydrotestosterone in P. lividus gonads (via 5α-reductase), and metabolized to 4-androstene-3β,17β-diol in the digestive tube (via 3β-hydroxysteroid dehydrogenase). Furthermore, the synthesis of 17β-reduced metabolites of androstenedione (testosterone and ...
The δ15N values of organisms are commonly used across diverse ecosystems to estimate trophic position and infer trophic connectivity. We undertook a novel cross-basin comparison of trophic position in two ecologically well-characterized and different groups of dominant mid-water fish consumers using amino acid nitrogen isotope compositions. We found that trophic positions estimated from the δ15N values of individual amino acids are nearly uniform within both families of these fishes across five global regions despite great variability in bulk tissue δ15N values. Regional differences in the δ15N values of phenylalanine confirmed that bulk tissue δ15N values reflect region-specific water mass biogeochemistry controlling δ15N values at the base of the food web. Trophic positions calculated from amino acid isotopic analyses (AA-TP) for lanternfishes (family Myctophidae) (AA-TP ~2.9) largely align with expectations from stomach content studies (TP ~3.2), while AA-TPs for dragonfishes (family Stomiidae)
Branchiopod crustaceans are represented by fairy, tadpole, and clam shrimps (Anostraca, Notostraca, Laevicaudata, Spinicaudata), which typically inhabit temporary freshwater bodies, and water fleas (Cladoceromorpha), which live in all kinds of freshwater and occasionally marine environments [1, 2]. The earliest branchiopods occur in the Cambrian, where they are represented by complete body fossils from Sweden such as Rehbachiella kinnekullensis [3] and isolated mandibles preserved as small carbonaceous fossils [4-6] from Canada. The earliest known continental branchiopods are associated with hot spring environments [7] represented by the Early Devonian Rhynie Chert of Scotland (410 million years ago) and include possible stem-group or crown-group Anostraca, Notostraca, and clam shrimps or Cladoceromorpha [8-10], which differmorphologically fromtheirmodern counterparts [1, 2, 11]. Here we report the discovery of an ephemeral pool branchiopod community from the 365-million-year-old Strud locality ...
Freshwater impoundments at Savannah National Wildlife Refuge (NWR), South Carolina, provide an important habitat for wildlife species, but degraded sediment quality in the Savannah River downstream of the discharge from two impoundments have caused concern about potential contaminant problems within the impoundments. The quality of sediments from five impoundments (impoundments no. 1, 2, 6, 7, and 17) on the NWR was evaluated using physical and chemical characterization, contaminant concentrations (metals, organochlorine pesticides, polychlorinated biphenyls, and polycyclic aromatic hydrocarbons), and toxicity testing. Survival of Hyalella azteca (freshwater amphipod) exposed for 28 days to solid-phase sediments was not significantly different from controls, but growth was significantly decreased at several sites. Survival in 96-hour exposures to sediment pore water was significantly decreased at most sites. Factors contributing to the toxic responses were low pH (3.7 to 4.1), ammonia (20 mg/L), and
As many of you have heard, I have a project in the 4th SciFund Challenge, a scientific research crowdfunding organization. My project, entitled "You are what you eat: non-lethal feeding ecology to help conserve threatened sharks," is part of my Ph.D. dissertation research. Youll be hearing a lot more about it over the new few weeks here, on twitter, and on my Facebook page once the challenge officially starts on February 1st. Id really appreciate your support of my research!. Ill be using a research technique called stable isotope analysis to study the diet and food web interactions of shark species in Florida. My project (and the research technique) will be briefly explained on my SciFund site, but I wanted to go into more detail about the type of research questions that stable isotope analysis can answer, as well as why this kind of data is significant.. Feeding ecology is important to the conservation and management of sharks.. An emerging trend in marine conservation is "ecosystem based ...

Cladocera - Simple English Wikipedia, the free encyclopediaCladocera - Simple English Wikipedia, the free encyclopedia

Cladocera is an order of small crustaceans commonly called water fleas. Around 620 species have been recognised so far, with ... L. Forró N.M. Korovchinsky, A.A. Kotov & A. Petrusek (2008). Global diversity of cladocerans (Cladocera; Crustacea) in ... Retrieved from "https://simple.wikipedia.org/w/index.php?title=Cladocera&oldid=5769819" ...
more infohttps://simple.wikipedia.org/wiki/Cladocera

Cladocerans - definition of Cladocerans by The Free DictionaryCladocerans - definition of Cladocerans by The Free Dictionary

Cladocera. (redirected from Cladocerans). Also found in: Medical, Encyclopedia.. Related to Cladocerans: water fleas Cla`doc´e` ...
more infohttp://www.thefreedictionary.com/Cladocerans

Influence of salinity on the life table demography of a rare Cladocera Latonopsis australisInfluence of salinity on the life table demography of a rare Cladocera Latonopsis australis

... Haridevan, G.; Jyothibabu, R.; ... Influence of salinity on the life table demography of a rare Cladocera Latonopsis australis. Login ... Latonopsis australis is a rare Cladocera inhabiting the entire stretch of the Cochin backwaters, the largest monsoonal estuary ...
more infohttp://drs.nio.org/drs/handle/2264/4841

Spatial distribution of juvenile and adult stages of limnetic Cladocera in relation to selected environmental factors
							|...Spatial distribution of juvenile and adult stages of limnetic Cladocera in relation to selected environmental factors |...

Environmental factors have a varied impact on the development of juvenile and adult Cladocera, depending on their different ... Adamczuk M. Spatial distribution of juvenile and adult stages of limnetic Cladocera in relation to selected environmental ... Trends in Ostracoda and Cladocera distribution and water chemistry in subarctic Canada: Churchill (Manitoba) lakes and ponds ... Adult Cladocera displayed spatial distribution related to fish predation pressure. The species selectively eaten, B. coregoni ...
more infohttps://www.jlimnol.it/index.php/jlimnol/article/view/4

Water flea eye, light micrograph - Stock Image C028/9152 - Science Photo LibraryWater flea eye, light micrograph - Stock Image C028/9152 - Science Photo Library

Water fleas (order Cladocera) are small crustaceans, commonly found in fresh water. They are filter feeders that ingest algae, ... Keywords: anatomical, anatomy, animal, animals, aquatic, biological, biology, branchiopod, cladocera, cladoceran, close-up, ... Water fleas (order Cladocera) are small crustaceans, commonly found in fresh water. They are filter feeders that ingest algae, ...
more infohttp://www.sciencephoto.com/media/719009/view

ASTM E1295 - 01(2013) Standard Guide for  Conducting Three-Brood, Renewal Toxicity Tests withASTM E1295 - 01(2013) Standard Guide for Conducting Three-Brood, Renewal Toxicity Tests with

These procedures should also be useful for conducting life cycle toxicity tests with other Cladocera (Guide E1193), although ...
more infohttps://www.astm.org/Standards/E1295.htm

Recent lake acidification and cladoceran dynamics: surface sediment and core analyses from lakes in Norway, Scotland and Sweden...Recent lake acidification and cladoceran dynamics: surface sediment and core analyses from lakes in Norway, Scotland and Sweden...

To interpret the remains of Cladocera in lake sediments in relation to pH history, fish abundance, vegetation change, trophic ...
more infohttp://rstb.royalsocietypublishing.org/content/327/1240/299

Phylogenomic analysis of Copepoda (Arthropoda, Crustacea) reveals unexpected similarities with earlier proposed morphological...Phylogenomic analysis of Copepoda (Arthropoda, Crustacea) reveals unexpected similarities with earlier proposed morphological...

Four fossil-based minimum ages were applied for the major splits; 497 MYA for the Diptera-Cladocera divergence, 405 MYA for the ... a group of Cladocera and Anostraca) was considered to belong to the subphylum Crustacea. However, this group was more closely ... Cladocera, Anostraca, Copepoda, Sessilia, Amphipoda, and Decapoda), the tree supports well the hypothesis of the three newly ... Cladocera, Sessilia, Amphipoda, and Decapoda) using 24 nuclear protein-coding genes. Phylogenomics has confirmed the monophyly ...
more infohttps://0-bmcevolbiol-biomedcentral-com.brum.beds.ac.uk/articles/10.1186/s12862-017-0883-5

Zooplankton abundance and species diversity in two lakes withZooplankton abundance and species diversity in two lakes with

Sampling date Rotifera Cladocera Copepoda Figure 3. Zooplankton abundance in the eutrophic and mesotrophic lakes. E: eutrophic ... Among Cladocera, Chydoridae (Chydorus pubescens, Alona spp.), Sididae (Diaphanosoma birgei, Ceriodaphnia cornuta and Daphnia ...
more infohttp://livrozilla.com/doc/380990/zooplankton-abundance-and-species-diversity-in-two-lakes-..

Cladocera - WikipediaCladocera - Wikipedia

Cladocera - Guide to the Marine Zooplankton of South Eastern Australia Media related to Cladocera at Wikimedia Commons Data ... The Cladocera are an order of small crustaceans commonly called water fleas. Around 620 species have been recognised so far, ... The order Cladocera is included in the class Branchiopoda, and forms a monophyletic group, which is currently divided into four ... The system evolved in the Permian, when the Cladocera arose. When conditions are favourable, reproduction occurs by ...
more infohttps://en.wikipedia.org/wiki/Cladocera

Cladocera (water fleas)Cladocera (water fleas)

Your basket is currently empty. i ,p>When browsing through different UniProt proteins, you can use the basket to save them, so that you can back to find or analyse them later.,p>,a href=/help/basket target=_top>More...,/a>,/p> ...
more infohttps://www.uniprot.org/taxonomy/6665

WoRMS - World Register of Marine Species - Glugea cladocera PfeifferWoRMS - World Register of Marine Species - Glugea cladocera Pfeiffer

Glugea cladocera Pfeiffer. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p= ...
more infohttp://www.marinespecies.org/aphia.php?p=taxdetails&id=559097

Raising Water Fleas as Live Food for Your Fish | Aquarium Cladocera | petMDRaising Water Fleas as Live Food for Your Fish | Aquarium Cladocera | petMD

Cladocera are commonly referred to as water fleas due to the hopping motion they make when moving about in the water. ... Cladocera are capable of both sexual and asexual reproduction. Parthenogenesis (which loosely means "virgin birth") is the ... Daphnia spp. and Moina spp. are closely related and belong to the animalia order Cladocera. ...
more infohttps://www.petmd.com/fish/nutrition/feeding-your-fish-live-foods-easy-daphnia-culture-freshwater-aquarist

Study of the evolution of the micro-crustacean group CladoceraStudy of the evolution of the micro-crustacean group Cladocera

These tiny crustaceans from the order Cladocera form the basis of the trophic pyramid and therefore play an important ... ... have now compiled a complete inventory of all known Cladocera species. "The Cladocera constitute a crucial group in our effort ... A search for organisms in any lake or puddle will very likely turn up a representative of the Cladocera. With more than 700 ... "Despite this wealth of species and habitats, little is known about the evolutionary history of the Cladocera," explains Dr. Kay ...
more infohttps://phys.org/news/2016-12-evolution-micro-crustacean-group-cladocera.html

Cladocera and geochemical evidence from sediment cores show trophic changes in Polish dystrophic lakes | SpringerLinkCladocera and geochemical evidence from sediment cores show trophic changes in Polish dystrophic lakes | SpringerLink

Guest editors: Marina Manca & Piet Spaak / Cladocera: Proceedings of the 9th International Symposium on Cladocera ... Cladocera as indicators of trophic state in Irish lakes. Journal of Paleolimnology 44: 465-481.CrossRefGoogle Scholar ... Atlas of Subfossil Cladocera from Central and Northern Europe. Friends of the Lower Vistula Society, Świecie.Google Scholar ... Danish Chydorid Cladocera: modern ecology and core studies. Ecological Monographs 40: 79-118.CrossRefGoogle Scholar ...
more infohttps://link.springer.com/article/10.1007/s10750-013-1482-0

Actualización de bases de datos de invertebrados (Rotifera, Cladocera y Copepoda) y pecesActualización de bases de datos de invertebrados (Rotifera, Cladocera y Copepoda) y peces

Vásquez Yeomans L, Ramos Rivera P (2017). Actualización de bases de datos de invertebrados (Rotifera, Cladocera y Copepoda) y ... Actualización de bases de datos de invertebrados (Rotifera, Cladocera y Copepoda) y peces Dataset homepage ...
more infohttps://www.gbif.org/dataset/805a8972-f762-11e1-a439-00145eb45e9a

Ecology of predator-induced morphological defense traits in Daphnia longispina (Cladocera, Arthropoda) | SpringerLinkEcology of predator-induced morphological defense traits in Daphnia longispina (Cladocera, Arthropoda) | SpringerLink

Ecology of predator-induced morphological defense traits in Daphnia longispina (Cladocera, Arthropoda). *Erik Sperfeld. ORCID: ... Benzie JAH (2005) Cladocera: The genus Daphnia (including Daphniopsis). Backhuys Publishers, Ghent, Kenobi Productions ... Kotov AA, Ishida S, Taylor DJ (2006) A new species in the Daphnia curvirostris (Crustacea: Cladocera) complex from the eastern ... Schwenk K, Sand A, Boersma M et al (1998) Genetic markers, genealogies and biogeographic patterns in the cladocera. Aquat Ecol ...
more infohttps://rd.springer.com/article/10.1007%2Fs00442-019-04588-6

Diversity and structure of microcrustacean assemblages (Cladocera and Copepoda) and limnological variability in perennial and...Diversity and structure of microcrustacean assemblages (Cladocera and Copepoda) and limnological variability in perennial and...

Diversidade, estrutura da assembleia de microcrustáceos (Cladocera e Copepoda) e variabilidade limnológica em poças perenes e ... Diversity and structure of microcrustacean assemblages (Cladocera and Copepoda) and limnological variability in perennial and ... Twenty-eight microcrustacean taxa were identified: 10 Cladocera, 3 Copepoda Calanoida and 15 Copepoda Cyclopoida (Tab. II). ... Spatial and seasonal variation of microcrustaceans (Cladocera and Copepoda) in intermittent rivers in the Jequiezinho River ...
more infohttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212011000300006

BRANCHIOPOD PHYLOGENY - CONTINUED MORPHOLOGICAL SUPPORT FOR HIGHER TAXA LIKE THE DIPLOSTRACA AND CLADOCERA, AND FOR PARAPHYLYOF...BRANCHIOPOD PHYLOGENY - CONTINUED MORPHOLOGICAL SUPPORT FOR HIGHER TAXA LIKE THE DIPLOSTRACA AND CLADOCERA, AND FOR PARAPHYLYOF...

BRANCHIOPOD PHYLOGENY - CONTINUED MORPHOLOGICAL SUPPORT FOR HIGHER TAXA LIKE THE DIPLOSTRACA AND CLADOCERA, AND FOR PARAPHYLYOF ... BRANCHIOPOD PHYLOGENY - CONTINUED MORPHOLOGICAL SUPPORT FOR HIGHER TAXA LIKE THE DIPLOSTRACA AND CLADOCERA, AND FOR PARAPHYLYOF ... BRANCHIOPOD PHYLOGENY - CONTINUED MORPHOLOGICAL SUPPORT FOR HIGHER TAXA LIKE THE DIPLOSTRACA AND CLADOCERA, AND FOR PARAPHYLYOF ...
more infohttp://booksandjournals.brillonline.com/content/journals/10.1163/156854002317373537

Unusual reaction of diatom assemblage on climate changes during the last millennium: a record from Spitsbergen lake |...Unusual reaction of diatom assemblage on climate changes during the last millennium: a record from Spitsbergen lake |...

Cladocera analysis. The cladoceran remains abundance was very low throughout the entire core and did not exceeded 200 ... Cladocera analysis. Samples for cladoceran analysis were prepared according to the standard procedure described by Korhola and ... Also a few Cladocera species appeared at the first time in the youngest samples. ... Korhola A, Rautio M (2001) Cladocera and other branchiopod crustaceans. In: Smol JP, Birks HJB, Last WM (eds) Tracking ...
more infohttps://link.springer.com/article/10.1007%2Fs10933-017-9962-2

Leptodora - WikipediaLeptodora - Wikipedia

Cladocera), with notes on the phylogeny of the Cladocera". Journal of Morphology. 256 (3): 235-259. doi:10.1002/jmor.10043.. ... "Cladocera as Model Organisms in Biology". Hydrobiologia. 307: 273-282. doi:10.1007/BF00032021.. ,chapter=. ignored (help) ... Wilhelm Lilljeborg (1900). Cladocera Sueciae; oder Beiträge zur kenntniss der in Schweden lebenden Krebsthiere von der Ordnung ... "Crustacea-Cladocera checkList" (PDF). Freshwater Animal Diversity Assessment (FADA) Project. Belgian Biodiversity Platform. ...
more infohttps://en.wikipedia.org/wiki/Leptodora

BranchiopodaBranchiopoda

Branchiopod phylogeny - Continued morphological support for higher taxa like the Diplostraca and Cladocera, and for paraphyly ... A phylogenetic analysis of the Conchostraca and Cladocera (Crustacea, Branchiopoda, Diplostraca). Zoological Journal of the ... An updated phylogeny of the Conchostraca-Cladocera clade (Branchiopoda, Diplostraca). Crustaceana 73:869-886. ...
more infohttp://www.tolweb.org/Branchiopoda/6243
  • This study attempted to resolve phylogenetic relationships among and within four major copepod orders including Harpacticoida and the phylogenetic position of Copepoda among five other crustacean groups (Anostraca, Cladocera, Sessilia, Amphipoda, and Decapoda) using 24 nuclear protein-coding genes. (beds.ac.uk)
  • 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 Chesson's coefficient λ) in deep Lake Piaseczno (eastern Poland). (jlimnol.it)
  • Environmental factors have a varied impact on the development of juvenile and adult Cladocera, depending on their different physiological conditions and body size. (jlimnol.it)
  • These procedures should also be useful for conducting life cycle toxicity tests with other Cladocera (Guide E1193 ), although modifications will be necessary. (astm.org)
  • Adult Cladocera displayed spatial distribution related to fish predation pressure. (jlimnol.it)
  • In their study, which was recently published in the scientific journal Earth-Science Reviews , the team of scientists presents the first comprehensive inventory of all Cladocera fossils in an ecological context. (phys.org)
  • Here, we examine the evolution of morphological, ecological, and life history characteristics of medusozoans, focusing on the taxa that occur en masse . (springer.com)
  • 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 Chesson's coefficient λ) in deep Lake Piaseczno (eastern Poland). (jlimnol.it)
  • Adult Cladocera displayed spatial distribution related to fish predation pressure. (jlimnol.it)
  • Cladocera are capable of both sexual and asexual reproduction. (petmd.com)
  • The Cladocera constitute a crucial group in our effort to understand the development of freshwater ecosystems throughout geological history ," says Van Damme in explanation of the team's motivation. (phys.org)
  • A search for organisms in any lake or puddle will very likely turn up a representative of the Cladocera. (phys.org)
  • 109.66194 (Cladocera Lake), el. (wikipedia.org)
  • Since then, the basic design of the Cladocera has hardly changed," says the biologist from Frankfurt, and he continues, "Nevertheless, this 'living fossil' was able to adapt very well to a variety of different environmental conditions . (phys.org)
  • Environmental factors have a varied impact on the development of juvenile and adult Cladocera, depending on their different physiological conditions and body size. (jlimnol.it)