Academic literature on the topic 'Eurytemora'
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Journal articles on the topic "Eurytemora"
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Lazareva, V. I. "Distribution of Eurytemora caspica Sukhikh & Alekseev, 2013 (Copepoda, Calanoida) in the water reservoirs of the Volga and Don river basins." Crustaceana 93, no. 3-5 (June 8, 2020): 261–73. http://dx.doi.org/10.1163/15685403-00003982.
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Abstract The zooplankton composition of the Volga, Kama and Don rivers was studied in the summers of 2015-2018. The copepod Eurytemora caspica Sukhikh & Alekseev, 2013, recently isolated from the group of species contained in Eurytemora affinis, represents a widespread (50-100% of samples) and relatively abundant (maximum abundance up to 18 × 103 ind./m3) species. It is found in the Lower and Middle Volga from the city of Astrakhan to the mouth of the Kama River, in the Kama River to the upper reaches of the Kama reservoir, in the lower and middle sections of the Don River within the Tsimlyansk reservoir, as well as in the reservoirs of the Volga-Don shipping canal. In the Kama River, E. caspica was discovered by the author for the first time in 2016. In other habitats, it was previously identified as Eurytemora affinis (Poppe, 1880), although this particular species was not found in any of the analysed samples. The distribution features and habitat conditions of Eurytemora caspica in the rivers of the basins of the Caspian and Azov seas are discussed.
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Krupa, Elena G. "The ecological preferences of Eurytemora affinis (Poppe, 1880) in the water bodies of Kazakhstan (Central Asia) and some notes about Eurytemora caspica Sukhikh & Alekseev, 2013." Crustaceana 93, no. 3-5 (June 8, 2020): 405–28. http://dx.doi.org/10.1163/15685403-00003967.
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Abstract The purpose of this work is to analyse the influence of external factors on quantitative variables of Eurytemora affinis in water bodies of Kazakhstan. In 1997-2018, more than 150 water bodies located in various regions of the country were surveyed. The results obtained and analysis of the published literature showed that E. affinis primarily inhabits small shallow water bodies of Central and Eastern Kazakhstan. Populations from the North-Eastern Caspian Sea, originally identified as “Eurytemora affinis”, could be attributed to the recently described species Eurytemora caspica. In the water bodies examined, E. affinis was found at water temperatures from 12 to 25°C and at salinities from 0.2 to 7.1 g/dm3. The highest abundance of Eurytemora was recorded at 21-22°C and a salinity of 1.0-3.0 g/dm3. The optimum temperature range in the water bodies examined in an extreme continental climate is higher than the values given for E. affinis in water bodies in a moderately temperate climate. The optimal TDS [Total Dissolved Solids] value (1.0-3.0 g/dm3) has shifted towards more truly fresh waters than was stated for E. affinis collected from the sea (6.2-8.2), and this was confirmed in experiments (from 3.0-10.0 to 10.0-15.0). In the majority of the examined water bodies of Kazakhstan, males dominated the Eurytemora populations. Male dominance in E. affinis populations might be due to the adverse effect of elevated temperature on the lifespan of females, and it was also connected with the level of toxic pollution of the water bodies. It seems that E. affinis endures a relatively high content of heavy metals, but it does not inhabit water bodies with very high toxic pollution. The revealed features of E. affinis’ biology in Kazakhstan water bodies might be associated with both the heterogeneity of its populations from different parts of the range, and the existence of a complex of closely related species that at present is collectively named “Eurytemora affinis”.
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Hoffmeyer, Monica S., Bruce W. Frost, and María B. Castro. "Eurytemora americana Williams, 1906, not Eurytemora affinis (Poppe, 1880), inhabits the Bahía Blanca estuary, Argentina." Scientia Marina 64, no. 1 (March 30, 2000): 111–13. http://dx.doi.org/10.3989/scimar.2000.64n1111.
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Lajus, Dmitry, Natalia Sukhikh, and Victor Alekseev. "Stochastic phenotypic variation: empirical results and potential use in Eurytemora research (Copepoda, Calanoida)." Crustaceana 93, no. 3-5 (June 8, 2020): 317–36. http://dx.doi.org/10.1163/15685403-00003983.
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Abstract This study analyses the potential of stochastic phenotypic variation for investigating the population biology of Eurytemora. Stochastic variation is the third component of phenotypic variance, standing on equal footing with genotypic variation and phenotypic plasticity. This is a manifestation of developmental instability and usually increases under stress. In morphological traits, stochastic variation is most often studied using fluctuating asymmetry (FA) of bilateral traits. Here, using data on the FA of nine populations of three Eurytemora species from Europe and North America, we found no correlation between FA and temperature, salinity or tidal amplitude. Invasive American E. carolleeae in the Gulf of Finland (Baltic Sea) had lower FA than the same species in its native Chesapeake Bay, or than E. affinis in its native Gulf of Finland. This pattern may be caused by global warming, which brought Chesapeake Bay temperatures beyond E. carolleeae’s optimal conditions, but made the Gulf of Finland a more suitable environment. Stochastic variation in life history traits is technically more difficult to study, but it may provide important information on fitness. In particular, it manifests in bet-hedging, a risk-spreading strategy beneficial in unpredictable environments. As resting eggs are common in Eurytemora, bet-hedging can be considered a genus strategy. Understanding how stochastic variation contributes to total phenotypic variance may help to interpret changes under unpredictable environmental conditions. Therefore, studies of stochastic phenotypic variation may supply information about the population biology of Eurytemora and other copepods.
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Astra, Labuce, Ikauniece Anda, Strāķe Solvita, and Souissi Anissa. "Survey of Presence of Non-Indigenous Eurytemora Carolleeae in the Gulf of Riga (Baltic Sea) Five Years After its First Discovery." Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences. 72, no. 4 (August 1, 2018): 230–35. http://dx.doi.org/10.2478/prolas-2018-0032.
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Abstract In the brackish ecosystem of the Gulf of Riga, the calanoid copepod Eurytemora affinis is a key species, but recently a new non-indigenous species Eurytemora carolleeae was discovered in the region. In the present study, we aimed to validate the presence of E. carolleeae in the southern part of the Gulf of Riga five years after its first discovery. The study area is the closest region to the Rīga harbour — the main source of non-indigenous species arrival in the Gulf. Recent studies have predicted the possible potential of E. carolleeae invasion due to its physiological plasticity. Male and female specimens of Eurytemora were collected in spring, summer, and autumn of 2013, and analysed based on three morphological indicators. Despite the higher reproduction rate of E. carolleeae, this intrusive species does not seem to have succeeded in establishing during the five-year period after its first discovery in the Gulf of Riga, and hence does not present a threat to the native E. affinis population in the study area.
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Gonzalez, Carole R. M., and Brian P. Bradley. "Salinity stress proteins in Eurytemora affinis." Hydrobiologia 292-293, no. 1 (January 1994): 461–68. http://dx.doi.org/10.1007/bf00229973.
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George, C. L., and J. A. Lindley. "Hatching Nauplii of Planktonic Calanoid Copepods from Intertidal Estuarine Sediments." Journal of the Marine Biological Association of the United Kingdom 77, no. 3 (August 1997): 899–902. http://dx.doi.org/10.1017/s0025315400036250.
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The dominant planktonic calanoid copepods in inshore and estuarine habitats in northern European waters; the Acartiidae, Centropagidae and Temoridae, produce eggs which survive and can remain dormant in the sediments (Marcus, 1996). Eggs of Eurytemora survived passage through the guts of fish larvae, in contrast with eggs of Pseudocalanus (Conway et al., 1994). Eggs of Paracalanus do not survive in sediments (Marcus, 1991). Lindley (1992) suggested that families within the superfamily Centropagoidea, including Eurytemora but not Paracalanus and Pseudocalanus, produce eggs which remain viable in sediments. Previous work on these eggs has been from subtidal sediments, although Naess (1996) showed that calanoid eggs survived in sediments in seasonally drained fish ponds.
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Sukhikh, Natalia, Ekaterina Abramova, Anne-Catherine Holl, Sami Souissi, and Victor Alekseev. "A comparative analysis of genetic differentiation of the E. affinis species complex and some other Eurytemora species, using the CO1, nITS and 18SrRNA genes (Copepoda, Calanoida)." Crustaceana 93, no. 8 (September 28, 2020): 931–55. http://dx.doi.org/10.1163/15685403-bja10074.
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Abstract Eurytemora represents a challenging group of species due to their taxonomy, in particular the former group of cryptic species known as E. affinis sensu lato. In this paper, we analyse DNA sequences that are all available in GenBank, along with our own data on the genus Eurytemora. For this study, a set of mitochondrial and nuclear genes (CO1, nITS and 18SrRNA) was used. In total 543 sequences were analysed (437 CO1; 54 nITS; 52 18SrRNA). However, this work is mainly meta-analytical, and only 67 sequences from unstudied earlier populations or species were obtained specifically for this work to analyse the genetic differentiation of the morphologically described species. We found that relatively young species of the E. affinis complex are different from each other in the CO1 and nITS genes, but not in the conservative 18SrRNA nuclear gene. Nucleotide differences among affinis-group species in the CO1 gene are 9.4-11.8%; in the nITS genes, 1.1-5.0%. At the same time, all other studied Eurytemora species have significant differences from each other in the CO1 and nITS genes, as well as in 18SrRNA. The level of differences among the species is 13.2-19.2% for the CO1 gene, 18.0-27.6.2% for nITS genes, and 0.4-1.8% for the 18SrRNA gene.
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Bradley, Brian P., Roxana Hakimzadeh, and James S. Vincent. "Rapid responses to stress in Eurytemora affinis." Hydrobiologia 167-168, no. 1 (October 1988): 197–200. http://dx.doi.org/10.1007/bf00026305.
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ALEKSEEV, VICTOR R., and ANISSA SOUISSI. "A new species within the Eurytemora affinis complex (Copepoda: Calanoida) from the Atlantic Coast of USA, with observations on eight morphologically different European populations." Zootaxa 2767, no. 1 (February 17, 2011): 41. http://dx.doi.org/10.11646/zootaxa.2767.1.4.
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Eurytemora carolleeae sp. nov. (Crustacea: Copepoda: Calaniformes) is described from the Chesapeake Bay, USA. The new species belongs to the Atlantic clade of the Eurytemora affinis complex outlined by previously published molecular work but poorly characterized morphologically. To discriminate E. carolleeae we compare specimens from the Atlantic USA clade with specimens from the type population of E. affinis (Poppe, 1880) from the Elbe River Estuary (Germany), as well as with eight other European coastal populations. Several important morphological characters clearly separate the North American E. cf. affinis from the European clade that include both sexes: a large outside orientated dent on the mandible, and clearly observable seta segmentation in the caudal rami and swimming legs. Unlike E. affinis, the newly described species possesses wing-like outgrowths on the genital double-somite and a very small spine near the distal seta insertion point in P5 in females. In males, the specific characters include naked dorsal and ventral sides of the caudal rami, and a cylindrical shape of exopod on the left P5, in contrast to a triangular shape of the segment in E. affinis. The new species was also found in Canada (St. Lawrence Estuary) and as an invasive species in the Baltic Sea. Eurytemora carolleeae is possibly widely distributed along the North American Atlantic coast, as well as in inland waters from Great Lakes to Mexico.
Dissertations / Theses on the topic "Eurytemora"
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Lee, Carol Eunmi. "Global phylogeography of the copepod species complex Eurytemora affinis and recent invasions of fresh water /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/11016.
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Lloyd, Scott Steven. "Zooplankton ecology in the Chesapeake Bay estuarine turbidity maximum, with emphasis on the calanoid copepod Eurytemora affinis." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3529.
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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.Thesis research directed by: Marine-Estuarine-Environmental Sciences. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Roddie, B. D. "Factors affecting the abundance and distribution of estuarine zooplankton, with special reference to the copepod Eurytemora affinis (Poppe)." Thesis, University of Stirling, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234909.
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In the field, a 12-month survey was conducted at 6 stations spanning a wide salinity range in the Forth estuary, to investigate the influence of geographical, seasonal, tidal and physical environmental variables on community structure. Pump samples, in two net fractions (69 urn and 250 um) were collected on spring and neap tides, at high and low water over 9 complete or partial lunar cycles. The use of two concentric nets of differing mesh size extended the size range of specimens caught, and permitted the observation and enumeration of small plankters such as rotifers, copepod nauplii and early polychaete larvae. In early 1982, a clear temporal succession of rotifers> freshwater crustacea> Haranzelleria larvae> Eurytemora was observed. The data acquired on field distribution and abundance were analysed in a variety of ways. The most effective approach was found to be a combination of polythetic, divisive classfication (Twinspan) of sepcies data, followed by Multiple Discriminant Analysis (MDA) of the classification using geographical, seasonal, tidal and environmental data as the discriminating variables. The effects of geographical, seasonal and tidal variation were removed by analysing subsets of the data restricted to one state of a variable at a time; comparison of these restricted analyses with those performed on larger data sets revealed, however, that the relative influence of variables on community structure could be readily discerned even when all variables were considered together. Salinity and geographical position of station were clearly the dominant factors in explaining the species associations defined by classification analysis; organic suspended particulate material was closely associated with these, and temperature also but to a lesser degree. The influences of season and primary production were linked, and were orthogonal to the influence of the dominant variables. Classification analysis identified three main assemblages: the freshwater community; a low-salinity group comprising Eurytemora affinis and Neomysis integer; A neritic assemblage dominated by Acartia spp., Pseudocalanus and Oithona but also including Temora, Centropages and meroplanktonic larvae. Pseudocalanus and Oithona were more persistent than the other neritic taxa, and were more often found in samples of lower salinity and in the autumn and winter. Predation and development rate are two biological factors which directly influence the abundance and distribution of individual taxa. In the laboratory, studies were conducted a) on the rate of predation of Neomysis on Eurytemora and b) the effects of temperature and food availability on the development rate of Eurytemora. Predation rates of adult mysids on adult Eurytemora were estimated to range up to 170 prey/day at 500 prey/litre, and the functional response was adequately modelled by a Type II curve. It was experimentally , demonstrated that predation rates were not reduced in the dark or in the presence of detritus, and it is inferred from this that Neomysis relies on random foraging rather than on visual predation. Estimated predation rates were sufficiently high to suggest that Neomysis predation may, at some times of the year, have a significant effect on Eurytemora population size. Development rates in Eurytemora were not affected by food level, but were quantitatively related to temperature. Development was approximately isochronal, but the duration of the second naupliar instar was consistently longer than that of other instars, especially at lower temperatures. Total estimated development times ranged from 39 days at 8 deg.C to 15.25 days at 20 deg.C, with the effect of temperature being more marked at low temperatures than at high temperatures. The results of the development study were applied to field observations of instar body lengths, in order to estimate daily length increment for 9 dates in 1982. Field observations had indicated that, in contrast to many other studies, body size did not bear a simple inverse relationship to water temperature; whilst the smallest animals were observed during the spring bloom .and midsummer, the largest specimens were collected in September when water temperatures were still high. Highest growth rates were estimated for August (small animals) and September (large animals) ; winter animals, although similar in size to September specimens, had low estimated growth rates. The large size of specimens encountered in September suggests, when considered in conjunction with the low abundance at that time, that a switch may have occurred from investment in reproduction to an investment in somatic growth.
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Ben, Radhia Anissa. "Etude de la plasticité reproductive et de la morphologie d’un copépode estuarien : comparaison intercontinentale." Thesis, Lille 1, 2010. http://www.theses.fr/2010LIL10166/document.
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Nous avons mis au point un nouveau protocole expérimental multi-générationnel permettant d’étudier la plasticité du copépode Eurytemora affinis dans le cadre d’un scénario de changement climatique. Cette espèce cryptique a été capable de se développer à des fortes températures et/ou salinités en montrant des effets de contrôle maternel et trans-générationnels sur ses traits de cycle de vie. Compte tenu de l’importance de la reproduction, nous avons étudié la stratégie reproductive des femelles, des mâles et de leur interaction. Nous avons mis en évidence, la présence de trade-off entre la fécondité et la taille de l’œuf chez le copépode. Nous avons également montré une nette différence entre les populations transatlantiques d’E. affinis. L’analyse détaillée des rôles du mâle et de la femelle dans la reproduction des copépodes a été illustrée pour la population d’E. affinis provenant de la Seine. Nos résultats ont révélé que ; le mâle contribue activement à la reproduction puisqu’il est capable d’identifier les femelles prêtes à s’accoupler, la femelle est capable de s’accoupler avec plusieurs mâles et d’utiliser pour une même portée le matériel génétique de plusieurs pères. Il semble qu’un sex-ratio en faveur des males offre des avantages avérés à la population d’E. affinis de l’estuaire de la Seine. Les résultats de cette thèse confirment le grand potentiel de ce copépode comme modèle biologique et soulignent l’importance d’intégrer la plasticité des organismes vivants et leur capacité d’adaptation aux variations de la température ainsi que d’autres facteurs environnementaux dans le cadre des effets du changement climatique sur les écosystèmesWe developed a new multigenerational experimental protocol allowing to study the plasticity of the copepod Eurytemora affinis within the framework of a climate change scenario. This cryptic species was capable to develop under high temperatures and/or salinities, showing trans-generational and maternal control effects on its life cycle traits. By considering the importance of the reproduction, we studied the reproductive strategy of females, males and their interaction. We underlined the presence of trade-off between the fecundity and the offspring size in copepods. We also showed a clear difference between the transatlantic populations of E. affinis.The detailed analysis of the respective roles of the male and the female in the reproduction of copepods was illustrated for the population of E. affinis from the Seine. Our results revealed that; the male contributed actively to the reproduction being able to identify females ready to mate; the female was capable of multiple mating and of using the genetic material of several fathers for the same clutch. It seems that a sex-ratio in favor of males offered clear advantages to the population of E. affinis from the Seine estuary.The results of this thesis confirmed the high potential of this copepod as biological model and underlined the importance of integrating the plasticity of the living organisms and their capacity of adaptation to temperature variations or any other environmental factors within the framework of the effects of climate change on the ecosystems
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Legrand, Eléna. "Couplage d’approches écotoxicogénomiques chez le copépode estuarien Eurytemora affinis et d’outils bio-analytiques pour l’évaluation du caractère perturbateur endocrinien des contaminants aquatiques : exemple de deux pesticides modèles : le pyriproxyfène et la chlordécone, seuls et en mélange." Thesis, Le Havre, 2016. http://www.theses.fr/2016LEHA0007/document.
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Les écosystèmes aquatiques constituent la destination finale des contaminants. Les organismes aquatiques sont ainsi impactés par un cocktail de molécules, dont les produits phytosanitaires. Le caractère perturbateur endocrinien (PE) de certains d’entre eux est particulièrement préoccupant. La présente étude explore les effets de pesticides modèles à potentiel PE – la chlordécone (CLD) et le pyriproxyfène (PXF), seuls et en mélange – chez le copépode estuarien Eurytemora affinis par des approches écotoxicogénomiques innovantes. En réponse aux PE, l’accent a été porté sur les effets de ces composés sur la reproduction, la croissance ou le développement. En parallèle, l’affinité des pesticides aux récepteurs aux oestrogènes et aux androgènes humains d’une part, et aux ecdystéroïdes d’autre part, a été étudiée grâce à des outils bio analytiques afin d’évaluer la pertinence de l’utilisation du potentiel PE défini par les tests cellulaires comme critère d’exclusion dans la réglementation européenne des pesticides. Ces travaux de thèse présentent, pour la première fois, les transcriptomes et protéomes d’E. affinis après exposition aux PE. Un effet sexe-dépendant a été observé par les deux approches « omics » révélant un plus fort impact des composés sur les copépodes mâles. Des gènes et protéines, impliqués dans le processus de mue et dans la gamétogénèse ont été identifiés comme candidats pour le développement de biomarqueurs moléculaires de PE chez les crustacés. Les tests cellulaires ont permis de mettre en évidence des interactions entre les contaminants et les récepteurs hormonaux. Toutefois, le screening de molécules par les tests YES/YAS/anti-YES/anti-YAS s’est heurté à quelques limites d’interprétations. Enfin, les résultats du test S2 EcR, souligne la pertinence de l'utilisation couplée de tests spécifiques d’un système endocrinien de vertébrés et d’invertébrés dans l’évaluation du risque des composés PEAquatic ecosystems constitute the chemicals’ final destination. Among the xenobiotics, endocrine disruptors (ED) are compounds of major concern. In this context, ED pesticides effects were investigated in the widespread copepod Eurytemora Affinis using ecotoxicogenomics technics. In response to PE pesticides, focus was made on reproduction, growth and development. In order to evaluate the endocrine activity, in vitro tests (YES/YAS/anti-YES/anti-YAS and S2 EcR) were used to screen the compounds alone and in mixtures. These results were discussed to evaluate the “cut off criterion” used in European assessment. This work presents for the first time, transcriptomes and proteomes of E. affinis after PXF and CLD –alone and in binary mixture- exposure. A sex dependent effect was observed by the two “omics” approaches. Male copepods were more impacted by contaminants than female copepods. Genes and proteins (e.g. chitin deacetylase, kelch protein) were identified as candidates for the development of ED molecular biomarkers. In vitro tests highlighted binding of pesticides with both vertebrate and invertebrate receptors. However, a toxicity for the highest concentrations tested and some limits for the interpretation of mixtures results were limiting in YES/YAS/anti-YES/anti-YAS assays. The last observation represents particularly a major concern for interpretation of the ED mode of action of environmental matrix. S2 EcR highlighted some complementary results about the mode of action of chemicals alone and in binary mixtures. These results accentuate the need to combine vertebrate specific test and invertebrate specific test in ED risk assessment
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Chambord, Sophie. "Rôle du mésozooplancton dans un estuaire restauré : l'Escaut." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30237/document.
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L'estuaire de l'Escaut est un estuaire en voie de restauration. L'étude s'intéresse à l'écologie de la communauté zooplanctonique dans le tronçon d'eau douce de l'Escaut, ou, suite à l'amélioration de la qualité de l'eau le copépode calanoide Eurytemora affinis est devenu dominant depuis 2007 et les copépodes cyclopoïdes ont diminués en abondance. Nous avons cherché à trouver quels facteurs environnementaux expliquent ce changement de la composition de la communauté zooplanctonique. Les résultats d'analyses RDA et GLM entre les abondances des taxons zooplanctoniques et les facteurs environnementaux montrent un lien étroit entre l'augmentation de l'abondance d'E. affinis et l'augmentation des concentrations en oxygène ainsi que la diminution des concentrations en N-NH4. En fait, le tronçon amont de l'estuaire est devenu 'permissive' pour le développement d'E. affinis à partir ou la concentration en O2 a dépassé le seuil de 4 mg L-1 et la concentration en N- NH4 est restée en dessous de 2 mg L-1. La cause du déclin en abondance des cyclopoids reste à trouver. Dans l'Escaut, le phytoplancton est fortement dominé par les diatomées, mais la concentration en Si dissoute s'avère parfois limitant. La question se pose sur quelles composantes de la communauté phytoplanctonique le zooplancton dominant se nourrit. La sélectivité de broutage d'E. affinis a été quantifiée à l'aide d'expériences d'incubation et des quantification de contenu pigmentaire à l'aide d'HPLC. E. affinis sélectionne des diatomées au sein de la communauté phytoplanctonique et en moindre mesure des cryptomonades. L'impact de la population d'E. affinis sur le stock de phytoplancton - et sur les diatomées dominantes- est < 4.5 % jour-1, ce qui implique que dans le tronçon d'eau douce de l'Escaut le zooplancton n'est pas limité par la nourriture et ne présente pas de limitation pour le développement les niveaux trophiques supérieurs. Certains taxons phytoplanctoniques (chlorophycées, par exemple) sont apparemment stimulés en croissance par la présence d'E. affinis dans les bouteilles expérimentales et l'impact précis d'E. affinis sur le phytoplancton non-diatomées est moins clair. L'activité de broutage du microzooplancton a également été testée avec des expériences d'incubation. Son impact sur la communauté phytoplanctonique est variable en intensité et en sélectivité, nécessitant plus d'expérimentationThe Scheldt is an estuary on way of recovery. The study concerns the ecology of the zooplankton community in the freshwater reach of the estuary. In parallel to water quality improvement, the copepod Eurytemora affinis has become dominant since 2007 and abundance of cyclopoid copepods has decreased. We tried to find out which environmental factors had caused these changes in the zooplankton community composition. The results of RDA and GLM analysis between the abundance of zooplankton taxa and the environmental factors showed a strong link between E. affinis abundance and the increasing O2 concentration, but also the decreasing NH4-N concentration. The upstream Scheldt became permissive for E. affinis development as soon as oxygen concentration was above the threshold level of 4 mg L-1 and the NH4-N concentration remained below 2 mg L-1. The cause of the decrease in cyclopoid abundance remains unclear. The phytoplankton community of freshwater Scheldt is strongly dominated by diatoms, but the dissolved silica concentration could become limiting for their development. The question arises on which phytoplankton taxa the dominant zooplankton feeds. Grazing selectivity of E. affinis adults and CV was measured by incubation experiments using natural Scheldt water and by gut pigment content quantification. Phytoplankton taxa concentration was quantified by HPLC. E. affinis selects diatoms and sometimes cryptophytes. The impact of the E. affinis population on the phytoplankton standing stock is < 4.5% d-1, which means that the zooplankton community is not food limited and hence does not present a limitation to the development of higher trophic levels. The grazing activity of the microzooplankton community has also been measured by incubation experiments. Its impact on the freshwater Scheldt phytoplankton community is variable in intensity and in selectivity, and clearly needs further investigation
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Cailleaud, Kévin. "Utilisation du copépode Eurytemora affinis pour étudier l'écodynamique et les effets biologiques des principaux composants organiques (PCB, HAP, Alkylphénols. . . ) en estuaire de Seine." Bordeaux 1, 2006. http://www.theses.fr/2006BOR13265.
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Les estuaires sont des écocystèmes soumis à de fortes pressions anthropiques et reçoivent de ce fait des qualités importantes de contaminants organiques d'origines diverses (industrielle, agricole, domestique). A ce titre, l'estuaire de Seine est considéré comme l'un des estuaires les plus pollués au monde. Toutefois, en dépit des nombreuses sources de contamination, un copépode plantonique, Eurytemora affinis, s'y est largement développé jusqu'à atteindre pendant la période maximale de production, des concentrations équivalentes à dix fois celles observées dans la pluspart des autres estuaires Nord Atlantiques pourtant moins pollués (1 000 000 endividus m-3). Dans ce contexte, un état des lieux de la contamination de l'estuaire a été réalisé au cours d'un suivi in situ de deux années afin d'identifier les contaminants organiques majeurs de l'estuaire et de déterminer leurs niveaux de concentration. Les cycles biogéochimiques de trois principales classes de contaminants, les HAP et les PCB majoritairement adsorbés sur la phase particulaire, ainsi que les alkylpphénols polyéthoxylés aussi bien dissous que adsorbés sur la phase particulaire, ont été clairement mis en évidence, aussi bien à l'échelle saisonnière qu'à l'échelle d'une marée. Des transferts de ces contaminants vers le compartiment biologique ont été mis en évidence notamment chez E. Affinis qui représentait des teneurs particulièrement élevées de ces contaminants, de l'ordre du microgramme/g de poids sec. En se basant sur l'état des lieux défini au cours du suivi in situ, des expériences d'exposition au laboratoire du copépode E. Afinis à divers contaminants organiques sélectionnés ont été réalisées en flux continu. . . . . . .
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Beyrend, Delphine. "Life history traits of key brackish copepods from temperate to tropical environments." Thesis, Lille 1, 2010. http://www.theses.fr/2010LIL10120.
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L’étude de la dynamique de populations du plancton apporte un nouvel aperçu de l’effet du changement du climat sur les milieux aquatiques. Cependant, un besoin réel existe d’une vue d’ensemble de ces effets possible en se basant sur des comparaisons entre les sites à des échelles appropriées. La France et Taïwan sont des pays situés sous des climats contrastés principalement tempéré pour la France et subtropical/tropical pour Taïwan. En France, le copépode saumâtre Eurytemora affinis, connue comme espèce clef en région tempérée, a été le sujet de nombreuses études en laboratoire et sur le terrain. P. annandalei est une espèce dominante de copépode saumâtre mais dans en régions subtropicale/tropical de l’Indopacifique qui n’a pas été bien étudiée malgré son importance écologique et économique. Dans cette thèse, on a étudié l’histoire de vie du copépode P. annandalei particulièrement l’effet de la température et salinité ainsi que d’autres aspects comme la biologie de la reproduction pour comprendre sa dynamique de population en milieu naturel. On a aussi étudié la dynamique de population de copépodes dominants dans deux estuaires contrastés comprenant P. annandalei et E. affinis respectivement dans les estuaires du Danshuei (subtropical) et de la Seine (tempéré). L’étude de l’histoire de vie de P. annandalei a révélé l’importance de la température, salinité et leurs interactions dans sa stratégie de cycle de vie. Il est capable de se développer et reproduire dans une large gamme de température-salinité cependant il montre une meilleure fitness à 25-30°C et à salinité 15. L’étude sur le terrain montre que les dynamiques de populations de copépodes sont influencées par différent facteurs environnementaux dans les deux systèmes comme l’apport en eaux douces dans l’estuaire tempéré de Seine et les typhons dans l’estuaire subtropical du Danshuei. Nos résultats trouveront certainement des intérêts et des applications en dynamique de population des copépodes subtropicaux/tropicaux et dans l’aquaculture ainsi qu’en écologie de systèmes saumâtres principalement subtropicaux dans le contexte de changement global du climatThe study of the plankton population dynamics brings new insights on the effects of the global climate change on aquatic ecosystems. However, there is a real need to have a global overview of these effects through inter-site comparisons at appropriate scales. France and Taiwan are two countries located in contrasting climate regimes, respectively temperate and subtropical/tropical. In France, the temperate brackish copepod Eurytemora affinis which is known as key species has been the subject of numerous laboratory and field studies. P. annandalei which is also a dominant brackish copepod but in subtropical/tropical Indo-Pacific regions found in Taiwan, has not been well studied despite its ecological and economical importance. In this thesis we studied the life history of the copepod P. annandalei particularly the effects of temperature-salinity interactions and other aspects such as the reproductive biology to understand its population dynamics in the field. We also investigate the population dynamics of dominant copepods in two contrasting estuaries including P. annandalei and E. affinis respectively in the subtropical Danshuei Estuary and the temperate Seine Estuary. The main originality of this work was to use similar protocols in laboratory and in the field observations in the two contrasting systems. The life history study of P. annandalei highlighted the importance of temperature and salinity in its life cycle strategy. It is able to develop and reproduce in a wide range of temperature-salinity conditions however it showed better fitness at temperature 25-30°C and salinity 15. The field studies showed that the population dynamics of copepods was driven by different environmental factors in the two contrasting systems such as the river discharge in the temperate Seine Estuary and the typhoons in the subtropical Danshuei Estuary. Finally our result may find some interests and applications in subtropical/tropical copepod population dynamics and in industrial aquaculture as well as in the ecology of subtropical brackish systems within the global climate change context
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Mialet, Benoît. "Réponse du zooplancton à la restauration de l'estuaire de l'Escaut et test d'un modèle de sélectivité trophique." Phd thesis, Université Paul Sabatier - Toulouse III, 2010. http://tel.archives-ouvertes.fr/tel-00741853.
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La réponse de la communauté de crustacés zooplanctoniques de l'estuaire de l'Escaut à l'amélioration de la qualité de l'eau a été étudiée (1996-2009). A partir de 2007, on observe un déplacement des calanoïdes de l'eau saumâtre vers l'eau douce, associée à une forte diminution des cyclopides en eau douce. Contrairement aux cyclopides et aux cladocères, la distribution spatio-temporelle des calanoïdes a répondu positivement à une amélioration de la qualité de l'eau. Nos résultats suggèrent un basculement du régime trophique d'Eurytemora affinis des organismes autotrophes vers des organismes hétérotrophes. Enfin, en vue de tester un modèle de sélectivité trophique en milieu estuarien dans un écosystème benthique, le comportement sélectif des rotifères du périphyton de la Garonne (France) a été analysé. Les résultats ont suggéré une sélection positive envers les cyanobactéries qui, en notre connaissance, a été mise en évidence pour la première fois dans ce milieu.
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Kadiene, Esther Uzoma. "Effect of heavy metal toxicity on calanoid copepods : experimental approach." Thesis, Lille, 2019. http://www.theses.fr/2019LIL1R017.
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Cette thèse cible les facteurs biotiques qui influent sur la toxicité des métaux chez les copépodes calanoïdes. Tout d'abord, la toxicité du cadmium (Cd) entre deux copépodes de l'ordre; calanoida Eurytemora affinis (Poppe 1880) d'une région tempérée (estuaire de la Seine, France) et Pseudodiaptomus annandalei (Sewell 1919) d'une région subtropicale (estuaire de Danshuei, Taiwan), ont été déterminés sur la base de leur sexe et de leur état de reproduction. Les résultats de cette étude ont révélé que les deux copépodes avaient des niveaux de sensibilité différents à la toxicité du cadmium et que leur sensibilité au cadmium était également fortement dépendante de leur sexe et de leur état de reproduction. En outre, une étude de la toxicité du cadmium dans les traits de vie du copépode a été testée en utilisant P. annandalei comme espèce modèle. Les résultats ont révélé que la toxicité du cadmium était également dépendante du stade de développement des copépodes. De plus, le Cd a eu un effet négatif sur la croissance, la reproduction et la durée de vie du copépode. Afin de comprendre la raison de la sensibilité au cadmium spécifique au sexe, la bioaccumulation du cadmium chez les deux sexes a été réalisée. De plus, dans les environnements naturels, les copépodes peuvent bioaccumuler les métaux via une voie directe dans l’eau ou via les aliments consommés. Dans un premier temps, des essais préliminaires ont été effectués pour identifier la cinétique de bioaccumulation des métaux chez les micro-algues utlisées pour nourrir les copépodes. L'accumulation du Cd dans les microalgues a été testée en exposant Pavlova lutheri dans différentes conditions de salinité et température. À la fin, il a été observé que l’augmentation de la température et la faible salinité favorisent l’absorption de Cd par les micro-algues. P. annandalei a ensuite été exposé au cadmium dans l'eau et par le biais de son régime alimentaire, en utilisant les informations fournies par les résultats ci-dessus. Cette expérience a révélé que l'absorption de Cd par P. annandalei provenait nettement plus d'eau que de la nourriture. Une hypothèse a été développée sur les raisons pour lesquelles l'absorption de Cd par l'eau par les copépodes était plus élevée que par l'exposition par Cd via l’aliment. En d’autres termes, l’absorption de métaux par l’eau est une voie plus importante dans la bioaccumulation des métaux que par la voie alimentaire en raison de l’absorption orale. L'hypothèse a été démontrée en exposant les copépodes à un colorant alimentaire et, à l'aide d'un microscope, il a été constaté que le colorant était entré dans l'intestin du copépode par l'ouverture de la bouche. L'absorption orale d'eau par le copépode a été confirmée par un test de bioaccumulation. Une étude moléculaire sur le test transcriptomique et l'expression différentielle spécifique au sexe du copépode de P. annandalei exposé au Cd a été réalisée. Les résultats ont montré que les copépodes de P. annandalei répondaient à la toxicité du cadmium de manière spécifique au sexe, et expliquaient pourquoi la femelle était moins sensible au cadmium que les copépodes mâles. De plus, l'exposition multigénérationnelle de P. annandalei au cadmium a montré un développement possible de l'adaptation, en particulier chez les copépodes femelles. Bien que les copépodes puissent développer des mécanismes adaptatifs pour tolérer les produits chimiques toxiques, une concentration croissante de métaux dans le milieu aquatique ainsi que des transferts de métaux par la mère sur plusieurs générations pourraient augmenter la concentration de copépodes. Une exposition à long terme pourrait réduire leur forme, compromettant ainsi la structure de la population de copépodes. Cette étude a montré que la mortalité, les traits d'histoire de vie et les réponses moléculaires des espèces modèles peuvent fournir d'importants bioindicateurs pour l'évaluation des risques environnementauxAs a result of the growing concerns about the fate of copepod ecology in the face of increasing environmental pollutants, several studies are being carried out. This thesis focused on biotic factors that influences metal toxicity in calanoid copepods. Firstly, cadmium (Cd) toxicity between two copepods in the order; calanoida; Eurytemora affinis (Poppe 1880) from a temperate region (Seine Estuary, France) and Pseudodiaptomus annandalei (Sewell 1919) from a subtropical region (Danshuei Estuary, Taiwan), was determined based on their sex and reproductive states. Results from this investigation revealed that both copepods have different levels of sensitivity to cadmium toxicity and also, their sensitivity to cadmium was significantly dependent on their sexes and reproductive states. In addition, an investigation of cadmium toxicity in copepod life history traits were further tested using P. annandalei as a model specie. The results revealed that Cd toxicity was also dependent on the developmental stages of the copepods. In addition, Cd showed negative effect on the growth, reproduction and lifespan of the copepod. Furthermore, to understand the reason for sex-specific sensitivity to cadmium, an investigation on the bioaccumulation of Cd was carried out. Moreover, in the natural environments, copepods could bioaccumulate metals either directly from the water or indirectly from consumed diets. Before, both routes of metal uptake were tested, some preliminary test was carried out on the rate at which copepod diet (microalgae) take up metal. Microalgae accumulation of Cd was tested by exposing Pavlova lutheri to Cd under different conditions (salinity and temperature). At the end, it was observed that increased temperature and low salinity influenced the uptake of Cd in the algae. P. annandalei was then exposed to Cd in water and through their diets, using the information from the above results. This investigation revealed that P. annandalei uptake of Cd was significantly more from water than from the diets. A hypothesis was developed based on why copepod uptake of Cd from water was higher than from dietary Cd exposure. That is, metal uptake from water is a more important route in the bioaccumulation of metals than through dietary route because of oral intake. The hypothesis was demonstrated by exposing copepods to a dyed medium, and with the aid of a microscope, the dyed medium was observed to have entered inside the gut of the copepod through the mouth opening. Oral intake of water by copepod was confirmed by a bioaccumulation test. A molecular study on the transcriptomic assay and sex-specific differential expression of P. annandalei copepod exposed to Cd was carried out. The results showed that P. annandalei copepod responded to Cd toxicity in a sex-specific manner, and why female was less sensitive to Cd than male copepods were discussed. Moreover, multigenerational exposure of P. annandalei to Cd showed a possible development of adaptation, particularly in the female copepods. Although, copepods could develop adaptive mechanisms to tolerate toxic chemicals, however, an increasing concentration of metals in the aquatic environment in addition to maternal transfers of metals over several generations could increase the concentration in copepods. A long term exposure could reduce their fitness, thereby compromising copepod population structure. This study showed that mortality, life history traits and molecular responses of model species can provide important bio-indicators for environmental risk assessment
Books on the topic "Eurytemora"
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W, Hall Lenwood, and Chesapeake Bay Program (U.S.), eds. Acute and chronic toxicity of copper to the estuarine copepod Eurytemora affinis: Final report. Annapolis, Md: Printed by the U.S. Environmental Protection Agency for the Chesapeake Bay Program, 1998.
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W, Hall Lenwood, and Chesapeake Bay Program (U.S.), eds. Standard operating procedures for conducting acute and chronic aquatic toxicity tests with Eurytemora affinis, a Calanoid copepod. Annapolis, Md: Printed by the U.S. Environmental Protection Agency for the Chesapeake Bay Program, 1998.
Find full textBook chapters on the topic "Eurytemora"
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Gonzalez, Carole R. M., and Brian P. Bradley. "Salinity stress proteins in Eurytemora affinis." In Ecology and Morphology of Copepods, 461–68. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-017-1347-4_58.
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Bradley, Brian P., Roxana Hakimzadeh, and James S. Vincent. "Rapid responses to stress in Eurytemora affinis." In Biology of Copepods, 197–200. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3103-9_17.
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Ban, Syuhei, and Takashi Minoda. "Induction of diapause egg production in Eurytemora affinis by their own metabolites." In Ecology and Morphology of Copepods, 185–89. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-017-1347-4_25.
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Peitsch, Andrea. "Production rates of Eurytemora affinis in the Elbe estuary, comparison of field and enclosure production estimates." In Major Biological Processes in European Tidal Estuaries, 127–37. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-009-0117-9_11.
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Dodson, Stanley I., Daniel A. Skelly, and Carol Eunmi Lee. "Out of Alaska: morphological diversity within the genus Eurytemora from its ancestral Alaskan range (Crustacea, Copepoda)." In Fifty years after the ‘‘Homage to Santa Rosalia’’: Old and new paradigms on biodiversity in aquatic ecosystems, 131–48. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9908-2_11.
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Castel, Jacques. "Long-term changes in the population of Eurytemora affinis (Copepoda, Calanoida) in the Gironde estuary (1978–1992)." In Major Biological Processes in European Tidal Estuaries, 85–101. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-009-0117-9_8.
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Viitasalo, Markku, Tarja Katajisto, and Ilppo Vuorinen. "Seasonal dynamics of Acartia bifilosa and Eurytemora affinis (Copepoda: Calanoida) in relation to abiotic factors in the northern Baltic Sea." In Ecology and Morphology of Copepods, 415–22. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-017-1347-4_52.
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"Salinity effects on egg production, hatching, and survival of Eurytemora affinis (Copepoda, Calanoida)." In Studies on Eurytemora, 189–205. BRILL, 2021. http://dx.doi.org/10.1163/9789004465565_013.
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"On time and place of origin of continental calanoid families: a hypothesis." In Studies on Eurytemora, 5–20. BRILL, 2021. http://dx.doi.org/10.1163/9789004465565_003.
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"Differential eco-physiological performances of two pseudocryptic species of the Eurytemora affinis complex (Copepoda, Calanoida) in the St. Lawrence estuarine transition zone: a reciprocal transplant experiment." In Studies on Eurytemora, 139–64. BRILL, 2021. http://dx.doi.org/10.1163/9789004465565_011.
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