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Journal articles on the topic 'Eurytemora'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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.

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11

Fefilova, Elena, Natalia Sukhikh, Ekaterina Abramova, and Ilya Velegzhaninov. "About the systematics of Palaearctic Eurytemora (Copepoda, Calanoida) based on morphological analysis, with focus on Eurytemora gracilicauda Akatova, 1949." Crustaceana 93, no. 3-5 (June 8, 2020): 299–315. http://dx.doi.org/10.1163/15685403-00003976.

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Abstract We studied the morphology of Eurytemora from inland waters at the shores of the White and Pechora seas and from the Lena River delta, and revealed a ubiquitous presence of Eurytemora gracilicauda Akatova, which results we confirmed with genetic data. We found this species for the first time in the Pechora Sea basin. In the White Sea basin, this species was previously described as E. brodskyi Kos, with the name that we suggest is a junior synonym of E. gracilicauda. E. gracilicauda differs from the co-living species: E. lacustris (Poppe), E. arctica Wilson M. S. & Tash, and E. raboti Richard, by the structure and armament of the caudal rami and the fifth legs (P5) of males and females. The caudal rami of both males and females were elongated. The female caudal rami showed a surface covered by spines. The male caudal rami were bare, or with rare spines on the sides. The appendages of the female P5 were also elongated: the length of the inner spine on the distal exopod segment was 2.27 ± 0.12 times as long as the outer spine; the exopod of the male right P5 had a specific trigonal ledge with a short spinule, and the coxopods (both or at least one) had groups of spinules. The morphometric parameters of the females were quite stable, while those of the male showed high variability within and between populations (CV = 11.5-43.5%). Similarities and differences of E. gracilicauda and three allochoric Eurytemora species were analysed, and the results presented herein.

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12

Sukhikh, Natalia, Anissa Souissi, Sami Souissi, Anne-Catherine Holl, Nikolaos V. Schizas, and Victor Alekseev. "Life in sympatry: coexistence of native Eurytemora affinis and invasive Eurytemora carolleeae in the Gulf of Finland (Baltic Sea)." Oceanologia 61, no. 2 (April 2019): 227–38. http://dx.doi.org/10.1016/j.oceano.2018.11.002.

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13

Chen, Mianrun, Dongyoung Kim, Hongbin Liu, and Chang-Keun Kang. "Variability in copepod trophic levels and feeding selectivity based on stable isotope analysis in Gwangyang Bay of the southern coast of the Korean Peninsula." Biogeosciences 15, no. 7 (April 9, 2018): 2055–73. http://dx.doi.org/10.5194/bg-15-2055-2018.

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Abstract. Trophic preference (i.e., food resources and trophic levels) of different copepod groups was assessed along a salinity gradient in the temperate estuarine Gwangyang Bay of Korea, based on seasonal investigation of taxonomic results in 2015 and stable isotope analysis incorporating multiple linear regression models. The δ13C and δ15N values of copepods in the bay displayed significant spatial heterogeneity as well as seasonal variations, which were indicated by their significant relationships with salinity and temperature, respectively. Both spatial and temporal variations reflected those in isotopic values of food sources. The major calanoid groups (marine calanoids and brackish water calanoids) had a mean trophic level of 2.2 relative to nanoplankton as the basal food source, similar to the bulk copepod assemblage; however, they had dissimilar food sources based on the different δ13C values. Calanoid isotopic values indicated a mixture of different genera including species with high δ15N values (e.g., Labidocera, Sinocalanus, and Tortanus), moderate values (Calanus sinicus, Centropages, Paracalanus, and Acartia), and relatively low δ15N values (Eurytemora pacifica and Pseudodiaptomus). Feeding preferences of different copepods probably explain these seasonal and spatial patterns of the community trophic niche. Bayesian mixing model calculations based on source materials of two size fractions of particulate organic matter (nanoplankton at < 20 µm vs. microplankton at 20–200 µm) indicated that Acartia and Centropages preferred large particles; Paracalanus, Calanus, Eurytemora, and Pseudodiaptomus apparently preferred small particles. Tortanus was typically carnivorous with low selectivity on different copepods. Labidocera preferred marine calanoids Acartia, Centropages, and harpacticoids; on the other hand, Sinocalanus and Corycaeus preferred brackish calanoids Paracalanus and Pseudodiaptomus. Overall, our results depict a simple energy flow of the planktonic food web of Gwangyang Bay: from primary producers (nanoplankton) and a mixture of primary producers and herbivores (microplankton) through omnivores (Acartia, Calanus, Centropages, and Paracalanus) and detritivores (Pseudodiaptomus, Eurytemora, and harpacticoids) to carnivores (Corycaeus, Tortanus, Labidocera, and Sinocalanus).

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14

Hirche, H. J. "Egg production of Eurytemora affinis—Effect of k-strategy." Estuarine, Coastal and Shelf Science 35, no. 4 (October 1992): 395–407. http://dx.doi.org/10.1016/s0272-7714(05)80035-6.

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15

Winkler, Gesche, Sami Souissi, Céline Poux, and Vincent Castric. "Genetic heterogeneity among Eurytemora affinis populations in Western Europe." Marine Biology 158, no. 8 (May 10, 2011): 1841–56. http://dx.doi.org/10.1007/s00227-011-1696-5.

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16

Andersen, CM, and TG Nielsen. "Hatching rate of the egg-carrying estuarine copepod Eurytemora affinis." Marine Ecology Progress Series 160 (1997): 283–89. http://dx.doi.org/10.3354/meps160283.

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17

Hakimzadeh, Roxana, and Brian P. Bradley. "The heat shock response in the copepod Eurytemora affinis (POPPE)." Journal of Thermal Biology 15, no. 1 (January 1990): 67–77. http://dx.doi.org/10.1016/0306-4565(90)90050-r.

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18

Wright, David A. "Fecundity of Eurytemora affinis as an in situ toxicity bioassay." Marine Environmental Research 28, no. 1-4 (January 1989): 544–45. http://dx.doi.org/10.1016/0141-1136(89)90313-9.

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19

Hoffmeyer, Mónica S., Anabela A. Berasategui, Débora Beigt, and María C. Piccolo. "Environmental regulation of the estuarine copepods Acartia tonsa and Eurytemora americana during coexistence period." Journal of the Marine Biological Association of the United Kingdom 89, no. 2 (July 30, 2008): 355–61. http://dx.doi.org/10.1017/s0025315408001987.

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The seasonal dynamics of Acartia tonsa and the invader Eurytemora americana were analysed in relation to the environmental variability occurring from April to November in the Bahía Blanca Estuary. Twice a month, the abundance of eggs, nauplii, copepodites and adults was examined and some environmental variables were recorded. Multivariate statistics (CCA) was applied to analyse the data of variables. Acartia tonsa eggs and nauplii diminished from April–May and they were almost absent between June and September, although a small larval peak could be detected from the end of July to October. All the stages of this species increased in number through spring. Eurytemora americana was registered as from June and only nauplii larvae were observed, with a peak increase during September. Copepodites and adults were observed as from July, increasing in number until peaking at the end of September. The number of all stages of this species decreased abruptly, the whole population disappearing from the plankton. The A. tonsa developmental stages were most positively correlated with temperature, photoperiod and other light variables whereas those of E. americana showed positive correlations with chlorophyll-a and salinity. The gradients of the main environmental factors likely give rise to a certain niche separation facilitating the coexistence of the two copepod populations within the period studied.

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20

Kuismanen, Lauri, Louise Forsblom, Jonna Engström-Öst, Ulf Båmstedt, and Olivier Glippa. "Salinity effects on egg production, hatching, and survival of Eurytemora affinis (Copepoda, Calanoida)." Crustaceana 93, no. 3-5 (June 8, 2020): 429–45. http://dx.doi.org/10.1163/15685403-00003988.

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Abstract Salinity is an important biodiversity regulating factor in the Baltic Sea, forming a physiological dispersal barrier for species. The salinity in the Baltic Sea has been predicted to decline due to increased precipitation and fewer saline water inflows from the ocean. This causes stress to species already living on the edge of their tolerances and can alter species compositions and interactions in ecosystems. Calanoid copepod resting eggs, originating from a known egg bank on the seabed in the western Gulf of Finland, were incubated in the laboratory. We monitored the hatching of the calanoid copepods Acartia sp. and Eurytemora affinis, as well as the survival to maturity of hatched Eurytemora affinis nauplii in salinities ranging from 0 to 25. Further, we also investigated salinity-related effects on body size and egg production. Based on the results of our generalized linear mixed model, peak hatching occurred within the salinity range 5-20 (6.3 at the study site). Body size was not affected by salinity and most eggs were produced in salinities of 5, 7.5 and 15. The results suggest that E. affinis lives on the edge of an optimal salinity and that a decline of salinity could affect the fitness of the local populations of the species.

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21

Wang, Yan-Guo, Li-Chun Tseng, Rou-Xin Sun, Zhi-Yong Liu, Mao Lin, and Jiang-Shiou Hwang. "Effects of the China Coastal Current on the community structure of planktonic copepods in early spring, with notes on Eurytemora pacifica Sato, 1913 in the western Taiwan Strait." Crustaceana 93, no. 3-5 (June 8, 2020): 487–506. http://dx.doi.org/10.1163/15685403-00004010.

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Abstract The Taiwan Strait, located between Taiwan Island and the southeast of the mainland of China, is the main passageway connecting the East China Sea and the South China Sea. The particular coastline of the mainland created several semi-enclosed embayments along the west coast of the Taiwan Strait. Runoffs from land bring large amounts of nutrients into the bays, which made these bays important natural spawning and breeding grounds for several economically important marine organisms. In order to reveal the effects of the China Coastal Current (CCC) on the zooplankton communities in Fuqing Bay in northeastern Fujian, zooplankton samples were collected at 12 stations in early March 2014. The average surface seawater temperature was 12.53 ± 0.14°C, and salinity was 28.33 ± 0.21 PSU in the investigation area during the research period. In total, 23 identified copepod species and in addition several unidentified benthic harpacticoid copepods were recorded with an average abundance of 77.44 ± 60.07 ind. m−3. In the present study, the most dominant group consisted of juveniles (copepodites) with an average density of 59.97 ± 51.49 ind. m−3, which was followed by Calanus sinicus Brodsky, 1965 with an average density of 5.04 ± 4.95 ind. m−3. The occurrence rate of Calanus sinicus was 91.67% in our study, which indicates that the research area was controlled by the CCC water mass. So, we concluded that the CCC played an important role in transporting cold water copepod species from the Bohai Sea and the Yellow Sea to the western Taiwan Strait. A noteworthy discovery in our samples was Eurytemora pacifica Sato, 1913, which was recorded for the first time in waters of the western Taiwan Strait with an occurrence rate of 33.33% and an average density of 0.81 ± 1.91 ind. m−3. Eurytemora pacifica was first reported at Yantai harbour and is widely distributed in waters of the northern Pacific Ocean. The co-occurrence of Calanus sinicus and Eurytemora pacifica in our research area possibly indicates that E. pacifica could be used as a bioindicator for the directional movement of the CCC. The high occurrence of this species in our research area indicated that the CCC affects the community structure of copepods in the western Taiwan Strait in early spring.

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22

Krupa, Elena, and Moldir Aubakirova. "Checklist and Distribution of Calanoida (Crustacea: Copepoda) in Kazakhstan (Central Asia)." Water 13, no. 15 (July 23, 2021): 2015. http://dx.doi.org/10.3390/w13152015.

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This work aims to analyze the zoogeographic distribution of Calanoida in Kazakhstan. Kazakhstan belongs to the Palaearctic region, and its territory is ascribed to the European–Siberian and Nagorno–Asian biogeographical subregions. The European–Siberian subregion includes the Volga–Ural, Irtysh, and Turkestan–Aral provinces. The Balkhash province belongs to the Nagorno–Asian subregion. Studies of the Calanoida fauna were carried out between 1997 and 2019. For this purpose, 7250 zooplankton samples were taken in 130 different water bodies. Findings of 26 species of Calanoida have been documented. The richest in species composition (20) is the Calanoida fauna of the Irtysh province. Ten Calanoida species have been recorded in the Volga–Ural province, 8 in the Turkestan–Aral province, 7 in the Balkhash province, and 5 in the Ponto–Caspian region. The distribution of the species richness of the order is determined by a complex of climatic factors, including the density of the hydrographic network, a variety of hydrochemical conditions, and accidental acclimatization of species. Far Eastern species (Sinodiaptomus sarsi, Neutrodiaptomus incongruens, Neodiaptomus schmackeri) entered the inland water bodies of Kazakhstan, most likely through the introduction of non-native fish species. The Black Sea species Acartia tonsa and Calanipeda aquaedulcis were introduced into the Caspian Sea with ballast waters. Three autochthonous species (Limnocalanus macrurus, Eurytemora grimmi, Eurytemora minor), formerly inhabiting the Caspian Sea, can now be considered extinct. Acanthodiaptomus denticornis, Arctodiaptomus (R.) salinus, Phyllodiaptomus blanci, and Eudiaptomus graciloides are widespread in the region. Endemic species (Gigantodiaptomus irtyshensis, Arctodiaptomus naurzumensis) and species are new for Kazakhstan (Diaptomus (Chaetodiaptomus) mirus, Eudiaptomus transylvanicus, Arctodiaptomus dentifer, A. (Rh.) ulomskyi were found in small waterbodies; they are known only from single occurrence sites as well as Eurytemora caspica. The last one was described from the northern part of the Caspian Sea, in the coastal zone. Further research into small water bodies that are poorly studied may expand our knowledge of the diversity of Calanoida in Kazakhstan. Calanoida fauna of Kazakhstan was closest to the fauna of countries with a continental climate and most strongly differed from countries with subtropical and Mediterranean types of climates.

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23

Rasch, Ellen M., Carol Eunmi Lee, and Grace A. Wyngaard. "DNA–Feulgen cytophotometric determination of genome size for the freshwater-invading copepod Eurytemora affinis." Genome 47, no. 3 (June 1, 2004): 559–64. http://dx.doi.org/10.1139/g04-014.

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Variation in nuclear DNA content within some eukaryotic species is well documented, but causes and consequences of such variation remain unclear. Here we report genome size of an estuarine and salt-marsh calanoid copepod, Eurytemora affinis, which has recently invaded inland freshwater habitats independently and repeatedly in North America, Europe, and Asia. Adults and embryos of E. affinis from the St. Lawrence River drainage were examined for somatic cell DNA content and the presence or absence of embryonic chromatin diminution, using Feulgen–DNA cytophotometry to determine a diploid or 2C genome size of 0.6–0.7 pg DNA/cell. The majority of somatic cell nuclei, however, have twice this DNA content (1.3 pg/nucleus) in all of the adults examined and possibly represent a population of cells arrested at the G2 stage of the cell cycle or associated with some degree of endopolyploidy. Both suggestions contradict assumptions that DNA replication does not occur in adult tissues during the determinate growth characteristic of copepods. Absence of germ cell nuclei with markedly elevated DNA values, commonly found for species of cyclopoid copepods that show chromatin diminution, indicates that E. affinis lacks this trait. The small genome size and presumed absence of chromatin diminution increase the potential utility of E. affinis as a model for genomic studies on mechanisms of adaptation during freshwater invasions.Key words: copepod, genome size, DNA–Feulgen, calanoid, Eurytemora.

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24

Сухих, Н. М., В. И. Лазарева, and В. Р. Алексеев. "Копепода Eurytemora caspica (Crustacea, Calanoida) в водохранилищах рек Волги и Камы." Биология внутренних вод, no. 2 (2020): 129–36. http://dx.doi.org/10.31857/s0320965220020163.

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25

Brenning, Ulrich, and Andreas Busch. "Studies On the Status of Eurytemora Affinis (Poppe, 1880) (Copepoda, Calanoida)." Crustaceana 62, no. 1 (1992): 13–38. http://dx.doi.org/10.1163/156854092x00028.

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Фефилова, Е. Б., Н. М. Сухих, Е. Е. Расова, И. О. Велегжанинов, and Е. Н. Абрамова. "НОВЫЕ ДАННЫЕ О РАССЕЛЕНИИ EURYTEMORA GIESBRECHT (Copepoda: Calanoida) В РОССИЙСКОЙ АРКТИКЕ." Доклады Российской академии наук. Науки о жизни 492, no. 1 (2020): 242–45. http://dx.doi.org/10.31857/s268673892003004x.

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27

Choi, Beom-Soon, Jeonghoon Han, Dae-Sik Hwang, Sami Souissi, Atsushi Hagiwara, and Jae-Seong Lee. "Complete mitochondrial genome of the calanoid copepod Eurytemora affinis (Calanoida, Temoridae)." Mitochondrial DNA Part B 4, no. 2 (July 3, 2019): 2731–33. http://dx.doi.org/10.1080/23802359.2019.1644558.

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28

Berasategui, Anabela A., Mónica S. Hoffmeyer, M. Sofía Dutto, and Florencia Biancalana. "Seasonal variation in the egg morphology of the copepod Eurytemora americana and its relationship with reproductive strategy in a temperate estuary in Argentina." ICES Journal of Marine Science 69, no. 3 (January 2, 2012): 380–88. http://dx.doi.org/10.1093/icesjms/fsr192.

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Abstract Berasategui, A. A., Hoffmeyer, M. S., Dutto, M. S., and Biancalana, F. 2012. Seasonal variation in the egg morphology of the copepod Eurytemora americana and its relationship with reproductive strategy in a temperate estuary in Argentina. – ICES Journal of Marine Science, 69: 380–388. Seasonal variation in the morphology of Eurytemora americana eggs and its relationship with reproductive strategy were studied in the Bahía Blanca Estuary. Eggs from field females were analysed morphologically by optical (OM) and electron microscopy [scanning electron microscopy (SEM)–transmission electron microscopy (TEM)] during the population pulse. Additionally, egg-carrying females were incubated simulating in situ environmental conditions to evaluate the resting egg character. Subitaneous and resting eggs were indistinguishable by OM, but showed different chorion appearance under SEM and TEM. Sinuous patterned chorion eggs, mainly produced during the period of population growth, were classed as subitaneous eggs based on their high level of hatching success. Eggs with a sponge-like appearance, produced after the population peaked, were classed as diapause eggs based on their inability to hatch even under favourable conditions. There were significant differences in egg size through the population pulse and diapause eggs were significantly bigger than subitaneous eggs. The observation of both morphotypes in egg-carrying females after peak population abundance confirms the existence of a transitional reproductive stage before the exclusive production of diapause eggs at the end of the pulse. Diapause egg production enables E. americana to resist adverse conditions, ensuring its survival in temperate estuaries.

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Lee, Carol Eunmi. "Rapid and Repeated Invasions of Fresh Water by the Copepod Eurytemora affinis." Evolution 53, no. 5 (October 1999): 1423. http://dx.doi.org/10.2307/2640889.

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Lee, Carol Eunmi. "RAPID AND REPEATED INVASIONS OF FRESH WATER BY THE COPEPOD EURYTEMORA AFFINIS." Evolution 53, no. 5 (October 1999): 1423–34. http://dx.doi.org/10.1111/j.1558-5646.1999.tb05407.x.

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31

Ban, Syuhei, and Takashi Minoda. "Induction of diapause egg production in Eurytemora affinis by their own metabolites." Hydrobiologia 292-293, no. 1 (January 1994): 185–89. http://dx.doi.org/10.1007/bf00229940.

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32

Gaudy, R., and M. Pagano. "Biologie d'un copépode des mares temporaires du littoral méditerranéen français: Eurytemora velox." Marine Biology 94, no. 3 (April 1987): 335–45. http://dx.doi.org/10.1007/bf00428239.

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33

Cabrol, Jory, Réjean Tremblay, and Gesche Winkler. "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." Crustaceana 93, no. 3-5 (June 8, 2020): 379–404. http://dx.doi.org/10.1163/15685403-00003973.

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Abstract The goal of this study was to evaluate and compare the short-term performances and the physiological plasticity of two cryptic species Eurytemora carolleeae and Eurytemora affinis (North-Atlantic clade) by simulating rapid advection from freshwater to brackish water conditions and reciprocally. To do so, two reciprocal transplant experiments without acclimation and under non-limited food condition were performed in the St. Lawrence estuarine transition zone during summer 2011. Results revealed that both species diverged in their short-term acclimation response when facing acute salinity changes that they might encounter when advected through the highly dynamic estuarine transition zone. We show that E. carolleeae could use the brackish environment without loss of performance and energy, while E. affinis needed to reallocate energy from other processes (i.e., reproduction) and required food intake to maintain itself in the freshwater environment. In addition, the transplant experiment highlighted that only 40% of the E. affinis showed short term capacity to acclimate to freshwater conditions, indicating that in situ advection by currents from brackish water to fresh water could be dramatic even for a short time period. Furthermore, the survivors of E. affinis in fresh water might not be able to reproduce, which limits establishment of a sustainable population of E. affinis (North-Atlantic clade) in the tidal freshwater part of the estuarine transition zone. Finally, we highlighted for the first time that both species of this pseudocryptic complex could use lipid remodelling to overcome temperature effects on membrane structure, but further studies are needed to determine the influence of membrane lipid remodelling on salinity tolerance.

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Samchyshyna, Larysa, Yulia Gromova, and Kateryna Zorina-Sakharova. "Recent distribution of Eurytemora velox (Lilljeborg, 1853) (Copepoda, Calanoida) in brackish and fresh waters of Ukraine." Crustaceana 93, no. 3-5 (June 8, 2020): 275–81. http://dx.doi.org/10.1163/15685403-00003992.

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Abstract The brackish water calanoid copepod Eurytemora velox has become a widespread species in inland fresh waters of Ukraine. Nowadays it is one of the dominant crustacean species in the littoral zooplankton of the main Ukrainian rivers: Dnieper, Danube and Pivdenny Buh. We present a survey on E. velox localities in, mainly, fresh waters of Ukraine, data on some quite isolated populations of E. velox in the Carpathian region, as well as new records of the species in the upper parts of some rivers. These data will provide a more complete view of the inland distribution of E. velox in Ukraine.

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Timpe, Alexander W., and Bart T. De Stasio. "Comparison of respiration rate and electron transport system (ETS) enzyme-mediated reduction assay of the invasive copepod Eurytemora carolleeae Alekseev & Souissi, 2011 (Calanoida, Temoridae) in Green Bay, WI, U.S.A." Crustaceana 93, no. 3-5 (June 8, 2020): 467–85. http://dx.doi.org/10.1163/15685403-00003990.

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Abstract Anthropogenic activities can cause important changes in aquatic ecosystems, such as warming due to climate change, nutrient loading from agricultural runoff and urban areas, and decreased concentrations of oxygen in bottom waters. These changes may lead to impacts on both organism performance and ecosystem functionality. Studying planktonic species that form an aquatic ecosystem’s foundation is an important step towards understanding the entire food web and predicting how it may respond to a changing environment. One important planktonic species in the Laurentian Great Lakes is the invasive calanoid copepod Eurytemora carolleeae (formerly considered part of the Eurytemora affinis species complex). This study analyzes the metabolic activity of E. carolleeae from Green Bay, Lake Michigan, U.S.A. using two different methods, over a range of temperatures from 9 to 26°C. Total oxygen consumption was measured directly using a micropulse oxygen probe system, and the activity of aerobic metabolic enzymes in the electron transport system (ETS) was quantified using in vitro reduction of iodonitrotetrazolium chloride (INT). Respiration rate of E. carolleeae increases approximately linearly from 9 to 26°C. Measurements of ETS activity indicate that the copepod’s metabolic enzymes have an Arrhenius activation energy of 46.5 ± 15.6 kJ/mol with a thermal maximum between 22 and 26°C. Overall, E. carolleeae ETS rates increased by approximately 7% per °C over the range 9 to 22°C. This thermal limit has implications for future performance of this species, as the combination of higher temperatures and disappearance of oxygenated colder-water refuges may limit E. carolleeae’s success in the Green Bay system following warmer climate and increased nutrient conditions.

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Sopanen, S., P. Uronen, P. Kuuppo, C. Svensen, A. Rühl, T. Tamminen, E. Granéli, and C. Legrand. "Transfer of nodularin to the copepod Eurytemora affinis through the microbial food web." Aquatic Microbial Ecology 55 (April 23, 2009): 115–30. http://dx.doi.org/10.3354/ame01289.

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37

Vasquez, Adrian A., Patrick L. Hudson, Masanori Fujimoto, Kevin Keeler, Patricia M. Armenio, and Jeffrey L. Ram. "Eurytemora carolleeae in the Laurentian Great Lakes revealed by phylogenetic and morphological analysis." Journal of Great Lakes Research 42, no. 4 (August 2016): 802–11. http://dx.doi.org/10.1016/j.jglr.2016.04.001.

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38

Lloyd, Scott S., David T. Elliott, and Michael R. Roman. "Egg production by the copepod, Eurytemora affinis, in Chesapeake Bay turbidity maximum regions." Journal of Plankton Research 35, no. 2 (January 17, 2013): 299–308. http://dx.doi.org/10.1093/plankt/fbt003.

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39

Castonguay, Marjolaine, and Gerard J. FitzGerald. "The ecology of the calanoid copepod Eurytemora affinis in salt marsh tide pools." Hydrobiologia 202, no. 3 (August 1990): 125–33. http://dx.doi.org/10.1007/bf00006839.

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40

Minguez, Jérémy, Tom Maris, Micky Tackx, Charles Gers, Patrick Meire, and Luc Legal. "Genetics of the estuarine copepod Eurytemora affinis with regard to improving water quality." Estuarine, Coastal and Shelf Science 246 (November 2020): 107037. http://dx.doi.org/10.1016/j.ecss.2020.107037.

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41

Hough, A. R., and E. Naylor. "Endogenous rhythms of circatidal swimming activity in the estuarine copepod Eurytemora affinis (Poppe)." Journal of Experimental Marine Biology and Ecology 161, no. 1 (October 1992): 27–32. http://dx.doi.org/10.1016/0022-0981(92)90187-f.

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42

Baptie, Malcolm Charles, Rosemary Jayne Foster, and Kathryn Barbara Cook. "First record of the copepod Eurytemora herdmani in the Firth of Forth, Scotland." Marine Biodiversity 46, no. 4 (January 23, 2016): 819–25. http://dx.doi.org/10.1007/s12526-015-0440-7.

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43

Karlsson, Konrad, and Monika Winder. "Adaptation potential of the copepod Eurytemora affinis to a future warmer Baltic Sea." Ecology and Evolution 10, no. 11 (May 15, 2020): 5135–51. http://dx.doi.org/10.1002/ece3.6267.

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44

Taylor, C. J. L. "The zooplankton of the Forth, Scotland." Proceedings of the Royal Society of Edinburgh. Section B. Biological Sciences 93, no. 3-4 (1987): 377–88. http://dx.doi.org/10.1017/s0269727000006825.

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SynopsisA description of the community structure of the Forth estuary's zooplankton was obtained by sampling monthly at nine stations ranging from fresh water to fully marine conditions for an eighteen-month period. The variation in species abundance and distribution is related to environmental variables. The apparent spatial and temporal successions of members of the Acartia species complex are described, as are the episodes of predation spreading from the firth and the domination of the upper estuary by Eurytemora. It is observed that the estuary of the Forth is rare among British estuaries in its ability to support a truly pelagic self-maintaining assemblage of species.

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45

Alekseev, Victor R., and Natalia M. Sukhikh. "On time and place of origin of continental calanoid families: a hypothesis." Crustaceana 93, no. 3-5 (June 8, 2020): 245–60. http://dx.doi.org/10.1163/15685403-00004014.

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Abstract Several independent methods: molecular-genetic, biogeographical, and morphological analyses — were applied to explain the origin of the continental calanoid fauna and the distribution of their recent genera. The theory of Continental Drift and the evolution of the Tethys Sea were also used for that purpose. The molecular-genetic-based phylogenetic tree that we constructed, as well as the largest number of genera and species in Diaptomidae, allow us to support the idea that this family of fresh- and brackishwater Copepoda arose earlier than the Temoridae and Centropagidae. The ancestors of the Diaptomidae likely invaded, and were distributed across, the supercontinent Pangaea before its division into two continental plates in the Mesozoic Era, i.e., not later than 180-200 Ma. Therefore, various genera of this family can be found almost everywhere on all continents, except Antarctica. The family Temoridae is known only from Europe, Asia and North America. These three continental plates stayed together long after separation of Pangaea into two parts: Laurasia and Gondwana (until circa 50 Ma). At approximately the same time (50 Ma), the genus Eurytemora should have been created, as its representatives are known from North America and Eurasia. The family Centropagidae seems to have invaded inland waters somewhere between Temoridae and Diaptomidae, as its representatives can be found on all continents except Africa. Also, as a possibly alternative option, this centropagid invasion could have happened independently in the northern and southern Pangaea blocks, by different marine ancestors, at the same time as Temoridae, as is shown herein in the molecular-genetic-based phylogenetic tree. Using the evolution model of the Tethys Sea proved to be very productive for explaining the modern ranges of continental calanoids, both within families and in individual genera, including the genus Eurytemora.

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Karpowicz, Maciej, and Krystyna Kalinowska. "Vertical distribution of the relic species Eurytemora lacustris (Copepoda, Calanoida) in stratified mesotrophic lakes." Biologia 73, no. 12 (October 26, 2018): 1197–204. http://dx.doi.org/10.2478/s11756-018-0138-y.

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47

Gasparini, Stéphane, Jacques Castel, and Xabier Irigoien. "Impact of suspended particulate matter on egg production of the estuarine copepod, Eurytemora affinis." Journal of Marine Systems 22, no. 2-3 (October 1999): 195–205. http://dx.doi.org/10.1016/s0924-7963(99)00041-x.

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48

Ban, Syuhei, and Takashi Minoda. "Hatching of Diapause Eggs of Eurytemora Affinis (Copepoda: Calanoida) Collected from Lake-Bottom Sediments." Journal of Crustacean Biology 12, no. 1 (January 1, 1992): 51–56. http://dx.doi.org/10.2307/1548718.

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49

Hough, AR, and E. Naylor. "Field studies on retention of the planktonic copepod Eurytemora affinis in a mixed estuary." Marine Ecology Progress Series 76 (1991): 115–22. http://dx.doi.org/10.3354/meps076115.

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50

Tackx, M. L. M., P. J. M. Herman, S. Gasparini, X. Irigoien, R. Billiones, and M. H. Daro. "Selective feeding of Eurytemora affinis (Copepoda, Calanoida) in temperate estuaries: model and field observations." Estuarine, Coastal and Shelf Science 56, no. 2 (February 2003): 305–11. http://dx.doi.org/10.1016/s0272-7714(02)00182-8.

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