Tidal and annual variability of the population structure of Eurytemora affinis in the middle part of the Seine Estuary during 2005

Devreker, David; Souissi, Sami; Molinero, Juan Carlos; Beyrend-Dur, Delphine; Gómez, Fernando; Forget-Leray, Joëlle

doi:10.1016/j.ecss.2010.07.010

Cited by 53 publications

(26 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In laboratory as well as field conditions, the density of E. affinis drops during summer temperature (∼20°C) compared to the optimal spring temperature of 15°C (Devreker et al 2010). In parallel, a very low fecundity of females, coupled with a decrease of potential for recruitment were observed within the Seine Estuary population during a long negative anomaly of late winter temperature observed during 2005 when the lowest values of temperatures dropped to 5°C (Devreker et al 2010). That tends to show that the low inductions of hsp genes recorded during our experiment (at 7.5°C and 22.5°C) transcribe a thermic stress sufficient to affect life history traits.…”

Section: Discussionmentioning

confidence: 99%

Molecular characterization and mRNA expression of grp78 and hsp90A in the estuarine copepod Eurytemora affinis

Xuereb

Forget-Leray

Souissi

et al. 2012

Cell Stress and Chaperones

Self Cite

View full text Add to dashboard Cite

The present study aimed to develop a method of quantification of heat shock protein transcript levels in the estuarine copepod Eurytemora affinis. For that, the fulllength cDNA of the 78-kDa glucose-regulated protein (Eagrp78) and the cytosolic 90-kDa heat shock protein (Eahsp90A) from this species have been cloned. These cDNA revealed, respectively, 2,370 and 2,299 bp with 1,971 and 2,124 bp open reading frames encoding 656 and 707 amino acids. Main features, sequence identities and phylogenetic analysis with other species were described. Then, the expression profiles were analysed using reverse transcription/ real-time quantitative PCR method from copepods subjected to different thermic and osmotic stresses in laboratory, and from copepods directly sampled into the natural population of the Seine Estuary (France) along a salinity gradient. Thermic shock (7.5°C, 22.5°C and 30°C during 90 min) significantly induced increases of transcript quantities ranged between 1.7-and 19.7-fold the levels observed in control conditions (15°C). Hypo-and hyper-osmotic shocks (salinities of 1 and 30 during 90 min) caused a 2-fold induction of Ea-hsp90A transcript level in comparison to controls (salinity of 15) whereas no significant change was measured for Ea-grp78. On the other hand, similar expression profiles were observed for the two transcripts after 72 h of exposition to salinities of 1 and 25 with a significant 2-fold induction observed for the lower salinity. To finish, strong expression inductions of both Ea-grp78 and Eahsp90A genes were observed in field copepods sampled at low salinity during the campaigns of June 2009 and May 2010. These results tend to show that the low salinity and the increase of temperature seem to have a synergic effect on stress condition of copepods.

show abstract

Section: Discussionmentioning

confidence: 99%

Molecular characterization and mRNA expression of grp78 and hsp90A in the estuarine copepod Eurytemora affinis

Xuereb

Forget-Leray

Souissi

et al. 2012

Cell Stress and Chaperones

Self Cite

View full text Add to dashboard Cite

show abstract

“…Ovigerous females and nauplii were found in the Seine estuary during a severe winter (5°C in 2005; Devreker et al 2010), indicating that even under low temperatures, this species is able to have successful reproduction.…”

Section: Discussionmentioning

confidence: 99%

Effects of photoperiod on egg production inEurytemora affinisPoppe, 1880 (Copepoda: Calanoida) from the Seine Estuary (France)

Glippa

Alekseev

Souissi

2013

Italian Journal of Zoology

Self Cite

View full text Add to dashboard Cite

The calanoid copepod Eurytemora affinis Poppe, 1880 is the most abundant species of the mesozooplanktonic community of the Seine estuary (France) in the lower salinity zone. Diapausing eggs of this species have been found in the sediment of this estuary but they are few in comparison with those found for other calanoid species. We thus decided to test the effect of photoperiod on diapausing egg production in E. affinis from the Seine estuary. For this, an experimental device has been developed. A combination of five photoperiods and two temperatures was used and the production of eggs was studied for the first and the second clutch. The production of diapausing eggs was demonstrated under photoperiodic conditions less than or equal to 12 h of light either at 12 or 16°C with a maximum under constant darkness (6%). A significant increase in the number of non-viable eggs was also observed between the first and the second clutch for all tested conditions and this may be due to the non-fertilization of these eggs. We also verified that the late naupliar instars are sensitive to the photoperiodic signal.The experimental approach has revealed that the production of diapausing eggs in the key species to the downstream Seine estuary, E. affinis, could be induced by short days, but photoperiod was probably not the only factor responsible for the induction of diapausing egg production. The percentage of diapausing eggs obtained under the induction experiment is similar to that obtained from the eggs extracted from the sediment of the Seine estuary (7%). The strategy of E. affinis in this estuary would be to constitute an egg bank, acting as long-term survival or in the case of adverse conditions. The role of geographical position (mainly latitude) and local conditions in the reproductive strategy of E. affinis is discussed.

show abstract

“…Most studies on small-scale variability of copepods were conducted mainly in temperate estuaries (e.g. Devreker et al, 2010;Ueda et al, 2010;Goncalves et al, 2012) and only a few in tropical estuaries (e.g. Krumme and Liang, 2004;Magalhães et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Vertical migration and positioning behavior of copepods in a mangrove estuary: Interactions between tidal, diel light and lunar cycles

Chew

Chong

Ooi

et al. 2015

Estuarine, Coastal and Shelf Science

View full text Add to dashboard Cite

Tidal and annual variability of the population structure of Eurytemora affinis in the middle part of the Seine Estuary during 2005

Cited by 53 publications

References 50 publications

Molecular characterization and mRNA expression of grp78 and hsp90A in the estuarine copepod Eurytemora affinis

Molecular characterization and mRNA expression of grp78 and hsp90A in the estuarine copepod Eurytemora affinis

Effects of photoperiod on egg production inEurytemora affinisPoppe, 1880 (Copepoda: Calanoida) from the Seine Estuary (France)

Vertical migration and positioning behavior of copepods in a mangrove estuary: Interactions between tidal, diel light and lunar cycles

Contact Info

Product

Resources

About