Life cycle traits of two transatlantic populations of Eurytemora affinis (Copepoda: Calanoida): salinity effects

Beyrend-Dur, Delphine; Souissi, Sami; Devreker, David; Winkler, Gesche; Hwang, Jiang‐Shiou

doi:10.1093/plankt/fbp020

Cited by 48 publications

(27 citation statements)

References 49 publications

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“…The clutch size in this species reaches 75 eggs clutch −1 (Beyrend-Dur et al 2009), which explains the stronger (compared to our data) difference between sinking speeds of nonovigerous and brooding females. Hence, the cost of the egg-brooding strategy in comparison with the broadcast strategy is likely to be increased due to energy demands for sustained locomotion and increased predation on adult females, since the large egg masses can cause a decrease in swimming speed (Seuront 2006).…”

Section: Effects Of Salinity On Egg Mass Densitycontrasting

confidence: 49%

Calanipeda aquaedulcis and Arctodiaptomus salinus are exceptionally euryhaline osmoconformers: evidence from mortality, oxygen consumption, and mass density patterns

Svetlichny¹,

Hubareva²,

Khanaychenko³

2012

Mar. Ecol. Prog. Ser.

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Mortality, respiration rate, and body mass density of the estuarine copepods Calanipeda aquaedulcis and Arctodiaptomus salinus and their eggs were studied over a wide range of salinities. Empirical hydrodynamic modeling was applied to calculate body mass density using the sinking speed of the copepods. According to the index of median lethal salinity (LS 50 ), the salinity tolerance ranges of C. aquaedulcis and A. salinus reared at 18 psu were 0.1 to 50 and 0.1 to 35 psu, respectively. No significant effect of salinity on the specific oxygen consumption rate was found in the range from 0.1 to 40 psu in both species, while mean body mass density increased iso-osmotically with water salinity from (mean ± SD) 1.053 ± 0.007 to 1.077 ± 0.005 g cm −3 in C. aquaedulcis and from 1.039 ± 0.004 to 1.062 ± 0.007 g cm −3 in A. salinus. However, body density contrast and sinking speed were stable in both species, allowing them to avoid buoyancy problems with changing salinity. The mean mass density of resting eggs in A. salinus gradually increased isoosmotically following gradual changes in salinity. In contrast to resting eggs, the mass density of subitaneous eggs was not altered by changes in the surrounding salinity, suggesting a hysteresis response in these eggs.

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Section: Effects Of Salinity On Egg Mass Densitycontrasting

confidence: 49%

Calanipeda aquaedulcis and Arctodiaptomus salinus are exceptionally euryhaline osmoconformers: evidence from mortality, oxygen consumption, and mass density patterns

Svetlichny¹,

Hubareva²,

Khanaychenko³

2012

Mar. Ecol. Prog. Ser.

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“…Furthermore, differences in host susceptibility (Glover et al 2003, Glover & Skaala 2006) may also influence groups of lice. Studies conducted on other marine copepods have revealed significant genetic variation among populations despite a high potential for dispersal (Bucklin et al 2000, Oines & Heuch 2007, Nuwer et al 2008, and population-specific adaptations to salinity have been documented (Beyrend-Dur et al 2009). Additionally, some copepod studies have revealed cryptic species as opposed to populations (Lee 2000, Chen & Hare 2008, as evidenced by reproductive incompatibility (Lee 2000).…”

Section: Discussionmentioning

confidence: 99%

Population genetic structure of the parasitic copepod Lepeophtheirus salmonis throughout the Atlantic

Glover

Stølen²,

Messmer³

et al. 2011

Mar. Ecol. Prog. Ser.

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The parasitic copepod Lepeophtheirus salmonis is responsible for huge economic losses in the salmonid aquaculture industry, and has been linked with declines of wild salmonid populations. In order to elucidate population genetic structure throughout the Atlantic Ocean, 2495 lice representing 27 samples collected from 22 locations were analysed for 14 microsatellite loci. Significant overall genetic variation was observed (14 loci: global F ST = 0.0057, p < 0.0001), although this decreased slightly when an outlier locus (LsalSTA3), detected as a candidate for positive selection, was removed (13 neutral loci: global F ST = 0.0022, p < 0.0001). A relationship between physical and genetic distance was observed (R 2 = 0.179, p = 0.0013), but only when data from LsalSTA3 was included. No overall genetic variation was observed among the 19 samples collected in Norway (Norwegian global F ST < 0.0001, p = 0.6). None of the within-country (Canada, Ireland, Shetland and Faroe Islands) pairwise F ST values were statistically significant when analysing the 13 neutral loci and following Bonferroni correction. Samples taken at 5 Norwegian farms did not exhibit significant genetic differences before and after medicated treatment. We conclude that L. salmonis displays weak but nevertheless statistically significant population genetic variation throughout the Atlantic. Analysis of temporal samples, potentially combined with larger numbers of markers giving greater genome coverage, will be required to fully elucidate the biological significance of the observed variation.

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“…Some studies of marine copepods have shown that copepods were always limited by food in the field (Checkley, 1980;Durbin et al, 1983) and egg production was immediately limited by phytoplankton availability (Checkley, 1980). Many studies have focused on the effect of single environmental factors, such as temperature, food or salinity, on estuarine copepods (Vuorinen et al, 1998;Cervetto, Gaudy & Pagano, 1999;Ishikawa, Ban & Shiga, 1999;Lee & Petersen, 2002;Beyrend-Dur et al, 2009), or even on the combined effect of temperature and salinity (Roddie, Leakey & Berry, 1984;Chinnery & Williams, 2004;Devreker, Souissi & Seuront, 2004;Holste & Peck, 2005;Devreker et al, 2007Devreker et al, , 2009Beyrend-Dur et al, 2011). Although previous studies have shown that growth and egg production of some copepod species were more sensitive to food shortage than to temperature variation (Ban, 1994;Koski & Kuosa, 1999), few studies have dealt with the combined effect of these environmental factors on copepod development, growth and reproduction (Klein Breteler & Gonzalez, 1986;Koski & Kuosa, 1999;Cook et al, 2007;Jim enez-Melero et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Combined effects of temperature and food concentration on growth and reproduction of Eodiaptomus japonicus (Copepoda: Calanoida) from Lake Biwa (Japan)

et al. 2015

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Summary Life history traits of the freshwater calanoid copepod Eodiaptomus japonicus from Lake Biwa were examined in the laboratory. Four different food concentrations (FC, 103, 5 × 103, 104 and 5 × 104 cells mL−1) and two temperature conditions (15 and 25 °C) were used to clarify the combined effects of those two factors on life history traits. A survival rate of more than 70% was observed at the two medium FCs at 15 °C, although survival was <42% at all six of the other food–temperature combinations. Post‐embryonic development times to adult stage in males and females were affected by both FC and temperature; median development times ranged from 28.7 to 37.3 and 31.4 to 35.0 days at 15 °C and 13.7 to 23.9 and 14.3 to 27.7 days at 25 °C, respectively, for males and females. An interaction between the two experimental factors was found only for females, with food shortage being most acute at 25 °C. Clutch sizes also increased with FC at both temperatures and interaction occurred between those two factors. Egg production rates increased with increasing FC similarly at both temperatures without an interaction effect. Adult body size increased with increasing FC at both temperatures: for example, average female prosome length increased from 0.865 mm to 0.922 mm at 15 °C and from 0.799 mm to 0.904 mm at 25 °C. Somatic and population growth rates calculated from the experimental data increased with FC, but the increase was more important at 25 °C. These responses to FC and temperature suggest that both growth and population dynamics of this copepod might be more influenced by food shortage at temperatures >15 °C. Adult body sizes under food‐limited conditions in this study are at the lower end of the range of those observed in situ, while those predicted from in situ temperatures, assuming non‐limiting food conditions, were always larger than those of natural populations. Therefore, food shortage appears to be the most important factor affecting both growth and reproduction of E. japonicus in Lake Biwa.

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Life cycle traits of two transatlantic populations of Eurytemora affinis (Copepoda: Calanoida): salinity effects

Cited by 48 publications

References 49 publications

Calanipeda aquaedulcis and Arctodiaptomus salinus are exceptionally euryhaline osmoconformers: evidence from mortality, oxygen consumption, and mass density patterns

Calanipeda aquaedulcis and Arctodiaptomus salinus are exceptionally euryhaline osmoconformers: evidence from mortality, oxygen consumption, and mass density patterns

Population genetic structure of the parasitic copepod Lepeophtheirus salmonis throughout the Atlantic

Combined effects of temperature and food concentration on growth and reproduction of Eodiaptomus japonicus (Copepoda: Calanoida) from Lake Biwa (Japan)

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