Assessing stable isotope dynamics of diapausing Calanus finmarchicus and C. hyperboreus during the overwintering period: a laboratory experiment

Perrin, Geneviève; DiBacco, Claudio; Plourde, Stéphane; Winkler, Gesche

doi:10.1093/plankt/fbs042

Cited by 5 publications

(2 citation statements)

References 63 publications

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“…These lipid reserves are primarily composed of wax esters (WE), the proportion of which is normally in excess of 80% (Kjellerup et al, 2012). Lipids then act as the primary energy reserve for respiration during diapause (Ingvarsdóttir et al, 1999), with lipid sacs often taking up in excess of 60% of body volume (Perrin et al, 2012), but being continuously depleted as diapause proceeds.…”

Section: Vertical Population Structuring and Diel Vertical Migrationmentioning

confidence: 99%

On the surprising lack of differences between two congeneric calanoid copepod species, Calanus finmarchicus and C. helgolandicus

Wilson

Speirs

Heath

2015

Progress in Oceanography

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The important calanoid copepod species Calanus finmarchicus and C. helgolandicus have distinct geographic ranges which are changing under the influence of climate change. Understanding the mechanisms underlying their distributions is becoming increasingly important as a result of the possible ecological impacts of these range shifts. Here we review inter-species differences in key life cycle traits that influence each species’ geographic distribution, in particular development and growth, fecundity, feeding behaviour, vertical migration and overwintering behaviour. The distinct temperature niche of each species leads to an a priori assumption that the response of life cycle traits to temperature is a key determinant of their contrasting geographic distributions. A new development model was created to reconcile published experimental development times for each species. Model output indicates that at temperatures below approximately 12-13 ˚C, C. finmarchicus is the faster developing species, but above these temperatures C. helgolandicus develops more quickly. Conventionally Calanus development time is assumed to decrease monotonically with temperature; however our model indicates that the response of development time to temperature is instead U-shaped. Differences in life cycle aspects such as seasonality and vertical structuring are interpreted in light of this development model. Body size and lipid accumulation abilities could be significant influences on each species’ geographic distribution; however evidence is consistent with inter-species differences not existing for these traits. Published evidence shows that inter-species differences in egg production may exist, but do not follow a clear pattern. Diapause is an important and well studied life cycle adaptation of C. finmarchicus, but has received little attention in C. helgolandicus. We synthesised knowledge of diapause and suggest the hypothesis that C. helgolandicus is restricted to continental shelf regions as a result of an inability to diapause for significant periods. This synthesised view of each species’ respective life cycle traits is that response of growth and development to temperature is the only known difference between each species, which indicates a promising direction for the extension of population models of C. finmarchicus to C. helgolandicus

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Section: Vertical Population Structuring and Diel Vertical Migrationmentioning

confidence: 99%

On the surprising lack of differences between two congeneric calanoid copepod species, Calanus finmarchicus and C. helgolandicus

Wilson

Speirs

Heath

2015

Progress in Oceanography

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“…In copepods, the carbon to nitrogen ratio (C:N) increases with the amount of lipid stores. Maximum C:N can exceed 12 in late development stages, whereas in individuals without lipid stores C:N ratios are close to 4 (Koski, 1999;Evanson et al, 2000;Campbell et al, 2001;Forest et al, 2010;Perrin et al, 2012). Thus the proportion of structural body carbon at the onset of dormancy can be estimated as the ratio of the minimum to the maximum C:N values, here % 4/12 % 30%.…”

Section: Numerical Experimentsmentioning

confidence: 99%

A metabolic approach to dormancy in pelagic copepods helps explaining inter- and intra-specific variability in life-history strategies

Maps

Record

Pershing

2013

Journal of Plankton Research

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Dormancy (diapause) is a key life-history strategy of pelagic copepods that allows them to thrive in highly seasonal environments. Successful dormancy of copepodid stages requires the ability to store energy efficiently (for example as lipids) and to slow down the rate of mobilization of this capital during the dormant period. The physiology of lipids in copepods has been extensively reviewed; however, data about the energetics of dormancy are currently scattered throughout the literature. Thus, we conducted a meta-analysis comparing the metabolism of active and dormant copepods in 15 species that undergo dormancy as copepodids. Linear mixed-effects models showed that the metabolic rate of dormant copepods is about one-fourth of the values for actively growing copepods, a level that remains consistent across a large range of body size or environmental conditions. Based on these metabolic rates, we used a numerical modelling approach to predict dormancy duration as a function of body mass and ambient temperature, and to explain the observed range of body masses at the initiation of dormancy. Our numerical approach also provides explanations for inter-and intra-specific variability in life-history strategies, such as

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The effect of acidification and the combined effects of acidification/lipid extraction on carbon stable isotope ratios for sub-arctic and arctic marine zooplankton species

et al. 2014

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Assessing stable isotope dynamics of diapausing Calanus finmarchicus and C. hyperboreus during the overwintering period: a laboratory experiment

Cited by 5 publications

References 63 publications

On the surprising lack of differences between two congeneric calanoid copepod species, Calanus finmarchicus and C. helgolandicus

On the surprising lack of differences between two congeneric calanoid copepod species, Calanus finmarchicus and C. helgolandicus

A metabolic approach to dormancy in pelagic copepods helps explaining inter- and intra-specific variability in life-history strategies

The effect of acidification and the combined effects of acidification/lipid extraction on carbon stable isotope ratios for sub-arctic and arctic marine zooplankton species

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