Variability of mortality rates for Calanus finmarchicus early life stages in the Labrador Sea and the significance of egg viability

Mortality rates of eggs and nauplii are essential for understanding and modelling dynamics of copepod populations. Abundances of Calanus finmarchicus females, eggs and nauplii were determined at 88 stations in the Labrador Sea. Egg production rates (EPRs) and egg and naupliar stage durations were ca...

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Bibliographic Details
Published in:Journal of plankton research 2015-11, Vol.37 (6), p.fbv080-1165
Main Authors: Head, Erica J. H., Gentleman, Wendy C., Ringuette, Marc
Format: Article
Language:English
Subjects:
Calanus finmarchicus
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Summary:Mortality rates of eggs and nauplii are essential for understanding and modelling dynamics of copepod populations. Abundances of Calanus finmarchicus females, eggs and nauplii were determined at 88 stations in the Labrador Sea. Egg production rates (EPRs) and egg and naupliar stage durations were calculated using published relationships with in situ chlorophyll concentration and temperature. The data were used to estimate mortality rates for eggs (M sub(E)), eggs and early naupliar stages (M sub(E-NIII)) and naupliar stages (M sub(NI-NVI)). Estimated mortality rates in the central basin were higher than those on the shelves and within regions generally M sub(E) > M sub(E-NIII) > M sub(NI-NVI.) The "Basic Method" for eggs, arguably the most reliable method, gave a high proportion of seemingly erroneous (negative) values. These became positive when a modified estimation formula was used, which assumes that some eggs being laid could not hatch. Egg hatching success is often
ISSN:0142-7873
1464-3774
DOI:10.1093/plankt/fbv080