JPR Advance Access originally published online on November 22, 2005
Journal of Plankton Research 2005 27(12):1239-1259; doi:10.1093/plankt/fbi091
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Egg production and hatching success in the calanoid copepods Calanus helgolandicus and Calanus finmarchicus in the North Sea from March to September 2001
1 Department of Marine Ecology and Aquaculture, Danish Institute for Fisheries Research, Kavalergaarden 6, DK 2920 Charlottenlund, Denmark, 2 Århus university, Finlandsgade 8, DK 8000 Århus, Denmark, 3 Research Institute of Marine Fisheries, 170 Lelai Street, Haiphong, Vietnam and 4 Baltic Sea Research Institute Warnemünde, Seestrasse 15, D-18119 Rostock, Germany
* Corresponding Author: sjo{at}dfu.min.dk
Received August 7, 2005; accepted in principle September 22, 2005; accepted for publication October 25, 2005; published online November 22, 2005
Communicating editor: I.R. Jenkinson
Spatial and seasonal egg production rates (Er) and egg hatching success in the copepods Calanus finmarchicus and Calanus helgolandicus were measured in the North Sea from March to September. Food availability was monitored by chlorophyll and protist concentrations and three size fractions of seston fatty acids. Seasonal and spatial distribution and production differed between the species. Calanus finmarchicus was found only offshore of the 50-m isobath, with decreasing Er (37–28 eggs female–1 day–1) from March to July. Calanus helgolandicus had two abundance peaks, in spring and autumn, with a low in May during which time the highest Er were observed (38 eggs female–1 day–1). At other times, Er in C. helgolandicus remained lower than in C. finmarchicus (
20 eggs female–1 day–1). Normalized Er (En) in both C. finmarchicus and C. helgolandicus were positively related to ciliate biomass while only negative relationships were found for all other variables measured. Hatching success in both Calanus species combined was significantly correlated with the essential fatty acid ratio 22:6n3/20:5n3.
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