JPR Advance Access published online on November 22, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi091
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1 Danish Institute for Fisheries Research, Department of Marine Ecology and Aquaculture, Kavalergaarden 6, DK 2920 Charlottenlund, Denmark.
* To whom correspondence should be addressed. Spatial and seasonal egg production rates (Er) and egg hatching success in the copepods Calanus finmarchicus and C. helgolandicus were measured in the North Sea from March to September. Food availability was monitored by chlorophyll and protist concentrations and 3 size fractions of seston fatty acids. Seasonal and spatial distribution and production differed between the species. C. finmarchicus was found only offshore of the 50 m isobath, with decreasing Er (37 to 28 eggs female-1 day-1) from March to July. C. helgolandicus had 2 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 (ca. 20 eggs female-1 day-1). Normalized egg production rates (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.
Received August 7, 2005
Accepted October 25, 2005
Article
Egg production and hatching success in the Calanoid copepods Calanus helgolandicus and Calanus finmarchicus in the North Sea from March to September 2001
Sigrún H. Jónasdóttir 1 *,
Nguyen Huu Trung 2,
Frank Hansen 3,
and
Sanna Gärtner 4
2 Århus University, Finlandsgade 8, DK 8000 Århus, Denmark; Research Institute of Marine Fisheries, 170 Lelai Street, Haiphong, Vietnam
3 Baltic Sea Research Institute Warnemünde, Seestrasse 15, D-18119 Rostock, Germany
4 Danish Institute for Fisheries Research, Department of Marine Ecology and Aquaculture, Kavalergaarden 6, DK 2920 Charlottenlund, Denmark
Sigrún H. Jónasdóttir, E-mail: sjo{at}dfu.min.dk
Abstract
Communicating Editor: IR Jenkinson
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