Egg production and hatching success in the calanoid copepods Calanus helgolandicus and Calanus finmarchicus in the North Sea from March to September 2001 |
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| Authors: | Jonasdottir Sigrun H; Trung Nguyen Huu; Hansen Frank; Gartner Sanne |
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| Institution: | 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 |
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| Abstract: | Spatial and seasonal egg production rates (Er) and egg hatchingsuccess in the copepods Calanus finmarchicus and Calanus helgolandicuswere measured in the North Sea from March to September. Foodavailability was monitored by chlorophyll and protist concentrationsand three size fractions of seston fatty acids. Seasonal andspatial 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 abundancepeaks, in spring and autumn, with a low in May during whichtime the highest Er were observed (38 eggs female–1 day–1).At other times, Er in C. helgolandicus remained lower than inC. finmarchicus ( |
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