Egg production of Calanus finmarchicus—A basin-scale study |
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| Authors: | Erling K Stenevik Webjrn Melle Eilif Gaard Astthor Gislason Cecilie T Broms Irina Prokopchuk Bjrnar Ellertsen |
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| Institution: | aInstitute of Marine Research, P.O. Box 1870 Nordnes, N-5817 Bergen, Norway;bFaroese Fisheries Laboratory, P.O. Box 3051, FO-160 Torshavn, Faroe Islands;cMarine Research Institute, Skulagata 4, 121 Reykjavik, Iceland;dKnipovich Polar Research Institute of Marine Fisheries and Oceanography, (PINRO), 6 Knipovich Street, Murmansk, Russia |
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| Abstract: | Egg production of Calanus finmarchicus was studied during joint basin-scale surveys in April–June 2003 in the Norwegian Sea. Surveys covered the whole Norwegian Sea and were conducted from Norwegian, Icelandic and Faroese research vessels. Stations were classified as being in pre-bloom, bloom or post-bloom phase according to levels of chlorophyll a and nitrate. Individual egg production rates and population egg production rates were calculated and compared between areas. Both individual egg production rates (eggs female−1 day−1) and population egg production rates (eggs m−2 day−1) were significantly higher in bloom areas compared with pre-bloom and post-bloom areas. However, when integrated over an estimated duration of the three phases, the time-integrated egg production (eggs m−2) in most years was highest in the pre-bloom phase, and this was explained by the longer duration of this phase compared with the two other phases. |
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| Keywords: | Calanus finmarchicus Egg production Norwegian Sea Gut fluorescence Spring bloom |
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