1. Egg production of Calanus finmarchicus—A basin-scale study
- Author
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Cecilie Broms, Astthor Gislason, Erling Kaare Stenevik, Eilif Gaard, Bjørnar Ellertsen, Webjørn Melle, and Irina Prokopchuk
- Subjects
congenital, hereditary, and neonatal diseases and abnormalities ,education.field_of_study ,Chlorophyll a ,biology ,Calanus finmarchicus ,education ,fungi ,Population ,nutritional and metabolic diseases ,Norwegian ,Oceanography ,biology.organism_classification ,language.human_language ,chemistry.chemical_compound ,Nitrate ,chemistry ,embryonic structures ,language ,Bloom ,Basin scale - 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.
- Published
- 2007
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