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ICES Journal of Marine Science: Journal du Conseil 2005 62(7):1281-1292; doi:10.1016/j.icesjms.2005.05.020
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© 2005 International Council for the Exploration of the Sea

The relationship between plankton, capelin, and cod under different temperature conditions

E.L. Orlova*, V.D. Boitsov, A.V. Dolgov, G.B. Rudneva and V.N. Nesterova

Polar Research Institute of Marine Fisheries and Oceanography (PINRO) 6 Knipovich Street, 183763 Murmansk, Russia

*Correspondence to E. L. Orlova: tel: +7 8152 473424; fax: +7 1 78910518. e-mail: orlova{at}pinro.ru.

On the basis of data from cold (1982 and 1987) and warm summers (1983, 1984, 1990, and 1992), we explore the relationship between the phytoplankton bloom and the timing and intensity of the zooplankton bloom. In warm years, there is more overlap in the time between the zooplankton and the phytoplankton bloom. In northern areas (76–78°N) with seasonal ice, the phytoplankton bloom and reproductive processes in Calanus finmarchicus and Calanus glacialis continue well into August, evidenced by the presence of an abundance of nauplii and younger copepodites. We analyse feeding intensity of capelin and its distribution relative to food availability and capelin abundance. The extent to which feeding areas of cod and capelin, its major prey, overlap is subject to the abundance of these species, distribution of zooplankton, and sea temperature in a given year.

Keywords: Barents Sea, capelin, cod, copepods, zooplankton

Received 1 July 2004; accepted 28 May 2005.


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