Journal Article

Comparative ecology of over-wintering <i>Calanus finmarchicus</i> in the northern North Atlantic, and implications for life-cycle patterns

Michael R Heath, Peter R Boyle, Astthor Gislason, William S.C Gurney, Stephen J Hay, Erica J.H Head, Steven Holmes, Anna Ingvarsdóttir, Sigrun H Jónasdóttir, Pennie Lindeque, Raymond T Pollard, Jens Rasmussen, Kelvin Richards, Katherine Richardson, Gary Smerdon and Douglas Speirs

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 61, issue 4, pages 698-708
Published in print January 2004 | ISSN: 1054-3139
Published online January 2004 | e-ISSN: 1095-9289 | DOI:
Comparative ecology of over-wintering Calanus finmarchicus in the northern North Atlantic, and implications for life-cycle patterns

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  • Environmental Science
  • Marine and Estuarine Biology


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Data from plankton net and Optical Plankton Counter sampling during 12 winter cruises between 1994 and 2002 have been used to derive a multi-annual composite 3-D distribution of the abundance of over-wintering Calanus finmarchicus in a swath across the North Atlantic from Labrador to Norway. Dense concentrations occurred in the Labrador Sea, northern Irminger Basin, northern Iceland Basin, eastern Norwegian Sea, Faroe–Shetland Channel, and in the Norwegian Trench of the North Sea. A model of buoyancy regulation in C. finmarchicus was used to derive the lipid content implied by the in situ temperature and salinity at over-wintering depths, assuming neutral buoyancy. The Faroe–Shetland Channel and eastern Norwegian Sea emerged as having the highest water column-integrated abundances of copepodites, the lowest over-wintering temperature, and the highest implied lipid content. The results are discussed in the context of spatial persistence of populations, seasonal patterns of abundance, and relationships between over-wintering and lipid accumulation in the surface waters.

Keywords: Iceland Basin; Irminger Sea; Labrador Sea; lipid; net sampling; Norwegian Sea; Optical Plankton Counter; vertical distribution; zooplankton

Journal Article.  6395 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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