Overwinter transport of the zooplankton Calanus finmarchicus in the Norwegian Sea
Henrik Soiland, Geir Huse
Institute of Marine Research
(Abstract received 08/14/2009 for session E)
ABSTRACT
The Norwegian Sea is one of the core areas of the zooplankton Calanus finmarchicus, and harbours high abundances in the upper waters during summer. The C. finmarchicus is vital to many of the planktivorous fish species which feed in the Norwegian Sea during summer. C. finmarchicus spends the period from late summer until January-February resting in diapauses, mainly at depths between 500-1500 m. We use drift trajectories from 26 RAFOS floats to describe and discuss overwinter transportation of C. finmarchicus in the Norwegian Sea. The RAFOS floats were deployed in the fall of 2004 and surfaced in March 2006, thus spending two winters in the Norwegian Sea. The RAFOS floats drifted at 800m and we use the winter trajectories to mimic the winter drift of the C. finmarchicus. These data allowed us to investigate in more detail specific questions about the overwintering transport of C. finmarchicus.
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