Journal of Plankton Research, Vol 21, 1249-1264, Copyright © 1999 by Oxford University Press
S Falk-Petersen, G Pedersen, S Kwasniewski, E Hegseth and H Hop
The marginal ice zone (MIZ) in the northern Barents Sea is ecologically
important because it represents a highly productive area in Arctic water
masses north of the Polar Front. During a multi-disciplinary cruise in
1995, ecological and oceanographic processes were investigated at four
stations located in a north-south transect in the MIZ. This study was
carried out in Arctic water masses north of the Polar Front where ice
conditions varied from dense first-year pack ice to open water. Also, the
phytoplankton development varied along the transect from a pre-bloom
situation at the northern-most station to a post-bloom situation in the
open water. This paper includes a study of the zooplankton community and
population structure of some of the dominant copepod species. Numerically,
the most important mesozooplankton components were the copepods
Calanus glacialis, Pseudocalanus minutus and
Oithona similis. Copepods of Atlantic origin, such as
Calanus finmarchicus and Oithona
atlantica, gave evidence of an advection of Atlantic water
masses into the area. It is concluded that the occurrence of new cohorts of
Arctic copepods coincides with the onset of the phytoplankton bloom in the
MIZ, and, that therefore, the spawning relies on stored energy.
ORIGINAL ARTICLES
Spatial distribution and life-cycle timing of zooplankton in the marginal ice zone of the Barents Sea during the summer melt season in 1995
Norwegian Polar Institute, N-9296 Tromsø, Norway; Institute of Oceanology, Polish Academy of Sciences, Powstancow Warszawy St 55, 81-712 Sopot, Poland; Norwegian College of Fishery Science, University of Tromsø, N-9037 Tromsø, Norway
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