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JOURNAL OF PLANKTON RESEARCH | VOLUME 6 | NUMBER 5 | PAGES 843-857 | 1984
© Oxford University Press

research-article

Local variations in size and activity among Calanus finmarchicus and Metridia longa (Copepoda, Calanoida) overwintering on the west coast of Norway

U. Båmstedt1 and A. Ervik2

1Tjärnö Marine Biological Laboratory, University of Göteborg P.O. Box 2781, S-452 00 StrOmstad, Sweden 2Institute of Marine Biology, University of Bergen N-5065 Blomsterdalen, Norway

Received on November 1, 1983; accepted on May 1, 1984 Vertical net hauls were taken at thirteen stations between latitude 60°08'N – 61°20'N and longitude 03°04'E – 07°00'E in late November 1980. Size and activity characteristics of Calanus finmarchicus and Metridia longa were studied. Significant differences were noted between C. finmarchicus from different stations. Average body length, dry weight, protein and lipid contents, gonad development, and ainylase and trypsin activities varied but average gut fullness and trypsin/amylase ratio appeared constant. M. longa from different stations showed significant differences in average body length, dry weight, protein content, amylase and trypsin activities and gut fullness, but there were no apparent variations in lipid content and trypsin/ainylase ratio. Those animals inhabiting the most seaward station tended to show the most specific local charactenstics. M. longa had consistently lower lipid proportion with higher gut fullness and digestive-enzyme activities than C. finmarchicus. The results therefore indicate that C. finmarchicus had assumed a winter state of low activity with dependence on stored energy, while M. longo relied more upon utilization of available food.


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