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Ecological investigations on the zoo plankton community of balsfjorden northern norway generation cycles and variations in body weight and body content of carbon and nitrogen related to over wintering and reproduction in the copepod calanus finmarchicus



Ecological investigations on the zoo plankton community of balsfjorden northern norway generation cycles and variations in body weight and body content of carbon and nitrogen related to over wintering and reproduction in the copepod calanus finmarchicus



Journal of Experimental Marine Biology & Ecology 62(2): 129-142



The generation cycles of C. finmarchicus (Gunnerus) are described together with the seasonal variations in length, wet weight, dry weight, C content, N content and C/N ratio in copepodite stage IV, V and stage VI males and females from Balsfjorden (69.degree.21'N:19.degree.06'E), a subarctic fjord in northern Norway. C. finmarchicus overwinters in copepodite stage IV (.apprxeq. 20%) or V (.apprxeq. 80%) and produces 1 generation/yr. Variations in body weight and body content of C and N in the different copepodite stages showed a pronounced seasonal pattern. For instance, the C/N ratio was lowest (4.9) in adult females during the spawning period. Copepodite stage IV and V had higher C/N values in summer and autumn (12-14) than in spring (8-10). Variations in length, weight and chemical composition revealed that the overwintering stock of C. finmarchicus went through 2 growth phases during this period. From Sept.-Jan. no significant changes in the measured variables were detected. During the 2nd phase of the overwintering period, Jan.-April, the different stages showed a profound decrease in weight and change in chemical composition. This seemed to be connected with the onset of sexual differentiation in stage V starting in Jan., subsequent molting into adults and gonad maturation in these adults. These results are further discussed in relation to the different prevailing hypotheses concerning overwintering strategy in Calanus sp.

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Accession: 005210299

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