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Diel variations in the nutritional physiology of Calanus glacialis from Lat. 78°N in the summer

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Abstract

Calanus glacialis (Jaschnov) from Isfjord, western Spitzbergen, showed no tendency to pronounced diurnal vertical migration or cyclic variations in feeding activity. The samples, taken regularly over a 24-h period and at three different depths in the beginning of August, did however show considerable individual variations in feeding activity. These variations, reflected in the results of gut analyses, were not related to variations in the concentrations of particulate protein, carbohydrate or algal pigments in the water. Analyses of the activities of two digestive enzymes and the electron-transport system (ETS) indicated that those few individuals always present below the photic zone were there temporarily, and showed no signs of slowing down their metabolism. The results suggest that the population of C. glacialis, during the Arctic summer, feeds continuously in the upper water layer, but that intermittent, non-synchronous individual feeding rhythms are the rule.

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Authors and Affiliations

  1. Tjärnö Marine Biological Laboratory, University of Göteborg, P.O. Box 2781, S-452 00, Strömstad, Sweden

    U. Båmstedt

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  1. U. Båmstedt
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Communicated by O. Kinne, Hamburg

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Båmstedt, U. Diel variations in the nutritional physiology of Calanus glacialis from Lat. 78°N in the summer. Marine Biology 79, 257–267 (1984). https://doi.org/10.1007/BF00393257

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