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Studies on a Calanus Patch III. The quantity of food eaten by Calanus finmarchicus

Published online by Cambridge University Press:  11 May 2009

D. H. Cushing  and
T. Vucetic
D. H. Cushing
Affiliation:
Fisheries Laboratory, Lowestoft
T. Vucetic
Affiliation:
Institute for Fisheries Biology, Split, Yugoslavia
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Extract

The purpose of this paper is to assess the grazing capacity of Calanus finmar-chicus (Gunner.) in terms of the quantity of food eaten in the sea. The part played in the growth of the animal by the quantity eaten will only be briefly discussed. The parts played by nutrient lack, sinking and diffusion on the algal productive rates will also be discussed, leading to the conclusion that grazing mortality is the most effective controlling agent on algal production.

A subsidiary purpose of this paper is to relate changes in the weight of Calanus finmarchicus to changes in food consumed and to changes in water temperature. Measurements of C. finmarchicus have been made by a number of workers (Adler & Jespersen, 1920; Russell, 1928; Marshall, 1933; Stormer, 1929; Bogorov, 1934; Jespersen, 1939; Clarke & Zinn, 1937). It will be shown that in the North Sea, in spring, the greatest changes in weight are most readily related to changes in quantities of food consumed.

Type
Research Articles
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 43 , Issue 2 , July 1963 , pp. 349 - 371
Copyright
Copyright © Marine Biological Association of the United Kingdom 1963

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