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Journal of Plankton Research, Vol 21, 1009-1015, Copyright © 1999 by Oxford University Press

ORIGINAL ARTICLES

Short communication. Food availability and diel feeding rhythms in the marine copepods Acartia grani and Centropages typicus

A CalbetE Saiz, X Irigoien, M Alcaraz and I Trepat
Institut de Ciències del Mar, CSIC, Passeig Joan de Borbó s/n, 08039 Barcelona, Catalonia, Spain; Present address: Department of Oceanography, University of Hawaii at Manoa, 1000 Pope Road, Honolulu, HI 96822, USA

The effects of food availability on the daily feeding pattern of planktonic copepods was studied for two species: Acartia grani (cultured and wild specimens) and Centropages typicus (wild specimens). Both species showed clear diel feeding rhythms at high food concentrations, with significantly higher clearance rates during night hours. However, at limiting food conditions, while C.typicus maintained its daily feeding pattern, A.grani fed continuously, with similar day and night clearance rates. These results could be explained in relation to differences in predation risks and probability of experiencing starvation episodes in their respective habitats, as well as their capacity for dampening food fluctuations. On the other hand, the maintenance (although with less intensity) of the diel feeding rhythm in A.grani, when cultured in the laboratory for long periods of time (>10 generations) and in the absence of predators, suggests the importance of the endogenous control of copepod feeding patterns.
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