Optimal foraging and ontogeny; food selection by Haplochromis piceatus |
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Authors: | F. Galis P. W. de Jong |
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Affiliation: | (1) Department of Organismal Zoology, Division of Ecological Morphology and Department of Population Biology, Division of Ecology, University of Leiden, P.O. Box 9516, 2300 RA Leiden, The Netherlands |
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Abstract: | Summary We examined the influence of satiation level, prey density and light intensity on food uptake rate through the ontogeny of Haplochromis piceatus. Prey handling in the buccal cavity was found to be the main factor limiting prey uptake rate under light circumstances and at a sufficiently high prey density. Food uptake rate per unit body weight of different sizes of H. piceatus was equal when feeding on Chaoborus but decreased with increasing fish size when feeding on Daphnia magna. In choice experiments with Chaoborus and D. magna, prey selection by H. piceatus of all sizes was according to the predictions based on Charnov's 1976 model. |
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Keywords: | Optimal foraging Prey selection Ontogeny Cichlids |
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