A Model for the Space–Time Dependence of Feeding for Pelagic Fish Populations
- 1 September 1993
- journal article
- Published by Oxford University Press (OUP) in Transactions of the American Fisheries Society
- Vol. 122 (5) , 884-901
- https://doi.org/10.1577/1548-8659(1993)122<0884:amftst>2.3.co;2
Abstract
The time-varying spatial distribution of pelagic fish is an important factor in the development of feeding rate estimates for input into bioenergetics growth models. Key issues are the degree to which fish and prey distributions overlap, the frequency and duration of such overlaps, and the effectiveness of foraging during overlaps. A model for the space and time dependences of feeding by the pelagic planktivorous alewife Alosa pseudoharengus in the Great Lakes is presented. The model combines two submodels: (1) a diffusion–taxis model of predator and prey dispersal and (2) a foraging rate model. Both models depend on environmental variables. The diffusion–taxis model is based on directional motion and random motion on the part of the fish. Directional motion is determined from a taxis function that relies on local cues for feeding rate and encounter rate with predators. The foraging model expresses the feeding rate of a predator as a function of predator and prey sizes, prey density, light level,...Keywords
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