title: Foraging in a patchy environment by a predatory net-spinning caddis larva: A test of optimal foraging theory.
abstract: The predatory larvae of the caddis Plectrocnemia conspersa (Curtis) cause significant prey depletion in a habitat in which prey are patchily distributed. Optimal foraging theory predicts that under these circumstances a predator should stay in any given patch until the prey capture rate there drops to a value equal to the average for the habitat as a whole. This was tested using a combination of field and laboratory data and the results were in broad agreement with the prediction. A second prediction is that the marginal capture rate should be higher in a habitat richer in prey and this was not supported. It is argued that by using a simple rule-of-thumb (constant giving-up-time) P. conspersa is able to approach the optimal solution for much of the time.
authors.affiliation: School of Biological Sciences, University of East Anglia, NR4 7TJ, Norwich, UK.
authors.forename: Colin R
authors.initials: CR
authors.lastname: Townsend
authors.affiliation: Department of Zoology and Comparative Physiology, Queen Mary College, Mile End Road, E1 4NS, London, UK.
authors.forename: Alan G
authors.initials: AG
authors.lastname: Hildrew