Sunfish foraging among patches: the patch-departure decision

Dennis R. Devries, Roy A. Stein, Peter L. Chesson

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

Patch-use behaviour of small bluegill sunfish, Lepomis macrochirus, foraging for chironomid larvae, Chironomus riparius, was investigated in artificial macrophyte patches to examine search pattern within a patch and to determine the decision rule used by fish when leaving a patch. Fish were exposed to a sequence of habitats which differed in quality (i.e. total prey density); however, within a habitat all patches were of equal quality. When foraging in a single patch, fish encountered prey randomly, as evidenced by agreement between the distribution of intercapture intervals and the exponential distribution. Agreement between fish behaviour and predictions of a rate decision rule indicated that the decision to leave a patch was based on some estimate of capture rate in the patch. Predictions of how long fish should stay in a patch and how many prey they should capture during a patch visit were generated, using a giving-up time model based on an exponential distribution of intercapture intervals. Fish generally stayed longer and captured more prey than predicted by the model, using giving-up times that were longer than optimal. The relationship between rate of prey capture for the habitat and giving-up times was shaped such that fish minimized the cost, in terms of a decrease in capture rate, by overestimating rather than underestimating the optimal giving-up time.

Original languageEnglish (US)
Pages (from-to)455-464
Number of pages10
JournalAnimal Behaviour
Volume37
Issue numberPART 3
DOIs
StatePublished - Mar 1989
Externally publishedYes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

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