Functional response and capture timing in an individual-based model: predation by northern squawfish (Ptychocheilus oregonensis) on juvenile salmonids in the Columbia River

J. H. Petersen, D. L. Deangelis

Research output: Chapter in Book/Report/Conference proceedingChapter

34 Scopus citations

Abstract

Prey density, predator weight, prey weight, temperature, and diel feeding pattern were first incorporated into predation equations analogous to Holling Type 2 and Type 3 functional response models. Type 2 and Type 3 equations fit field data from the Columbia River equally well, and both models predicted predation rates on five of seven independent dates. Using the Type 2 functional response, random versus contagious timing of prey capture was tested using two related models. In the simpler model, salmon captures were assumed to be controlled by a Poisson renewal process; in the second model, several salmon captures were assumed to occur during brief "feeding bouts', modeled with a compound Poisson process. Salmon captures by individual northern squawfish were clustered through time, rather than random. The contagious-feeding result suggests that salmonids may be encountered as patches or schools in the river. -from Authors

Original languageEnglish
Title of host publicationCanadian Journal of Fisheries and Aquatic Sciences
Pages2551-2565
Number of pages15
Volume49
Edition12
StatePublished - Dec 1 1992

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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