Journal cover Journal topic
Web Ecology An open-access peer-reviewed journal
Journal topic
Volume 4, issue 1
Web Ecol., 4, 1–6, 2003
https://doi.org/10.5194/we-4-1-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.
Web Ecol., 4, 1–6, 2003
https://doi.org/10.5194/we-4-1-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.

  03 Sep 2003

03 Sep 2003

Analysis of adaptive foraging in an intraguild predation system

T. Okuyama*,1 and R. L. Ruyle2 T. Okuyama and R. L. Ruyle
  • 1School of Biological Sciences, Univ. of Nebraska-Lincoln, Lincoln, 68688-0118, USA
  • 2Dept. of Mathematics and Statistics, Univ. of Nebraska-Lincoln, Lincoln, 68588-0323, USA
  • *now at: Zoology Dept., Univ. of Florida, Gainesville, 32611-8525, USA

Abstract. An intraguild predation (IGP) system with adaptive foraging behavior was analyzed using a simple mathematical model. The main aim was to explore how the adaptive behavior affects species interactions as well as how such interactions derived from adaptive behavior affect community stability. The focal system contained top predators, intermediate predators, and basal prey. Intermediate predators exhibit antipredator behavior and balance costs (e.g. perceived predation risk) and benefits (e.g. resource intake) to determine their foraging effort. Density-dependent foraging behavior with the unique connectance of the IGP food web created unusual species interactions. Notably, increased prey density can transmit negative indirect effects to top predators while increased top predator density transmits positive indirect effects to prey population. The nature of these interactions is density-dependent. The results suggest that both IGP (as opposed to linear food chain) and adaptive foraging behaviors may strongly influence community dynamics due to emergent interactions among direct effects and indirect effects. Furthermore, the adaptive foraging of intermediate predators may stabilize the community as a whole.

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