Dynamics of herbivores and resources on a landscape with interspersed resources and refuges

Rongsong Liu, Donald L. DeAngelis, John P. Bryant

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

A tradeoff between energy gain from foraging and safety from predation in refuges is a common situation for many herbivores that are vulnerable to predation while foraging. This tradeoff affects the population dynamics of the plant-herbivore-predator interaction. A new functional response is derived based on the Holling type 2 functional response and the assumption that the herbivore can forage at a rate that maximizes its fitness. The predation rate on the herbivore is assumed to be proportional to the product of the time that the herbivore spends foraging and a risk factor that reflects the habitat complexity; where greater complexity means greater interspersion of high food quality habitat and refuge habitat, which increases the amount of the edge zone between refuge and foraging areas, making foraging safer. The snowshoe hare is chosen as an example to demonstrate the resulting dynamics of an herbivore that has been intensely studied and that undergoes well-known cycling. Two models are studied in which the optimal foraging by hares is assumed, a vegetation-hare-generalist predator model and a vegetation-hare-specialist predator model. In both cases, the results suggest that the cycling of the snowshoe hare population will be greatly moderated by optimal foraging in a habitat consisting of interspersed high quality foraging habitat and refuge habitat. However, there are also large differences in the dynamics produced by the two models as a function of predation pressure.

Original languageEnglish (US)
Pages (from-to)195-208
Number of pages14
JournalTheoretical Ecology
Volume7
Issue number2
DOIs
StatePublished - Jan 1 2014

Keywords

  • Herbivore-vegetation dynamics
  • Landscape complexity
  • Limit cycle oscillations
  • Optimal foraging
  • Predation refuges
  • Snowshoe hare

ASJC Scopus subject areas

  • Ecological Modeling
  • Ecology

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