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

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

Content Provider	Springer Nature Link
Author	Liu, Rongsong DeAngelis, Donald L. Bryant, John P.
Copyright Year	2014
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.
Starting Page	195
Ending Page	208
Page Count	14
File Format	PDF
ISSN	18741738
Journal	Theoretical Ecology
Volume Number	7
Issue Number	2
e-ISSN	18741746
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-01-18
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Herbivore–vegetation dynamics Predation refuges Optimal foraging Snowshoe hare Limit cycle oscillations Landscape complexity Theoretical Ecology/Statistics Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Ecology Ecological Modeling

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