What is the role of predation on stability of natural communities? A theoretical investigation.
A basic question in ecology concerns the role of species interaction on dynamics of natural communities. In this framework, ecologists have considered predation, competition, mutualism, the three most important interactions, highlighting their specific effects on distribution and abundance of species, providing knowledge about phenomena like coexistence and extinction. This paper seeks to identify the effects of predation on stability of natural communities by mathematical models. Simple multispecies community models, organized in trophic levels, are analyzed by means of a qualitative technique, loop analysis, combined with a computer calculation procedure. Results do not support the hypothesis of predation as a stabilizing factor. Rather, the outcomes of the analysis suggest that predation may or may not stabilize a community. This depends on the predator's behaviour and on the network of the community.
Bodini
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Institute of Ecology, University of Parma, Viale delle Scienze, Italy.
D000818:Animals; D003198:Computer Simulation; D004463:Ecology; D005246:Feedback; D008954:Models, Biological; D011235:Predatory Behavior