Food web structure affects the extinction risk of species in ecological communities |
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Authors: | Tomas Jonsson Patrik KarlssonAnnie Jonsson |
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Institution: | Systems Biology Group, School of Life Sciences, University of Skövde, P.O. Box 408, SE-541 28 Skövde, Sweden |
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Abstract: | This paper studies the effect of food web structure on the extinction risk of species. We examine 793 different six-species food web structures with different number, position and strength of trophic links and expose them to stochasticity in a model with Lotka–Volterra predator–prey dynamics. The characteristics of species (intrinsic rates of increase as well as intraspecific density dependence) are held constant, but the interactions with other species and characteristics of the food web are varied. |
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Keywords: | Environmental stochasticity Food webs Extinction risk Interaction strength |
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