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Distance-limited dispersal promotes coexistence at habitat boundaries: reconsidering the competitive exclusion principle
Authors:Débarre Florence  Lenormand Thomas
Institution:Centre d'écologie Fonctionnelle et évolutive, CNRS - UMR 5175, 1919 Route de Mende, F-34293 Montpellier Cedex 5, France.
Abstract:Understanding the conditions for the stable coexistence of different alleles or species is a central topic in theoretical evolution and ecology. Different causes for stable polymorphism or species coexistence have already been identified but they can be grouped into a limited number of general processes. This article is devoted to the presentation and illustration of a new process, which we call 'habitat boundary polymorphism', and which relies on two key ingredients: habitat heterogeneity and distance-limited dispersal. Under direct competition and with fixed population densities, we show that this process allows for the equilibrium coexistence of more than n types in a n-habitat environment. Distance-limited dispersal indeed creates local maladaptation at habitat edges, which leaves room for the invasion of more generalist alleles or species. This mechanism provides a generic yet neglected process for the maintenance of polymorphism or species coexistence.
Keywords:Allele polymorphism  cline  exclusion rule  generalist  habitat  habitat fragmentation  intermediate heterogeneity hypothesis  landscape complementation  spatial heterogeneity  specialist  species diversity
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