Journal
AMERICAN NATURALIST
Volume 155, Issue 4, Pages 485-496Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/303341
Keywords
metapopulation; evolutionarily stable strategy; dispersal; local extinction; population dynamics
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Earlier models on the evolution of dispersal have suggested that evolutionarily stable dispersal rates should increase with the frequency of local extinctions. Most metapopulation models assume site saturation (i.e., no local population dynamics), yet the majority of species distributed as metapopulations rarely attain carrying capacity in all occupied patches. In this article, we relax this assumption and examine the evolutionarily stable dispersal rate under nonsaturated but still competitive demographic conditions. Contrary to previous predictions, we show that increasing local extinction rates may allow decreasing dispersal rates to evolve.
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