Evol Ecol Res 8: 1377-1392 (2006)     Full PDF if your library subscribes.

Mixed dispersal strategies and response to disturbance

Jeffrey D. Achter1* and Colleen T. Webb2

1Department of Mathematics and  2Department of Biology, Colorado State University, Fort Collins, CO, USA

Author to whom all correspondence should be addressed.
e-mail: j.achter@colostate.edu

ABSTRACT

Question: How does selection mediated by a spatially spreading disturbance affect individual-level dispersal and population-level spatial structure?

Model features: We start with a birth–death process on a lattice and introduce a spatially spreading disturbance. We consider three different scenarios affecting whether an individual recovers from disturbance, corresponding to different trade-offs between short- and long-distance dispersal.

Analytic methods: In addition to computer simulation, we use a pair approximation to conduct an invasion analysis of different dispersal strategies.

Conclusions: Of the trade-offs we examined, only a context-sensitive recovery, in which an individual’s survival probability is enhanced by the presence of weaker neighbours, results in a mixed dispersal strategy.

Keywords: dispersal trade-off, invasion analysis, pair approximation, spatial disturbance.

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        © 2006 Jeffrey D. Achter. All EER articles are copyrighted by their authors. All authors endorse, permit and license Evolutionary Ecology Ltd. to grant its subscribing institutions/libraries the copying privileges specified below without additional consideration or payment to them or to Evolutionary Ecology, Ltd. These endorsements, in writing, are on file in the office of Evolutionary Ecology, Ltd. Consult authors for permission to use any portion of their work in derivative works, compilations or to distribute their work in any commercial manner.

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