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


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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