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Summary: MIXED DISPERSAL STRATEGIES AND RESPONSE TO
DISTURBANCE
JEFFREY D. ACHTER AND COLLEEN T. WEBB
ABSTRACT.
Question: How does selection mediated by a spatially spreading dis-
turbance affect individual-level dispersal and population-level spa-
tial structure?
Model features: We start with a birth-death process on a lattice and
introduce a spatially spreading disturbance. We consider three dif-
ferent scenarios affecting whether an individual recovers from dis-
turbance, 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 disper-
sal 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 neighbors, results in a mixed dispersal
strategy.
1. INTRODUCTION
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