Local dispersal can facilitate coexistence in the presence of permanent spatial heterogeneity

doi:10.1046/j.1461-0248.2003.00434.x

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Wiley InterScience

Ecology Letters

Volume 6 Issue 4, Pages 301 - 309

Published Online: 13 Mar 2003

Published on behalf of the Centre National de la Recherche Scientifique

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Local dispersal can facilitate coexistence in the presence of permanent spatial heterogeneity

Robin E. Snyder* and Peter Chesson

Section of Evolution and Ecology, University of California, Davis, CA 95616, USA

* Correspondence: E-mail: resnyder@ucdavis.edu

¹ is infinite when ω = 0. However, for nonpathological examples, S_ζ(ω) = 0 when ω = 0, and so the potential pole is suppressed.

² The formalism presented in Chesson (2000a) assumes that E varies over a finite interval of length σ.

KEYWORDS

Coexistence • dispersal • spatial ecology • spatial heterogeneity

Abstract

An expression for the growth density covariance

Appendix. Derivation of the growth density covariance formula

AbstractIn the presence of permanent spatial heterogeneity, local dispersal, especially short-range dispersal, can facilitate coexistence by concentrating low-density species in the areas where their rates of increase are higher. We present a framework for predicting the effects of local dispersal on coexistence for arbitrary forms of dispersal and arbitrary spatial patterns of environmental variation. Using the lottery model as an example, we find that local dispersal contributes to coexistence by enhancing the effects of environmental variation on scales longer than typical dispersal distances, which can be characterized solely by the variance of the dispersal kernel. Higher moments of the dispersal kernel are not important.

Manuscript received 15 October 2002 First decision made 22 November 2002 Manuscript accepted 16 December 2002

DIGITAL OBJECT IDENTIFIER (DOI)

10.1046/j.1461-0248.2003.00434.x About DOI