is infinite when ω = 0. However, for nonpathological examples, S(ω) = 0 when ω = 0, and so the potential pole is suppressed.
Local dispersal can facilitate coexistence in the presence of permanent spatial heterogeneity
Article first published online: 13 MAR 2003
Volume 6, Issue 4, pages 301–309, April 2003
How to Cite
Snyder, R. E. and Chesson, P. (2003), Local dispersal can facilitate coexistence in the presence of permanent spatial heterogeneity. Ecology Letters, 6: 301–309. doi: 10.1046/j.1461-0248.2003.00434.x
The formalism presented in Chesson (2000a) assumes that E varies over a finite interval of length σ.
- Issue published online: 13 MAR 2003
- Article first published online: 13 MAR 2003
- Manuscript received 15 October 2002 First decision made 22 November 2002 Manuscript accepted 16 December 2002
- spatial ecology;
- spatial heterogeneity
Abstract In 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.