Effects of patch number and dispersal patterns on population dynamics and synchrony

In this paper, we examine the effects of patch number and different dispers al patterns on dynamics of local populations and on the level of synchrony between them. Local population renewal is governed by the Ricker model and we also consider asymmetrical dispersal as well as the presence of environm ental heterogeneity. Our results show that both population dynamics and the level of synchrony differ markedly between two and a larger number of loca l populations. For two patches different dispersal rules give very versatil e dynamics. However, for a larger number of local populations the dynamics are similar irrespective of the dispersal rule. For example, for the parame ter values yielding stable or periodic dynamics in a single population, the dynamics do not change when the patches are coupled with dispersal. High i ntensity of dispersal does not guarantee synchrony between local population s. The level of synchrony depends also on dispersal rule, the number of loc al populations, and the intrinsic rate of increase. In our study, the effec ts of density-independent and density-dependent dispersal rules do not show any consistent difference. The results call for caution when drawing gener al conclusions from models of only two interacting populations and question the applicability of a large number of theoretical papers dealing with two local populations. (C) 2000 Academic Press.