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Title (Primary) Spatial synchrony through density-independent versus density-dependent dispersal
Author Münkemüller, T.; Johst, K.;
Journal Journal of Biological Dynamics
Year 2008
Department OESA; NSF;
Volume 2
Issue 1
Language englisch;
Keywords conditional dispersal; intraspecific density regulation; over-compensation; under- compensation; Gompertz; Microtus oeconomus
Abstract Many theoretical studies support the notion that strong dispersal fosters spatial synchrony. Nonetheless, the effect of conditional vs. unconditional dispersal has remained a matter of controversy. We scrutinize recent findings on a desynchronizing effect of negative density-dependent dispersal based on spatially explicit simulation models. Keeping net emigration rates equivalent, we compared density-independent and density-dependent dispersal for different types of intraspecific density regulation, ranging from under-compensation to over-compensation. In general, density-independent dispersal possessed a slightly higher synchronizing potential but this effect was very small and sensitive compared to the influence of the type of local density regulation. Notably, consistent outcomes for the comparison of conditional dispersal strategies strongly relied on the control of equivalent emigration rates. We conclude that the strength of dispersal is more important for spatial synchrony than its density dependence. Most important is the mode of intraspecific density regulation.
ID 1259
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=1259
Münkemüller, T., Johst, K. (2008):
Spatial synchrony through density-independent versus density-dependent dispersal
Journal of Biological Dynamics 2 (1), 31 - 39