UFZ Centre for Environmental Research Leipzig-Halle, Department of Ecological Modelling, Permoserstr., 15, 04318 Leipzig, Germany.
J Biol Dyn. 2008 Jan;2(1):31-9. doi: 10.1080/17513750801942529.
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.
许多理论研究支持这样一种观点，即强扩散促进了空间同步。然而，有条件扩散与无条件扩散的影响仍然存在争议。我们仔细研究了基于空间显式模拟模型的负密度依赖扩散具有去同步化效应的最新发现。在保持净迁出率相等的情况下，我们比较了不同种内密度调节类型的密度独立和密度依赖扩散，范围从补偿不足到过度补偿。一般来说，密度独立扩散具有稍高的同步潜力，但与局部密度调节类型的影响相比，这种效应非常小且敏感。值得注意的是，条件扩散策略比较的一致结果强烈依赖于等效迁出率的控制。我们的结论是，扩散的强度对空间同步比密度依赖性更为重要。最重要的是种内密度调节模式。
