Density-dependent dispersal and relative dispersal affect the stability of predator-prey metacommunities
Density-dependent dispersal and relative dispersal affect the stability of predator-prey metacommunities
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DOI：
10.1016/j.jtbi.2010.07.008
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发表时间：
2010-10-07
影响因子：
2
通讯作者：
Loreau, Michel
中科院分区：
文献类型：
--
作者：
Hauzy, Celine;Gauduchon, Mathias;Loreau, Michel
虽然密度依赖扩散和相对扩散（物种之间的扩散率差异）已在自然系统中被记录，但它们对亚稳态稳定性的影响知之甚少。在这里，我们调查的影响，种内和种间的密度依赖扩散的区域稳定性的捕食者-猎物的metacracity模型。我们发现，当种群的动态达到平衡时，密度依赖扩散的稳定性不受影响。然而，区域的稳定性，衡量区域的变异性或持久性，可以修改密度依赖的扩散时，当地人口随时间波动。此外，这些影响取决于捕食者和猎物的相对分散。区域稳定性通过空间同步性的变化而改变。种间密度依赖扩散总是desperizes当地的动态，而种内密度依赖扩散可能同步或desperizes它取决于扩散率。此外，种内和种间密度依赖的扩散加强了捕食者在中等扩散率下对猎物的自上而下的控制。因此，在中等扩散率下，变晶性的区域稳定性增加。我们的研究结果表明，密度依赖的扩散和物种的相对扩散是理解生态系统的响应破碎化的关键。(C)2010爱思唯尔有限公司版权所有。
Although density-dependent dispersal and relative dispersal (the difference in dispersal rates between species) have been documented in natural systems, their effects on the stability of metacommunities are poorly understood. Here we investigate the effects of intra- and interspecific density-dependent dispersal on the regional stability in a predator-prey metacommunity model. We show that, when the dynamics of the populations reach equilibrium, the stability of the metacommunity is not affected by density-dependent dispersal. However, the regional stability, measured as the regional variability or the persistence, can be modified by density-dependent dispersal when local populations fluctuate over time. Moreover these effects depend on the relative dispersal of the predator and the prey. Regional stability is modified through changes in spatial synchrony. Interspecific density-dependent dispersal always desynchronizses local dynamics, whereas intraspecific density-dependent dispersal may either synchronize or desynchronize it depending on dispersal rates. Moreover, intra- and interspecific density-dependent dispersal strengthen the top-down control of the prey by the predator at intermediate dispersal rates. As a consequence the regional stability of the metacommunity is increased at intermediate dispersal rates. Our results show that density-dependent dispersal and relative dispersal of species are keys to understanding the response of ecosystems to fragmentation. (C) 2010 Elsevier Ltd. All rights reserved.