Density dependent behavior at habitat boundaries and the allee effect
Density dependent behavior at habitat boundaries and the allee effect
复制标题
DOI：
10.1007/s11538-007-9222-0
复制
发表时间：
2007-10-01
影响因子：
3.5
通讯作者：
Cosner, Chris
中科院分区：
文献类型：
--
作者：
Cantrell, Robert Stephen;Cosner, Chris
栖息地边缘会对种群产生多种影响，包括改变它们的扩散模式。扩散模式可以影响种群动态。在本文中，我们探讨了一种扩散模式可能产生的影响，其中生物体对栖息地斑块边界的响应取决于其局部密度。我们模拟了在斑块内按逻辑方式扩散和生长的生物体种群，但随着斑块内同种局部密度的增加，个体跨越斑块边界离开斑块的可能性会减少。斑块边界的这种行为已在格兰维尔贝母蝴蝶中观察到，并被提议作为在斑块水平上产生 Allee 效应的机制。我们的模型预测，这种行为确实可以在斑块水平上引发 Allee 效应，即使斑块内的局部种群动态中没有这种效应。这些模型相对简单，并不是为了给出任何特定种群的完整描述，而只是为了验证斑块边界处密度依赖的扩散行为机制能够改变斑块内的种群动态的想法。
Habitat edges can have a number of effects on populations, including modifying their patterns of dispersal. Dispersal patterns can influence population dynamics. In this paper, we explore the possible effects of a pattern of dispersal where the response of organisms to the boundary of a habitat patch depends on their local density. We model a population of organisms diffusing and growing logistically inside a patch, but with the likelihood of an individual crossing the patch boundary to leave the patch decreasing as the local density of conspecifics within the patch increases. Such behavior at patch boundaries has been observed among Glanville fritillary butterflies, and has been proposed as a mechanism for generating an Allee effect at the patch level. Our models predict that the behavior can indeed induce an Allee effect at the patch level even though there is no such effect built into the local population dynamics inside the patch. The models are relatively simple and are not intended to give a complete description of any particular population, but only to verify the idea that the mechanism of density-dependent dispersal behavior at a patch boundary is capable of altering population dynamics within the patch.