Ecology and Evolutionary Biology, Tulane University, New Orleans, LA 70118, USA.
Biol Lett. 2012 Jun 23;8(3):477-80. doi: 10.1098/rsbl.2011.0916. Epub 2011 Nov 16.
Metapopulation models are widely used to study species that occupy patchily distributed habitat, but are rarely applied to migratory species, because of the difficulty of identifying demographically independent subpopulations. Here, we extend metapopulation theory to describe the directed seasonal movement of migratory populations between two sets of habitat patches, breeding and non-breeding, with potentially different colonization and extinction rates between patch types. By extending the classic metapopulation model, we show that migratory metapopulations will persist if the product of the two colonization rates exceeds the product of extinction rates. Further, we develop a spatially realistic migratory metapopulation model and derive a landscape metric-the migratory metapopulation capacity-that determines persistence. This new extension to metapopulation theory introduces an important tool for the management and conservation of migratory species and may also be applicable to model the dynamics of two host-parasite systems.
迁徙种群模型广泛用于研究居住在斑块状栖息地的物种，但由于难以确定具有独立种群特征的亚种群，因此很少应用于迁徙物种。在这里，我们扩展了迁徙种群模型来描述两种栖息地斑块之间的有方向的季节性迁徙，繁殖和非繁殖斑块，斑块类型之间的定居和灭绝率可能不同。通过扩展经典的迁徙种群模型，我们发现如果两个定居率的乘积超过灭绝率的乘积，那么迁徙种群就会持续存在。此外，我们还开发了一个具有空间现实意义的迁徙种群模型，并得出了一个决定种群持续存在的景观度量指标——迁徙种群容量。这种对迁徙种群模型的新扩展为迁徙物种的管理和保护提供了一个重要的工具，也可能适用于模拟两个宿主-寄生虫系统的动态。
