| patchy population structure in a short-distance migrant: evidence from genetic and demographic data. | species often occur in subdivided populations as a consequence of spatial heterogeneity of the habitat. to describe the spatial organization of subpopulations, existing theory proposes three main population models: patchy population, metapopulation and isolated populations. these models differ in their predicted levels of connectivity among subpopulations, and in the risk that a subpopulation will go extinct. however, spatially discrete subpopulations are commonly considered to be organized as m ... | 2009 | 19457204 |