Abstract

In modern landscapes, numerous taxa are threatened by the destruction and fragmentation of their habitat. Several butterfly species have become restricted to relatively small or completely isolated patches of habitat. Nevertheless, these fragmented habitats are usually not completely isolated from one another and many species can persist in a regional network of suitable habitat, connected via migration, as a metapopulation. The long-term survival of such a metapopulation is dependent on a balance between local extinction and (re)colonisation. The metapopulation theory predicts that the rates of colonisation increase as habitat patches become larger and better connected via migratory corridors. To promote species re-expansion through the landscape, networks of suitable habitat patches are required in close proximity to existing refuge populations. This can be achieved by management efforts of habitats.

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