Abstract:The fragmentation of natural habitats is a current global crisis.It is a great challenge to human beings to protect species diversity.Not many of us are familiar with oceanic islands,which supplied key examples for the theory of island biogeography,but all of us are familiar with the loss and fragmentation of some natural habitats in which biota exist.The theory of island biogeography and the metapopulation dynamic theory are two fundamentally theoretical bases for species conservation;the former is concern...