Both local population and metapopulation dynamics were simulated by a model.The results indicate:(1)The extinctive time of a metapopulation increases first and then decreases as the number of reserves increases.That is,an intermediate reserve number is optimal for the survival of metapopulation.(2)The optimal number of small reserves established in a certain reserve was affected by the total area.This implies nature reserves of a certain area should be established to form a network consisting of several relatively small reserves rather than a few very large ones or many very small ones.
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