003920000a220012100045001000019000002450103000196500016001226500020001386500013001586530024001710410013001957730062002081 aSjögren, Per10aExtinction and isolation gradients in metapopulations: the case of the pool frog (<rana Lessonae>)14aEvolución14aMetapoblaciones14aAnfibios  gRanaeRana Lessonae0 aInglés1 tBiological Journal of the Society3596h42q135-147d1991