Species are conserved because they are rare, endemic, large, attractive, or of economic importance. In this paper, I suggest that some species should also be conserved because they have a disproportionate effect on the persistence of all other species — they are “keystone” species.


Migration Europe Cretaceous Pleistocene Peru 
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© Springer-Verlag Berlin Heidelberg 1994

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  • W. J. Bond

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