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Group Selection and the Evolution of Dispersal

Leigh Van Valen
Evolution
Vol. 25, No. 4 (Dec., 1971), pp. 591-598
DOI: 10.2307/2406942
Stable URL: http://www.jstor.org/stable/2406942
Page Count: 8
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Group Selection and the Evolution of Dispersal
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Abstract

Selection within populations is normally against dispersal. New populations, however, are founded by dispersers, and if there is extinction of local populations there will be a balance between these modes of selection (group and individual). There are single-allele equilibria for given probabilities of extinction, the optimal values of dispersal equalling these probabilities, but polymorphism can occur if these equilibria are unattainable. The theory is homomorphic to that of the maintenance of colonizing species in a community. Group selection need not involve biotic adaptations and seems to be both common and, for dispersal ability, important.

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