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A theory of group selection
Proceedings of the National Academy of Sciences
Format: Journal Article
Publication Year: 1975
Pages: 143 - 146
Source ID: shanti-sources-48816
Collection: Altruism
Abstract: In organisms possessing a dispersal phase the processes of mating, competition, feeding, and predation are often carried out within "trait-groups," defined as populations enclosed in areas smaller than the boundaries of the deme. A simple model shows that this can lead to the selection of "altruistic" traits that favor the fitness of the group over that of the individual. The extent of group selection that occurs depends mainly on the variation in the composition of genotypes between trait-groups. The traditional concepts of group and individual selection are seen as two extremes of a continuum, with systems in nature operating over the interval in between.