On Wright's mechanism for intergroup selection.
A haploid model of Wright's (1945) intergroup selection is described. Several approximate analyses as well as Monte Carlo simulation show that Wright's mechanism leads to powerful selection for group advantageous traits in the face of strong local selection against them. Intergroup selection is favored by small local subpopulation size and by high, not low, rates of immigration into local groups, although the dependence on migration rate is not strong. These results and others cast doubt on the primacy of genic selfishness as a tenet of Darwinian theory.
Harpending
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Department of Anthropology, Pennsylvania State University, University Park 16802.
Rogers
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A
D000818:Animals; D005075:Biological Evolution; D003198:Computer Simulation; D005787:Gene Frequency; D005828:Genetics, Population; D006238:Haploidy; D008957:Models, Genetic; D009010:Monte Carlo Method; D012641:Selection, Genetic