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Group Selection: The Genetic and Demographic Basis for the Phenotypic Differentiation of Small Populations of Tribolium castaneum

David E. McCauley and Michael J. Wade
Evolution
Vol. 34, No. 4 (Jul., 1980), pp. 813-821
DOI: 10.2307/2408035
Stable URL: http://www.jstor.org/stable/2408035
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Group Selection: The Genetic and Demographic Basis for the Phenotypic Differentiation of Small Populations of Tribolium castaneum
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Abstract

Wade and McCauley (1980) reported extensive differentiation in the trait, adult productivity, among a group of demes of effective size, 48, during 14 generations following isolation from a common stock. We selected two populations from this group: the population with the highest productivity (H) and the one with the lowest productivity (L). In this paper, the ecological mechanisms responsible for the observed difference in H and L productivities were studied by means of a series of crosses of individuals from these populations. These interdeme crosses were carried out for a number of different densities with a variable number of parents. We found that the interdeme productivity differences are the result of genetic differences among the demes for egg fertility, development time, larval sensitivity to crowding, adult and larval egg cannibalism, and adult and larval pupal cannibalism. Furthermore, as a result of the complex relationship between these characters and the populational phenotype, productivity, the phenotypes of the H and l demes responded differently to changes in population size and numbers.

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