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Evolution under the multiallelic Levene model. (English) Zbl 1112.92047

Summary: The evolution of the multiallelic H. Levene model [Genetic equilibrium when more than one ecological niche is available. Am. Nat. 87, 311–313 (1953)] is investigated. New sufficient conditions for nonexistence of a completely polymorphic equilibrium and for global loss of an allele and information on which allele(s) will be lost are deduced from some new results on multidimensional recursion relations. In the absence of dominance, a more detailed analysis is presented. Sufficient conditions for global fixation of a particular allele are established. When the number of alleles equals the number of demes, necessary and sufficient conditions for the existence of an isolated, globally asymptotically stable, completely polymorphic equilibrium point are derived, and this equilibrium is explicitly determined. Three examples, one with arbitrarily many alleles and two with three alleles, illustrate the theory.

MSC:

92D15 Problems related to evolution
39A99 Difference equations
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