The effect of intrasexual fitness differences on genotype frequency stability at Fisherian sex ratio equilibrium

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9 Scopus citations

Abstract

Fisherian sex ratio evolution is based on a set of common assumptions which, if met, will result in the maintenance of an equilibrium sex ratio of 0.5. One of these assumptions is the absence of intrasexual fitness differences. To investigate Fisherian sex ratio selection, variation is provided by three factor sex determination systems like that found in the platyfish, Xiphophorus maculatus. Here, populations with genetically-based intrasexual fitness differences were established at a sex ratio predicted to be at Fisherian equilibrium. The frequency of earlier versus later maturing genotypes changed in these populations, resulting in a sex ratio of 0.5, but at a different point along a curve of Fisherian sex ratio equilibria. Thus it appears that genetic differences in fitness which are in linkage with sex-determining factors can result in evolution along the sex ratio equilibrium curve.

Original languageEnglish (US)
Pages (from-to)297-304
Number of pages8
JournalAnnales Zoologici Fennici
Volume38
Issue number3-4
StatePublished - 2001

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Animal Science and Zoology
  • Nature and Landscape Conservation

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