The effect of variable frequency of sexual reproduction on the genetic structure of natural populations of a cyclical parthenogen

Desiree E. Allen, Michael Lynch

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Cyclical parthenogens are a valuable system in which to empirically test theoretical predictions as to the genetic consequences of sexual reproduction in natural populations, particularly if the frequency of sexual relative to asexual reproduction can be quantified. In this study, we used a series of lake populations of the cyclical parthenogen, Daphnia pulicaria, that vary consistently in their investment in sexual reproduction, to address the questions of whether the ecological variation in investment in sex is detectable at the genetic level, and if so, whether the genetic patterns seen are consistent with theoretical predictions. We show that there is variation in the genetic structure of these populations in a manner consistent with their investment in sexual reproduction. Populations engaging in a high frequency of sex were in Hardy-Weinberg and gametic phase equilibrium, and showed little genotypic differentiation across sampled years. In contrast, populations with a lower frequency of sex deviated widely from equilibrium, had reduced multilocus clonal diversity, and showed significant temporal genotypic deviation.

Original languageEnglish (US)
Pages (from-to)919-926
Number of pages8
JournalEvolution
Volume66
Issue number3
DOIs
StatePublished - Mar 1 2012
Externally publishedYes

Keywords

  • Asexual
  • Cyclical parthenogen
  • Daphnia
  • Sexual

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Agricultural and Biological Sciences(all)

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