No evidence that polyandry benefits females in Drosophila melanogaster

William D. Brown, Adam Bjork, Karin Schneider, Scott Pitnick

Research output: Contribution to journalArticlepeer-review

59 Scopus citations


Understanding the evolution of polyandry (mating with multiple males) is a major issue in the study of animal breeding systems. We examined the adaptive significance of polyandry in Drosophila melanogaster, a species with well-documented costs of mating in which males generally cannot force copulations. We found no direct fitness advantages of polyandry. Females that mated with multiple males had no greater mean fitness and no different variance in fitness than females that mated repeatedly with the same male. Subcomponents of reproductive success, including fecundity, egg hatch rate, larval viability, and larval development time, also did not differ between polyandrous and monogamous females. Polyandry had no affect on progeny sex ratios, suggesting that polyandry does not function against costly sex-ratio distorters. We also found no evidence that polyandry functions to favor the paternity of males successful in precopulatory sexual selection. Experimentally controlled opportunities for precopulatory sexual selection had no effect on postcopulatory sperm precedence. Although these results were generally negative, they are supported with substantial statistical power and they help narrow the list of evolutionary explanations for polyandry in an important model species.

Original languageEnglish (US)
Pages (from-to)1242-1250
Number of pages9
Issue number6
StatePublished - Jun 2004


  • Multiple mating
  • Offspring viability
  • Polyandry
  • Reproductive success
  • Sexual selection
  • Sperm competition

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • General Agricultural and Biological Sciences


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