Sexual selection and assortative mating: an experimental test

A. Debelle*, Michael Gordon Ritchie, R. R. Snook

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Mate choice and mate competition can both influence the evolution of sexual isolation between populations. Assortative mating may arise if traits and preferences diverge in step, and, alternatively, mate competition may counteract mating preferences and decrease assortative mating. Here, we examine potential assortative mating between populations of Drosophila pseudoobscura that have experimentally evolved under either increased (‘polyandry’) or decreased (‘monogamy’) sexual selection intensity for 100 generations. These populations have evolved differences in numerous traits, including a male signal and female preference traits. We use a two males: one female design, allowing both mate choice and competition to influence mating outcomes, to test for assortative mating between our populations. Mating latency shows subtle effects of male and female interactions, with females from the monogamous populations appearing reluctant to mate with males from the polyandrous populations. However, males from the polyandrous populations have a significantly higher probability of mating regardless of the female's population. Our results suggest that if populations differ in the intensity of sexual selection, effects on mate competition may overcome mate choice.
Original languageEnglish
Pages (from-to)1307-1316
Number of pages10
JournalJournal of Evolutionary Biology
Issue number7
Early online date25 Mar 2016
Publication statusPublished - 11 Jul 2016


  • Drosophila
  • Experimental evolution
  • Female preference
  • Mate competition
  • Sexual conflict
  • Sexual isolation
  • Speciation


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