Evolution of courtship song and reproductive isolation in the Drosophila willistoni species complex: do sexual signals diverge the most quickly?

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130 Citations (Scopus)

Abstract

Reproductive isolation increases with genetic distance between species. Although sexual selection may drive divergence of sexual signals and traits, causing rapid evolution of sexual isolation, quantitative data supporting this idea are rare. We examine the rates of divergence of a species-specific courtship signal, sexual isolation, and postmating isolation in the Drosophila willistoni group. Both types of isolation increase with genetic distance and postmating isolation is the most strongly correlated with genetic divergence, suggesting this has the least variable divergence rate. Song divergence is not correlated with genetic divergence. Homoplasy in song pattern results in poorly resolved phylogenies that are different from molecular phylogenies. Song evolves more quickly than sexual isolation, which evolves more quickly than postmating isolation.

Original languageEnglish
Pages (from-to)1493-1500
Number of pages8
JournalEvolution
Volume52
Issue number5
Publication statusPublished - Oct 1998

Keywords

  • courtship song
  • Drosophila
  • genetic distance
  • postmating isolation
  • sexual isolation
  • speciation
  • PREMATING ISOLATION
  • POECILIA-RETICULATA
  • NATURAL-SELECTION
  • SPECIATION
  • PATTERNS
  • PHYLOGENY
  • BEHAVIOR
  • ALLOZYME
  • TRAITS
  • FROGS

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