Sexual conflict over mating in Gnatocerus cornutus? Females prefer lovers not fighters

Kensuke Okada, Masako Katsuki, Manmohan D. Sharma, Clarissa M. House, David J. Hosken

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Female mate choice and male-male competition are the typical mechanisms of sexual selection. However, these two mechanisms do not always favour the same males. Furthermore, it has recently become clear that female choice can sometimes benefit males that reduce female fitness. So whether male- male competition and female choice favour the same or different males, and whether or not females benefit from mate choice, remain open questions. In the horned beetle, Gnatocerus cornutus, males have enlarged mandibles used to fight rivals, and larger mandibles provide a mating advantage when there is direct male-male competition for mates. However, it is not clear whether females prefer these highly competitive males. Here, we show that female choice targets male courtship rather than mandible size, and these two characters are not phenotypically or genetically correlated. Mating with attractive, highly courting males provided indirect benefits to females but only via the heritability of male attractiveness. However, mating with attractive males avoids the indirect costs to daughters that are generated by mating with competitive males. Our results suggest that male-male competition may constrain female mate choice, possibly reducing female fitness and generating sexual conflict over mating.

Original languageEnglish
Article number20140281
JournalProceedings of the Royal Society B: Biological Sciences
Volume281
Issue number1785
DOIs
Publication statusPublished - May 7 2014

Keywords

  • Direct benefits
  • Heritability
  • Indirect benefits
  • Sexual selection

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Environmental Science(all)
  • Agricultural and Biological Sciences(all)

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