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Does brain size affect mate choice? An experimental examination in pygmy halfbeaks

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  • Rebecca M McNeil
  • Alessandro Devigili
  • Niclas Kolm
  • John L Fitzpatrick

Abstract

Choosing a mate is one of the most important decisions in an animal’s lifetime. Female mate choice is often guided by the presence or intensity of male sexual ornaments, which must be integrated and compared among potential mates. Individuals with greater cognitive abilities may be better at evaluating and comparing sexual ornaments, even when the difference in ornaments is small. While brain size is often used as a proxy for cognitive ability, its effect on mate choice has rarely been investigated. Here, we investigate the effect of brain size on mate preferences in the pygmy halfbeak Dermogenys collettei, a small freshwater fish that forms mixed-sex shoals where mating takes place. Pygmy halfbeaks are ideal models as their semi-transparent heads allow for external brain measurements. After validating the use of external measurements as a proxy for internal brain size, we presented females with large or small brains (relative to body length) with two males that had either a large or small difference in sexual ornamentation (measured by the total area of red coloration). Unexpectedly, neither total relative brain size nor relative telencephalon size affected any measured aspect of mate preference. However, the difference in male sexual ornamentation did affect preference, with females preferring males with a smaller area of red coloration when the difference in ornaments was large. This study highlights the complexities of mate choice and the importance of considering a range of stimuli when examining mate preferences.

Suggested Citation

  • Rebecca M McNeil & Alessandro Devigili & Niclas Kolm & John L Fitzpatrick, 2021. "Does brain size affect mate choice? An experimental examination in pygmy halfbeaks," Behavioral Ecology, International Society for Behavioral Ecology, vol. 32(6), pages 1103-1113.
  • Handle: RePEc:oup:beheco:v:32:y:2021:i:6:p:1103-1113.
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    File URL: http://hdl.handle.net/10.1093/beheco/arab046
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