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Older males signal more reliably.

Stephen R Proulx1, Troy Day, Locke Rowe

  • 1Department of Zoology, University of Toronto, 25 Harbord Street, Toronto, ON, M5S 3G5, Canada. proulx@proulxresearch.org

Proceedings. Biological Sciences
|December 24, 2002
PubMed
Summary

Female preference for older males may evolve because older males provide more reliable sexual signals. As males age and future reproduction opportunities diminish, their displays become more informative, benefiting females seeking fitter mates.

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Area of Science:

  • Evolutionary biology
  • Animal behavior
  • Sexual selection

Background:

  • Female preference for older males is controversial, often linked to perceived higher male fitness.
  • Previous models focused on scenarios where only age cues, not quality cues, are available.

Purpose of the Study:

  • To model male display in species with multiple reproductive bouts.
  • To identify conditions promoting reliable sexual signaling within age classes.
  • To explore the evolutionary basis of female preference for older mates.

Main Methods:

  • Developed a general mathematical model for male display.
  • Compared signaling strategies in species with single versus multiple reproductive bouts.
  • Analyzed the impact of future reproductive opportunities on signaling reliability.

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Main Results:

  • Males in species with multiple reproductive bouts reduce advertising compared to semelparous species due to future reproduction possibilities.
  • Higher-quality males reduce advertising more than lower-quality males.
  • Signaling reliability increases with age as future reproduction opportunities decrease, making older males' displays more informative.

Conclusions:

  • The possibility of future reproduction generally hinders reliable sexual signaling in species with multiple reproductive bouts.
  • Aging and the fading prospect of future reproduction enhance the reliability of male sexual displays.
  • This provides a novel explanation for female preference for older mates, as their displays offer more accurate quality information.