Continual change in mate preferences (original) (raw)

Nature volume 377, pages 420–422 (1995)Cite this article

Abstract

SECONDARY sexual characters are highly variable both within_1_ and between species_2-6_. Closely related species often differ markedly in sexual morphology but hardly at all in non-sexual traits_2-5_. Here we show that Fisher's runaway process of sexual selection is intrinsically unstable and naturally leads to continual change in sexual traits. Runaway leads to semi-stable exaggeration of female preference for a male sexual character, followed by a slow decay of both traits until runaway is triggered again in a different direction. The process then repeats itself resulting in continual change in male sexual traits through time. Allopatric populations are thus expected to diverge without drift or substantial changes in selective pressures. If there is significant mutation bias acting on the male trait, continual change stops and a stable equilibrium appears. Such an outcome is more likely when exaggeration of the male sexual trait signals good genes.

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Authors and Affiliations

  1. Department of Biology, Faculty of Science, Kyushu University, Fukuoka, 812-81, Japan
    Yoh Iwasa
  2. Department of Genetics and Biometry, University College London, 4 Stephenson Way, London, NW1 2HE, UK
    Andrew Pomiankowski

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  1. Yoh Iwasa
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  2. Andrew Pomiankowski
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Iwasa, Y., Pomiankowski, A. Continual change in mate preferences.Nature 377, 420–422 (1995). https://doi.org/10.1038/377420a0

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