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Sexual adaptation: is female–male mounting a supernormal courtship display in Japanese macaques?

In: Behaviour
Authors:
Noëlle Gunst Department of Psychology, University of Lethbridge, 4401 University Drive West, Lethbridge, AB, Canada T1K 3M4

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https://orcid.org/0000-0003-4205-1562
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Jean-Baptiste Leca Department of Psychology, University of Lethbridge, 4401 University Drive West, Lethbridge, AB, Canada T1K 3M4
School of Natural and Engineering Sciences National Institute of Advanced Studies, Bangalore, India

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https://orcid.org/0000-0002-2371-671X
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Paul L. Vasey Department of Psychology, University of Lethbridge, 4401 University Drive West, Lethbridge, AB, Canada T1K 3M4

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Abstract

We analysed heterosexual consortships in a free-ranging group of Japanese macaques in which adult females routinely perform female-to-male mounting (FMM). We tested whether FMM is more efficient (i.e., a ‘supernormal courtship’ behavioural pattern) than species-typical female-to-male sexual solicitations (FMSS) at prompting subsequent male-to-female mounts (MFM). In a context of high female-female competition for male mates, we found that (1) FMM functioned to focus the male consort partner’s attention as efficiently as FMSS and prevented him from moving away, and (2) FMM was more efficient than species-typical FMSS at expediting MFM (i.e., the most fitness-enhancing sexual behaviour of a mating sequence). We concluded that FMM could be considered a supernormal courtship behavioural pattern in adult female Japanese macaques. This population-specific sexual adaptation may result from a combination of favourable socio-demographic conditions. This study has implications for the evolutionary history of non-conceptive mounting patterns in Japanese macaques and non-conceptive sexuality in humans.

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