Dominance, Coloration, and Social and Sexual Behavior in Male Drills Mandrillus leucophaeus

Authors: Marty, Jill¹; Higham, James²; Gadsby, Elizabeth³; Ross, Caroline⁴

Source: International Journal of Primatology, Volume 30, Number 6, December 2009 , pp. 807-823(17)

Publisher: Springer

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Abstract:

Sexual selection has driven the evolution and elaboration of a wide variety of displays and ornaments in male nonhuman primates, including capes, cheek flanges, and sexual coloration. Among the most sexually dimorphic of all primates is the drill (Mandrillus leucophaeus), the males of which can be 3 times the mass of females, possess large canines, and exhibit extremely bright sexual skin coloration. However, the function of male coloration in this species has never been examined. Here, we present data on male color (measured objectively using digital photography), dominance rank, measures of male-female association, and key sexual behaviors, of adult male drills (n = 17) living in four semi free-ranging enclosures at the Drill Rehabilitation and Breeding Center in Nigeria. We test the hypothesis that male coloration is a badge of status, indicating dominance rank, and the hypothesis that male coloration attracts females. We found that male coloration did indicate rank, and that high ranking, strongly colored males were more likely to associate with adult females, and more specifically with fully tumescent females. These males also engaged in more sexual activity. However, measures of male-female association and sexual behaviors were not related to male color once rank had been taken into consideration; i.e., for males of a given rank, females did not prefer those that were more colorful. We discuss the results in light of what is known about the wild drill social system, in which unfamiliar individuals may come together in “supergroups,” and in which quality indicators of competitive ability may be particularly important.

Keywords: color dichromatism; female choice; male-male competition; Mandrillus; sexual signals

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s10764-009-9382-x

Affiliations: 1: School of Human & Life Sciences, Roehampton University, Holybourne Avenue, London, SW15 4JD, UK 2: School of Human & Life Sciences, Roehampton University, London, SW15 4JD, UK 3: Pandrillus, H.E.P.O. Box 826, Calabar, Cross River State, Nigeria 4: School of Human & Life Sciences, Roehampton University, Holybourne Avenue, London, SW15 4JD, UK, Email: c.ross@roehampton.ac.uk

Publication date: 2009-12-01

Dominance, Coloration, and Social and Sexual Behavior in Male Drills Mandrillus leucophaeus

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