Measuring facial symmetry in the wild: a case study in Olive Baboons (Papio anubis)

Boulton, Rebecca A.; Ross, Caroline

doi:10.1007/s00265-013-1495-8

Cited by 2 publications

(2 citation statements)

References 42 publications

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“…When processing the images, some facial photographs were tilted clockwise or counterclockwise. To ensure methods were repeatable, images were straightened along the center of the focal's eyes (following Ward, 2017;Boulton and Ross, 2013).…”

Section: Collection and Measurement Of Dark Facial Colourationmentioning

confidence: 99%

The Role of Male Facial Color as a 'Badge of Status' in Barbary macaques (Macaca sylvanus)

Satishchandran

2023

Preprint

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Sexual selection is driven by two main mechanisms, intrasexual selection and intersexual selection. Classically, elaborate male ornamentation is considered to function as an intersexual signal, in which females choose potential mates on the basis of their conspicuous colouration. However, some studies have shown that male sexual ornamentation may also serve as an intersexual signal of strength or dominance (as ‘badges of status’), mediating conflict between males. Among primates, such signals often comprise bright colouration on the face, scrotum, or chest. The potential function as a badge of status of the dark facial colouration seen in a number of primate species is less explored. In this study of male Barbary macaques (Macaca sylvanus) living in a semi-free ranging enclosure at Trentham Monkey Forest, I predicted that darker faced males would be higher ranked, receive higher rates of submissive behavior, and spend less time with males in close proximity, respectively. I found that male facial colour was not related to rank, rate of submissions received or patterns of proximity to conspecifics. Thus, this work does not support the hypothesis that dark facial colouration serves as an intrasexual badge of status in this species.

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Section: Collection and Measurement Of Dark Facial Colourationmentioning

confidence: 99%

The Role of Male Facial Color as a 'Badge of Status' in Barbary macaques (Macaca sylvanus)

Satishchandran

2023

Preprint

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“…In the case of weaning (and presumably other stresses), differences exist between captive groups and those in the wild where developmental delay is common due to greater variance in environmental stress (Zihlman, Bolter & Boesch, 2004). In nonhuman primates, most published data are neither collected on dentition nor used to examine developmental differences based on sex or life history (Atkinson, Rogers & Cheverud, 2016;Boulton & Ross, 2013;Hallgrimsson, 1993;Leigh & Cheverud, 1991;Little et al, 2012;Newell-Morris, Fahrenbruch & Sackett, 1989;Reeves, Auerbach & Sylvester, 2016;Sefcek & King, 2007;Waitt & Little, 2006;Willmore, Klingenberg & Hallgrímsson, 2005).…”

Section: Introductionmentioning

confidence: 99%

Developmental instability in wild Nigerian olive baboons (Papio anubis)

Hoover

Gelipter

Sommer

et al. 2021

PeerJ

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Background Developmental instability in archaeological samples can be detected through analysis of skeletal and dental remains. During life, disruptions to biological internal homeostasis that occur during growth and development redirect bodily resources to returning to homeostasis and away from normal processes such as symmetrical development. Because dental enamel does not remodel in life, any deviations from normal development are left behind. Even subtle disturbances to developmental trajectory may be detected in asymmetrical development of traits, specifically a random variation in sides termed fluctuating asymmetry. Human dental fluctuating asymmetry studies are common, but here we investigate the permanent dentition of a non-human primate Papio anubis, for potential fluctuating asymmetry relative to sex, weaning, and reproductive maturity. The sample stems from an outlier population that lives in the wettest and most humid habitat of any studied baboon group. Methods The skulls of adult baboons were collected after their natural death in Gashaka Gumti National Park, Nigeria. The permanent dentition of antimeric teeth (paired) were measured for maximum length and breadth using standard methods. The metrics were analyzed to assess the presence of fluctuating asymmetry in adult permanent mandibular and maxillary dentition. Measurement error and other forms of asymmetry (antisymmetry, directional asymmetry) were considered and dental measures expressing true fluctuating asymmetry were used to address three research questions. Results Males exhibit greater fluctuating asymmetry than females, suggesting that males experience greater overall instability during the developmental period. While weaning is not more stressful than other life history stages for males and females (using the first molar fluctuating asymmetry index as a proxy compared to other teeth), it is more stressful for females than males. The onset of reproduction is also not more stressful than other life history stages for males and females (using the third molar fluctuating asymmetry index as a proxy compared to other teeth), but it is more stressful for males than females. We explore possible explanations for these findings in the discussion.

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Measuring facial symmetry in the wild: a case study in Olive Baboons (Papio anubis)

Cited by 2 publications

References 42 publications

The Role of Male Facial Color as a 'Badge of Status' in Barbary macaques (Macaca sylvanus)

The Role of Male Facial Color as a 'Badge of Status' in Barbary macaques (Macaca sylvanus)

Developmental instability in wild Nigerian olive baboons (Papio anubis)

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