Testicular function, secondary sexual development, and social status in male mandrills (Mandrillus sphinx)

@article{Wickings1992TesticularFS,
  title={Testicular function, secondary sexual development, and social status in male mandrills (Mandrillus sphinx)},
  author={E. Jean Wickings and Alan F. Dixson},
  journal={Physiology \& Behavior},
  year={1992},
  volume={52},
  pages={909-916}
}
Positive correlations between dominance rank and plasma testosterone levels have been described for adult males of several primate species in captivity, but the relevance of such observations to free-ranging animals is unclear. CIRMF in Gabon maintains a breeding group of 45 mandrills in a six hectare, naturally rainforested enclosure. This study describes correlations between dominance rank (in agonistic encounters), levels of plasma testosterone, testicular volume, body weight, and… Expand
Arrested development of secondary sexual adornments in subordinate adult male mandrills (Mandrillus sphinx).
TLDR
It is suggested that only alpha males have sufficient testosterone to develop full secondary sexual characteristics, and possible socioendocrine mechanisms underlying the suppression of testosterone and secondary sexual development in subordinate adults are proposed. Expand
Developmental variables and dominance rank in adolescent male mandrills (Mandrillus sphinx)
TLDR
Adolescent males that were dominant for their age had higher testosterone levels, larger testes, and more advanced secondary sexual development than subordinate males. Expand
Changes in the Secondary Sexual Adornments of Male Mandrills (Mandrillus sphinx) Are Associated with Gain and Loss of Alpha Status
TLDR
It is demonstrated that male-male competition and rank reversals have remarkable effects upon testicular function, secondary sexual traits, and behavior in the adult male mandrill. Expand
Life history in male mandrills (Mandrillus sphinx): physical development, dominance rank, and group association.
TLDR
Adult males were always the most social, and the most brightly colored males, but were not necessarily the largest males present, and alpha male tenure was related to group demography, with larger numbers of rival adult males and maturing adolescent males reducing the time a male spent as alpha male. Expand
Sexual selection and reproductive careers in mandrills (Mandrillus sphinx)
In sexually dimorphic, polygynous species, where males provide little parental care and competition between males for access to fertile females is high, sexual selection theory predicts sexExpand
Reproductive success in the mandrill, Mandrillus sphinx: correlations of male dominance and mating success with paternity, as determined by DNA fingerprinting
TLDR
The results of behavioural and genetic studies on mandrills demonstrate unequivocally that clear-cut relationships exist between male secondary sexual development, social dominance, copulatory behaviour and reproductive success in the social group. Expand
Low Testosterone Correlates with Delayed Development in Male Orangutans
TLDR
While androgen variation had previously been viewed as a state-dependent characteristic of male developmental status, this study reveals that differences in the physiology of early and late developing males are detectable long past the developmental transition and may instead be trait-level characteristics associated with a male’s life history strategy. Expand
Circannual changes in the secondary sexual adornments of semifree‐ranging male and female mandrills (Mandrillus sphinx)
TLDR
Male mandrills did not exhibit marked circannual changes in secondary sexual traits during the mating season, and there was some evidence to suggest that maturing males showed increased development of red sexual skin during mating periods, but once males had fully developed secondary sexual adornments, they remained stable throughout the year. Expand
Behavioural Development in Male Mandrills (Mandrillus sphinx): Puberty to Adulthood
TLDR
This study describes behavioural development in adolescent male mandrills and examines the process of peripheralisation and reintegration into the social group, concluding that peripheralisation represents a tactic to avoid feeding and male-male competition, while undergoing dramatic development in body size and morphology. Expand
Growth and ontogeny of sexual size dimorphism in the mandrill (Mandrillus sphinx).
TLDR
M maternal factors affect reproductive success in both sexes, influencing the age at which offspring mature and begin their reproductive career, and to investigate maternal influences upon growth. Expand
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