Evolutionary biology: What's in a baboon's behind?

@article{Dunbar2001EvolutionaryBW,
  title={Evolutionary biology: What's in a baboon's behind?},
  author={Robin I. M. Dunbar},
  journal={Nature},
  year={2001},
  volume={410},
  pages={158-158}
}
It is often thought that sexual 'ornaments', such as the swellings that adorn ovulating female baboons, are signalling something about fertility — but what? Long-term studies of wild baboons provide an answer. 

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References

SHOWING 1-6 OF 6 REFERENCES

The evolution of conspicuous oestrous advertisement in Old World monkeys

It is argued that prominent oestrous swellings are sexually selected traits that reliably advertise some aspect of a female's quality or condition, and which have evolved because of competition among females to attract males.

The Relationship between Concealed Ovulation and Mating Systems in Anthropoid Primates: A Phylogenetic Analysis

There is a linkage between absence of ovulation signs and monogamy, but the temporal relationship is generally such that the lack of ovulatory signs is more likely to promote monogamy than monogamy is to promote a lack of Ovulatory signs.

The evolution of exaggerated sexual swellings in primates and the graded-signal hypothesis

  • C. Nunn
  • Biology, Psychology
    Animal Behaviour
  • 1999
It is suggested that exaggerated swellings can be viewed as distributions representing the probability of ovulation (the graded-signal hypothesis), which makes testable predictions for future comparative and observational research.

Sexual swellings advertise female quality in wild baboons

It is shown that sexual swellings in wild baboons reliably advertise a female's reproductive value over her lifetime, in accordance with a theoretical model of honest signalling.

Infanticide risk and the evolution of male–female association in primates

A fundamental link between primate life history and social behaviour is demonstrated, the most basic type of variation in primate social organization is explained, and an additional determinant of social organization that may also operate in other mammals is proposed.

Primate Consortships: A Critical Review

A conceptual framework is developed in which variation among male/estrous‐female dyads is characterized in terms of three functionally relevant dimensions: mate assessment, courtship, and mate guarding, which shows inconsistency in the use of the consortship concept is problematic.