Female chimpanzees use copulation calls flexibly to prevent social competition

Simon W. Townsend, Tobias Deschner, Klaus Zuberbuehler

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)
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Abstract

The adaptive function of copulation calls in female primates has been debated for years. One influential idea is that copulation calls are a sexually selected trait, which enables females to advertise their receptive state to males. Male-male competition ensues and females benefit by getting better mating partners and higher quality offspring. We analysed the copulation calling behaviour of wild female chimpanzees (Pan troglodytes schweinfurthii) at Budongo Forest, Uganda, but found no support for the male-male competition hypothesis. Hormone analysis showed that the calling behaviour of copulating females was unrelated to their fertile period and likelihood of conception. Instead, females called significantly more while with high-ranking males, but suppressed their calls if high-ranking females were nearby. Copulation calling may therefore be one potential strategy employed by female chimpanzees to advertise receptivity to high-ranked males, confuse paternity and secure future support from these socially important individuals. Competition between females can be dangerously high in wild chimpanzees, and our results indicate that females use their copulation calls strategically to minimise the risks associated with such competition.

Original languageEnglish
Article numbere2431
Pages (from-to)-
Number of pages7
JournalPLoS One
Volume3
Issue number6
DOIs
Publication statusPublished - 18 Jun 2008

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