Social bonds facilitate cooperative resource sharing in wild chimpanzees

Liran Samuni, Anna Preis, Alexander Mielke, Tobias Deschner, Roman M Wittig, Catherine Crockford

Research output: Contribution to journalArticlepeer-review

Abstract

Why share when access to benefits is uncertain is crucial to our understanding of the evolution of humans' extensive cooperation. Here, we investigated some of the different human sharing hypotheses and potential neuroendocrine mechanisms, in one of our closest living relatives, chimpanzees. The strongest predictor of sharing across food types was the presence of enduring and mutually preferred grooming partners, more than harassment, direct signalling, or trade. Moreover, urinary oxytocin levels were higher after the sharing of both individually and jointly acquired resources compared with controls. We conclude that the emotional connection inherent in social bonds was a key factor determining sharing patterns, with the oxytocinergic system potentially facilitating long-term cooperative exchanges. Testing for the role of social bonds in increasing predictability of sharing behaviour, a feature frequently overlooked, may help us to identify the evolutionary drivers of resource sharing and mechanisms that sustain delayed reciprocity between non-kin.
Original languageEnglish
Article number20181643
Number of pages9
JournalProceedings of the Royal Society B
Volume285
Issue number1888
Early online date10 Oct 2018
DOIs
Publication statusPublished - 10 Oct 2018

Keywords

  • Friendship
  • Oxytocin
  • Cooperation
  • Harassment
  • Pan troglodytes

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