The Royal Society

Supplementary material from "Dominance style is a key predictor of vocal use and evolution across nonhuman primates"

Posted on 2021-07-23 - 05:30
Animal communication has long been thought to be subject to pressures and constraints associated with social relationships. However, our understanding of how the nature and quality of social relationships relates to the use and evolution of communication is limited by a lack of directly comparable methods across multiple levels of analysis. Here, we analysed observational data from 111 wild groups belonging to 26 non-human primate species, to test how vocal communication relates to dominance style (the strictness with which a dominance hierarchy is enforced, ranging from ‘despotic’ to ‘tolerant’). At the individual-level, we found that dominant individuals who were more tolerant vocalized at a higher rate than their despotic counterparts. This indicates that tolerance within a relationship may place pressure on the dominant partner to communicate more during social interactions. At the species-level, however, despotic species exhibited a larger repertoire of hierarchy-related vocalizations than their tolerant counterparts. Findings suggest primate signals are used and evolve in tandem with the nature of interactions that characterize individuals' social relationships.


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Royal Society Open Science


Eithne Kavanagh
Sally E. Street
Felix O. Angwela
Thore J. Bergman
Maryjka B. Blaszczyk
Laura M. Bolt
Margarita Briseño-Jaramillo
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Melissa Emery Thompson
Alejandro Estrada
Claudia Fichtel
Barbara Fruth
Marco Gamba
Cristina Giacoma
Kirsty E. Graham
Samantha Green
Cyril C. Grueter
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