Tolerant and intolerant macaques show different levels of structural complexity in their vocal communication.

Proceedings. Biological Sciences
Nancy ReboutB Thierry

Abstract

We tested the social complexity hypothesis which posits that animals living in complex social environments should use complex communication systems. We focused on two components of vocal complexity: diversity (number of categories of calls) and flexibility (degree of gradation between categories of calls). We compared the acoustic structure of vocal signals in groups of macaques belonging to four species with varying levels of uncertainty (i.e. complexity) in social tolerance (the higher the degree of tolerance, the higher the degree of uncertainty): two intolerant species, Japanese and rhesus macaques, and two tolerant species, Tonkean and crested macaques. We recorded the vocalizations emitted by adult females in affiliative, agonistic and neutral contexts. We analysed several acoustic variables: call duration, entropy, time and frequency energy quantiles. The results showed that tolerant macaques displayed higher levels of vocal diversity and flexibility than intolerant macaques in situations with a greater number of options and consequences, i.e. in agonistic and affiliative contexts. We found no significant differences between tolerant and intolerant macaques in the neutral context where individuals are not directly involv...Continue Reading

Associated Datasets

Jun 5, 2020·Alban LemassonNancy Rebout

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Citations

May 7, 2021·American Journal of Primatology·Alessandra ZannellaElisabetta Palagi
Aug 6, 2021·Royal Society Open Science·Eithne KavanaghKatie Slocombe
Aug 28, 2020·The Behavioral and Brain Sciences·Samuel A MehrEdward H Hagen
Nov 16, 2021·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Juan David LeongómezS Craig Roberts
Dec 8, 2021·Biological Reviews of the Cambridge Philosophical Society·Loïc PougnaultAlban Lemasson

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