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Poster De Conférence Année : 2017

A comparative study of acoustic variability in tonal calls of tolerant and intolerant macaques

Résumé

According to the "social complexity hypothesis", social systems characterized by complex relationships require high communicative complexity to regulate interactions between conspecifics. In particular, we may expect that elaborated negotiation skills are linked to a high variability of acoustic structures. To investigate this issue, we compared call durations, energy quantiles, and maxima, minima, starts and ends of fundamental frequencies in two species of macaques differing in their social style: rhesus macaques (Macaca mulatta) which display a steep gradient of dominance and a high degree of nepotism, and Tonkean macaques (Macaca tonkeana) which exhibit balanced dominance relationships and more open kin subgroups. We recorded the tonal calls emitted by adult females in two groups of rhesus macaques and four groups of Tonkean macaques kept in captive conditions. Comparisons revealed substantial interspecific contrasts. Differences between call types appeared wider in Tonkean than in rhesus macaques, and a larger number of acoustic variables contributed to the delineation of types in the former than in the latter. Moreover, contrary to rhesus macaques, Tonkean macaques could utter multi-unitary calls. These results support the hypothesis that tolerant macaques may have more variable communication signals than their more intolerant counterparts.
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Dates et versions

hal-01576459 , version 1 (23-08-2017)

Identifiants

  • HAL Id : hal-01576459 , version 1

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Nancy Rebout, Arianna de Marco, Elodie Massiot, Andrea Sanna, Roberto Cozzolino, et al.. A comparative study of acoustic variability in tonal calls of tolerant and intolerant macaques. Behaviour 2017 - 35th International Ethological Conference, Jul 2017, Estoril, Portugal. . ⟨hal-01576459⟩
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