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Article Dans Une Revue International Journal of Primatology Année : 2021

Temporal calling patterns of a captive group of chimpanzees (Pan troglodytes)

Résumé

Unlike the acoustic features of calls, the temporal patterns of call usage in nonhuman primates are highly flexible. Our recent studies suggest that vocal patterns and species social needs coevolved. Different patterns, for example calling alone by producing one or several calls in a sequence or interacting vocally with more or less call overlap, may serve different functions. Vocal turn-taking in particular may be key to understanding the possible link between vocal behavior and social life. Turn-taking is used flexibly in many primate species, notably during affiliative encounters, and follows social and temporal rules that evoke similarities with human conversations. We tested the influence of caller characteristics and production context on the vocal behavior of a captive group of 15 chimpanzees using 48h30 of scan and focal sampling. 84% of the 516 recorded utterances were isolated calls. When there were vocal interactions, overlapping calls prevailed (63%), mostly involving adult males pant-hooting. Chimpanzees mostly produced calls in series, and the higher-ranked the caller, the faster the speed of call delivery. The social importance of consecutive calling was supported by a higher rate of audience reaction when the number of calls increased, suggesting strategic use of message redundancy. However, social integration, age, and sex weakly influenced call rates and interaction patterns. Although this study concerns a single study group, the rarity of turn-taking supports findings for wild chimpanzees. Why chimpanzees do not display this vocal behavior, which is commonly observed in primates, including other apes, is still puzzling.
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Dates et versions

hal-03512717 , version 1 (05-01-2022)

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Loïc Pougnault, Alban Lemasson, Baptiste Mulot, Florence Levrero. Temporal calling patterns of a captive group of chimpanzees (Pan troglodytes). International Journal of Primatology, 2021, 42 (6), pp.809-832. ⟨10.1007/s10764-021-00262-y⟩. ⟨hal-03512717⟩
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