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The evolution of nonhuman primate loud calls: Acoustic adaptation for long-distance transmission

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Abstract

Many nonhuman primates produce species-typical loud calls used to communicate between and within groups over long distances. Given their observed spacing functions, primate loud calls are likely to show acoustic adaptations to increase their propagation over distance. Here we evaluate the hypothesis that primates emit loud calls at relatively low sound frequencies to minimize their attenuation. We tested this hypothesis within and between species. First, we compared the frequencies of loud calls produced by each species with those of other calls from their vocal repertoires. Second, we investigated the relationship between loud call frequency and home range size across a sample of primate species. Comparisons indicated that primates produce loud calls at lower frequencies than other calls within their vocal repertoires. In addition, a significant negative relationship exists between loud call frequency and home range size among species. The relationship between call frequency and range size holds after controlling for the potentially confounding effects of body size and phylogeny. These results are consistent with the hypothesis that nonhuman primates produce loud calls at relatively low frequencies to facilitate their transmission over long distances.

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    John C. Mitani & Jennifer Stuht

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Mitani, J.C., Stuht, J. The evolution of nonhuman primate loud calls: Acoustic adaptation for long-distance transmission. Primates 39, 171–182 (1998). https://doi.org/10.1007/BF02557729

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