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• W2295810432 abstract "Comparing vocalizations across species is useful for understanding acoustic variation at mechanistic and evolutionary levels. Here, we take advantage of the divergent vocalizations of two closely related howler monkey species ( Alouatta pigra and A. palliata ) to better understand vocal evolution. In addition to comparing multiple acoustic and temporal features of roars and the calling bouts in which they are produced, we tested several predictions. First, A. pigra should have roars with lower fundamental frequency and lower formant dispersion because they are larger than A. palliata and have a larger hyoid apparatus. Second, A. pigra should have faster calling rates, longer roars, longer bouts, and exaggerated call features linked to vocal effort (e.g., nonlinear phenomena and emphasized frequencies) because they are the more aggressive species during intergroup encounters. We found significant interspecific differences supporting our predictions in every tested parameter of roars and bouts, except for roar duration and barking rate. Stepwise discriminant function analyses identified the best features for differentiating roars (acoustic features: formant dispersion followed by highest frequency; temporal features: longest syllable duration followed by number of syllables). Although resembling each other more than they resemble South American howler monkeys, our comparison revealed striking differences in the vocalizations of the two Mesoamerican species. While we cannot completely rule out the influence of body size or the environmental conditions in which the two species evolved, vocal differences were likely influenced by sexual selection. The exaggerated roars and intense calling patterns in A. pigra seem more suitable for intergroup competition, whereas A. palliata calls may be better suited for mate attraction and competition within groups. With interspecific acoustic differences quantified, we will now be able to examine how vocalizations contribute to the evolutionary dynamics of the A. palliata × A. pigra hybrid zone in southern Mexico. Am. J. Primatol. 78:755–766, 2016. © 2016 Wiley Periodicals, Inc." @default.
• W2295810432 created "2016-06-24" @default.
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• W2295810432 date "2016-03-07" @default.
• W2295810432 modified "2023-10-16" @default.
• W2295810432 title "Striking differences in the loud calls of howler monkey sister species (<i>Alouatta pigra</i>and<i>A. palliata</i>)" @default.
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• W2295810432 doi "https://doi.org/10.1002/ajp.22539" @default.
• W2295810432 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26950654" @default.
• W2295810432 hasPublicationYear "2016" @default.
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