Sex differences in the acoustic structure of terrestrial alarm calls in vervet monkeys (Chlorocebus pygerythrus).

Autor: Dubreuil C; Department of Anthropology and Archaeology, University of Calgary, Calgary, Alberta, Canada.; Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton, UK.; Department of Psychology, University of Lethbridge, Lethbridge, Alberta, Canada., Notman H; Department of Anthropology and Archaeology, University of Calgary, Calgary, Alberta, Canada.; Department of Anthropology, Athabasca University, Athabasca, Alberta, Canada., Barrett L; Department of Psychology, University of Lethbridge, Lethbridge, Alberta, Canada.; Applied Behavioural Ecology and Ecosystems Research Unit, University of South Africa, Gauteng, South Africa., Henzi P; Department of Psychology, University of Lethbridge, Lethbridge, Alberta, Canada.; Applied Behavioural Ecology and Ecosystems Research Unit, University of South Africa, Gauteng, South Africa., Pavelka MSM; Department of Anthropology and Archaeology, University of Calgary, Calgary, Alberta, Canada.
Jazyk: angličtina
Zdroj: American journal of primatology [Am J Primatol] 2024 Aug 20, pp. e23674. Date of Electronic Publication: 2024 Aug 20.
DOI: 10.1002/ajp.23674
Abstrakt: The alarm calls of vervet monkeys (Chlorocebus pygerythrus) have been the subject of considerable focus by researchers, owing primarily to the purported referential qualities of different alarm call types. With this focus on reference, acoustic variation among calls elicited by the same range of predators has typically been overlooked. Specifically, at least one type of alarm call-the terrestrial alarm-was described over 50 years ago as being acoustically distinct between males and females-a description that has largely eluded more systematic scrutiny. Here, we provide a quantitative acoustic analysis and comparison of terrestrial alarm calls produced by adult male and female vervet monkeys. We use a random forest model to determine which acoustic variables best distinguish between the calls of males and females, and use an unsupervised clustering technique to objectively determine whether alarms produced by each sex fall into discrete types. We found that the calls of males and females differed most in frequency-based parameters, with male alarms containing more energy at lower frequencies relative to females. Calls produced by males were also of longer duration, and consisted of longer individual call elements relative to female calls. While calls generally fell into clusters associated with either male or female alarms, we found that some fell into atypical clusters given the caller's sex, and that the clusters themselves showed evidence of intergradation. We discuss these results in terms of potential differences in the function of, and motivation for, calling by males and females. We emphasize the need for a more holistic approach to the classification of vocal signals that considers contextual, functional, and structural variation.
(© 2024 The Author(s). American Journal of Primatology published by Wiley Periodicals LLC.)
Databáze: MEDLINE
Externí odkaz: