cross-taxa similarities in affect-induced changes of vocal behavior and voice in arboreal monkeyscross-taxa相似之处affect-induced声音的变化行为和声音在栖息在树上的猴子.pdf

Cross-Taxa Similarities in Affect-Induced Changes of Vocal Behavior and Voice in Arboreal Monkeys 1,2 1 1 3 Alban Lemasson *, Kevin Remeuf , Arnaud Rossard , Elke Zimmermann ´ 1 Universite de Rennes 1, Ethologie animale et humaine, UMR 6552 – CNRS, Station Biologique de Paimpont, Paimpont, France, 2 Institut Universitaire de France, Paris, France, 3 Institute of Zoology, University of Veterinary Medicine Hannover, Hannover, Germany Abstract Measuring the affective state of an individual across species with comparable non-invasive methods is a current challenge in animal communication research. This study aims to explore to which extent affect intensity is conveyed in the vocal behaviours of three nonhuman primate species (Campbell’s monkeys, De Brazza’s monkeys, red-capped mangabeys), which vary in body size, ecological niche and social system. Similarly in the three species, we experimentally induced a change in captive social groups’ affect by locking all group members together in their outside enclosure. The two experimental conditions which varied in affect intensity consisted in imposing a pre-reunion 90 mn-separation by splitting up the respective group into two subgroups (High affect condition) or not (Low affect condition). We measured call rates as well as voice features at the time of reunion in both conditions. The three studied species reacted in a very similar way. Across species, call rates changed significantly between the behaviourally defined states. Furthermore, contact call duration and, to some extent, voice pitch increased. Our results suggest, for the first time in arboreal Old World monkeys, that affect intensity is conveyed reliably in vocal behaviour and specific acoustic character