Vocal sequential exchanges and intragroup spacing in the Northern Muriqui Brachyteles arachnoides hypoxanthus

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Auteur principal: Mendes, Francisco Dyonísio Cardoso
Date de publication: 2004
Autres auteurs: Ades, César
Format: Article
Langue: eng
Source: Repositório Institucional da UnB
Download full: http://repositorio.unb.br/handle/10482/6006
https://dx.doi.org/10.1590/S0001-37652004000200032
Résumé: ABSTRACT: Sequential exchanges of vocalizations (staccatos and neighs) emitted by Northern Muriquis Brachyteles arachnoides hypoxanthus were recorded at the Biological Station of Caratinga, Minas Gerais State, Brazil. Staccatos and neighs containing larger proportion of short elements were preferentially produced during short-range exchanges; neighs, produced by a larger number of participants, were typical of long-range exchanges. Staccatos emitted by animals feeding in a dispersed manner contained a larger proportion of tonal elements than those emitted by muriquis feeding in a cohesive manner. Sequential exchanges seem thus to be constituted by two inter-related subsystems of calls that aid muriquis to coordinate intragroup spacing, despite the poor visibility of the habitat.

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