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Comparative Study of Vocal Communication in Two Asian Leaf Monkeys, Presbytis johnii and Presbytis entellus

Hohmann, G (1989) Comparative Study of Vocal Communication in Two Asian Leaf Monkeys, Presbytis johnii and Presbytis entellus. In: Folia Primatologica, 52 (1-2). pp. 27-57.

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Abstract

This paper presents comparative data on the vocal communication of two Asian leaf monkeys, the Nilgiri langur (Presbytis johnii) and South Indian common langur (Presbytis entellus), based on sound recordings and behavioural observations of free-ranging groups. Spectrographical analyses revealed a repertoire of 18 basic patterns for Nilgiri langurs, and 21 basic patterns for common langurs. The repertoires of the two langur species consist of both discretely structured vocal patterns, in which alterations of the physical parameters are restricted to intra-class variation, and those in which structural variations cause intergradation between different sections of the repertoire. Qualitative assessments of group scans indicate that in both species vocal behaviour is characterized by pronounced sex-differences in the use of the different elements of the vocal repertoire. Comparison of data available from different populations of P. entellus suggests population-specific modifications on both structural and behavioural levels. Moreover, characteristic elements of the vocal systems of the two Asian species demonstrate striking similarities to those described for the African black-and-white colobus.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to S. Karger AG.
Keywords: Colobinae;Nilgiri langur;Presbytis johnii;Common langur;Presbytis entellus;Vocal repertoire;Vocal behaviour.
Department/Centre: Others
Date Deposited: 05 Aug 2010 05:32
Last Modified: 05 Aug 2010 05:32
URI: http://eprints.iisc.ernet.in/id/eprint/31137

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