Hohmann G
Indian Institute of Science, Bangalore.
Folia Primatol (Basel). 1989;52(1-2):27-57. doi: 10.1159/000156380.
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 integration 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.
本文基于对野生群体的录音和行为观察，呈现了两种亚洲叶猴——尼尔吉里叶猴（Presbytis johnii）和南印度普通叶猴（Presbytis entellus）发声交流的对比数据。频谱分析显示，尼尔吉里叶猴有18种基本发声模式，普通叶猴有21种基本发声模式。这两种叶猴的发声模式库既包括结构离散的发声模式，其中物理参数的变化仅限于类内变异，也包括结构变异导致发声模式库不同部分之间整合的发声模式。群体扫描的定性评估表明，在这两个物种中，发声行为的特征都是在使用发声模式库的不同元素时存在明显的性别差异。对不同群体的普通叶猴现有数据的比较表明，在结构和行为层面都存在群体特异性的变化。此外，这两种亚洲叶猴发声系统的特征元素与非洲黑白疣猴所描述的特征元素有惊人的相似之处。
