Geographical variation in orangutan long calls

R. Delgado, A. Lameira, Marina Davila-Ross, S. Husson, H. Morrogh-Bernard, S. Wich

Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)peer-review


Information on geographic variation in vocal signalling is important because it complements data used to infer phylogenetic relationships, has the potential to help understand call development, and may provide insights into social organization. A quantitative acoustic analysis of orangutan long calls was undertaken to compare males from six distinct sites across Borneo and Sumatra and revealed consistent differences among populations and between islands. Several acoustic parameters proved reliable for distinguishing among individuals, among sites, and between islands; populations differed significantly in the number of pulses per call, call speed, call duration, pulse duration and dominant frequency. The chapter discusses these findings in relation to proposed hypotheses that include the influence of ecological, genetic, and social factors. The findings suggest that the patterns of observed differences among orangutan populations are probably best explained by differences in either genetic characteristics and/or forest structure, but these hypotheses remain to be tested more rigorously.
Original languageEnglish
Title of host publicationOrangutans: geographic variation in behavioral ecology and conservation
EditorsS. Wich, S. Atmoko, T. Setia, C. Van Schaik
Place of PublicationNew York
PublisherOxford University Press
Number of pages10
ISBN (Print)9780199584154
Publication statusPublished - 2010


Dive into the research topics of 'Geographical variation in orangutan long calls'. Together they form a unique fingerprint.

Cite this