Effects of proximity and behavioral context on acoustic variation in the coo calls of Japanese macaques
Article first published online: 16 MAY 2007
© 2007 Wiley-Liss, Inc.
American Journal of Primatology
Volume 69, Issue 12, pages 1412–1424, December 2007
How to Cite
Sugiura, H. (2007), Effects of proximity and behavioral context on acoustic variation in the coo calls of Japanese macaques. Am. J. Primatol., 69: 1412–1424. doi: 10.1002/ajp.20447
- Issue published online: 29 OCT 2007
- Article first published online: 16 MAY 2007
- Manuscript Accepted: 12 APR 2007
- Manuscript Revised: 20 FEB 2007
- Manuscript Received: 20 NOV 2006
- acoustic feature;
- behavioral context;
Acoustic features of coo calls in Japanese macaques (Macaca fuscata) show large and graded variation. To explore the relevance of acoustic variation in coo calls, I examined whether acoustic features differed by the caller's activity and proximity to group members. The subjects were five adult females from a wild, habituated group of Japanese macaques consisting of 23 individuals. Coo calls from the five females were recorded with their activity and proximity to group members. Acoustic features of 280 calls were measured with a sound spectrograph. Some of the acoustic variables differed by proximity but not by activity. The callers produced coo calls with larger frequency modulation and longer duration when they were far from group members compared to when they were near another member. The results suggest that Japanese macaques produce calls with more detectable and locatable features depending on the proximity to group members. Am. J. Primatol. 69:1412–1424, 2007. © 2007 Wiley-Liss, Inc.