Vocalization patterns of two groups of captive Francois' langurs (Presbytis
francoisi) were studied between August 1989 and June 1990. During the 11
months of observation, 109 hours of vocalization recordings were made at Metro
Washington Park Zoo, Portland, and the San Diego Zoo, San Diego. Based on the
behavioral observations and the vocalization recordings, two categories of
vocalization types are described. Type I consists of 20 basic patterns including
infant vocalizations and a vocalization recorded by other observers. Type II
consists of 3 patterns related to stereotypic behavior and possible stress under
captive conditions. Physical characteristics and the context of behavior for each
call type are described. Spectrograms are given for all call types except the loud
call. Among the calls recorded, whistle vocalizations of infants are the longest in
duration.
Comparison of vocalization patterns of P. francoisi to those of other species
of the genus Presbytis revealed similarities in behavior and context among some
call types in the species of P. entellus and P. johnii. / Graduation date: 1992
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/36569 |
| Date | 04 December 1991 |
| Creators | Krishnamurthy, Ramesh S. (Ramesh Saligrama), 1964- |
| Contributors | Hall, Roberta |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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