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" The capped langur (Prebytis pileata) in Bangladesh; ecology and social behavior of a primate living in one-male groups "
C. B. Stanford
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Latin Dissertation
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| Language of Document
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English
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| Record Number
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1112739
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| Doc. No
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TLpq303670501
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| Main Entry
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C. B. Stanford
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| Title & Author
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The capped langur (Prebytis pileata) in Bangladesh; ecology and social behavior of a primate living in one-male groups\ C. B. Stanford
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| College
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University of California, Berkeley
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| Date
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1989
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| student score
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1989
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| Degree
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Ph.D.
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| Page No
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301
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| Abstract
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Between 1986 and 1988, I conducted a 15-month field study of the capped langur (Presbytis pileata) in Bangladesh. Approximately 1400 hours of observational data on social behavior and ecology were collected at Madhupur National Park in north-central Bangladesh. The study site at Madhupur was a moist deciduous sal forest, with 35 tree species recorded. Capped langurs occurred at a density of 53 individuals/km2. Average group size was 8.5, and all two-sex groups were one-male. A small number of lone males and all-male bands were also observed. Five study groups occupied home ranges with virtually complete overlap. The home range of main study group was 21.6 hectares during the study period. The mean day range of the main study group over 12 months was 324.5 meters. One-male groups were led by adult females, who determined the timing and direction of travel. No territorial defense nor defense of food resources was observed, and intergroup encounters between familiar one-male groups were non-aggressive and casual. Encounters between the main study group and unfamiliar one-male groups was marked by a significantly greater number of male displays and an increased level of intergroup tension. Encounters between one-male group and extra-group males were always aggressive. During these encounters the resident male vigilantly prevented his females from approaching the extra-group male, sometimes biting and pushing them back to his group. Both males and females dispersed. Males appeared to disperse from their natal groups at maturity, while three females that transferred into study groups were parous adults. Extra-group males were observed to pair with extra-group females. The capped langur diet, by percentage of scans spent feeding, was comprised of 42% mature leaves, 11% leaf flush, 24% fruit, 8% seeds, 7% flowers and 1.5% other, including arthropods and soil. There was a marked seasonality in diet, and during the May through September monsoon the diet was 50% fruit. Although mature leaves were the dietary staple, the animals preferred leaf flush and fruit and switched to this diet when it was available. During the monsoon the animals also ranged furthest and fed most diversely. The lack of territoriality combined with the observed social strategies of females and males are discussed in light of current theories of primate social systems.
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| Subject
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Biological sciences
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langur
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Physical anthropology
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Social sciences
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Zoology
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