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High dietary diversity supports large group size in Indo-Chinese gray langurs in Wuliangshan, Yunnan, China
American journal of primatology, 2015-05, Vol.77 (5), p.479-491
Pengfei, Fan
Garber, Paul
Chi, Ma
Guopeng, Ren
Changming, Liu
Xiaoyong, Chen
Junxing, Yang
2015
Volltextzugriff (PDF)
Details
Autor(en) / Beteiligte
Pengfei, Fan
Garber, Paul
Chi, Ma
Guopeng, Ren
Changming, Liu
Xiaoyong, Chen
Junxing, Yang
Titel
High dietary diversity supports large group size in Indo-Chinese gray langurs in Wuliangshan, Yunnan, China
Ist Teil von
American journal of primatology, 2015-05, Vol.77 (5), p.479-491
Ort / Verlag
United States: Blackwell Publishing Ltd
Erscheinungsjahr
2015
Quelle
Wiley-Blackwell Journals
Beschreibungen/Notizen
Identifying ecological factors underlying primate group size has been a central theme in primate behavioral ecology. The ecological constraints model proposes that increased group size leads to enhanced within‐group feeding competition, necessitating increased travel to encounter additional or more productive feeding sites. Over the course of three years, we studied the largest known group (>80 individuals) of Trachypithecus crepusculus (Indo‐Chinese gray langur) for 1738 hours during 213 days (including 96 full day follows) in Wuliangshan, China. During this period, group size increased from 81 individuals to over 90 individuals. The group consumed plant parts from 27 ± 8 (range: 15–51) species per month, and a total 148 plant species during the study. Based on time spent feeding, the diet was similar (54.2% leaves and 32.1% fruit and seeds) to that reported for other colobines. Despite occupying a home range several times larger than other groups of Trachypithecus, we found no evidence of an increase in daily path length with increasing group size, and the group's time budget and daily path length remained relatively constant despite marked monthly changes in dietary pattern (e.g. time spent exploiting fruit and seeds vs. buds and young leaves, vs. mature leaves). These results are inconsistent with many of the predictions of the ecological constraints model. Rather, our data suggest that high dietary diversity and the ability to exploit difficult to digest foods enabled Indo–Chinese gray langurs to reduce opportunities for feeding competition associated with increased group size. Am. J. Primatol. 77:479–491, 2015. © 2014 Wiley Periodicals, Inc.
Sprache
Englisch
Identifikatoren
ISSN: 0275-2565
eISSN: 1098-2345
DOI: 10.1002/ajp.22361
Titel-ID: cdi_proquest_miscellaneous_1680437009
Format
–
Schlagworte
Animals
,
Cercopithecidae - physiology
,
China
,
Diet
,
ecological constraints model
,
Ecosystem
,
Feeding
,
Feeding Behavior
,
Flora
,
food competition
,
Fruit
,
Group size
,
Homing Behavior
,
Indo-Chinese gray langur
,
Plant Leaves
,
Population Dynamics
,
Primate behaviour
,
Primatology
,
Seeds
,
Social Behavior
,
Species
,
Wuliangshan
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