Abstract # 130:

Scheduled for Sunday, September 20, 2009 04:45 PM-04:55 PM: Session 13 (Del Mar Room) Oral Presentation


REVIEW OF WESTERN HOOLOCK GIBBON (HOOLOCK HOOLOCK) AND EASTERN HOOLOCK GIBBON (HOOLOCK LEUCONEDYS) DIVERSITY WITH A PRESENCE OF ANOTHER NEW DISTINCT VARIETY OF GIBBON IN ARUNACHAL PRADESH, INDIA.

J. Das1 and J. Biswas1,2
1Wildlife Areas Development and Welfare Trust, M.G. Road, Guwahati, Assam 781001, India, 2Primate Research Centre, Northeast Centre
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Till now we know two species of Gibbons, Western Hoolock Gibbon and Eastern Hoolock Gibbon from Arunachal Pradesh, India. But topology of the area and different large river systems which make permanent barriers for the probable presence of distinct variety of Hoolock Gibbon in that area. Survey was carried out in Lower Dibang Valley, Lohit, Anjao, Changlang, Tirap and parts of Dibang Valley districts only. General surveys of TEAM and Line transect method were followed in selected areas for the present survey. We covered 300 km of transect and recorded 380 in 123 groups. This study along with the inputs from China shows 3 distinct types of gibbons. Western Hoolock Gibbon (Hoolock hoolock) [n=154] from Tirap and Changlang district with uniform body colour of females, a sub species of Eastern Hoolock Gibbon (Hoolock leuconedys) [n=168] from Lohit district south of Lohit River with lighter hand colours of females and a third variety of Hoolock [n=58] from Dibang Valley, Lower Dibang Valley, Lohit and Anjao districts between Lohit and Dibang rivers with darker brown patches concentrated on the back of females only. All the 3 varieties are significantly different from each other. This has long term conservation implications for the species. Support : USFWS, Margot Marsh Biodiversity Foundation.