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2 - Conservation Status of the Northern Yellow-Cheeked Crested Gibbon (Nomascus annamensis) in Vietnam

An Update

Published online by Cambridge University Press:  13 April 2023

By
Duc Minh Hoang ,
Bang Van Tran ,
Chuong Van Hoang  and
Herbert H. Covert
Edited by
Susan M. Cheyne ,
Carolyn Thompson ,
Peng-Fei Fan  and
Helen J. Chatterjee
Susan M. Cheyne
Affiliation:
Borneo Nature Foundation
Carolyn Thompson
Affiliation:
University College London
Peng-Fei Fan
Affiliation:
Sun Yat-Sen University, China
Helen J. Chatterjee
Affiliation:
University College London
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Summary

We review the results of recent surveys for the northern yellow-cheeked crested gibbon (Nomascus annamensis) on the eastern slope of the Annamite Range in Binh Dinh and Quang Ngai provinces, and update its conservation status in Vietnam. Surveys were conducted in three adjacent forest blocks: West Ba To Proposed Nature Reserve (NR), An Toan NR and Vinh Son Commune, with a total area of 367 km2. We documented gibbon densities of 0.41 and 0.15 groups/km2 in the first two sites but did not find any groups in the third location. We detected 46 groups and estimated 114 groups in these areas, about 14 per cent of Vietnam’s known population of N. annamensis. Our archival study revealed that at least 317 groups of this species have been confirmed in Vietnam. The distribution range is between approximately 14° 00′ and 16° 50′ N latitude with potential overlap with the southern white-cheeked gibbon in the northernmost portion of this range. Important drivers influencing the distribution of the species in Vietnam include temperature seasonality, elevation, precipitation of the driest month, annual precipitation, and precipitation of driest quarter. This species faces extinction in Vietnam due to fragmented habitat, small subpopulation sizes, illegal hunting and forest conversion.

Keywords

conservation statuspopulation sizehabitatgibbonsHylobatidae
Type
Chapter
Information
Gibbon Conservation in the Anthropocene , pp. 24 - 39
Publisher: Cambridge University Press
Print publication year: 2023

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