The Conservation Status of Gibbons in Vietnam
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The Conservation Status of Gibbons in Vietnam The Conservation Status of Gibbons in Vietnam Benjamin M. Rawson, Paul Insua-Cao, Nguyen Manh Ha, Van Ngoc Thinh, Hoang Minh Duc, Simon Mahood, Thomas Geissmann and Christian Roos 2011 The Conservation Status of Gibbons in Vietnam Suggested citation: Rawson, B. M, Insua-Cao, P., Nguyen Manh Ha, Van Ngoc Thinh, Hoang Minh Duc, Mahood, S., Geissmann, T. and Roos, C. 2011. The Conservation Status of Gibbons in Vietnam. Fauna & Flora International/Conservation International, Hanoi, Vietnam Authors: Benjamin M. Rawson, Conservation International (CI) Paul Insua-Cao, Fauna & Flora International (FFI) Nguyen Manh Ha, Centre for Natural Resources and Environmental Studies (CRES) Van Ngoc Thinh, German Primate Centre (DPZ) Hoang Minh Duc, Institute of Tropical Biology, Vietnam Academy of Science and Technology Simon Mahood, Fauna & Flora International (FFI) Thomas Geissmann, Anthropological Institute, University Zurich-Irchel Christian Roos, German Primate Centre (DPZ) Species maps design: Mai Ky Vinh Published by: Fauna & Flora International Vietnam Programme 340, Nghi Tam, Hanoi, Vietnam Tel: +84 (0)4 3719 4117 Email: [email protected] Fauna & Flora International UK 4th Floor, Jupiter House, Station Road Cambridge, CB1 2JD, UK Tel: +44 (0) 1223 571000 Fax: +44 (0) 1223 461481 Email: [email protected] Web: www.fauna-flora.org Funded by: Arcus Foundation and Nowak-Sprague SE Asia Biodiversity Initiative Printed in Hanoi by: Phu Sy Printing ISBN: 9781903703298 All views expressed within are the authors’ alone unless attributed otherwise and do not necessarily reflect the opinion of Fauna & Flora International, Conservation International or the donors. While the authors and editors strive for rigour and accuracy in presenting this report, we make no representations as to completeness, suitability or validity of any information contained, and will not be liable for any errors or omissions. The designation of geographical entities in this document and the presentation of the materials, do not imply the expression on the part of the authors, editors and affiliated organisations concerning the delineation of frontiers and boundaries. The authors, editors and affiliated organisations take no responsibility for any misrepresentation of material that may result from the translation of this document into any other languages. Reproduction of any part of this report for educational, conservation and other non-profit purposes is authorised without prior permission from the copyright holder, provided that the source is fully acknowledged. Reproduction for commercial purposes is prohibited without prior written permission from the copyright holder. COPYRIGHT © 2011 Fauna & Flora International www.fauna-flora.org i Fauna & Flora International (FFI) Established in 1903 in the UK, FFI acts to conserve threatened species and ecosystems worldwide, choosing solutions that are sustainable, are based on sound science and take account of human needs. In 2000, FFI published a status review of gibbons in Vietnam and for over a decade has been actively involved in conserving Vietnam's most endangered gibbons. Primate conservation is a core area of interest for FFI's programme in Vietnam. Conservation International (CI) Founded in 1987, CI builds upon a strong foundation of science, partnership and field demonstration, to empower societies to responsibly and sustainably care for nature, our global biodiversity, for the well-being of humanity. CI has worked on field surveys, technical publications, capacity development and fund dispersal over the past four years to help conserve Vietnam’s threatened gibbons. IUCN/SSC Primate Specialist Group The Primate Specialist Group (PSG) is concerned with the conservation of more than 630 species and subspecies of prosimians, monkeys, and apes, carrying out conservation status assessments, the compilation of action plans, making recommendations on taxonomic issues, and publishing information on primates to inform IUCN policy as a whole. The PSG facilitates the exchange of critical information among primatologists and the professional conservation community. Arcus Foundation Founded in 2000 by Jon Stryker, the Arcus Foundation is a leading global foundation advancing pressing social justice and conservation issues. Through its programme for Great Apes in the Wild, Arcus works to ensure that viable populations of great apes are protected from extinction and living in habitats that are managed sustainably and holistically, as well as integrated with economic development objectives. Nowak-Sprague SE Asia Biodiversity Initiative The Nowak-Sprague SE Asia Biodiversity Initiative (NSSEABI) was created by the Nowak-Sprague family with the goal to preserve biodiversity and pristine places along with humanitarian goals in South-East Asia. The NSSEABI allocates grants to existing organizations, and has worked closely with Conservation International and Pathfinder International in Vietnam, focusing on primate conservation and human development projects. ii The Conservation Status of Gibbons in Vietnam Table of contents Acknowledgements.....................................................................................................................................................vi Conventions...................................................................................................................................................................vii Abbreviations and Acronyms....................................................................................................................................x Summary..........................................................................................................................................................................xi 1 Introduction ............................................................................................................................................................3 2 The Conservation Status of Gibbons in Vietnam .......................................................................................7 2.1 Gibbon Populations Trends ................................................................................................................................... 7 2.2 Protection Status for Vietnam’s Gibbons........................................................................................................... 9 2.3 Priority Sites for Gibbon Conservation in Vietnam.......................................................................................12 2.4 Overall Threats to Gibbons...................................................................................................................................14 2.5 Concluding Remarks...............................................................................................................................................17 3 Eastern Black Gibbon Nomascus nasutus .................................................................................................. 22 3.1 Global Status and Distribution............................................................................................................................22 3.2 Summary of Status and Distribution in Vietnam ..........................................................................................22 3.3 Nomascus nasutus Records in Vietnam ............................................................................................................23 3.4 Locations where Nomascus nasutus is Now Considered Absent.............................................................25 3.5 Sites with No New Data Since 2000...................................................................................................................26 4 Western Black Gibbon Nomascus concolor .............................................................................................. 30 4.1 Global Status and Distribution............................................................................................................................30 4.2 Summary of Status and Distribution in Vietnam ..........................................................................................31 4.3 Nomascus concolor Records in Vietnam...........................................................................................................32 4.4 Locations where Nomascus concolor is Now Considered Absent ...........................................................37 4.5 Sites with No New Data Since 2000...................................................................................................................37 5 Northern White-cheeked Gibbon Nomascus leucogenys .................................................................... 40 5.1 Global Status and Distribution............................................................................................................................40 5.2 Summary of Status and Distribution in Vietnam ..........................................................................................41 5.3 Nomascus leucogenys Records in Vietnam......................................................................................................42 5.4 Locations where Nomascus leucogenys is Now Considered Absent.......................................................51 5.5 Sites with No New Data Since 2000...................................................................................................................53 6 Southern White-cheeked Gibbon Nomascus siki ..................................................................................