Vietnam Primate Conservation Status Review 2002 - Hoang Lien ...

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Vietnam Primate Conservation Status Review Part 2: LEAF MONKEYS 100 Ban Dan and Ban Phang villages, Muong Bang Commune, Mai Son District (SON LA) Grey langur was described but had not been seen for 6 years (interviews conducted during a FZS survey in 1999, L. Baker, pers. comm). Ban Puon village, Chieng Mai Commune, Mai Son District (SON LA) The last sighting was reported several years ago, and the species is probably now extinct in the area (interviews conducted during a FZS survey in 1999, L. Baker, pers. comm., 2000,). Ban Tam and Tu Buon villages, Chieng Ve Commune, Mai Son District (SON LA) The species is described but last sightings are reported 10 to 20 years ago (interviews conducted during a FZS survey in 1999, L. Baker, pers. comm., 2000). Discussed records Ky Thuong Nature Reserve (QUANG NINH) 21 O 05’-21 O 12’N/106 O 56’-107 O 13’E Grey langurs are reported in the investment plan of Ky Thuong Nature Reserve, Quang Ninh Province. A record so far to the east is questionable. During a visit to the reserve by BirdLife and FIPI in November 1999, seven informants claimed that no langurs occurred in the area (Tordoff et al., 2000b). However, a Dao hunter reported to have seen this species (“Vooc xam”) in 1959, though it is now extinct. Na Hang Nature Reserve (TUYEN QUANG) 22 O 16’-22 O 31’N/105 O 22’-105 O 29’E Grey langur is reported based on interviews by Dang Huy Huynh & Hoang Minh Khien (1993) and Boonratana (1999). This occurrence can be questioned. According to B. Martin (pers. comm. 2000), information provided by local people is confused and does not provide good evidence and it is likely that, if the species ever existed in Na Hang, it does not occur anymore. However, some areas in Na Hang are quite inaccessible and the fauna living in these places is still unknown. Du Gia Nature Reserve (HA GIANG) 22 O 49’-22 O 58’N/105 O 03’-105-11’E Grey langurs were reported in the investment plan to establish Du Gia Nature Reserve (Anon., 1994c). However, no references are given. Therefore this record is considered unreliable. Phong Quang Nature Reserve (HA GIANG) 22 O 50’-23 O 04’N/104 O 50’-105-01’E Grey langurs are reported in the investment plan for Phong Quang Nature Reserve (Anon., 1997b). However, no reference is given. Pa Co-Hang Kia Nature Reserve (HOA BINH) 20 O 41’-20 O 46’N/104 O 51’-105 O 01E Grey langurs are reported in the feasibility study for Pa Co-Hang Kia Nature Reserve (Anon., 1993c). However, no reference is given. Therefore, this record cannot be considered as reliable.
Ha Tay Province 20 O 34’-21 O 17’N / 105 O 18’-105 O 58’E 3.5 GREY LANGUR - Trachypithecus crepusculus Grey langurs were reported in Ha Tay Province in the Red Data Book of Vietnam (Ministry of Science, Technology and Environment, 1992). However, this location is given without reference. Regarding the extent of forest currently remaining in the province, it is doubtful that a significant population of the species still occurs. Thanh Son District (PHU THO) ca. 21 O 21’N / 104 O 59’E Grey langurs were reported in Thanh Son District (Phu Tho Province) by Dang Huy Huynh et al. (1994). However, no reference is given and the information cannot be considered as reliable. The species was not recorded during the FFI survey in Xuan Son Nature Reserve in November 1999 (Nguyen Xuan Dang & Lormée, 1999). Kon Cha Rang - Kon Ka Kinh area (GIA LAI) 14 O 09’-14 O 35’N/108 O 16’-108 O 39E The report of Grey langur in Kon Cha Rang-Kon Ka Kinh area by Lippold (1995b) is considered to be “incongruous” by Fooden (1996). This occurrence would be a considerable extension of T. crepusculus range to the south and there must be repeated sightings before it can be classified as confirmed. 3.5.5 Status Not enough data are available to assess correctly the Grey langur status in Vietnam. In fact, no surveys, however short, have been carried out with a special emphasis on this species. Grey langur is now very scarce and shy in Vietnam. In ten years, only five confirmed records have been documented, and there are only 12 localities with provisional occurrence. In China, the range of the species is restricted. In Honghe County it is extirpated from most places (Zhang et al., 1992). Ma et al. (1988) gave an estimation of 11,500 to 17,000 individuals. If this number was not overestimated, the population in China has dropped to 5,000-6,000 individuals (Wang Yingxiang et al. 1998). Zhang Yongzuo et al. (2002) estimate 5,400 individuals (of both taxa, shanicus and crepusculus). The subspecies shanicus occurs in three protected areas, the subspecies crepusculus in eight protected areas. No research on the species is planned at the moment in the country (Li Zhaoyuan, pers. comm., 2000). Despite its wide distribution in Lao PDR, there are less confirmed records of the Grey langur than of any other primate species. Although Nam Et, Phou Louey and Nam Ha NBCAs are located in its range, it has not been recorded, even provisionally. Its occurrence was recently confirmed in only three locations. Furthermore, it has not been found common in any surveyed area. It may be the most threatened primate in Lao PDR. It is locally considered “At Risk” (Duckworth et al., 1999). The major threat it currently faces is from hunting. Grey langur is heavily hunted throughout their range. This species often develops gallstones as large as golf balls, possibly due to drinking in the salt springs of mountainous areas. These “bezoar” stones are much sought-after by the Chinese for medicine production (Lekagul & McNeely, 1988). Indeed, although the species can live in a disturbed habitat, where it may even be found in higher densities (MacKinnon & MacKinnon, 1987), the hunting pressure is so great in northern Vietnam that its population can be considered to be on the way to extinction. Being a large prey, it is a prime target for hunters and, like other primates, it constitutes valuable merchandise for wildlife trading. 101
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Tilo Nadler - Frank Momberg - Nguye
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THE DESIGNATION OF GEOGRAPHICAL ENT
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iv 3.4 Delacour’s langur (Trachyp
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vi Acknowledgement Fauna & Flora In
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viii Abbreviations Key to abbreviat
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Red-shanked douc langurs; group of
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Vietnam Primate Conservation Status
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3 2 1 4 1. Indochinese Silvered lan
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3. Langurs
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3. Langurs 3.0 An introduction to t
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The basic social organisation for t
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3.1 Francois’ langur
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3.1 Francois’ langur Trachypithec
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DISTRIBUTION OF FRANCOIS' LANGUR (T
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3.1 FRANCOIS’ LANGUR - Trachypith
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Discussed records Quang Ninh Provin
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2 3 6 1 4 5 1. Hatinh langur; ad. m
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Page 52 and 53: Vietnam Primate Conservation Status
Page 58 and 59: 1 2 3 4 1. Cat Ba langur; ad. femal
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Page 73 and 74: 3.4 Delacour’s langur Trachypithe
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Page 77 and 78: 3.4.4 Delacour’s langur records 3
Page 83 and 84: Locations where Delacour’s langur
Page 85 and 86: 3.4.5 Status 3.4 DELACOUR’S LANGU
Page 87 and 88: 3.4.6 Recommendations for conservat
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Page 93 and 94: 3.5 Grey langur Trachypithecus crep
Page 95 and 96: Distribution in China 3.5 GREY LANG
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Page 101: Vu Quang National Park (HA TINH) Sp
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Page 109 and 110: 3.6 INDOCHINESE SILVERED LANGUR - T
Page 115 and 116: 4.0. Douc langurs
Page 117 and 118: 4. Douc langurs 4.0 An introduction
Page 119 and 120: 4 DOUC LANGURS Groups are character
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Page 129 and 130: 4 DOUC LANGURS Bach Ma National Par
Page 131 and 132: 4 DOUC LANGURS My Town and Ro Villa
Page 133 and 134: 4 DOUC LANGURS very poor secondary
Page 135 and 136: A Yun Pa Nature Reserve (GIA LAI) S
Page 137 and 138: Krong No District (DAK LAK) Special
Page 139 and 140: 4 DOUC LANGURS The Ra Glai minority
Page 141 and 142: Dinh Quan District (DONG NAI) Speci
Page 143 and 144: 4 DOUC LANGURS Obviously there are
Page 145: 4 DOUC LANGURS ✱ The establishmen
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DISTRIBUTION OF TONKIN SNUB-NOSED M
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5 2 3 1 4 6 1. Hunters with living
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7.0. Conservation Policy
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7. Conservation policy 7.1 Hunting
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The aims of an ex-situ programme sh
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7 CONSERVATION POLICY Table 7.4-1 R
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8. References 8 REFERENCES Adler, H
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8 REFERENCES Boonratana, R., and Le
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8 REFERENCES Dao Van Tien. 1970. Su
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8 REFERENCES Fooden, J. 1976a. Prov
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8 REFERENCES Hill, W. C. O. 1934. A
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8 REFERENCES Le Khac Quyet and Trin
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8 REFERENCES Lippold, L. K. 1995a.
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Monestrol, H. (ed.). 1952. Chasses
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8 REFERENCES Ngo Van Tri. 1999b. Th
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8 REFERENCES Pham Nhat, Nguyen Xuan
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8 REFERENCES Simonetta, A. 1957. Ca
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8 REFERENCES Vermeulen, J. and Whit
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Appendix 1 Leaf monkey species in t
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Appendix 2 Selected areas of high v
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8 APPENDIX: 2 the surrounding area
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8 APPENDIX: 2 Forests in the southe
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Ke Go Nature Reserve (HA TINH) Spec
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8 APPENDIX: 2 was decreed with a to
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8 APPENDIX: 2 Elevation: reaching 1
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8 APPENDIX: 2 regeneration of everg
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Appendix 3 IUCN RED LIST CATEGORIES
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EXTINCT (EX) A taxon is Extinct whe
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B Extent of occurrence estimated to
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D Population estimated to number le
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The Primate Conservation Status Rev
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