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

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1 2 5 3 4 1. Red-shanked douc langur; ad. male. T. Nadler 2. Black-shanked douc langur; ad. male. T. Nadler 3. Grey-shanked douc langur; ad. male. T. Nadler 4. Red-shanked douc langur; infant male, nine month old. T. Nadler 5. Red-shanked douc langur; ad. male. T. Nadler
4. Douc langurs 4.0 An introduction to the douc langurs (genus: Pygathrix) 4.0.1 Taxonomy 4 DOUC LANGURS Four Asian colobine genera: Pygathrix, Rhinopithecus, Nasalis and Simias with special nasal pecularities and a high intermembral index are usually combined in the “Odd-Nosed Group”. Taxa currently recognised as belonging to Pygathrix were placed under several other genera until Pocock’s (1934) revision of genus-level taxonomy. This name was given by Geoffroy St. Hillaire (1812). The Red-shanked douc langur, Pygathrix nemaeus, from northern <strong>Vietnam</strong> and Lao PDR was described by Linnaeus in 1771. Milne-Edwards (1871) described the southern form, the Black-shanked douc langur, Pygathrix nigripes. Kloss (1926), Pocock (1934) and many subsequent reviewers (Napier, 1985; Groves, 1970; Corbet & Hill, 1992; Davies & Oates, 1994; Jablonski, 1995, 1998) considered P. nigripes a subspecies of P. nemaeus. Brandon-Jones (1984) recognised two species, based mainly on colouration and zoogeographic distribution. It was not until 1997 that a third taxa was decribed, as a subspecies of the Red-shanked douc langur P. nemaues cinereus (Nadler, 1997a). The Latin adjectival subspecific name cinereus should be altered to cinera so that its suffix agrees in feminine gender with the generic name Pygathrix (Timmins & Duckworth 1999). Recent studies of genetics (Roos & Nadler, 2001) show a divergence on species level, and craniometric studies show that significant differences exist between the three forms (Harding & Groves, 2001). Groves (2001) recognizes the three forms as distinct species. However, hybrids are known between Red- and Grey-shanked doucs and between Grey- and Blackshanked doucs. Lippold & Vu Ngoc Thanh (1995b) described observations of animals with intermediate colouration and Nadler (1995b) described museum specimens which also most probably are hybrids. Another form of douc langur, was described as P. nemaeus moi by Kloss (1926), on the basis of two males, three females and two juveniles from Nui Ba (=Nui Lang Bian) and of two males collected in Don Duong (=Dran) in Lam Dong Province. Kloss observed that these specimens showed a reduction in the extent of black area compared with the nigripes from southern <strong>Vietnam</strong>. Examinations of the skin described as moi by Kloss shows that his original description does not adequately represent the variation observed in pelage colouration of nigripes (Thomas, 1928, Jablonsky, 1995). Most authors regard moi as a synonym of nigripes (Groves, 1970; Napier, 1985; Weitzel et al., 1988; Jablonski, 1995;), a view which is now supported by DNA investigation (see 2.3). 4.0.2 Morphology, ecology and behaviour Douc langurs are large colobines and, compared to the langurs, the body appears more heavy and clumsy. The arms are only slightly shorter than the legs. The tail length is approximately equal to the head/body length. The head has no crest on crown, the hairs are smoothly directed backwards and form a short cape over the neck. The nose is flat, not upturned but little flaps of skin partially cover the nares from the distalexternam margin. The eyes appear almond-shaped and are set at a slightly inclined angle, the lateral aspect of the eye being slightly higher than the medial. The eye shape imparts an Asiatic expression to the douc’s face. 115
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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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1 2 3 4 1. Cat Ba langur; ad. femal
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Page 66 and 67: Vietnam Primate Conservation Status
Page 71 and 72: 3.4. Delacour’s langur
Page 73 and 74: 3.4 Delacour’s langur Trachypithe
Page 75 and 76: 3.4 DELACOUR’S LANGUR - Trachypit
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
Page 91 and 92: 3.5. Grey langur
Page 93 and 94: 3.5 Grey langur Trachypithecus crep
Page 95 and 96: Distribution in China 3.5 GREY LANG
Page 97 and 98: 3.5 GREY LANGUR - Trachypithecus cr
Page 99 and 100: 3.5 GREY LANGUR - Trachypithecus cr
Page 101 and 102: Vu Quang National Park (HA TINH) Sp
Page 103 and 104: Ha Tay Province 20 O 34’-21 O 17
Page 105 and 106: 3.6. Indochinese Silvered langur
Page 107 and 108: 3.6 Indochinese Silvered langur Tra
Page 109 and 110: 3.6 INDOCHINESE SILVERED LANGUR - T
Page 115: 4.0. Douc langurs
Page 119 and 120: 4 DOUC LANGURS Groups are character
Page 121 and 122: 4.1.2 Black-shanked douc langur Pyg
Page 123 and 124: 4 DOUC LANGURS DISTRIBUTION OF RED-
Page 125 and 126: 4 DOUC LANGURS DISTRIBUTION OF BLAC
Page 127 and 128: 4 DOUC LANGURS One infant skull (IE
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
Page 148 and 149: 2 3 1 1. Tonkin snub-nosed monkey;
Page 152 and 153: 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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