Primates in Peril

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Nadler, T. 2012. Reintroduction of the ‘Critically Endangered’ Delacour’s langur (Trachypithecus delacouri) – preliminary report. Vietnamese Journal of Primatology 2: 67–72. Nadler, T., Le Trong Dat and Luong Van Hao. 2004. A Primate Field survey at Pu Luong Nature Reserve with the Emphasis on Delacour’s langur (Trachypithecus delacouri). Fauna and Flora International–Vietnam Conservation Support Programme and Forest Protection Department and Frankfurt Zoological Society, Hanoi. Nadler, T. (2015): Draft for a National Action Plan for the ‘Critically Endangered’ Delacour’s langur (Trachypithecus delacouri). Unpublished report. Nadler, T., F. Momberg, Nguyen Xuan Dang and N. Lormee (eds.). 2003. Vietnam Primate Conservation Status Review 2002. Part 2: Leaf Monkeys. Fauna and Flora International and Frankfurt Zoological Society, Hanoi. Nadler, T., Le Xuan Canh, Van Ngoc Thanh and Le Khac Quyet. 2008. Trachypithecus delacouri. In: IUCN Red List of Threatened Species. Version 2015-3. . Downloaded on 22 September 2015. Ratajszczak, R. R. Cox and Ha Dinh Duc. 1990. A Preliminary Survey of Primates in North Vietnam. Report, World Wide Fund for Nature, Gland, Switzerland. 55
Golden-headed or Cat Ba Langur Trachypithecus poliocephalus poliocephalus (Trouessart, 1911) Vietnam (2000, 2002, 2004, 2006, 2008, 2010, 2012, 2014) Neahga Leonard, Richard J. Passaro, Daniela Schrudde, Roswitha Stenke, Phan Duy Thuc & Martina Raffel Golden-headed or Cat Ba langur (Trachypithecus poliocephalus poliocephalus) (Illustration: Stephen D. Nash) The Cat Ba langur (previously known as the goldenheaded langur), Trachypithecus p. poliocephalus, is probably the most endangered of the Asian colobines, and is assessed as Critically Endangered (Bleisch et al. 2008). This species occurs only on Cat Ba Island, an island in the Gulf of Tonkin off the northeastern Vietnamese shore (Stenke and Chu Xuan Canh 2004). The Cat Ba Archipelago is adjacent to the world-famous Ha Long Bay, a spectacular karst formation that was invaded by the sea following the last major glaciation. The favoured habitat of the Cat Ba langur is tropical moist forest on limestone karst hills, a habitat preference it shares with the other six to seven taxa of the T. francoisi group. While there are no systematic and reliable data available on the historic density of the langur population on Cat Ba Island, reports by indigenous people suggest the entire island of Cat Ba (140 km²) and some smaller offshore islands were previously densely populated by langurs. Hunting has been identified as the sole cause for the dramatic and rapid population decline from an estimated 2,400-2,700 in the 1960s to approximately 50 individuals by 2000 (Nadler and Long 2000). The 56 langurs were poached mainly for trade in traditional medicines and for sport. Since the implementation of strict protection measures in 2000, the langur population on Cat Ba Island has stabilized (Nadler et al. 2003) and since 2003 has been on the increase (N. Leonard, Cat Ba Langur Conservation Program Project Manager, pers. obs.). Although the growth of the population is encouraging, the overall status of the species remains critical and the total population worryingly small. Habitat fragmentation and hunting has divided the remaining population into several isolated sub-populations some of which consist of all-female, non-reproducing social units. The total reproductive output of this species over the years has been low due to the small population and the long inter-birth cycle, but records indicate that the birth rate is increasing and 2014 and the first half of 2015 saw a substantial jump in birth rates with 16 babies being born in 18 months (N. Leonard pers. comm.). In 2012, after many years of planning and preparation,
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Primates in Peril: The World’s 25
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Contents Acknowledgements..........
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The World’s 25 Most Endangered Pr
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Table 2. Primate species included o
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Page 16 and 17: Rondo Dwarf Galago Galagoides rondo
Page 18 and 19: A new project to address these cons
Page 20 and 21: potential and roloways have been re
Page 22 and 23: Preuss’s Red Colobus Piliocolobus
Page 24 and 25: Groves, C. P. 2007. The taxonomic d
Page 26 and 27: There are six (perhaps seven) other
Page 28 and 29: Grauer’s Gorilla Gorilla beringei
Page 30 and 31: (WCS unpublished data), is encourag
Page 32 and 33: Lavasoa Mountains Dwarf Lemur Cheir
Page 34 and 35: Hapke, A., J. Fietz, S. D. Nash, D.
Page 36 and 37: of hunting and trapping are employe
Page 38 and 39: Red Ruffed Lemur Varecia rubra É.
Page 40 and 41: Rigamonti, M. M. 1993. Home range a
Page 42 and 43: In 2008, the Service d’Appui à l
Page 44 and 45: km 2 ) in Banks et al. (2007), for
Page 46 and 47: Salmona, J., R. Heller, E. Quémér
Page 48 and 49: Philippine Tarsier Carlito syrichta
Page 50 and 51: Javan Slow Loris Nycticebus javanic
Page 52 and 53: Moore et al. (2014) assessed the su
Page 54 and 55: Thorn, J. S., V. Nijman, D. Smith,
Page 56 and 57: peat-swamp forests, S. c. siberu ha
Page 58 and 59: Delacour’s Langur Trachypithecus
Page 62 and 63: one group consisting of two females
Page 64 and 65: and gunshots were recorded commonly
Page 66 and 67: ut do occur. Aggression is quite ra
Page 68 and 69: Western Purple-faced Langur Semnopi
Page 70 and 71: in the community and in nearby town
Page 72 and 73: Hainan Gibbon Nomascus hainanus (Th
Page 74 and 75: hainanus and the Eastern black gibb
Page 76 and 77: equire vast areas of contiguous rai
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Page 80 and 81: is relatively well preserved and pr
Page 82 and 83: Province, and adjacent regions of I
Page 84 and 85: Due to the threats of habitat loss
Page 86 and 87: San Martín Titi Monkey Callicebus
Page 88 and 89: Northern Brown Howler Alouatta guar
Page 90 and 91: References Brazil, MMA, ICMBio-CPB.
Page 92 and 93: Editors’ addresses Mittermeier, R
Page 94 and 95: Louis, Jr., Edward E. Omaha’s Hen
Page 96 and 97: Vermeer, Jan Proyecto Mono Tocón,
Page 98: The Species Survival Commission (SS
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