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

Vietnam Primate Conservation Status Review Part 2: LEAF MONKEYS
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Distribution in Cambodia
Doucs may occur only east of the Mekong River (Corbet & Hill, 1992). Recent observations report the
occurrence of P. nigripes. Sightings of the species were obtained in Snuol Wildlife Sanctuary (J.
Walston, pers. comm., 2000), in southern Ratanakiri province (Timmins & Mey Soriyun, 1999) and
in northeastern and southern Mondulkiri Province close to Dak Lak Province border in Vietnam
(Long et al., 2000c.; Walston et al., 2001). The identification of P. nigripes by Long et al., 2000c was
supported by DNA analysis (C. Roos, pers. comm., 2000) conducted on two skin samples taken from
dead animals found in traps set for large carnivores.
One photo taken by Redford 1999 (unpubl.) in north-east Ratanakiri Province, close to the border of
Lao PDR and Vietnam (14 O 19’N/107 O 17’E) appears to be that of a Grey-shanked douc langur.
Distribution in Vietnam
The ranges of the three species are aligned from north to south in the following order: Red-, Grey- and
Black-shanked doucs. However, the data currently available about their distribution does not allow an
exact delineation of the boundaries among the species. There is also confusion in former observations
- the Grey-shanked form was first described only in 1997 - and hybrids are also known at some
locations. For this reason, the species inhabiting each locality is noted, as well as the diagnostic evidence.
Douc langurs are widely distributed from Nghe An Province to the Mekong Delta. They are very
scarce or absent in the largely deciduous forests of western Dak Lak and southern Gia Lai Provinces
and restricted to pockets of mixed evergreen forest. P. nemaeus is confirmed from 19 O 02’N (Pu Mat
National Park) to 14 O 33’N (Kon Ka Kinh Nature Reserve). P. nigripes is confirmed from 14 O 33’N (Kon
Ka Kinh Nature Reserve) to 11 O 26’N (Cat Tien National Park). P. cinerea occurs between the other
species; there are provisional reports of its occurrence from about 16 O N (Hien District, Quang Nam
Province) to 14 O 25’N (K’ Bang and Mang Yang Districts, Gia Lai Province), and confirmed reports from
15 O 25’N (Tien Phuoc District, Quang Nam Province) to 14 O 25’N (K’ Bang and Mang Yang Districts,
Gia Lai Province).
Knowledge about the range of the three species still requires clarification. Currently, no zoogeographic
boundaries can be determined with any precision. Although P. nemaeus is found as far south as the
northern Gia Lai Province, its occurrence between there and Da Nang Province has not been recorded.
Between the two areas, only P. cinerea is recorded. In the Mom Ray area (Kon Tum Province) nigripes
and nemaeus are provisionally reported. Hybrids may also inhabit the region. In the northern Gia Lai
Province (Kon Ka Kinh and Kong Cha Rang Nature Reserves), the three taxa live probably in close
proximity. In Kong Cha Rang Nature Reserve, P. nigripes has been provisionally reported and specimens
belonging to nemaeus have also been found. In Kon Ka Kinh Nature Reserve, even further south, only
P. nemaeus is reported. Furthermore, P. cinerea was reported to have been caught between Kong Cha
Rang and in Kon Ka Kinh Nature Reserves. Lippold (1995a,b) claimed that nemaeus and nigripes
were sympatric in the northern area of Gia Lai Province but this has not been confirmed.