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

Vietnam Primate Conservation Status Review Part 2: LEAF MONKEYS
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Ban Dao Son Tra Nature Reserve (DA NANG)
Special use forest: Nature reserve
Douc status: Occurrence confirmed, last evidence in 1995 (Lippold, 1995b)
Species recorded: P. nemaeus (sighting and specimen)
Several museum specimens of Red-shanked douc langurs were collected in this area. One male
foetus kept at the MNHN was collected in 1837 by J. F.T. Eydoux (reported from Da Nang vicinity). A
specimen, kept in the USNM is listed by Lippold (1977). One adult female skull (FCXM 002) was
collected in May 1984 (collector unknown). One female skin (FCXM unnumbered) was collected in
November 1989 (collector unknown).
Van Peenen et al. (1969) observed several groups from 200m a.s.l. to the top of Son Tra in September 1967.
Between May 1967 and May 1968, Gochfeld (1974) reported two groups of 5 and 6 individuals at an altitude
of 696m a.s.l. (Lippold, 1977). From June to August 1974, Lippold (1977) observed three groups of 8, 9 and
11 individuals. Pham Nhat (1994) saw one group of 10 individuals in August 1988 and one of 7 in December
1988. Lippold (1995b) reports two groups of 6 and 17 individuals between 1994 and 1995.
Son Tra has been visited many times by survey teams. It is the only place where a long-term douc field
survey has been conducted (Lippold, 1977, 1995). Although the forest still has scars left from the
defoliant sprayed during the American war and none of the forest remains undisturbed, douc langurs
continue to inhabit the area. Vu Ngoc Thanh (pers. comm.) estimates that only 3 groups of about 15
individuals each remain on the peninsula. It seems that the population is now very small or extirpated.
Pham Nhat did not observe any doucs during a visit in October 1998 (Pham Nhat, pers. comm.).
Hien District (QUANG NAM)
Special use forest: None
Douc status: Provisional occurrence, last report in 2000 (Ha Thang Long, 2000)
Species recorded: P. nemaeus (interview, specimen) P. cinerea (interview)
Grey-shanked douc langurs were recorded, based on interviews in May 1997 by Vu Ngoc Thanh and
Lippold (Vu Ngoc Thanh, pers. comm.). During a FZS survey conducted in 2000 it was found that most
of the locals and hunters know the two forms of doucs (Ha Thang Long, 2000). Grey-shanked doucs had
been frequently observed in the southern part, close to Nam Giang district while Red-shanked doucs
obviously occurred frequently in the northern part, close to Phu Loc District, Thua Thien-Hue Province.
It is quite likely that the borderline between the distribution of the Red-shanked and Grey-shanked
doucs runs roughly along the border of Quang Nam and Thua Thien-Hue Provinces.
There are also reports of the Grey-shanked douc langur close to the border with Lao PDR so, it is
quite likely that this species ranges into Lao PDR.
Song Thanh Nature Reserve and Nam Giang District (QUANG NAM)
Special use forest: Nature reserve
Douc Status: Occurrence confirmed, last evidence in 2000 (Ha Thang Long, 2000; Ngo Van Tri, in prep.)
Species recorded: P. nemaeus (interview), P. cinerea (interview, specimen and living animal)
Giao (1997) first listed P. nemaeus in the Song Thanh-Dak Pring area, but its occurrence remained
provisional until 2000. Furthermore, one local guide reported the occurrence of one group of P.
nemaeus in a forested area between Song Thanh NR and Ca Dy SFE in 1999. The presence of doucs
were also confirmed by the observation of 15 skulls found (without species identification) in Thanh