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

Vietnam Primate Conservation Status Review Part 2: LEAF MONKEYS
36
Pong 1 Village (Le Xuan Canh et al., 2000). The location of capture of this animal was not given so the
record remains provisional, although it is likely that it came from the adjacent limestone area of Ham
Yen District. The animal died and was taken to the IEBR museum. Following interviews Long & Le
Khac Quyet (2001) noted approximately three to four groups each numbering five to six animals in
the area around Luong Pang. One brief sighting close to Dan Khao village, Phu Luu commune, likely
represents this species but the sighting was not clear.
T. francoisi was described as common five years ago in Dan Khao, but severe hunting pressure has led
its extirpation in some forest areas and population reduction in others (Long & Le Khac Quyet, 2001).
Nguyen Binh, Thach An and Bao Lam Districts (CAO BANG)
Special use forest: None
Francois’ langur status: Provisional occurrence, last report in 2001 (interview), (Trinh Dinh Hoang,
2001; Le Khac Quyet & La Quang Trung, 2001)
Based on interview data a FFI primate survey of Cao Bang Province conducted in February/March
2001, indicated there may be some populations of the species in these districts. Further reports from
Nguyen Binh District were obtained later in 2001 (Trinh Dinh Hoang, 2001). Most local informants in
all three districts described a “Vuon duoi dai” or monkey with long tail, or refered to the “Khi khan
quang” (white scarf around the neck). Furthermore, one skin was found in a household in Phieng
Phat Village, Quang Lam Commune, Bao Lam District. Apparently the owner had shot the animal in
1999 near Du Gia Nature Reserve (Ha Giang) and reported that there are around 7-10 remaining
individuals (Le Khac Quyet & La Quang Trung, 2001).
This new information confirmed the importance of the Du Gia NR and, in particular, the forest
between the NR and Bao Lam District, Cao Bang Province. This forest may support a population of
10-20 individuals (Le Khac Quyet & La Quang Trung, 2001).
Interviews in Ha Lang District suggested that the species has been extripated from this area (La
Quang Trung, 2001).
Ba Be National Park and proposed extension (BAC KAN)
Special use forest: National park
Francois’ langur status: Occurrence confirmed, last evidence in 1999 (Nong The Dien, pers. comm. 2000)
In January 1927, Francois’ langurs were observed by J. Delacour and W. P. Lowe (Lowe, 1947) in the
vicinity of Ba Be lake. One female adult skull (ZMVNU 112) was collected in August 1967 by Truong Van
La. One juvenile skull (ZMVNU 111, sex unknown) was collected by Le Ba Thai in August 1967 and was
reported from Po Lu, Nam Mau Commune. Three skulls (male and two females, ZMVNU 128/3.120.26Ps,
87/3.35.11 and 113) were collected in March 1961 and February 1967 (collector unknown) in Ban Vai,
Khang Ninh Commune. Two adult male skulls (ZMVNU 109 and 542) and one adult female skull (ZMVNU
110) were collected in July 1967 by Mr. Ha in the same locality. One juvenile skull (ZMVNU 117) was
collected in March 1971 by Nguyen Van Chau in Nam Cuong Commune. One male skin (ZMVNU
unnumbered) was collected by Vi Nguyen Thuyet in April 1983 in Ban Vai village (Fooden, 1996).
Information about the Francois’ langur was obtained by Ratajszczak et al. (1990) in 1989. The team
found the skin and skull of an animal shot in August 1989 near Dan Dang village (northwest of the
park). Informants from this locality reported that a small group lived near their village, but was rarely
seen. Other groups were also reported on the western shore of the central channel of the lake and in
Dong Puong (=Puong Grotto) (northeast of the park).