PART 1:
GIBBONS
THOMAS GEISSMANN, NGUYEN XUAN DANG,
NICOLAS LORMÉE & FRANK MOMBERG
The Primate Conservation Status Review, Vietnam 2000 contains alarming findings for the fate of Vietnam's primates. At the beginning of the new millennium, among the many species that could be lost world-wide are mankind's closest relatives, the nonhuman primates. In Vietnam, many primates are either endangered or critically endangered. Three of the four species that are endemic to Vietnam are critically endangered: golden-headed langur Trachypithecus poliocephalus, Delacour’s langur T.
delacouri, Tonkin snub-nosed Monkey Rhinopithecus avunculus whilst the grey-shanked douc langur Pygathrix nemaeus is data deficient and may well be critically endangered in reality. These four primates are among the most endangered primates on earth. Without rigorous and immediate conservation interventions, these species are facing global extinction. Other primates, such as Western black-crested gibbons Nomascus concolor, are also facing extinction in Vietnam.
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Few data exist regarding long-term changes in primate populations in oldgrowth, tropical forests. In the absence of this information, it is unclear how to assess population trends efficiently and economically. We addressed these problems by conducting line-transect censuses 23.5 years apart at the Ngogo study area in Kibale National Park, Uganda. We conducted additional censuses over short time intervals to determine the degree to which the temporal distribution of censuses affected estimates of primate numbers. Results indicate that two species, blue monkeys and red colobus, may have experienced
significant reductions over the past 23.5 years at Ngogo. In contrast, five other species, baboons, black-and-white colobus, chimpanzees, mangabeys, and red-tailed guenons, have not changed in relative abundance. Additional findings indicate that different observers may vary significantly in their estimates of sighting distances of animals during censuses, thus rendering the use of measures of absolute densities problematic. Moreover, censuses conducted over short periods produce biased estimates of primate numbers. These results provide guidelines for the use of line-transect censuses and underscore the
importance of protecting large blocks of forests for primate conservation.
significant reductions over the past 23.5 years at Ngogo. In contrast, five other species, baboons, black-and-white colobus, chimpanzees, mangabeys, and red-tailed guenons, have not changed in relative abundance. Additional findings indicate that different observers may vary significantly in their estimates of sighting distances of animals during censuses, thus rendering the use of measures of absolute densities problematic. Moreover, censuses conducted over short periods produce biased estimates of primate numbers. These results provide guidelines for the use of line-transect censuses and underscore the
importance of protecting large blocks of forests for primate conservation.
The critically endangered Tana River red colobus (Procolobus rufomitratus Peters, 1879) and the endangered crested mangabey (Cercocebus galeritus galeritus Peters, 1879) are endemic to forest patches along the lower Tana River, Kenya(IUCN, 2000; Marsh, 1976, 1978a). The need to conserve them and their unique habitat led to the creation of the 171-km2Tana River Primate National Reserve (TRPNR) in 1976 (Marsh, 1976; Seal et al., 1991).
This report is an output of the ‘Green Corridor: meeting global conservation targets in a productive landscape project’, which is funded under the World Bank Global Environmental Facility Grant, No. TF052526, with funding from WWF Greater Mekong & Vietnam Country Programme, SNV and Thua Thien Hue Provincial Peoples Committee.
The primate survey work was supported by the USFWS Multinational Species Conservation Fund grant entitled ‘Raising the Standard: A conservation assessment of gibbons in Thua Thien Hue province, Vietnam’.
Estimating Primate Densities Using Home Range and Line
Transect Methods: A Comparative Test with the
Black Colobus Monkey Colobus satanas
DAVID BRUGIERE and MARIE-CLAIRE FLEURY
Universitd de Rennes I
Densities of Two Frugivorous Primates with respect to Forest and Fragment Tree Species composition and Fruit Availability
Kết quả nghiên cứu quần thể Voọc chà vá chân nâu tại khu BTTN Sơn Trà cho thấy: Vọoc chà vá chân nâu sống chủ yếu ở sinh cảnh rừng lá rộng thường xanh mưa mùa nhiệt đới và sinh cảnh rừng phục hồi; quần thể có 3 loại kích thước khác nhau; mật độ quần thể thay đổi khác nhau ở các sinh cảnh và các mùa; thành phần thức ăn gồm 9 loài thực vật. Những nhân tố ảnh hưởng đến quần thể Voọc chà vá chân nâu: làm đường, phát triển du lịch, thực vật gây hại, thiên tai và hoạt động khai thác tài nguyên rừng.
Báo cáo đánh giá tình trạng bảo tồn Linh trưởng ở Việt Nam, 2000 bao gồm những tư liệu đáng báo động về số phận của các loài Linh trưởng của Việt Nam
Đây là tài liệu rất hay về Leaf Monkeys ở Việt Nam. Hy vọng sẽ cung cấp cho các bạn nhiều thông tin lý thú về những loài này.
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