Van Tran Bang, Nguyen Minh Anh, Nguyen Dat Quoc, Truong Quan Bich Thi, Ang Andie, Covert Herbert H, Hoang Duc Minh
Southern Institute of Ecology, Vietnam Academy of Science and Technology, Hanoi, Vietnam.
University of Sciences, National University of Hochiminh City, Ho Chi Minh City, Vietnam.
Primates. 2017 Jul;58(3):435-440. doi: 10.1007/s10329-017-0610-2. Epub 2017 May 10.
Following the split of the silvered langurs of Indochina into two species based on molecular and phenotypic data, there is a need to reevaluate their distribution and update their conservation status. Here, we report the distribution and assess the population size of Germain's langur (Trachypithecus germaini) within its known range across Vietnam. We confirmed this species at six of seven survey sites in different habitats within three provinces in the Mekong Delta Region, including semi-evergreen forest at the Seven Mountains of An Giang Province, mangrove forest in Ngoc Hien and Nam Can Districts and Melaleuca forest in U Minh Ha National Park of Ca Mau Province, and limestone forest at Kien Luong Karst Area and semi-evergreen and evergreen forests at Phu Quoc National Park of Kien Giang Province. We found no evidence of this species in Mui Ca Mau National Park, Ca Mau Province where it was previously reported. We conservatively estimate that the total population of Germain's langurs in Vietnam consists of 362-406 individuals, with the largest population found in the Kien Luong Karst Area. Hunting and habitat loss are severely impacting Germain's langur, resulting in the extirpation of the population in Mui Ca Mau National Park and small, isolated populations in the Seven Mountains and Ngoc Hien and Nam Can Districts. However, the ability of this species to inhabit a wide range of forest types, and its increasing population sizes in Phu Quoc National Park and Kien Luong Karst Area, provide signs of hope that continued conservation actions may help in its long-term survival.
基于分子和表型数据，印度支那银叶猴被划分为两个物种后，有必要重新评估它们的分布并更新其保护状况。在此，我们报告了越南境内已知分布范围内德氏叶猴（Trachypithecus germaini）的分布情况，并评估了其种群数量。我们在湄公河三角洲地区三个省份不同栖息地的七个调查地点中的六个地点确认了该物种的存在，包括安江省七山的半常绿森林、富国县和南坚县的红树林、金瓯省乌明哈国家公园的千层林、建龙喀斯特地区的石灰岩森林以及坚江省富国国家公园的半常绿和常绿森林。我们在金瓯省的木架毛国家公园没有发现该物种的踪迹，此前该公园曾有过相关报道。我们保守估计，越南德氏叶猴的总种群数量为362 - 406只，其中数量最多的是建龙喀斯特地区。捕猎和栖息地丧失对德氏叶猴造成了严重影响，导致木架毛国家公园的种群灭绝，以及七山、富国县和南坚县出现小型孤立种群。然而，该物种能够栖息于多种森林类型，并且在富国国家公园和建龙喀斯特地区的种群数量不断增加，这为持续的保护行动可能有助于其长期生存带来了希望。
