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Transboundary conservation of the last remaining population of the cao vit gibbon Nomascus nasutus

机译：越境保护的曹毒灰色长臂猿NoAsutus的最后剩余人口

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摘要

The cao vit gibbon Nomascus nasutus, also known as eastern black crested gibbon, is categorized as Critically Endangered on the IUCN Red List and was considered one of the world's 25 most threatened primates. The only known population occurs along the border between China and Viet Nam. Accurate information on population size and dynamics is critical for the species' conservation, but population surveys conducted in only one country may over- or underestimate total population size because the home ranges of cao vit gibbon groups often cross the international border. In 2007 and 2016 we conducted two collaborative transboundary censuses of the cao vit gibbon populations in the Trung Khanh Cao Vit Gibbon Species and Habitat Conservation Area in Viet Nam and the Bangliang Gibbon National Nature Reserve in China. The results showed a population size of 102-110 in 2007, which increased to 107-136 in 2016. Our results indicate that previous surveys conducted separately in Viet Nam and China underestimated the global population size of this species. According to our more comprehensive surveys, the gibbon population is increasing slowly. The gibbons and their habitat are legally protected in both countries. Hunting and charcoal making have not been reported in this area since 2007. As habitat carrying capacity is a limiting factor, habitat restoration is required. However, lack of funding to protect the cao vit gibbon remains a challenge.
机译：Cao Vit Gibbon Nobascus Nasutus，也被称为东部黑色有冠长臂猿，被分类为在IUCN红色名单上批评，被认为是世界上25个最受威胁的灵长类动物之一。唯一已知的人口沿着中国与越南之间的边界发生。准确的人口规模和动态信息对于物种的保护至关重要，但只有一个国家进行的人口调查可能会过度或低估总人口规模，因为曹霉长臂集团的家庭范围经常跨越国际边界。 2007年和2016年，我们在越南的Trung Khanh Cao Vit Gibbon物种和栖息地保护区以及中国的邦林保护区进行了两种合作越境普查。结果表明，2007年人口大小为102-110，2016年增加到107-136。我们的结果表明，以前在越南和中国单独进行的调查低估了本物种的全球人口规模。根据我们更全面的调查，长臂猿人口正在慢慢增加。吉布斯及其栖息地在两国法律保护。自2007年以来，该地区尚未报告狩猎和木炭制作。随着居居承载能力是限制因素，需要栖息地恢复。然而，缺乏资金来保护Cao Vit长臂猿仍然是一个挑战。

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