Estimating the population size of the Sanje mangabey (Cercocebus sanjei) using acoustic distance sampling.
Estimating the population size of the Sanje mangabey (Cercocebus sanjei) using acoustic distance sampling.
复制标题
使用声学距离采样估算桑杰白眉猴 (Cercocebus sanjei) 的种群规模。
DOI：
10.1002/ajp.23083
复制
发表时间：
2020
影响因子：
2.4
通讯作者：
Paddock CL
中科院分区：
文献类型：
--
作者：
Paddock CL
Sanje mangabey（Cercocebus sanjei）是坦桑尼亚Udzungwa山脉的特有物种，由于其种群数量不断下降，栖息地退化和破碎化而被列为濒危物种。以前的人口规模估计为1 350至3 500人，最近一次直接调查是在本研究之前15年进行的。以前的估计现在被认为低估了人口，因为对群体和栖息地大小的了解有限，非系统的方法和使用的视觉方法不适合调查Sanje mangabey及其半陆生和难以捉摸的行为。我们使用了声学调查方法，观察者记录了由白眉猴和点样带距离采样产生的独特的“whoop-gobble”发声，以模拟检测函数并估计丰度。在发现Sanje mangabey的两个森林中进行了28次调查：Udzungwa山脉国家公园的Mwanihana森林（n= 13）和Uzungwa Scarp自然保护区（n= 15）。与保护良好的Mwanihana森林（0.29组/平方公里; 95% CI：0.19-0.43;p= 0.03）相比，在相对未受保护的Uzungwa Scarp森林（0.15组/平方公里; 95% CI：0.08-0.27）中发现组密度显著较低。我们估计Mwanihana有1，712（95%CI：1，141 - 2，567）个个体，Uzungwa Scarp有1，455（95%CI：783- 2，702）个个体，导致总人口规模为3，167（95%CI：2，181 - 4，596）个个体。不同地点之间的群体密度差异可能是森林之间保护状况和执法水平不同的结果，这表明应加强对乌宗瓦陡坎的保护，以鼓励人口恢复，减少退化和狩猎的威胁。我们的研究结果有助于重新评估该物种的IUCN红色名录状态，并为管理和保护行动规划提供信息。
The Sanje mangabey (Cercocebus sanjei) is endemic to the Udzungwa Mountains, Tanzania, and is classified as Endangered due to its putatively declining population size, habitat degradation and fragmentation. Previous population size estimates have ranged from 1,350 to 3,500 individuals, with the last direct survey being conducted 15 years before the present study. Previous estimates are now thought to have underestimated the population due to a limited knowledge of group and habitat size, nonsystematic approaches and the use of visual methods that are not suitable for surveying the Sanje mangabey with its semi‐terrestrial and elusive behaviors. We used an acoustic survey method with observers recording the distinctive “whoop‐gobble” vocalization produced by mangabeys and point transect distance sampling to model a detection function and estimate abundance. Twenty‐eight surveys were conducted throughout the two forests where Sanje mangabeys are found: Mwanihana forest in the Udzungwa Mountains National Park (n= 13), and the Uzungwa Scarp Nature Reserve (n= 15). Group density was found to be significantly lower in the relatively unprotected Uzungwa Scarp forest (0.15 groups/km2; 95% CI: 0.08–0.27) compared to the well‐protected Mwanihana forest (0.29 groups/km2; 95% CI: 0.19–0.43;p= .03). We estimate that there are 1,712 (95% CI: 1,141–2,567) individuals in Mwanihana and 1,455 (95% CI: 783–2,702) in the Uzungwa Scarp, resulting in a total population size of 3,167 (95% CI: 2,181–4,596) individuals. The difference in group density between sites is likely a result of the differing protection status and levels of enforcement between the forests, suggesting that protection of the Uzungwa Scarp should be increased to encourage recovery of the population, and reduce the threat of degradation and hunting. Our results contribute to the reassessment of the species' IUCN Red List status and informing management and conservation action planning.