Comparing ape densities and habitats in northern congo: Surveys of sympatric gorillas and chimpanzees in the odzala and ndoki regions
Comparing ape densities and habitats in northern congo: Surveys of sympatric gorillas and chimpanzees in the odzala and ndoki regions
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DOI：
10.1002/ajp.20514
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发表时间：
2008-05-01
影响因子：
2.4
通讯作者：
Huynen, Marie-Claude
中科院分区：
文献类型：
--
作者：
Devos, Celine;Sanz, Crickette;Huynen, Marie-Claude
西赤道非洲西部低地大猩猩和中部黑猩猩的保护状况在很大程度上仍然是推测性的，因为许多偏远地区从未进行过调查，该地区出现的疾病的影响也没有得到很好的记录。在这项研究中，我们比较了刚果共和国北部Odzala国家公园Lokoue研究区和Nouabale-Ndoki国家公园Goualougo三角的类人猿密度和栖息地。长期以来，这两个地点都被认为是黑猩猩和大猩猩的栖息地，但据推测，它们的营养成分和类人猿的相对数量有所不同。我们使用传统的地面调查和分类的Landsat-7 ETM+卫星图像比较了这些地点之间的栖息地。我们首次通过直立作物和标记巢方法对刚果盆地的同域类人猿进行了密度估计。标记巢法在描述黑猩猩密度方面是有效的，但在两个地点都低估了大猩猩的密度。标记巢调查还显示，Lokou6的猿类种群数量急剧下降，与当地埃博拉疫情同时发生。在重复的标记巢调查中，猿巢接触率的正常基线波动与lokou8 %的猿巢接触率下降明显不同。结果表明，刚果北部不同种群的类人猿密度、生境组成和种群动态存在差异。我们强调加强监测工作和进一步改进类人猿调查方法的重要性，因为我们的结果表明，即使是在完整和受保护的森林中最大的类人猿种群也容易受到突然和急剧下降的影响。点。[j] .林业科学与技术，2008。(c) 2008 Wiley-Liss, Inc。
The conservation status of western lowland gorillas and central chimpanzees in western equatorial Africa remains largely speculative because many remote areas have never been surveyed and the impact of emergent diseases in the region has not been well documented. In this study, we compared ape densities and habitats in the Lokoue study area in Odzala National Park and the Goualougo Triangle in Nouabale-Ndoki National Park in northern Republic of Congo. Both of these sites have long been considered strongholds for the conservation of chimpanzees and gorillas, but supposedly differ in vegetative composition and relative ape abundance. We compared habitats between these sites using conventional ground surveys and classified Landsat-7 ETM+ satellite images. We present density estimates via both standing-crop and marked-nest methods for the first time for sympatric apes of the Congo Basin. The marked-nest method was effective in depicting chimpanzee densities, but underestimated gorilla densities at both sites. Marked-nest surveys also revealed a dramatic decline in the ape population of Lokou6 which coincided with a local Ebola epidemic. Normal baseline fluctuations in ape nest encounter rates during the repeated passages of marked-nest surveys were clearly distinguishable from a 80% decline in ape nest encounter rates at Lokou6. Our results showed that ape densities, habitat composition, and population dynamics differed between these populations in northern Congo. We emphasize the importance of intensifying monitoring efforts and further refinement of ape survey methods, as our results indicated that even the largest remaining ape populations in intact and protected forests are susceptible to sudden and dramatic declines. Am. J. Primatol. 70:439-451, 2008. (c)) 2008 Wiley-Liss, Inc.