Protectrice des Grands Singes de la Moukalaba (PROGRAM), Libreville, Gabon.
Protectrice des Grands Singes de la Moukalaba (PROGRAM), Libreville, Gabon,
Folia Primatol (Basel). 2021;92(2):103-111. doi: 10.1159/000513244. Epub 2021 Jan 26.
Accurate measures of animal population densities are essential to evaluate conservation status and implement action plans to ensure species survival. Gorilla numbers were assessed using the recce survey method within Moukalaba-Doudou National Park (MDNP) in Gabon using fresh nest counts of up to 1 week old. We walked 3,592 km within a 23.01-km2 study site totalling a sampling effort of 297 days. Encounter rate was 0.12 fresh nests per kilometre, and gorilla density estimates generated by home range sizes (by minimal convex polygon) ranged between 1.14 and 1.48 gorillas/km2. Gorillas preferred mixed forest for nesting over other habitats (Cheason index value 1.31). Results showed that gorilla density values within the study area concurred with previous studies that used line transect methodologies. We conclude that the choice of sampling design is dependent on environmental conditions characterised by each habitat type and target species.
准确的动物种群密度测量对于评估保护状况和实施行动计划以确保物种生存至关重要。在加蓬的穆卡拉巴-杜杜国家公园（MDNP）内，使用侦察调查方法评估了大猩猩的数量，使用最多 1 周龄的新鲜巢穴计数。我们在一个 23.01 平方公里的研究地点内行走了 3592 公里，总采样工作量为 297 天。遇到率为每公里 0.12 个新鲜巢穴，通过最小凸多边形生成的大猩猩栖息地面积（home range sizes）估计的密度在 1.14 到 1.48 只/平方公里之间。大猩猩更喜欢在混合森林中筑巢，而不是其他栖息地（Cheason 指数值为 1.31）。结果表明，研究区内大猩猩的密度值与使用线路截距方法的先前研究结果一致。我们得出结论，采样设计的选择取决于每个栖息地类型和目标物种的环境条件。
