Data and R code for "Thirty years of arboreal wildlife trends in an African rainforest under evolving threats and researchers' presence".

This dataset and R code are used in the study "Thirty years of arboreal wildlife trends in an African rainforest under evolving threats and researchers' presence". This study looked at long-term surveys of arboreal wildlife (primates, hornbills, and grey parrots) in the Dja Faunal Reserve from 1995 to 1999 and 2017 to 2024. Trails around the Bouamir Research Station were walked monthly and both visual and auditory detections of different species were recorded. We calculated a relative abundance index (RAI) of different species for each month by dividing the number of detections by the number of kilometers surveyed that month (each month is treated as one big transect). We fit Generalized Additive Models of the RAIs over time for each species to try to assess population trends.

本数据集与配套R代码应用于题为《面临持续演变的威胁与研究者活动背景下的非洲雨林30年树栖野生动物种群趋势》的研究。该研究针对德贾动物保护区（Dja Faunal Reserve）内的树栖野生动物（灵长类、犀鸟与灰鹦鹉）开展长期调查，调查时段涵盖1995至1999年以及2017至2024年。研究人员每月沿布阿米尔研究站（Bouamir Research Station）周边的步道进行徒步调查，记录不同物种的目视与听觉观测结果。我们通过将当月物种观测总次数除以当月调查的步道总公里数，计算得到各物种当月的相对丰富度指数（relative abundance index, RAI），并将每个月视作一条完整的样线。随后我们针对各物种的相对丰富度指数拟合时间维度的广义加性模型（Generalized Additive Models, GAMs），以评估其种群变化趋势。