Quantifying and monitoring the risk of defaunation and extinction require assessing and monitoring biodiversity in impacted regions. Camera traps that photograph animals as they pass sensors have revolutionized wildlife assessment and monitoring globally. We conducted a global review of camera trap research on terrestrial mammals over the last two decades. We assessed if the spatial distribution of 3395 camera trap research locations from 2324 studies overlapped areas with high defaunation risk. We used a geospatial distribution modeling approach to predict the spatial allocation of camera trap research on terrestrial mammals and to identify its key correlates. We show that camera trap research over the past two decades has not targeted areas where defaunation risk is highest and that 76.8% of the global research allocation can be attributed to country income, biome, terrestrial mammal richness, and accessibility. The lowest probabilities of camera trap research allocation occurred in low-income countries. The Amazon and Congo Forest basins – two highly biodiverse ecosystems facing unprecedented anthropogenic alteration – received inadequate camera trap research attention. Even within the best covered regions, most of the research (64.2%) was located outside the top 20% areas where defaunation risk was greatest. To monitor terrestrial mammal populations and assess the risk of extinction, more research should be extended to regions with high defaunation risk but have received low camera trap research allocation.

中文翻译：

---

相机陷阱研究分配的全球差异和陆地哺乳动物动物区系丧失的风险

量化和监测动物区系丧失和灭绝的风险需要评估和监测受影响地区的生物多样性。当动物经过传感器时拍摄动物的相机陷阱彻底改变了全球野生动物评估和监测。我们对过去二十年里陆地哺乳动物的相机陷阱研究进行了全球回顾。我们评估了 2324 项研究中 3395 个相机陷阱研究地点的空间分布是否与动物区系丧失高风险的区域重叠。我们使用地理空间分布建模方法来预测陆地哺乳动物相机陷阱研究的空间分配并确定其关键相关性。我们表明，过去二十年的相机陷阱研究并未针对动物区系丧失风险最高的地区，并且全球研究分配的 76.8% 可归因于国家收入、生物群落、陆地哺乳动物丰富度和可达性。相机陷阱研究分配的概率最低发生在低收入国家。亚马逊和刚果森林盆地——两个面临前所未有的人为改变的高度生物多样性的生态系统——没有得到足够的相机陷阱研究关注。即使在覆盖最好的区域内，大多数研究 (64.2%) 也位于动物区系丧失风险最大的前 20% 区域之外。为了监测陆地哺乳动物种群并评估灭绝风险，应将更多研究扩展到动物区系丧失风险高但相机陷阱研究分配较低的地区。