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Testing the Prey-Trap Hypothesis at Two Wildlife Conservancies in Kenya

机译:在肯尼亚的两次野生动植物试验中检验捕食陷阱假说

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摘要

Protecting an endangered and highly poached species can conflict with providing an open and ecologically connected landscape for coexisting species. In Kenya, about half of the black rhino (Diceros bicornis) live in electrically fenced private conservancies. Purpose-built fence-gaps permit some landscape connectivity for elephant while restricting rhino from escaping. We monitored the usage patterns at these gaps by motion-triggered cameras and found high traffic volumes and predictable patterns of prey movement. The prey-trap hypothesis (PTH) proposes that predators exploit this predictable prey movement. We tested the PTH at two semi-porous reserves using two different methods: a spatial analysis and a temporal analysis. Using spatial analysis, we mapped the location of predation events with GPS and looked for concentration of kill sites near the gaps as well as conducting clustering and hot spot analysis to determine areas of statistically significant predation clustering. Using temporal analysis, we examined the time lapse between the passage of prey and predator and searched for evidence of active prey seeking and/or predator avoidance. We found no support for the PTH and conclude that the design of the fence-gaps is well suited to promoting connectivity in these types of conservancies.
机译:保护濒临灭绝的水煮物种可能与为共存物种提供开放的生态联系景观相冲突。在肯尼亚,约有一半的黑犀牛(Diceros bicornis)生活在电围栏的私人保护区中。特制的栅栏间隙允许大象进行一些景观连接,同时限制犀牛逃逸。我们通过运动触发的摄像头监控了这些间隙的使用模式,发现流量高并且可预测的猎物运动模式。捕食陷阱假说(PTH)提出,捕食者利用这种可预测的猎物运动。我们使用两种不同的方法在两个半多孔储层中测试了PTH:空间分析和时间分析。使用空间分析,我们使用GPS绘制了捕食事件的位置,并寻找了缺口附近的杀伤点浓度,并进行了聚类和热点分析,以确定具有统计意义的捕食聚类区域。使用时间分析,我们检查了猎物和掠食者通过之间的时间间隔,并搜索了主动寻找猎物和/或避免捕食者的证据。我们没有发现对PTH的支持,并得出结论,栅栏间隙的设计非常适合促进这些类型的保护区的连通性。

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