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首页> 外文期刊>Journal of Field Ornithology >Comparison of mechanically egg-triggered cameras and time-lapse video cameras in identifying predators at Dusky Flycatcher nests
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Comparison of mechanically egg-triggered cameras and time-lapse video cameras in identifying predators at Dusky Flycatcher nests

机译：机械式触发鸡蛋的摄像头和延时视频摄像头在识别昏暗捕蝇器巢中捕食者中的比较

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摘要

We compared the effectiveness and reliability of mechanically egg-triggered set-cameras and time-lapse video cameras in identifying nest predators at active Dusky Flycatcher (Empidonax oberholseri) nests in Siskiyou County, California. We monitored 72 active flycatcher nests using camera systems from 1998 to 2000. Nest abandonment, hatching success, and daily survival rate did not differ between camera systems. Set-cameras were less reliable than video systems in successfully recording predation events (45% versus 95%). The nest predator assemblage between camera types differed significantly with more avian predators (primarily raptors) recorded at video-monitored nests. This may have been due to the failure of hawks and owls to take the trigger egg at set-camera nests during the nestling stage. We did not find a strong association between the condition of the nest (disturbed or undisturbed) after the predation event and the identity of the predator (mammalian or avian). We also documented disruption of the nest by visitors other than the original predator. These observations suggest that identification of nest predators based on nest remains can be highly inaccurate. We recommend the use of vide-ography for accurate identification of nest predators. Results from studies identifying predators with egg-triggered cameras should limit conclusions to the incubation stage.
机译：我们比较了机械鸡蛋触发的固定相机和延时摄影机在识别加利福尼亚锡斯基尤县活跃的Dusky Flycatcher（Empidonax oberholseri）巢中的巢捕食者中的有效性和可靠性。我们从1998年到2000年使用摄像头系统监视了72个活动捕蝇器巢。在各个摄像头系统之间，燕窝的遗弃率，孵化成功率和每日生存率没有差异。在成功记录掠食事件方面，固定摄像机不如视频系统可靠（45％比95％）。摄像机类型之间的巢捕食者组合明显不同，在视频监控的巢中记录了更多的鸟类捕食者（主要是猛禽）。这可能是由于鹰和猫头鹰在雏鸟阶段未能在固定摄影机的鸟巢中获取触发卵的缘故。在捕食事件之后，巢的状况（受干扰或不受干扰）与掠食者的身份（哺乳动物或禽鸟）之间没有发现强关联。我们还记录了原始捕食者以外的访客破坏巢穴的情况。这些观察结果表明，基于巢残留物识别巢捕食者可能是非常不准确的。我们建议使用视频影像技术来准确识别巢状捕食者。用鸡蛋触发相机识别天敌的研究结果应将结论限制在孵化阶段。

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