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首页> 外文期刊>The Canadian Field-Naturalist >Cues used by Predators to Detect Freshwater Turtle Nests may Persist Late into Incubation
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Cues used by Predators to Detect Freshwater Turtle Nests may Persist Late into Incubation

机译：捕食者用来检测淡水龟巢的线索可能会持续到孵化后期

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Previous studies have found that turtle nest depredation is concentrated immediately post-oviposition, likely because cues alerting predators to nest presence are most obvious during this time. In Algonquin Provincial Park, Ontario, we examined the frequency of nest depredation during the incubation period for Snapping Turtles (Chelydra serpentina [Linnaeus, 1758]) and Midland Painted Turtles (Chrysemys picta marginata [Agassiz, 1857]). Contrary to most past findings, nest depredation occurred throughout the incubation period for both species. In fact, 83% and 86% of depredation interactions with Snapping and Painted Turtle nests, respectively, occurred more than a week after oviposition at our study site. Peaks in nest depredation (weeks with >10% nest depredation) occurred late in incubation and may have coincided with hatching. Trail cameras deployed at four nesting sites revealed six predator species interacting with nests. The presence of predators at nest sites increased late in the incubation period indicating a persistence or renewal (from hatching) of cues; additional research is necessary to determine the nature of these cues. These findings have implications for both research and turtle conservation. Further research should examine the relationship between temporal changes in predator species' density and patterns of nest depredation. Additionally, in areas where protective nest caging is used as a species recovery action, it may be important to ensure that cages remain in place throughout the incubation period until emergence of hatchlings.
机译：先前的研究发现，在产卵后，海龟的巢穴掠食立即集中，这可能是因为在此期间最明显的提示是掠食者意识到巢穴的存在。在安大略省的阿尔冈金省立公园中，我们研究了鳄龟（Chelydra serpentina [Linnaeus，1758]）和米德兰彩龟（Chrysemys picta marginata [Agassiz，1857]）在潜伏期巢害的发生频率。与大多数过去的发现相反，整个物种的整个孵化期都发生巢穴掠夺。实际上，在我们的研究地点排卵一周后，分别有83％和86％的掠夺性相互作用与鲷鱼巢和彩绘龟巢发生。在孵化后期，巢的折旧达到高峰（巢折旧> 10％的几周），可能与孵化同时发生。部署在四个筑巢地点的追踪摄像机显示出六种与巢穴相互作用的食肉动物。在孵化后期，巢穴中捕食者的数量增加，表明线索的持续存在或更新（由于孵化）。要确定这些提示的性质，还需要进行其他研究。这些发现对研究和乌龟养护都有影响。进一步的研究应检查捕食者物种密度的时间变化与巢掠食模式之间的关系。此外，在使用保护性笼养作为物种恢复活动的地区，重要的是要确保在整个孵化期间保持笼子到位，直到孵化出幼体。

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