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首页> 外文期刊>Marine biology >Conservation implications of density-dependent predation by ghost crabs on hatchling sea turtles running the gauntlet to the sea
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Conservation implications of density-dependent predation by ghost crabs on hatchling sea turtles running the gauntlet to the sea

机译：幽灵蟹依赖密度捕食对孵化海龟的捕捞海龟的保护意义

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摘要

Protecting eggs from predators is common practice in sea turtle conservation, but routine protection of hatchlings is not. Of 42 loggerhead hatchlings observed emerging from 10 nests on undeveloped Onslow Beach, North Carolina, 24 % were preyed on by ghost crabs. In experimental trials, ghost crabs similarly threatened and captured neonate freshwater sliders, supporting their substitution as proxy for threatened and endangered sea turtle hatchlings in field experiments testing density dependence. Exploiting natural long-shore variation in ghost crab density, we show that a 2.6-fold higher ghost crab density resulted in 5 times more nocturnal threat encounters with sliders and 3.4 times more slider captures. Sliders released in simulated group emergences experienced lower per capita capture risk by ghost crabs than solitary sliders, implying predator dilution. Non-independence of egg and hatchling depredation motivates consideration of merging sea turtle egg and hatchling stages when modeling and managing food web interactions.
机译：在海龟养护中，保护蛋免受捕食者的侵害是很常见的做法，但对雏鱼的常规保护却不是。在北卡罗来纳州未开发的昂斯洛海滩的10个巢中观察到的42只鱼孵化场中，有24％的捕食者是幽灵蟹。在实验性试验中，幽灵蟹同样威胁并捕获了新生的淡水滑块，并在野外试验中测试密度依赖性时，支持它们替代受威胁和濒危的海龟幼体。利用幽灵蟹密度的自然近岸变化，我们发现，幽灵蟹密度高2.6倍，导致与滑子发生的夜间威胁相遇次数增加了5倍，而滑鼠被捕获的次数则增加了3.4倍。在模拟的群体出现中释放的滑块，与单独的滑块相比，鬼蟹的人均捕获风险更低，这意味着捕食者被稀释了。卵和孵化过程的不独立性促使人们在建模和管理食物网交互时考虑合并海龟卵和孵化阶段。

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  • 来源
    《Marine biology》 |2013年第3期|629-640|共12页
  • 作者

    Charles H. Peterson; Stephen R. Fegley; Christine M. Voss; Sara R. Marschhauser; Beth M. VanDusen;

  • 作者单位

    Institute of Marine Sciences, University of North Carolina at Chapel Hill, 3431 Arendell Street, Morehead City, NC 28557, USA;

    Institute of Marine Sciences, University of North Carolina at Chapel Hill, 3431 Arendell Street, Morehead City, NC 28557, USA;

    Institute of Marine Sciences, University of North Carolina at Chapel Hill, 3431 Arendell Street, Morehead City, NC 28557, USA;

    Department of Fisheries and Wildlife Sciences, North Carolina State University, Raleigh, NC 27695, USA;

    Institute of Marine Sciences, University of North Carolina at Chapel Hill, 3431 Arendell Street, Morehead City, NC 28557, USA;

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