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首页> 外文期刊>Marine biology >A field test of the effects of mesopredators and landscape setting on juvenile oyster, Crassostrea virginica, consumption on intertidal reefs
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A field test of the effects of mesopredators and landscape setting on juvenile oyster, Crassostrea virginica, consumption on intertidal reefs

机译：田间试验对中牡蛎和景观环境对牡蛎牡蛎，潮间带食用的影响

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摘要

Oyster populations are often structured by both biotic interactions and abiotic stresses. Juvenile oysters, i.e., those most vulnerable to predation, face a wide range of predatory characteristics (size, mobility) such that predator identity might exert a strong influence on oyster populations. Likewise, oyster reef location, either as isolated patch reefs or saltmarsh-fringing reefs, can strongly influence the ecological processes impacting oyster populations. Therefore, this study sought to quantify the contribution of predator identity, in particular mesopredators, to oyster survival in the field, while also examining the role of landscape setting in predation. Using a multiple mesh size cage design, oyster survival was measured by excluding access to different groups of predators at both patch and fringing reef and reference sites in Hewlett's Creek, Wilmington, North Carolina, in August/September 2013, while also monitoring settlement and recruitment at both reef locations from May to August 2013. The results indicated a significant cage by location interaction, indicating that the predator identity or modality was not the same across all sites. Despite this, at either reef location, oyster survival did not differ between 37-mm mesh cages, which allowed access only by mesopredators, and no-cage treatments, which allowed access to all predators, while survival was reduced by > 20 % on fringing reefs relative to patch reefs. This study demonstrates the significant contribution of mesopredators, likely xanthid crabs, to oyster predation in the field at ambient predator densities and suggests that the differences in oyster abundance between patch and fringing reef locations are likely due to differential predation.
机译：牡蛎种群通常由生物相互作用和非生物胁迫共同构成。少年牡蛎，即最容易被捕食的牡蛎，面临着各种各样的掠食性特征（大小，迁移率），因此，捕食者的身份可能会对牡蛎种群产生强烈影响。同样，牡蛎礁的位置，无论是孤立的斑块礁还是盐沼边缘的礁，都可能强烈影响影响牡蛎种群的生态过程。因此，本研究试图量化捕食者身份，尤其是中食者对野外牡蛎生存的贡献，同时还研究了景观设置在捕食中的作用。使用多重网眼大小的笼子设计，2013年8月/ 9月，通过排除在北卡罗来纳州威尔明顿的惠普溪中的补丁鱼和边缘礁以及参考点进入不同捕食者群的牡蛎生存率，同时还监测定居和募集情况在2013年5月至2013年8月的两个珊瑚礁地点，该结果都表明地点之间的相互作用影响了整个网箱，表明所有地点的捕食者身份或形态都不相同。尽管如此，在任何一个珊瑚礁位置，牡蛎的存活率在37 mm网眼的网箱中都没有区别，网箱只允许中捕食者进入，而无笼处理则允许所有捕食者进入，而流苏的存活率降低了> 20％礁相对于斑块礁。这项研究表明，中性捕食者（可能是黄op蟹）对环境捕食者密度的田间牡蛎捕食具有重要作用，并表明斑块和边缘礁位置之间的牡蛎丰度差异可能是由于捕食差异造成的。

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  • 来源
    《Marine biology》 |2015年第5期|993-1003|共11页
  • 作者

    Carroll John M.; Marion John P.; Finelli Christopher M.;

  • 作者单位

    Univ N Carolina, Dept Biol & Marine Biol, Wilmington, NC 28401 USA;

    Univ N Carolina, Dept Biol & Marine Biol, Wilmington, NC 28401 USA;

    Univ N Carolina, Dept Biol & Marine Biol, Wilmington, NC 28401 USA;

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