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首页> 外文期刊>Marine ecology progress series >Linking eelgrass decline and impacts on associated fish communities to European green crab Carcinus maenas invasion
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Linking eelgrass decline and impacts on associated fish communities to European green crab Carcinus maenas invasion

机译：将鳗草的衰退及其对相关鱼类群落的影响与欧洲绿色蟹肉蟹的入侵联系起来

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摘要

Following their first detection in Newfoundland in 2007, populations of invasive European green crabs Carcinus maenas (Linnaeus, 1758) have increased and spread throughout eelgrass Zostera marina meadows. Green crabs can reduce eelgrass biomass by damaging rhizomes and plant shoots when burrowing for shelter and digging for prey. Empirically demonstrating large spatial-scale impacts of green crabs on eelgrass and subsequent cascading effects on the ecosystem has proven difficult because of the general absence of effective baseline studies prior to an invasion of green crabs. We conducted surveys in Placentia and Bonavista bays, Newfoundland (20 sites) to compare eelgrass and associated fish communities before and after an invasion of green crabs. We analyzed eelgrass surveys from 1998 and 1999 (before green crab) and again in 2012 (after green crab) using a Before-After-Control-Impact (BACI) study design in order to isolate effects of crab-induced eelgrass loss from effects independent of green crabs. Underwater video sampling evaluated eelgrass change over time and indicated a 50% decline in eelgrass percent cover since 1998 at sites with green crabs, and eelgrass declines up to 100% at sites with highest abundances and longest established presence of green crabs. Beach seining showed a sharp decline in abundance and biomass of fish (similar to 10-fold between sites with and without green crabs) and indicated changes in fish community structure after green crab arrival at a site. Our results suggest cascading effects on fish communities and substantial potential impacts in coastal ecosystems occur following green crab invasion.
机译：自2007年在纽芬兰首次发现以来，入侵欧洲欧洲螃蟹Carcinus maenas（Linnaeus，1758）的种群数量增加，并遍及整个鳗草Zostera滨海草地。挖洞作为庇护所和挖掘猎物时，青蟹可以通过破坏根茎和植物嫩芽来减少鳗鱼的生物量。由于绿蟹入侵之前普遍缺乏有效的基线研究，因此难以凭经验证明绿蟹对鳗草的大规模空间尺度影响以及随后对生态系统的连锁影响。我们在纽芬兰的Placentia和Bonavista海湾（20个地点）进行了调查，以比较入侵绿色螃蟹之前和之后的鳗草和相关鱼类群落。我们使用控制后影响前（BACI）研究设计分析了1998年和1999年（青蟹之前）和2012年（青蟹之后）的鳗草调查，目的是将螃蟹诱发的鳗草损失的影响与影响的影响分开青蟹。水下视频采样评估了随时间变化的鳗草变化，并表明自1998年以来，绿蟹养殖场所的鳗草覆盖率下降了50％，而在绿蟹丰度最高和存在时间最长的地点，鳗草下降了100％。泳滩围网显示鱼类的丰度和生物量急剧下降（大约在有无绿蟹的地点之间为10倍），并表明在绿蟹到达该地点后鱼类群落结构发生了变化。我们的结果表明，对绿藻入侵后，对鱼类群落的级联效应和对沿海生态系统的潜在影响很大。

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  • 来源
    《Marine ecology progress series》 |2016年第21期|31-45|共15页
  • 作者

    Matheson K.; McKenzie C. H.; Gregory R. S.; Robichaud D. A.; Bradbury I. R.; Snelgrove P. V. R.; Rose G. A.;

  • 作者单位

    Fisheries & Oceans Canada, Ecol Sci Sect, Northwest Atlantic Fisheries Ctr, St John, NF A1C 5X1, Canada;

    Fisheries & Oceans Canada, Ecol Sci Sect, Northwest Atlantic Fisheries Ctr, St John, NF A1C 5X1, Canada;

    Fisheries & Oceans Canada, Ecol Sci Sect, Northwest Atlantic Fisheries Ctr, St John, NF A1C 5X1, Canada;

    LGL Ltd, Sidney, BC V8L 3Y8, Canada;

    Fisheries & Oceans Canada, Ecol Sci Sect, Northwest Atlantic Fisheries Ctr, St John, NF A1C 5X1, Canada;

    Mem Univ Newfoundland, Dept Ocean Sci, St John, NF A1C 5S7, Canada|Mem Univ Newfoundland, Dept Biol, St John, NF A1C 5S7, Canada;

    Mem Univ Newfoundland, Fisheries & Marine Inst, Ctr Fisheries Ecosyst Res, St John, NF A1C 5R3, Canada;

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  • 正文语种 eng
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  • 关键词

    Invasive species; Green crab; Eelgrass; Fish community; Before-After-Control-Impact; BACI;

    机译：外来入侵物种;绿蟹;鳗草;鱼群落;防治前后影响;BACI;

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