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首页> 外文期刊>Marine biology >Drastic decline of an extensive eelgrass bed in Nova Scotia due to the activity of the invasive green crab (Carcinus maenas)
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Drastic decline of an extensive eelgrass bed in Nova Scotia due to the activity of the invasive green crab (Carcinus maenas)

机译：由于侵入性绿蟹（Carcinus maenas）的活动，新斯科舍省大量鳗鱼草床急剧减少

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摘要

In 2001-2002, there were severe declines of eelgrass (Zostera marina) in estuaries along the Nova Scotia coast of the southern Gulf of St. Lawrence. We examined the relationship between the recent invasion of European green crabs (Carcinus maenas) and the eelgrass decline in Benoit Cove in Tracadie Harbour. The abnormally abundant eelgrass wrack consisted mainly of entire shoots, not the usual blades. Three separate methods yielded similar estimates of the rate of shoot removal from the eelgrass beds (direct quadrat counts, "mark-recapture" of tagged shoots in the eelgrass bed, and rate of shoot appearance in the shore wrack). From 14 July to 8 September 2002, the shoot density in the bed fell by about 75 %. Similar rates of decline occurred in crab enclosures (4.4 crabs m~(-2)) placed in the eelgrass bed. Green crab foraging, involving the tearing of shoots and the digging of large pits, was the reason for the drastic decline of the eelgrass bed in Benoit Cove. It is clear that an invasion of green crabs to a region where they had not previously existed can both destroy eelgrass beds and restrict their recovery.
机译：在2001年至2002年期间，圣劳伦斯湾南部的新斯科舍省沿岸的河口鳗草（Zostera marina）急剧下降。我们检查了最近入侵的欧洲绿色螃蟹（Carcinus maenas）与Tracadie Harbour Benoit Cove鳗鱼数量下降之间的关系。异常丰富的鳗草残骸主要是整个芽，而不是通常的叶片。三种单独的方法对从鳗草床中去除芽的速率进行了类似的估计（直接正交计数，在鳗草床中标记的芽的“标记重新捕获”，以及在海岸残骸中出现茎的速率）。从2002年7月14日至9月8日，床上的幼芽密度下降了约75％。放置在鳗草床上的螃蟹围栏（4.4只螃蟹m〜（-2））发生了类似的下降速度。青蟹的觅食，包括芽的撕裂和大坑​​的挖掘，是导致贝努瓦湾鳗鱼床急剧下降的原因。显然，将绿蟹入侵到以前不存在的地区既会破坏鳗草床并限制其恢复。

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  • 来源
    《Marine biology》 |2014年第1期|3-15|共13页
  • 作者

    David J. Garbary; Anthony G. Miller; Jim Williams; Norm R. Seymour;

  • 作者单位

    Department of Biology, St. Francis Xavier University,Antigonish, NS B2G 2W5, Canada;

    Department of Biology, St. Francis Xavier University,Antigonish, NS B2G 2W5, Canada;

    Department of Biology, St. Francis Xavier University,Antigonish, NS B2G 2W5, Canada;

    Department of Biology, St. Francis Xavier University,Antigonish, NS B2G 2W5, Canada;

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