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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Burial of seeds and seedlings by the lugworm Arenicola marina hampers eelgrass (Zostera marina) recovery
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Burial of seeds and seedlings by the lugworm Arenicola marina hampers eelgrass (Zostera marina) recovery

机译：夜蛾Arenicola marina埋藏种子和幼苗会阻碍鳗草（Zostera marina）的恢复

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摘要

Eelgrass (Zostera marina) used to dominate the vegetation in Odense Fjord, Denmark, and covered >17 km~2 of the shallow fjord in 1983. Decades of excessive nutrient loading has lead to decreased eelgrass distribution, and only ~2 km~2 is covered at present The state of low eelgrass coverage has not changed despite significant improvements of water quality in the past > 10 years, and lugworms, Arenicola marina, have colonized the former eelgrass areas (1-8 ind. m~(-2)). It was hypothesized that the lack of eelgrass recovery was due to A marina, which was investigated by a combined field and laboratory approach. At a study site where eelgrass used to dominate, a seasonal study of lugworm population dynamics and sediment reworking activity was performed. Additionally, density dependent burial of eelgrass seeds and seedlings due to sediment reworking by A marina was investigated in mesocosm experiments. Our results indicate that A marina may negatively impact eelgrass recovery, since sediment reworking lead to rapid burial of eelgrass seeds and seedlings; within 1-2 months, 95% of seeds and 75% of seedlings were buried below critical depth. Considerations based on empirical modeling suggest that negative impact occur even at low A marina density (5-10 ind. m~(-2)). Therefore the spread of A marina into former eelgrass areas is critical, since eelgrass recovery may be severely impaired, even when water quality favors eelgrass recolonization.
机译：Eelgrass（Zostera marina）过去是丹麦欧登塞峡湾的主要植被，1983年覆盖了浅峡湾的> 17 km〜2。数十年的过量养分导致鳗鱼草的分布减少，只有〜2 km〜2尽管过去10年来水质有了显着改善，但鳗草覆盖率低的状况并未改变，而夜蛾蠕虫Arenicola marina则殖民了以前的鳗草地区（1-8 ind。m〜（-2））。 。据推测，鳗鱼草缺乏的恢复是由于码头，这是通过现场和实验室相结合的方法进行调查的。在鳗鱼曾经占主导地位的研究地点，对a虫种群动态和沉积物再加工活动进行了季节性研究。此外，在中观实验中研究了由于A码头的底泥返工而引起的鳗草种子和幼苗密度依赖性的埋葬。我们的研究结果表明，码头可能会对鳗草的恢复产生负面影响，因为沉积物的重新加工导致鳗草种子和幼苗的快速埋葬。在1-2个月内，95％的种子和75％的幼苗被埋在临界深度以下。基于经验模型的考虑表明，即使在低A码头密度（5-10 ind。m〜（-2））下也会产生负面影响。因此，即使在水质有利于鳗草重新定殖的情况下，鳗鱼的恢复也可能受到严重损害，因此将A码头扩散到以前的鳗草地区至关重要。

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