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Seaweed community response to a massive CO2 input

机译：海藻社区对大量二氧化碳输入的反应

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Changes in the structure of seaweed communities were examined following a massive CO2 input caused by a submarine eruption near the coast of El Hierro island (Canary Islands, Spain). The event lasted almost five months (October 2011-March 2012) and created a significant pH gradient. Specifically, we compared three different zones: highly affected with extreme low pH (6.7-7.3), affected with low pH (7.6 -7.8), and unaffected ambient pH zone (similar to 8.1) according to the pH gradient generated by the predominate currents and waves in the south of the island. Studies were carried out before, during and after the CO2 input event in each zone. We found community-wide effects on seaweed communities during the eruption; these included changes in species abundance and changes in the diversity. However, changes in all these community traits were only evident in the highly affected zone, where there were major shifts in the seaweed community, with a replacement of Lobophora variegate by ephemeral seaweeds. Lobophora variegate dropped in cover from 87-94 to 27% while ephemeral seaweeds increased 6-10 to 29%. When the impact ended Lobophora variegate began to recover reaching a cover higher than 60%. In the moderate affected area the Lobophora variegate canopies maintained their integrity avoiding phase shifts to turfs. Here the only significant changes were the reduction of the cover of the crustose and geniculate coralline algae. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在El Hierro岛（西班牙加那利群岛）附近的海底火山爆发引起大量二氧化碳输入之后，研究了海藻群落结构的变化。该活动持续了将近五个月（2011年10月至2012年3月），并造成了明显的pH梯度。具体来说，我们根据主要电流产生的pH梯度，比较了三个不同的区域：受到极低pH值（6.7-7.3）的高度影响，受低pH值（7.6 -7.8）的影响以及不受影响的环境pH区域（类似于8.1）。和岛屿南部的海浪。在每个区域的二氧化碳输入事件之前，之中和之后进行了研究。在喷发期间，我们发现了整个社区对海藻群落的影响；其中包括物种丰度的变化和多样性的变化。但是，所有这些群落特征的变化仅在受灾最严重的地区明显，那里的海藻群落发生了重大变化，用短暂的海藻替代了杂色的罗布波拉。杂色罗布泊的覆盖率从87-94下降到27％，而短暂海藻的覆盖率从6-10上升到29％。撞击结束后，杂色罗布泊开始恢复，覆盖率超过60％。在中度受灾地区，杂色罗布泊冠层保持其完整性，避免相移至草皮。在这里唯一显着的变化是减少了壳糖和膝状珊瑚藻的覆盖。 （C）2016 Elsevier Ltd.保留所有权利。

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