Impact of the 2011 Tohoku earthquake tsunami on zooplankton community in Otsuchi Bay, northeastern Japan
Impact of the 2011 Tohoku earthquake tsunami on zooplankton community in Otsuchi Bay, northeastern Japan
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DOI：
10.1007/s10872-015-0339-8
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发表时间：
2016-02
影响因子：
2.3
通讯作者：
Y. Nishibe;H. Isami;H. Fukuda;S. Nishida;T. Nagata;Aiko Tachibana;A. Tsuda
中科院分区：
文献类型：
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作者：
Y. Nishibe;H. Isami;H. Fukuda;S. Nishida;T. Nagata;Aiko Tachibana;A. Tsuda
2011年5月至2013年5月，在日本东北部大槌湾调查了中型浮游动物丰度和分布的季节变化，以阐明2011年东北地震海啸对浮游动物群落的影响。在海啸后的2年中，浮游动物的丰度和组成显示出相似的季节变化。与海啸前的数据比较，从海湾的社区表明，季节性在占主导地位的浮游动物类群，如桡足类，apapaperularians和枝角类，海啸前后没有改变。此外，在海啸前后，桡足类的季节性物种组成没有明显的差异，在海啸后（2011年5月）以及1年和2年后（分别为2012年5月和2013年5月），观察到海湾中的优势桡足类，具有底栖休息阶段，有很高的丰度。这些结果表明，有没有重大和持久的影响，巨大的海啸对浮游动物类群。相比之下，2011年5月，海湾内部的双壳类、腹足类和多毛类的浮游幼虫数量减少，这可能反映了海啸对其底栖种群造成的损害。
Seasonal changes in abundance and distribution of mesozooplankton were investigated in Otsuchi Bay, northeastern Japan during a 2-year period from May 2011 to May 2013, in order to elucidate the impacts of the 2011 Tohoku earthquake tsunami on plankton communities. Mesozooplankton abundance and composition showed similar seasonal variation in each of the 2 years after the tsunami. Comparison with pre-tsunami data for communities from the bay showed that seasonality in dominant holozooplankton taxa, such as copepods, appendicularians and cladocerans, did not change before and after the tsunami. In addition, there were no observable differences in the seasonal species composition of copepods between pre- and post-tsunami periods.Acartia hudsonica, a dominant copepod in the bay, which has a benthic resting stage, was observed with high abundance immediately after the tsunami (May 2011) as well as 1 and 2 years later (May 2012 and May 2013, respectively). These findings suggest that there were no significant and lasting influences of the huge tsunami on the holozooplankton taxa. In contrast, planktonic larvae of bivalves, gastropods and polychaetes showed reduced abundance at the inner part of the bay in May 2011, possibly reflecting the damage due to the tsunami on their benthic populations.