High resilience of harpacticoid copepods in the landward slope of the Japan Trench against disturbance of the 2011 Tohoku Earthquake
High resilience of harpacticoid copepods in the landward slope of the Japan Trench against disturbance of the 2011 Tohoku Earthquake
复制标题
日本海沟向陆斜坡上的类桡足类动物对 2011 年东北地震扰动的高恢复能力
DOI：
10.1002/lno.11006
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发表时间：
2018
影响因子：
4.5
通讯作者：
Shimanaga Motohiro
中科院分区：
文献类型：
--
作者：
Kitahashi Tomo;Jenkins Robert G.;Kojima Shigeaki;Shimanaga Motohiro
2011年3月11日，在宫城县外海发生了被称为“2011年东北太平洋沿岸地震”的里氏9.0级地震。为了评估地震对深海生态系统的影响，我们比较了日本东北部三陆附近日本海沟向陆坡的6个站位(水深10 0~6 0 0 0 m)的触角类组合。我们在地震后4.5个月(2011年)和1.5年(2012年)在相同的地点收集了样本。2011年和2012年，在多样性和群落组成方面，竖琴类群落的深度相关格局没有显著差异。三陆地区与参照区(距离三陆地区500 KM的千岛地区)在地震发生后，竖琴类群落组成随水深的变化格局没有显著差异。我们的结果表明，三陆地区的竖琴组合没有受到地震的影响，或者地震后很快就恢复了。在我们研究区域内，大地震平均每隔500年发生一次。观察到的竖琴类组合对地震的高韧性表明，在每500 年或更长时间发生一次大扰动的情况下，具有高抗扰动能力的底栖生物占主导地位。
On 11 March 2011, an earthquake of magnitude Mw 9.0 known as “the 2011 off the Pacific coast of Tohoku Earthquake” occurred off the coast of Miyagi Prefecture. To assess the effect of the earthquake on the deep‐sea ecosystem, we compared harpacticoid assemblages at six stations (100–6000 m water depth) in the landward slope of the Japan Trench off Sanriku in northeastern Japan. We collected samples at the same locations after 4.5 months (2011) and 1.5 yr (2012) after the earthquake. There were no significant differences in depth‐related patterns of harpacticoid assemblages in terms of diversity and community composition between 2011 and 2012. Changing patterns of harpacticoid community composition along water depth in the Sanriku region after the earthquake did not significantly differ from those in the reference region (Kuril region, 500 km away from the Sanriku region, Japan). Our results suggest that the harpacticoid assemblage at the Sanriku region was not affected by the earthquake or that it quickly recovered after the event. Around our study area, large earthquakes have occurred at 500‐yr intervals on average. The observed high resilience of harpacticoid assemblages against the earthquake suggest that benthos with high resilience against disturbance are dominant under a situation in which large disturbances occur every 500 yr or more.