We conducted a 5‐year monitoring survey of a population of Eisenia bicyclis kelp at a coastal area that suffered subsidence from the 2011 earthquake and the subsequent breakwater restoration work. Due to subsidence, the former intertidal area sank to the subtidal zone, therefore, the density of E. bicyclis increased because of many recruits. However, after the restoration work, the area harboring the recruits was destroyed and landfilled. In an area that sank below the pre‐subsidence border of the kelp distribution, recruits were rare. Furthermore, an indirect effect of the restoration work was also observed on recruitment in the intact offshore kelp zone. Our results showed that the breakwater restoration work following subsidence had negative effects, not only to the density but also to the age structure of the E. bicyclis population.

中文翻译：

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2011 年东北地震沉降后防波堤修复工程对潮下带海带种群的影响

我们对沿海地区因 2011 年地震和随后的防波堤修复工作而发生沉降的 Eisenia bicyclis 海带种群进行了为期 5 年的监测调查。由于下沉，原潮间带下沉到潮下带，因此，E. bicyclis 的密度因新兵增多而增加。然而，在修复工作之后，新兵所在的区域被摧毁和填埋。在海藻分布的沉降前边界以下沉没的地区，新兵很少。此外，还观察到恢复工作对完整近海海带区的补充产生了间接影响。我们的结果表明，沉降后的防波堤修复工作不仅对 E. bicyclis 种群的密度而且对年龄结构都有负面影响。