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首页> 外文期刊>Journal of oceanography >Effects of mass sedimentation events after the 2011 off the Pacific coast of Tohoku?Earthquake on benthic prokaryotes and meiofauna inhabiting the upper bathyal sediments
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Effects of mass sedimentation events after the 2011 off the Pacific coast of Tohoku?Earthquake on benthic prokaryotes and meiofauna inhabiting the upper bathyal sediments

机译：在2011年东北太平洋太平洋海岸发生的大范围泥沙事件对居住在上海底沉积物中的底栖原核生物和中生动物的影响

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We examined the effects of mass sedimentation events caused by the 2011?off the Pacific coast of Tohoku Earthquake on abundances and vertical distributions of prokaryotes and metazoan meiofauna in sediments, using sediment cores collected from eight bathyal stations off Tohoku 1?year after the M9.0 earthquake. Event deposits 1–7?cm thick were observed at the topmost part of the sediment cores at all sampling stations. At some stations, prokaryotic cell abundances were lower in the surface event-deposit layers compared to those in deeper sediments. These variations were explained by environmental parameters such as a dimensionless sorting factor and mean grain size, suggesting that turbidite sedimentation affected prokaryotic cell abundances. Nematodes had anomalously higher subsurface abundances at the stations where subsurface peak prokaryotic cell numbers were observed, whereas copepods always showed peak densities in the sediment surface layer. Although there are no available data for prokaryotic cell abundances and meiofaunal densities before the earthquake from the same sites, it is likely that the subsurface peaks in prokaryotic cell numbers and nematode densities resulted from the sedimentation events. The effects of sedimentation events on the organisms were observed 1?year after the earthquake, indicating that episodic sedimentation events on scales of several centimeters have a large effect on small organisms inhabiting sediments.
机译：我们使用了M9之后1年后从东北北部8个深海站收集的沉积物核，研究了2011年东北地震太平洋海岸引起的大规模沉积事件对沉积物中原核生物和后生动物动物群的丰度和垂直分布的影响。 0级地震。在所有采样站的沉积物核心的最上部都观察到了1–7？cm厚的事件沉积物。在某些站点，表面事件沉积层中的原核细胞丰度低于较深沉积物中的原核细胞丰度。这些变化由环境参数解释，例如无因次排序因子和平均粒度，这表明浊积石沉淀影响原核细胞丰度。线虫在观察到地下峰值原核细胞数量的站处异常高的地下丰度，而co足类动物总是在沉积物表层显示峰值密度。尽管在同一地点尚无地震前原核细胞丰度和系膜密度的可用数据，但很可能是沉积事件导致了原核细胞数量和线虫密度的地下峰值。地震发生1年后，观测到沉积事件对生物的影响，这表明几厘米规模的偶发性沉积事件对居住在沉积物中的小型生物影响很大。

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