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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• 作者：Hidetaka Nomaki ; Tomohiro Mochizuki ; Tomo Kitahashi…
• 关键词：Benthic disturbance ; Prokaryote ; Meiofauna ; Virus ; like particles ; Upper bathyal depth ; Macrofauna
• 刊名：Journal of Oceanography
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：72
• 期：1
• 页码：113-128
• 全文大小：844 KB
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• 作者单位：Hidetaka Nomaki (1)
  Tomohiro Mochizuki (1) (4)
  Tomo Kitahashi (2) (5)
  Takuro Nunoura (1)
  Kazuno Arai (3) (5)
  Takashi Toyofuku (1)
  Gengo Tanaka (1) (6)
  Shuichi Shigeno (1)
  Eiji Tasumi (1)
  Katsunori Fujikura (1)
  Shuichi Watanabe (1)
  
  1. Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan
  4. Earth-Life Science Institute, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ward, Tokyo, 152-8550, Japan
  2. Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8564, Japan
  5. Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan
  3. Graduate School of Science, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba, Chiba, 263-8522, Japan
  6. Center for Marine Environment Studies, Kumamoto University, 6061 Aitsu, Matsushima, Kamiamakusa, Kumamoto, 861-6102, Japan
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Oceanography
  Hydrobiology
  
• 出版者：Springer Netherlands
• ISSN：1573-868X

文摘

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. Keywords Benthic disturbance Prokaryote Meiofauna Virus-like particles Upper bathyal depth Macrofauna