NDLI: 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

Content Provider	Springer Nature Link
Author	maki, Hidetaka Mochizuki, Tomohiro Kitahashi, Tomo Nuura, Takuro Arai, Kazu Toyofuku, Takashi Tanaka, Gengo Shige, Shuichi Tasumi, Eiji Fujikura, Katsuri Watanabe, Shuichi
Copyright Year	2015
Abstract	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.
Starting Page	113
Ending Page	128
Page Count	16
File Format	PDF
ISSN	09168370
Journal	Journal of Oceanography
Volume Number	72
Issue Number	1
e-ISSN	1573868X
Language	English
Publisher	Springer Japan
Publisher Date	2015-05-09
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Benthic disturbance Prokaryote Meiofauna Virus-like particles Upper bathyal depth Macrofauna Oceanography Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Oceanography

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