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Title of Journal: J Oceanogr

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Abbravation: Journal of Oceanography

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Springer Japan

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1573-868X

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Deepsea meiofauna off the Pacific coast of Tohoku

Authors: Tomo Kitahashi Himiko Watanabe Ken Ikehara Robert G Jenkins Shigeaki Kojima Motohiro Shimanaga
Publish Date: 2015/09/21
Volume: 72, Issue: 1, Pages: 129-139
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Abstract

We compared meiofaunal assemblages obtained from the landward slope of the Japan Trench off the Sanriku region of Honshu Island before the 2011 off the Pacific coast of Tohoku Earthquake 45 months and 15 years after the earthquake Sediment samples were collected after the earthquake along two transects Meiofaunal density after the earthquake did not differ from that before the earthquake However meiofaunal composition after the earthquake was different from that before the earthquake and the composition dispersion after the earthquake was lower than that before the earthquake These results suggested that the turbidity current may have affected meiofaunal composition and reduced its variability These changes were probably caused by the seismic motion and displacement of the substratum after the earthquake rather than sediment redeposition induced by the earthquake To assess the effect of the earthquake more thoroughly we compared meiofaunal assemblage in the Sanriku region before and after the earthquake with that in the Kuril Trench comparable productivity to the Sanriku region and Ryukyu Trench lower productivity Differences in meiofaunal composition before and after the earthquake within the Sanriku region were lower than those between the Sanriku and Ryukyu regions These results suggested that deepsea meiofaunal assemblages are influenced by largescale disturbances but changes are within the range of variation generated by surface productivity levelsThe authors are grateful to the officers and crew of the RV Tansei Maru and to the supporting staff from the Atmosphere and Ocean Research Institute AORI the University of Tokyo and the Japan Agency for MarineEarth Science and Technology JAMSTEC We also thank Dr Hidetaka Nomaki JAMSTEC for his valuable suggestions Generic Mapping Tools GMT Wessel and Smith 1995 was used in this study We would like to thank the three anonymous reviewers who provided valuable comments on an earlier draft of the manuscript This research was partly supported by Tohoku EcosystemAssociated Marine Sciences TEAMS from Ministry of Education Culture Sports Science and Technology MEXT

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