@article{884ba1889c66447eb81349910d956d08,
title = "Analysis of environmental and microbiological changes in Onagawa Bay immediately after the tsunami of the Great East Japan Earthquake based on sediment cores",
abstract = "We investigated two sediment cores to understand whether a tsunami in Onagawa Bay, Japan caused environmental changes. The value of δ13C ranged from −21.9‰ to −24.3‰ and of δ15N ranged from 5.1 to 5.9‰. We conclude that the source of the sediment in the present study area was mainly oceanic and not terrestrial. The chlorophyll concentration ranged from 1.8 to 4.0 μg/g ww, and did not vary greatly between surface and bottom layers. We inferred that all layers were deposited after the tsunami. The major phytoplankton taxa in sediments were diatoms from DNA sequencing. The presence of harmful dinoflagellates was minor. The concentrations of several heavy metals decreased slightly after the tsunami. We inferred that heavy metals in sediments were diluted by the tsunami disturbance. The land in Onagawa suffered serious damage, but disturbance of the seabed was much less evident.",
keywords = "Algae, Environmental sciences, Isotope ratios, Marine sediments, Oceanography, Tsunamis",
author = "Yutaka Okumura and Kenji Kaneko and Hiroto Ota and Hiromitsu Nagasaka and Motoyuki Hara",
note = "Funding Information: This research was a corroborative study by the Tohoku National Fisheries Research Institute and Tohoku University. The authors would like to thank Enago (www.enago.com) for the English language review. The work was supported by the Ministry of Education, Culture, Sports, Science and Technology, Japan with respect to the Tohoku Marine Science Project. Funding Information: The work was supported by the Ministry of Education, Culture, Sports, Science and Technology , Japan with respect to the Tohoku Marine Science Project. Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",
year = "2020",
month = aug,
doi = "10.1016/j.marpolbul.2020.111235",
language = "English",
volume = "157",
journal = "Marine Pollution Bulletin",
issn = "0025-326X",
publisher = "Elsevier Inc.",
}