2007 Fiscal Year Final Research Report Summary
Vertical distributions of benthic foraminiferal assemblages and mercury in bottom sediments of Minamata and Fukuro Bays
| Project/Area Number |
17340155
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | Kagoshima University |
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Principal Investigator |
OHKI Kimihiko Kagoshima University, University Museum, Professor (90041235)
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| Co-Investigator(Kenkyū-buntansha) |
TAKASHI Tomiyasu Kagoshima University, Faculty of Science, Professor (60217552)
HIDAKA Masayasu Kagoshima University, Faculty of Fisheries, Senior Assistant Professor (20208771)
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| Project Period (FY) |
2005 – 2007
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| Keywords | benthic foraminifera / mercury / pollution / bottom surface sediments / grain size distribution / sea bottom water / Minamata Bay / Fukuro Bay |
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| Research Abstract |
The main purpose of this study is to clarify the relationship between the vertical distributions of benthic foraminiferal assemblages and mercury in sediments of Minamata and Fukuro Bays.
19 core samples were taken from the area, and grain size analysis, mercury analysis and ecological analysis of benthic boraminifera were carried out. As the results, the sedimentary environments hardly showed difference before and after discharge of mercury-contaminated effluent and disposition of bottom sediments containing mercury concentrations higher than 25 ppm in Minamata Bay. The total mercury concentration in surface sediments of cores taken from both bays was relatively high and in the lower layer of cores the concentration decreased with depth and finally showed relatively uniform low native values. In Minamata and Fukuro Bays, only Bulimina denudata in the foraminiferal assemblages abruptly increased at the horizons showing high mercury concentration like the Yatsushiro Sea.
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Research Products
(10 results)
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[Journal Article] 2006, Spatial variations of mercury in Sediment of Minamata Bay, Japan
Author(s)
Tomiyasu, T., Matsuyama, A., Eguchi, T., Fuchigami, Y., Oki, K., Horvat, M., Rajar, R., Akagi, H
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Journal Title
Science of the Total Environment 368
Pages: 283-290
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 2006, Speciation of mercury in bottom water in Minamata Bay
Author(s)
Tomiyasu, T., Matsuyama, A., Eguchi, T., Marumoto, K., Oki, K. Akagi, H
Organizer
8th International Conference on Mercury as A Gloval Pollutant
Place of Presentation
Wisconsin
Year and Date
00000806-11
Description
「研究成果報告書概要(欧文)」より
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