Vertical distributions of benthic foraminiferal assemblages and mercury in bottom sediments of Minamata and Fukuro Bays

• Project/Area Number: 17340155
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Stratigraphy/Paleontology
• Research Institution: Kagoshima University
• Principal Investigator: OHKI Kimihiko Kagoshima University, University Museum, Professor (90041235)
• Co-Investigator(Kenkyū-buntansha): TAKASHI Tomiyasu Kagoshima University, Faculty of Science, Professor (60217552) ; HIDAKA Masayasu Kagoshima University, Faculty of Fisheries, Senior Assistant Professor (20208771)
• Project Period (FY): 2005 – 2007
• Project Status: Completed (Fiscal Year 2007)
• Budget Amount: ¥6,380,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥180,000); Fiscal Year 2007: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2006: ¥500,000 (Direct Cost: ¥500,000); Fiscal Year 2005: ¥5,100,000 (Direct Cost: ¥5,100,000)
• Keywords: benthic foraminifera / mercury / pollution / bottom surface sediments / grain size distribution / sea bottom water / Minamata Bay / Fukuro Bay / 水銀汚染 / 海底堆積物 / 南部八代海 / 粒度組成 / ベントス

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.

Research Products

• [Journal Article] 水俣湾・南部八代海に排出された水銀の現状と底生有孔虫の動向に関する予察的研究 (2007)
  • Author(s): 大木 公彦
  • Journal Title: MRC研究発表会、講演要旨 Pages: 38-39
• [Journal Article] 南部八代海の海底表層堆積物の挙動と水銀汚染 (2006)
  • Author(s): 大木 公彦・Rifardi・冨安 卓滋
  • Journal Title: 月刊海洋 38 Pages: 105-111
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Spatial variations of mercury in sediment of Minamata Bay,Japan (2006)
  • Author(s): Tomiyasu, T., Oki, K., et. al.
  • Journal Title: Science of the Total Environment 368 Pages: 283-290
  • Description: 「研究成果報告書概要(和文)」より
  • Peer Reviewed
• [Journal Article] Spatial variations of mercury in sediment of Minamata Bay, Japan (2006)
  • Author(s): Takashi Tomiyasu
  • Journal Title: Science of the Total Environment 368 Pages: 283-290
• [Journal Article] Speciation of mercury in bottom water in Minamata Bay (2006)
  • Author(s): Takashi Tomiyasu
  • Journal Title: Eighth International Conference on Mercury as a Global Pollutant, abstracts Pages: 481-481
• [Journal Article] 南部八代海の海底表層堆積物の挙動と水銀汚染 (2006)
  • Author(s): 大木 公彦
  • Journal Title: 月刊 海洋 38・2 Pages: 105-111
• [Journal Article] 2006, Migration of bottom surface sediments and mercury-contaminated effluent in the South Yatsushiro Sea (in Japanese)
  • Author(s): Oki, K., Rifardi, Tomiyasu, T
  • Journal Title: Kaiyo Monthly 38, (2) Pages: 105-111
  • Description: 「研究成果報告書概要(欧文)」より
• [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
  • 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
• [Journal Article] Spatial Variations of Mercury in Sediment of Minamata Bay, Japan
  • Author(s): Takashi Tomiyasu
  • Journal Title: Science of the Total Environment (In press)
• [Presentation] 水俣湾・南部八代海に排出された水銀の現状と底生有孔虫の動向に関する予察的研究 (2007)
  • Author(s): 大木 公彦・図師 聖士・冨安 卓滋
  • Organizer: MRC研究発表会
  • Place of Presentation: 北海道大学、札幌
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] Speciation of mercury in bottom water in Minamata Bay (2006)
  • Author(s): Tomiyasu, T., Oki, K., et. al.
  • Organizer: 8th International Conference on Mercury as a Gloval Pollutant
  • Place of Presentation: Wisconsin
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] Relationship between sediments,benthic foraminifera and mercury in the South Yatsushiro Sea,Kyushu,Japan (2006)
  • Author(s): Oki, K., Rifardi and Tomiyasu, T.
  • Organizer: 17th International Sedimentological Congress
  • Place of Presentation: Fukuoka
  • Description: 「研究成果報告書概要(和文)」より
• [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
  • Description: 「研究成果報告書概要(欧文)」より
• [Presentation] 2006, Relationship between sediments, benthic foraminifera and mercury in the South Yatsushiro Sea, Kyushu, Japan
  • Author(s): Oki, K., Rifardi, Tomiyasu, T
  • Organizer: 17th International Sedimentological Congress
  • Place of Presentation: Fukuoka
  • Description: 「研究成果報告書概要(欧文)」より
• [Presentation] 2007, Preliminary study for distribution of discharged mercury and benthic foraminifera in Minamata Bay and the South Yatsushiro Sea (in Japanese)
  • Author(s): Oki, K., Zushi, S., Tomiyasu, T
  • Organizer: MRC Congress
  • Place of Presentation: Hokkaido Univ., Sapporo
  • Description: 「研究成果報告書概要(欧文)」より