Long-term chnages in coral-reef ecosystem after historic times, based on sediment cores

• Project/Area Number: 25340060
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental impact assessment
• Research Institution: University of the Ryukyus
• Principal Investigator: Fujita Kazuhiko 琉球大学, 理学部, 教授 (00343377)
• Co-Investigator(Renkei-kenkyūsha): ASAMI Ryuji 琉球大学, 理学部, 准教授 (00400242) ; YASUMOTO Jun 琉球大学, 農学部, 助教 (70432870)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2015: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2013: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
• Keywords: 堆積物コア / サンゴ礁生態系 / 人為影響 / 生態系長期変遷 / 有孔虫

Outline of Final Research Achievements

Coral reef ecosystems are now being threatened by global environmental changes and human impacts. However, it is still argued that when and how increasing human populations historically affect coral reef ecosystems. We conducted geochemical and micropaleontological analyses of sediment cores drilled from the reclaimed areas of Naha City (Okinawa Prefecture, Japan), where pristine coral reefs had been reclaimed. Results showed that Holocene sediments consisting mainly of bioclastic carbonate sand and mud increasingly contained terrigenous siliciclasts in the upper part of cores, and that some cores potentially record historical changes in terrigenous sediment inputs into coral reef environments, starting from periods of Gusuku and Ryukyu Kingdom.

Research Products

• [Journal Article] Buried fossil microatolls off the Kaichu-Doro Causeway, between Okinawa and Henza Islands (2015)
  • Author(s): Fujita, K., Hongo, C., Koutoku, M., Ito, S., Asami, R., and Reimer, J.D.
  • Journal Title: Fauna Ryukyuana Volume: 24 Pages: 13-15
  • NAID: 120006407197
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] サンゴ化石から推定される沖縄島西岸域の完新世サンゴ礁環境 (2016)
  • Author(s): 善村夏実, 浅海竜司, 嶺井翔伍, 本郷宙軌, 藤田和彦
  • Organizer: 日本古生物学会
  • Place of Presentation: 京都大学，京都
  • Year and Date: 2016-01-29
• [Presentation] 那覇市埋立地下の堆積物コアを用いた人為影響下におけるサンゴ礁環境の長期変遷 (2015)
  • Author(s): 藤田和彦, 本郷宙軌, 川崎裕子, 嶺井翔伍, 佐々木徹
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 幕張メッセ, 千葉
  • Year and Date: 2015-05-27
• [Presentation] 沖縄島のサンゴ礁埋立地下の掘削コアを用いた完新世の海水準記録 (2015)
  • Author(s): 本郷宙軌, 藤田和彦, 川崎裕子, 嶺井翔伍, 佐々木徹
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 幕張メッセ, 千葉
  • Year and Date: 2015-05-27
• [Presentation] 那覇市埋立地下の堆積物コアを用いた人為影響下におけるサンゴ礁生態系の長期変遷の解明 (2015)
  • Author(s): 藤田 和彦，本郷 宙軌，川崎 裕子，嶺井 翔伍，佐々木 徹
  • Organizer: 平成26年度共同利用・共同研究成果発表会
  • Place of Presentation: 高知大学 海洋コア総合研究センター
  • Year and Date: 2015-03-02 – 2015-03-03
• [Presentation] 那覇市埋立地下の堆積物コアを用いた人為影響下におけるサンゴ礁生態系の長期変遷の解明 (2014)
  • Author(s): 藤田 和彦，本郷 宙軌，川崎 裕子，嶺井 翔伍，佐々木 徹
  • Organizer: 日本サンゴ礁学会第17回大会
  • Place of Presentation: 高知城ホール
  • Year and Date: 2014-11-27 – 2014-11-30
• [Book] 琉球列島の自然講座 サンゴ礁・島の生き物たち・自然環境 (2015)
  • Author(s): 琉球大学理学部「琉球列島の自然講座」編集委員会
  • Total Pages: 208
  • Publisher: ボーダーインク