Temporal and spatial variation of hermatypic coral assemblages and coral reefs in response to millenial-scale climate changes during the last glacial period

• Project/Area Number: 24540500
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Stratigraphy/Paleontology
• Research Institution: Kanazawa Gakuin University
• Principal Investigator: SASAKI Keiichi 金沢学院大学, 基礎教育機構, 准教授 (50340021)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 造礁サンゴ / サンゴ礁 / サンゴ石灰岩 / ウラン系列年代測定 / 海洋酸素同位体ステージ３～４ / 氷期 / 気候変動 / 喜界島 / 海洋酸素同位体ステージ３ / 古気候変動 / ウラン系列年代 / 生物地理

Outline of Final Research Achievements

To understand how hermatypic corals and coral reefs expanded/shrunk their geographical distribution in response to the millenial-scale climate changes, glacial coral reef deposits were surveyed by shallow drillings in Kikai Island of Ryukyu Islands, located near the northern limit of coral reefs. Lithologic and stratigraphic investigations of these reef deposits with high-presision U-series dating of fossil corals indicate that coral reefs were developed intermittently responding to millenial-scale relative sea level changes at 40-70 kyr B.P. Further, taxonomic studies demonstrated that different coral assemblages including coral species dominated in the modern temperate regions built these reefs.

Research Products

• [Int'l Joint Research] 国立台湾大学地質科学科(台湾)
• [Journal Article] Temporal and vertical distributions of anthropogenic236U in the Japan Sea using a coral core and seawater samples (2016)
  • Author(s): Sakaguchi,A., Nomura,T.,Steier,P., Gloser,R., Sasaki,K., Watanabe,T., Nakakuki,T., Takahashi,Y., Yamano,H.
  • Journal Title: Journal of Geophysical Research Volume: 121 Pages: 4-13
  • DOI: 10.1002/2015jc011109
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A newly discovered submerged reef on the Miyako-Sone platform, Ryukyu Island Arc, Northwestern Pacific (2016)
  • Author(s): Arai, K., Matsuda, H., Sasaki, K., Machiyama, H., Yamaguchi, T., Inoue, T., Sato, T., Takayanagi, H., Iryu, Y.
  • Journal Title: Marine Geology Volume: 373 Pages: 49-54
  • DOI: 10.1016/j.margeo.2016.01.007
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] 喜界島のサンゴ礁段丘 -1998年以降の成果と今後の課題- (2016)
  • Author(s): 佐々木圭一
  • Journal Title: 月刊海洋 Volume: 56 Pages: 9-15
• [Journal Article] 続成作用による腕足動物殻の初生的化学組成の保持・改変の判定基準の見直し (2016)
  • Author(s): 滝澤 護・髙栁栄子・山本鋼志・佐々木圭一・井龍康文
  • Journal Title: 月刊海洋 Volume: 56 Pages: 27-35
• [Journal Article] Subsidence of the Miyako-Sone submarine carbonate platform, east of Miyako-jima Island, northwestern Pacific Ocean (2014)
  • Author(s): Kohsaku Arai, Hideaki Machiyama, Shun Chiyonobu, Hiroki Matsuda, Keiichi Sasaki, Marc Humblet and Yasufumi Iryu
  • Journal Title: Island Arc Volume: 23巻 Pages: 1-15
  • DOI: 10.1111/iar.12051
  • Peer Reviewed
• [Journal Article] Sea-level changes of approximately 62-52 ka reconstructed from subaerial exposure surface based on carbon and oxygen isotopic compositions (2013)
  • Author(s): 南條貴志ほか
  • Journal Title: Jour. Geol. Soc. Japan Volume: 119 Issue: 3 Pages: 155-170
  • DOI: 10.5575/geosoc.2012.0079
  • NAID: 130003363924
  • ISSN: 0016-7630, 1349-9963
  • Peer Reviewed
• [Journal Article] Recent macroids on the Kikai-jima shelf, Central Ryukyu Islands, Japan (2012)
  • Author(s): Davide Bassi, Yasufumi Iryu, Marc Humblet, Hiroki Matsuda, Hideaki Machiyama, Keiichi Sasaki, Shinya Matsuda, Kohsaku Arai, Takahiko Inoue
  • Journal Title: Sedimentology Volume: 59巻 Pages: 2024-2041
  • DOI: 10.1111/j.1365-3091.2012.01333.x
  • Peer Reviewed
• [Journal Article] 浅海性炭酸塩堆積物に基づく氷期の琉球列島北部の海洋環境 (2012)
  • Author(s): 松田博貴ほか
  • Journal Title: 月刊 地球 Volume: 34 Pages: 363-372
• [Presentation] Preliminary results of MC-ICP-MS U-series dating of 50-ka coral reef in Kikai Island, central Ryukyus of Japan (2015)
  • Author(s): Sasaki, K., Watanabe, T., Nakaya, R., Shen, C.-C., Nanjo, T., Matsuda, H., Sugihara, K., Watanabe, T.
  • Organizer: KIKAI international symposium for coral reef sciences 2015
  • Place of Presentation: 喜界町中央公民館
  • Year and Date: 2015-08-22
• [Presentation] 喜界島の上部更新統より産する Kikaithyris hanzawai の炭素・酸素同位体組成および微量金属濃度の個体差 (2015)
  • Author(s): 滝澤護・髙栁栄子・山本鋼志・佐々木圭一・井龍康文
  • Organizer: 日本地球惑星科学連合 2015 年大会
  • Place of Presentation: 幕張メッセ
  • Year and Date: 2015-05-24
• [Presentation] 喜界島湾層産のKikaithyris hanzawai（約70 ka）の炭素・酸素同位体組成による古海洋環境復元 (2015)
  • Author(s): 滝澤護，髙栁栄子，山本鋼志，佐々木圭一，井龍康文
  • Organizer: 日本地質学会東北支部講演会
  • Place of Presentation: 岩手大学工学部
  • Year and Date: 2015-03-07 – 2015-03-08
• [Presentation] Interstadial coral reef developments between 62 and 52 ka in Kikai Island, central Ryukyus of Japan (2014)
  • Author(s): Sasaki, K., Nanjo, T., Matsuda, H., Sugihara, K., Hasegawa, N.
  • Organizer: International Joint workshop on Coral reef environmental earth sciences
  • Place of Presentation: 北海道大学理学部
• [Presentation] Interstadial coral reef developments between 62 and 52 ka in Kikai Island, central Ryukyus of Japan (2012)
  • Author(s): Sasaki, K., et al.
  • Organizer: 34th International Geological Congress
  • Place of Presentation: Brisbane Convention and Exhibition Centre, Queensland, Australia