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Study of reef biota and sediment distribution in the South Ryukyus and application to paleoenvironmental interpretation of Quaternary fossil reef deposits

Research Project

Project/Area Number 18K03824
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 17050:Biogeosciences-related
Research InstitutionNagoya University

Principal Investigator

Humblet Marc  名古屋大学, 環境学研究科, 准教授 (40623616)

Project Period (FY) 2018-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
KeywordsCoral reef / Ryukyu Islands / AUV / ROV / Mesophotic / Quaternary / Sea level change / Environmental change / Sea-level change / Vertical reef accretion / Fossil coral communities / Okinawa / Great Barrier Reef / Holocene / Core study / Coral reefs / Mesophotic habitats / Benthic communities / Seafloor topography / Mesophotic zone / Quaternary reef deposits
Outline of Final Research Achievements

In this study, two main research themes were investigated: (1) the nature and distribution of marine organisms and sediments in coral reef ecosystems in deep (>30 m) mesophotic settings, and (2) Quaternary reef growth and sea-level history. To address the first research theme, a new lightweight autonomous underwater vehicle (AUV) was successfully tested at three sites around the Sekisei Lagoon, southern Ryukyu Islands. Additional seafloor images were acquired at six sites by remotely operated vehicles (ROVs). The surveys were conducted at depths of 30-70 m and revealed significant differences in benthos and bottom topography among the surveyed sites. To address the second theme, research was conducted on (1) late Middle Pleistocene limestones of the Minatogawa Formation in southern Okinawa-jima, (2) Holocene raised coral reef terraces of Kodakara-jima in the North Ryukyus, and (3) a late Quaternary submerged fossil reef in eastern Australia.

Academic Significance and Societal Importance of the Research Achievements

This research led to a better understanding of the distribution and composition of reef organisms at mesophotic depths in the South Ryukyus, to the development of a new AUV, and shed light on Quaternary reef growth and sea-level history in the Ryukyu Islands and the Great Barrier Reef of Australia.

Report

(6 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (10 results)

All 2022 2021 2020 2019 2018

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 4 results) Book (1 results)

  • [Journal Article] Reef growth history at intermediate to mesophotic depths since the end of the Last Glacial period along the Great Barrier Reef shelf edge2022

    • Author(s)
      HUMBLET, M., WEBSTER, J.M., YOKOYAMA, Y., BRAGA, J.-C., FUJITA, K., IRYU, Y., FALLON, S.J., and THOMPSON, W.G.
    • Journal Title

      International Association of Sedimentologists Special Publication

      Volume: 49 Pages: 189-214

    • DOI

      10.54780/iassp49/07

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Wide-Area Three-Dimensional Imaging of Mesophotic Coral Reefs Using a Low-Cost AUV2022

    • Author(s)
      NOGUCHI, Y., HUMBLET, M., FURUSHIMA, Y., ITO, S., AND MAKI, T.
    • Journal Title

      Marine Technology Society Journal

      Volume: 4 Issue: 4 Pages: 74-89

    • DOI

      10.4031/mtsj.56.4.4

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Low-Altitude and High-Speed Terrain Tracking Method for Lightweight AUVs2018

    • Author(s)
      Maki, T., Noguchi, Y., Kuranaga, Y., Masuda, K., Sakamaki, T., Humblet, M., and Furushima, Y.
    • Journal Title

      Journal of Robotics and Mechatronics

      Volume: 30 Issue: 6 Pages: 971-979

    • DOI

      10.20965/jrm.2018.p0971

    • NAID

      130007535810

    • ISSN
      0915-3942, 1883-8049
    • Year and Date
      2018-12-20
    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] ROV and AUV seafloor imaging at mesophotic depths in the South Ryukyus, Japan2021

    • Author(s)
      Humblet, M., Maki, T., Furushima, Y., Noguchi, Y., Horimoto, H., Sakamaki, T., Ito, S., and Suzuki, S.
    • Organizer
      14th International Coral Reef Symposium
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Study of late Middle Pleistocene reef growth history and relative sea-level change in Okinawa, Ryukyu Islands, Japan2021

    • Author(s)
      Tomatsu. R., Humblet. M., Fujita, K., Kouketsu, Y., and Iryu, Y.
    • Organizer
      14th International Coral Reef Symposium
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Meta-analysis of Holocene reef growth dynamics in Japan2021

    • Author(s)
      Ono, S. Humblet, M., Iryu, Y., and Yokoyama, Y.
    • Organizer
      24th annual conference of the Japanese Coral Reef Society
    • Related Report
      2021 Research-status Report
  • [Presentation] Spatio-temporal variations in fossil coral assemblages in late Middle Pleistocene limestones of the Minatogawa Formation, southern Okinawa-jima, Japan2020

    • Author(s)
      Riho Tomatsu, Marc Humblet, Kazuhiko Fujita, Yui Kouketsu, and Yasufumi Iryu
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Wide area seafloor imaging by a low-cost AUV2020

    • Author(s)
      Yukiyasu Noguchi, Takashi Sakamaki, Shohei Ito, Marc Humblet, Yasuo Furushima, and Toshihiro Maki
    • Organizer
      Global Oceans 2020: Singapore U.S. Gulf Coast
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Study of macrobenthic community structure at mesophotic depths in the South Ryukyus based on ROV and AUV seafloor imaging2019

    • Author(s)
      HUMBLET, M., MAKI, T., FURUSHIMA, Y., NOGUCHI, Y., HORIMOTO, H., YATAGAI, H., SAKAMAKI, T., ITO, S. and SUSUKI, S.
    • Organizer
      Japanese Geoscience Annual Meeting
    • Related Report
      2019 Research-status Report
  • [Book] Ryukyu Islands, Japan (in: Mesophotic Coral Ecosystems, Coral Reefs of the World 12)2019

    • Author(s)
      Sinniger, F., Harii, S., Humblet, M., Nakamura, Y., Ohba, H., and Prasetia, R.
    • Publisher
      Springer Nature
    • ISBN
      9783319927343
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2024-01-30  

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