| Project/Area Number |
16K17819
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Geology
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| Research Institution | Nagoya University |
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Principal Investigator |
Humblet Marc 名古屋大学, 環境学研究科, 特任准教授 (40623616)
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| Research Collaborator |
Maki Toshihiro
Furushima Yasuo
Iryu Yasufumi
Sakamaki Takashi
Sinniger Frédéric
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | Coral reef / Mesophotic habitats / Benthic communities / Seafloor topography / AUV / ROV / Scleractinian corals / Ryukyu Islands / Coral reefs / Mesophotic zone / Sea level change / Geomorphology / Submersible |
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| Outline of Final Research Achievements |
The mesophotic seafloor around the Sekisei Lagoon was surveyed at two sites: site KT (lat. 24.27°, long. 124.08°; 30-110 m), site TN (lat. 24.35°, long. 124.08°; 30-45 m), using robotic submersibles. A new autonomous underwater vehicle (AUV HATTORI) was developed to acquire high-resolution video images of the seafloor. The AUV was equipped with sensors measuring temperature, salinity, and light intensity down to 45 m at both sites. Additional video images were acquired using remotely operated vehicles.
There are differences in coral communities occurring at upper mesophotic depths (30-40 m) between site KT and site TN: low coral cover and taxa comprising Porites and merulinids at site KT, and high coral cover with abundant Leptoseris and Acropora at site TN. In addition, a clear depth zonation was observed at site KT with a transition from coralgal communities to a mixed community at around 60 m. This study also highlights the patchiness of benthic communities at mesophotic depths.
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