A5060906564- Coral and Marine Ecosystems Studies
- Geology and Paleoclimatology Research
- Marine and coastal plant biology
- Geological and Geophysical Studies
- Marine and fisheries research
- Cephalopods and Marine Biology
- Geological and Geochemical Analysis
- Coastal wetland ecosystem dynamics
- earthquake and tectonic studies
- Ocean Acidification Effects and Responses
- Marine animal studies overview
- Marine Bivalve and Aquaculture Studies
- Methane Hydrates and Related Phenomena
- Climate variability and models
- Calcium Carbonate Crystallization and Inhibition
- Coastal and Marine Management
- Marine Sponges and Natural Products
- Oceanographic and Atmospheric Processes
- Ichthyology and Marine Biology
- Paleontology and Stratigraphy of Fossils
- Geological formations and processes
Japan Agency for Marine-Earth Science and Technology
2010-2022
Hokkaido University
2008-2019
Toho University
2016-2018
The University of Western Australia
2015
Hokkaido University of Science
2013
To evaluate the relationships between coral calcification, thermal stress, and sedimentation eutrophication linked to human impact (hereafter referred as "land development") by river discharge, we analyzed growth characteristics in context of a paleoenvironment that was reconstructed from geochemical signals modern fossil (1.2 cal kyr BP 3.5 BP, respectively) massive Porites corals Nagura Bay ("Nagura") estuary Todoroki River, Shiraho Reef ("Todoroki"). Both sites are on Ishigaki Island,...
Previous studies have not demonstrated the estimate errors in growth parameters (skeletal density, extension rate and calcification rate) for massive coral skeletons. In order to discuss variability of skeletal growth, it is crucial quantitative evaluation with errors. We report protocol calculating as combined standard uncertainty density (uρSA) based on ISO/IEC Guide 98–3 (2008). applied non-destructive transparent X-ray 2-D imaging scanner, TATSCAN-X1, which enabled quick analysis uρSA...
温帯域の造礁性サンゴは地球温暖化や海洋酸性化の影響を敏感に反映し，骨格に記録していることが期待される。温帯域に生息する造礁性サンゴ骨格を用いた古環境復元の可能性を検討するため，高知県土佐清水市竜串湾において塊状のPorites...
Abstract This study focuses on Okinawa and Yoron islands, in order to better understand tectonics the Ryukyu Arc related subduction zone. We used coral microatolls—known for their centimetric accuracy record of relative sea‐level (RSL) changes—to reconstruct RSL changes over last century from living microatolls. A fossil microatoll was discuss possible beyond century. The signal consists emergence whose rate varies through time, interrupted by decadal multidecadal periods sudden and/or...
Abstract The seismic hazard related to megathrust earthquakes in the Ryukyus (southern Japan) is poorly constrained as no large earthquake has been reported there. Meiwa tsunami impacted coasts of Yaeyama and Miyako islands 1771 but its origin still debated. Global Navigation Satellite Systems measurements indicate that strain accumulating along plate interface observation period short. It thus crucial gain information on potential megathrust. Ryukyu archipelago are located a tropical region...
熱帯から温帯に生息する造礁性サンゴの骨格は，紫外線を照射するとバンド状に発光する（以後，発光バンドとよぶ）。これまでに，発光原因として，サンゴ骨格を構成する炭酸塩鉱物の微量元素，サンゴ骨格中に含有する有機物（特に腐植物質），骨格構造に起因する空隙（孔隙）等が挙げられている。その中でも，腐植物質は発光の主要因であるとされ，サンゴ骨格中やその周辺環境に存在する腐植物質が研究されてきた。一方，骨格の低密度部位と発光バンド部位が一致することが報告され，発光バンドの発光強度が骨格構造に依存する可能性が指摘されているものの，特定の発光要因の解明には至っていない。発光バンドは過去の降雨や河川の氾濫（洪水）の高時間分解能の環境記録として利用されてきており，サンゴの発光バンドを信頼性の高い古環境指標として用いるために，厳密な発光メカニズムの解明と環境要因との関連性の検討が望まれる。