| Project/Area Number |
17H03854
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Aquatic bioproduction science
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| Research Institution | Nagasaki University |
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Principal Investigator |
WADA MINORU 長崎大学, 水産・環境科学総合研究科(水産), 教授 (70292860)
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| Co-Investigator(Kenkyū-buntansha) |
石松 惇 長崎大学, 海洋未来イノベーション機構, 名誉教授 (00184565)
鈴木 利一 長崎大学, 水産・環境科学総合研究科(水産), 教授 (20284713)
松下 吉樹 長崎大学, 水産・環境科学総合研究科(水産), 教授 (30372072)
嶋永 元裕 熊本大学, くまもと水循環・減災研究教育センター, 教授 (70345057)
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| Project Period (FY) |
2017-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2020: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2018: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
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| Keywords | 季節性貧酸素 / 酸性化 / 呼吸 / 閉鎖性内湾 / 化学合成独立栄養細菌 / 貧酸素 / 微生物呼吸 / 細菌呼吸 / 貧酸素化 / 海洋酸性化 / 海洋微生物 |
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| Outline of Final Research Achievements |
In Omura Bay, Nagasaki Prefecture, it is known that dissolved oxygen levels drop from late June each year, and by mid-August the bay is temporarily anoxic. Furthermore, it has been demonstrated that the bay is acidifying at the same time. It was also found that as anoxia progresses, the aragonite saturation of the water near the seafloor drops to about 1.0, which may inhibit the formation of bivalves and other shellfish species. On the other hand, when anoxic conditions were temporarily eliminated by the passage of a typhoon in August and September and returned to anoxic conditions again, the water did not become acidified in step with the decrease in DO. We found that chemosynthetic autotrophs that simultaneously consume DO and CO2 may be involved in the formation of bottom water masses under such conditions.
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| Academic Significance and Societal Importance of the Research Achievements |
国内外を問わず多くの閉鎖的な内湾は貧酸素化することが知られているが、本研究で示したように、それらの海域でも貧酸素化と酸性化が同時に生じている可能性が高く、水産資源の保全の観点から貧酸素と酸性化を同時に監視することの必要性が明確となった。一方、本研究で、化学合成独立栄養細菌の働きによって、貧酸素状態での酸性化が緩和される可能性を始めて示し、化学合成独立栄養細菌の生態学的役割に関する新たな視点を提供した。
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