Impacts of the Great East Japan Earthquake on Zostera bed and intertidal flat habitat in Miyagi Prefecture.
| Project/Area Number |
17K00650
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Environmental and ecological symbiosis
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| Research Institution | Ishinomaki Senshu University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
小瀬 知洋 新潟薬科大学, 応用生命科学部, 准教授 (60379823)
坂巻 隆史 東北大学, 工学研究科, 准教授 (60542074)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 東日本大震災 / 藻場 / 干潟 / 流域圏 / 起源解析 / 環境材料 / 生態系影響解析 |
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| Outline of Final Research Achievements |
Zostera habitats (Zostera marina and Zostera caulescens) in the Oshika Peninsula dramatically decreased by the Great East Japan Earthquake of 2011. Z. caulescens habitat recovered in 4.5 - 6.5 years after the earthquake. On the other hand, the density of Z. marina remained at relatively low levels after the event. The low underwater light intensity due to the land subsidence and the discharged turbidity from the river after the earthquake were likely the factors responsible for the sparse density in Z. marina.
After the earthquake, increase in silt content and the eutrophication of sediment at the tidal flat were occurred in Matsushima bay. The settlements of Ruditapes philippinarum larvae were considered to be inhibited by the increase of the silt content of the sediment after the earthquake. Our results suggested that the silt content of sediment was influenced by the fine sediment discharged from coastal construction sites or transportations from the offshore side of the bay.
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| Academic Significance and Societal Importance of the Research Achievements |
東日本大震災のような大規模な撹乱によって，藻場・干潟生態系はどのようなダメージを受け，その後，どう変化したのかについての一端を，本研究により明らかにすることができた。また調査対象とした両地点ともに，周辺域から流入してきた微細な土砂が，水中光量の低下など，これら生態系の回復過程に影響をもたらしたことも示唆することができた。さらに底質中の金属組成比と安定同位体比との併用による，シルト分の起源解析手法の高度化に向けたプラットフォームを得ることができた。
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Report
(4 results)
Research Products
(28 results)
