2022 Fiscal Year Final Research Report
Possibility of destruction of microplastics by manila clams
Project/Area Number |
20K21326
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Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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Allocation Type | Multi-year Fund |
Review Section |
Medium-sized Section 40:Forestry and forest products science, applied aquatic science, and related fields
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Research Institution | The University of Tokyo |
Principal Investigator |
Ogawa Nobuhiro 東京大学, 大気海洋研究所, 技術専門職員 (30626536)
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Co-Investigator(Kenkyū-buntansha) |
伯耆 匠二 三重大学, 生物資源学研究科, 助教 (10809354)
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Project Period (FY) |
2020-07-30 – 2023-03-31
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Keywords | マイクロプラスチック / アサリ / 水産無脊椎動物 / 摂餌生態 / 電子顕微鏡 |
Outline of Final Research Achievements |
Marine pollution by marine microplastics has attracted a great deal of social concern, and in recent years, accidental ingestion by many marine organisms and their effects on living organisms have also been evaluated. However, regarding the behavior after being taken into the body, there were still many unclear points such as the possibility of destruction by feeding behavior due to technical problems. In this study, we attempted to elucidate the behavior in the body using manila clams unsig histochemical techniques. As a result, it was shown that clams take in different organs depending on the size of microplastics that they accidentally ingest. In particular, nano-sized plastics are involved in digestion and absorption at the cellular level, indicating the possibility of affecting nutrient absorption. We also discovered the possibility of crushing microplastics in the stomach.
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Free Research Field |
組織学
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Academic Significance and Societal Importance of the Research Achievements |
本研究の完遂によってはじめて、マイクロプラスチックの発生源である沿岸域に生息する海洋生物、特にアサリという歯を持たない濾過食者の摂餌行動であってもマイクロプラスチックがナノ化する可能性があることが示された。理論的には物質は細粒化されるほど有害化学物質の吸着能が高くなる。つまり海洋生物に与える有害性を飛躍的に増大する危険性を孕んでいるといえる。また、マイクロプラスチックの体内動態も明らかになり、海洋汚染による影響評価が高精度に実施できるようになる。今後、マイクロプラスチックの有害性が再認識され、ナノプラスチックによる海洋生態系の影響がより正確に把握されるように展開されることが期待できる。
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