2021 Fiscal Year Final Research Report

Biomagnification mechanism, spatiotemporal trend, and risk assessment of legacy and new environmental pollutants in various aquatic animal species

Research Project

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Project/Area Number	19H01167
Research Category	Grant-in-Aid for Scientific Research (A)
Allocation Type	Single-year Grants
Section	一般
Review Section	Medium-sized Section 64:Environmental conservation measure and related fields
Research Institution	Ehime University
Principal Investigator	Kunisue Tatsuya 愛媛大学, 沿岸環境科学研究センター, 教授 (90380287)
Co-Investigator(Kenkyū-buntansha)	岩田久人愛媛大学, 沿岸環境科学研究センター, 教授 (10271652) 野見山桂愛媛大学, 沿岸環境科学研究センター, 准教授 (30512686) 久保田彰帯広畜産大学, 畜産学部, 准教授 (60432811) 寳來佐和子国立水俣病総合研究センター, その他部局等, 室長 (60512689)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	新規環境汚染物質 / 水圏生物 / 生物濃縮 / 時空間トレンド / リスク評価
Outline of Final Research Achievements	The present study determined contamination levels of persistent organic pollutants (POPs) in oysters collected throughout the seacoast of Okinawa, Japan and higher concentrations of POPs, except hexabromocyclododecanes (HBCDs), were found in oysters from southwestern populated areas. On the other hand, HBCDs showed the highest concentration in a northern rural site with less human and industrial activities, and this result could be due to micronized polystyrene foam particles containing HBCDs as the potential source. Bivalves, saurels and finless porpoises, a higher trophic level species in Seto Inland Sea, inhabiting Osaka Bay, compared with other Seto Inland Sea regions, showed higher POP levels, especially polychlorinated biphenyls (PCBs). In addition, this study revealed relatively higher concentrations of lower brominated dibenzo-p-dioxins (LBDDs) in bivalves from Seto Inland Sea and toxic effects of LBDDs for zebrafish embryos, for the first time.
Free Research Field	環境化学
Academic Significance and Societal Importance of the Research Achievements	微細化された漂着発泡ポリスチレンが沿岸域に生息する野生生物の潜在的なHBCDs汚染源になることを示したデータは、海洋プラ問題に対し貴重な化学的知見と成り得る。また、瀬戸内海の栄養段階が異なる水圏生物へのポリ塩化ビフェニル(PCBs)曝露の継続を示した成果は、PCBs特措法の効果を検証する必要性を提起した。さらに、POPs条約で規制された臭素系難燃剤の代替で使用されているリン酸エステル系難燃剤およびin vivo試験で毒性発現が認められた低臭素化ダイオキシン汚染の進行を瀬戸内海沿岸で初めて明らかにし、POPs条約等の関連国際機関のニーズに資する生態系保全施策上の有用な基礎情報を提示できた。