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Comprehensive Understanding of Microplastics Inflow Off the Coast of Funabashi
Summary
Researchers conducted continuous monitoring of microplastic (MP) contamination in rivers, sewage, and coastal waters around Funabashi in Tokyo Bay, finding that MP number densities showed high temporal variability and a gradual decreasing trend, with upstream river sources driving contamination that diminished toward the sea as particles settled into bottom sediments, while sewage was also implicated as a contributor to marine MP pollution.
近年注目されるマイクロプラスチック（以下，MPs）は毒性の強い化学物質を吸着し，生物相へ取り込まれることが懸念されている．そこで，本研究では，大都市を背後に持つ東京湾に着目し，河川，下水，海域における継続的なモニタリング結果からMPs汚染の実態を把握した．ここでは，包括的なモニタリングにおいてMPsの個数やサイズを計測し，河川から海域へ連続する動態の把握を目的とした．その結果，船橋周辺では，河川，海域，下水のMPs個数密度は時間変動が大きく，徐々に減少傾向であることが分かった．河川上流が汚染源であると考えられ，下流さらには海域へ向かうにつれてMPs個数密度は減少した．一方で，その途中では多くのMPsが沈降し底質に堆積していることが確認された．また，海域へのMPs汚染に下水が影響している可能性が示唆された．
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