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Responses of Antioxidant Markers and Valve Activity of the Brackish Water Clam Corbicula Japonica Under Single/combined Exposures of Polystyrene Microplastics and Thermal Stress
Summary
Researchers exposed the brackish water clam Corbicula japonica to polystyrene microplastics at 200 μg/L and at two temperatures (20°C and 25°C), finding that thermal stress altered valve activity and antioxidant responses, with warmer temperatures increasing microplastic ingestion and changing oxidative damage patterns.
ヤマトシジミに対するマイクロプラスチック（MP）と熱ストレスの複合影響を評価するために，MP（0, 200μg/L）と水温（20, 25℃）を組合せた計4系に曝露する応答実験を行い，抗酸化力と開閉運動の応答を調べた．水温20℃，MP200μg/Lでは開殻率は減少したが（p<0.05），水温25℃，MP200µg/Lでは増加した（p<0.05）．開殻率の増加によりMPの摂取量も増加したと考えられる．スーパーオキシドジスムターゼとカタラーゼが減少したが（p<0.1），活性酸素吸収能力（ORAC）が増加したため，水温25℃，MP200µg/Lでは，水温20℃，MP200µg/Lのときのような酸化ダメージには至らなかった．開殻率が増加したことで摂餌量も増えたため，ORACの増加に見られたような抗酸化機能が発現したものと考えられた．
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