Combined effect of diazepam and polystyrene microplastics on the social behavior of medaka (Oryzias latipes)

Yuki Takai, Hideaki Tokusumi, Moeko Sato, Daishi Inoue, Kun Chen, Takumi Takamura, Shintaro Enoki, Yu Ueno, Ik Joon Kang, Yohei Shimasaki, Xuchun Qiu, Yuji Oshima

研究成果: ジャーナルへの寄稿学術誌査読

抄録

The combined effect of microplastics and pharmaceuticals on aquatic organisms is an issue of concern. In this laboratory study, we evaluated the combined effect of polystyrene microplastics (2-μm diameter) and diazepam on the social behavior of medaka (Oryzias latipes) by using the shoaling behavior test with five treatment groups: solvent control, polystyrene microplastics exposure (0.04 mg/L), low-concentration diazepam exposure (0.03 mg/L), high-concentration diazepam exposure (0.3 mg/L), and polystyrene microplastics and low-concentration diazepam co-exposure. After 7 days of exposure, the shoal-leaving behavior of the high-concentration diazepam exposure group (8.9 ± 8.3 counts/medaka) and the co-exposure group (6.8 ± 6.7 counts/medaka) was significantly greater than that in the solvent control group (1.8 ± 2.6 counts/medaka). Even after 5 days of recovery, medaka in the co-exposure group left the shoal more often (7.3 ± 5.0 counts/medaka) than those in the solvent control group (2.6 ± 2.6 counts/medaka), whereas the shoal-leaving behavior in other exposure groups, except for the high-concentration diazepam exposure group, was restored. Our findings show that the combined effects of diazepam and polystyrene microplastics suppressed medaka social behavior, suggesting that the presence of microplastics can enhance the adverse effects of pollutants on the social behavior of aquatic organisms.

本文言語英語
論文番号134403
ジャーナルChemosphere
299
DOI
出版ステータス出版済み - 7月 2022

!!!All Science Journal Classification (ASJC) codes

  • 環境工学
  • 環境化学
  • 化学 (全般)
  • 汚染
  • 公衆衛生学、環境および労働衛生
  • 健康、毒物学および変異誘発

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