期刊
MARINE POLLUTION BULLETIN
卷 158, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2020.111446
关键词
Medaka; Microplastics; Bioconcentration; Reproduction; Gene expression
资金
- Environmental Research and Technology Development Fund of the Ministry of the Environment, Japan [SII-2-2(2), JPMEERF18S20206]
This study was performed to elucidate the uptake and bioaccumulation of polystyrene microplastics (PS-MPs) in Japanese medaka (freshwater fish) and Java medaka (marine fish), and to assess its impacts on the survival, reproduction, and gene expression of Japanese medaka. Both species were exposed to 2-mu m fluorescent PS-MPs (10(7) beads/L) for 3 weeks. The bioaccumulation factor of PS-MPs for Java medaka was calculated at about 4 x 10(2), higher than that for Japanese medaka (about 1 x 10(2)). The exposure had no significant effects on the survival and reproduction of Japanese medaka. The mRNA sequencing analysis showed that the expression of a few genes involved in the cell adhesion, xenobiotic metabolic process, brain development, and other functions in medaka intestines significantly changed after exposure. These results suggest that virgin PS-MPs can potentially accumulate in medaka intestines, but has limited toxicity to Japanese medaka at the concentration up to 10(7) beads/L.
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