Size-dependent chronic toxicity of fragmented polyethylene microplastics to Daphnia magna

An, D.; Na, J.; Song, J.; Jung, J.

doi:10.1016/j.chemosphere.2021.129591

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Size-dependent chronic toxicity of fragmented polyethylene microplastics to Daphnia magna

An, D.;
Na, J.;
Song, J.;
Jung, J.

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WEB OF SCIENCE

171

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SCOPUS

194

초록

Fragmented microplastics (MPs) are emerging contaminants in freshwater environments; however, long-term assessment of their toxicity remains limited. This study aimed to evaluate and compare the chronic toxicity (21 d) of synthesized polyethylene MP fragments and commercial polyethylene MP beads to Daphnia magna. Ingestion of small- and large-sized MP fragments (17.23 ± 3.43 and 34.43 ± 13.09 μm, respectively) by D. magna was significantly (p < 0.05) higher, by 8.3 and 5.2 times, respectively, than that of MP beads (39.54 ± 9.74 μm). The survival of D. magna exposed to small- and large-sized MP fragments (20 and 60%, respectively) was significantly (p < 0.05) lower than that of individuals exposed to MP beads (90%). In particular, small-sized MP fragments significantly (p < 0.05) reduced algal feeding (from 95% to 76%), body length (from 4.20 mm to 3.98 mm), and the number of offspring (from 109 to 74) in D. magna, when compared with MP beads, likely due to their longer retention time and greater interference in the digestive tract. These findings suggest that fragmentation of MPs into μm-scale particles can pose a significant ecological risk to aquatic organisms; moreover, further studies are required to identify the underlying toxicity mechanism. © 2021 Elsevier Ltd

키워드

Daphnid; Feeding rate; Fragmentation; Microplastic; Mortality; Reproduction; Aliphatic compounds; Aquatic organisms; Microplastic; Polyethylenes; Chronic toxicity; Digestive tract; Ecological risks; Emerging contaminant; Freshwater environments; Retention time; Size dependent; Toxicity mechanisms; Toxicity; microplastic; polyethylene; plastic; polyethylene; adult; animal experiment; Article; basic reproduction number; body height; chronic toxicity; controlled study; Daphnia magna; data analysis software; digestion; Fourier transform infrared spectroscopy; growth rate; ingestion; nonhuman; retention time; scanning electron microscopy; survival rate; toxicity testing; analysis; animal; Daphnia; toxicity; water pollutant; Daphnia magna; Animals; Daphnia; Microplastics; Plastics; Polyethylene; Water Pollutants, Chemical

제목: Size-dependent chronic toxicity of fragmented polyethylene microplastics to Daphnia magna

저자: An, D.; Na, J.; Song, J.; Jung, J.

DOI: 10.1016/j.chemosphere.2021.129591

발행일: 2021-05

유형: Article

저널명: Chemosphere

권: 271