Secondary PVC microplastics are more toxic than primary PVC microplastics to Oryzias melastigma embryos

文献类型： 外文期刊

第一作者： Xia, Bin

作者： Xia, Bin;Sui, Qi;Du, Yushan;Jing, Jing;Zhu, Lin;Zhao, Xinguo;Sun, Xuemei;Chen, Bijuan;Qu, Keming;Xia, Bin;Zhu, Lin;Zhao, Xinguo;Sun, Xuemei;Chen, Bijuan;Du, Yushan;Wang, Liang;Booth, Andy M.;Xing, Baoshan

作者机构：

关键词： Secondary microplastics; Oxygen flow; Teratogenic effects; Hypoxia; Gene expression

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：14.224； 五年影响因子：12.984 ）

ISSN： 0304-3894

年卷期： 2022 年 424 卷

页码：

收录情况： SCI

摘要： Irregular-shaped and partially degraded secondary microplastics (SMP) account for the majority of MPs in marine environments, yet little is known about their effects on marine organisms. In this study, we investigated the embryotoxicity of polyvinyl chloride SMP and primary microplastics (PMP) to the marine medaka Oryzias melastigma. This study aimed to determine the physical impacts of MPs and, for the first time, elucidate the underlying mechanisms of physical toxicity. SMP shortened hatching time and induced higher teratogenic effects on larvae relative to PMP, indicating a higher toxicity from SMP. Physical damage from SMP to the chorion surface appears to be the main toxicity mechanism, caused by their irregular shape and reduced aggregation relative to PMP. In contrast, real-time changes in oxygen demonstrated that hypoxia caused by greater PMP adsorption to the chorion surface contributes to the toxicological responses of this material relative to SMP. Modulation of genes involved in hypoxia-response, cardiac development and hatching confirmed the toxicity mechanisms of PMP and SMP. The chemical contribution to observed toxicity was negligible, confirming impacts derived from physical toxicity. Our findings highlight the negative effects of environmentally relevant SMP on the marine ecosystems.

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