细菌和古生物群落对河流中可生物降解和不可生物降解的微塑料的不同反应
Yu Liu1, Shuhan Li1, Xinyu Song1
1Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Nankai International Advanced Research Institute (Shenzhen Futian), Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
Journal of hazardous materials
|July 25, 2025
概括
像PLA和PVC这样的微塑料会改变水生微生物群落,影响抗生素耐药性基因的传播. 可生物降解的PLA微塑料可能会对基因传播构成更大的风险,尽管其丰度较低.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 生态毒理学 生态毒理学
背景情况:
- 微塑料是普遍存在的污染物,对水生微生物生态系统的影响研究不足.
- 了解微生物对不同类型的微塑料的反应对于评估生态风险至关重要.
研究的目的:
- 为了比较可生物降解的聚乳酸 (PLA) 和不可生物降解的聚乙烯 (PVC) 微塑料对水生细菌和古生物群落的影响.
- 研究微塑料在抗生素耐药性基因 (ARG) 传播中的作用.
主要方法:
- 进行了为期14天的微观宇宙实验.
- 甲基因组测序被用来分析微生物社区的组成和功能.
- 使用网络分析和基于路径的结构方程建模 (PLS-PM) 来评估微生物相互作用和ARG驱动因素.
主要成果:
- 微塑料选择性地丰富了不同的微生物群落,其中占主导地位的是Pseudomonadota (细菌) 和Euryarchaeota (古生物).
- 塑球微生物网络比周围的水社区更简单,更不连接.
- 无论是PLA还是PVC的微塑料都含有各种ARG,细菌被确定为主要传播者. 在PVC中,ARG的丰度较高,但在PLA中,intI1的表达率较高,这表明ARG传播的可能性更大.
结论:
- 酸和PVC微塑料对水生微生物群落产生不同的影响.
- 微塑料有助于在水生环境中传播抗生素耐药性基因.
- 由于更高的基因表达水平,PLA微塑料可能代表了ARG传播的显著,但被低估的风险.
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