微污染物,特别是抗生素对使用河流流域水平环境DNA的细菌群体的多部门影响
Pedro A Inostroza1, Gerdhard L Jessen2, Feilong Li3
1Department of Biological and Environmental Sciences, University of Gothenburg, Sweden; Institute for Environmental Research, RWTH Aachen University, Germany.
Environmental pollution (Barking, Essex : 1987)
|December 7, 2024
概括
来自农业和城市地区的微污染物减少了河流中的细菌多样性. 细菌群体通过增加污染物降解和抗生素耐药性来适应,影响生态系统服务.
科学领域:
- 环境微生物学环境微生物学
- 生态毒理学 生态毒理学
- 河流生态系统的健康状况
背景情况:
- 细菌群体对环境压力因素表现出不同的反应.
- 分区特定的 (水,生物膜,沉积物) 微生物社区转移受污染类型和程度的影响.
- 人类活动将复杂的微污染物混合物引入水生生态系统.
研究的目的:
- 研究微污染物如何影响阿孔卡瓜河流域的细菌社区结构和功能.
- 评估农业和城市污染对微生物多样性和生态服务的影响.
- 评估细菌群落在不同污染负载下降解污染物的潜力.
主要方法:
- 从水,生物膜和沉积物样本中对细菌16S rRNA基因进行AMPLICON测序.
- 分析不同污染特征的不同地点的细菌社区结构和多样性.
- 微生物群落的相关性与营养水平,抗生素压力和微污染物负载的转变.
主要成果:
- 在受农业影响的地区和高度微污染的城市地区观察到减少的细菌多样性.
- 营养素,抗生素压力和微污染物负载显著解释了沉积物和生物膜中的细菌社区变异性.
- 检测到能够降解有机污染物的细菌 (例如,Nitrospira) 和抗生素耐药基因 (例如,Exiguobacterium,Planomicrobium) 的数量增加.
- 在受农业和废水处理厂排放影响的地区,与生物降解相关的生态系统服务的显著减少.
结论:
- 微污染物显著改变河流环境中的细菌社区结构,功能和相关生态系统服务.
- 细菌群体表现出适应性反应,包括增强降解能力和抗生素耐药性.
- 为全面评估微污染物的生态风险,建议转向有毒压力值 (通过影响信息规范化的环境度) .
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