Zhang Heran, Yang Queping, Liu Jiaju, Sun Fei, Hu Cheng, Shen Nan, Yuan Peng, Gao Hongjie
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing, 100012, China; State Environmental Protection Key Laboratory of Estuarine and Coastal Environment, Chinese Research Academy of Environmental Science, Beijing, 100012, China; College of Water Science, Beijing Normal University, Beijing, 100875, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing, 100012, China.
J Environ Manage. 2025 Aug;389:126177. doi: 10.1016/j.jenvman.2025.126177. Epub 2025 Jun 20.
Does the vector role of invasive species exacerbate the stress risks posed by emerging contaminants during the process of biological colonization? In this study, a 21-day mesocosm experiment was conducted to investigate the effects of polystyrene microplastics (PS) and perfluorooctanoic acid (PFOA) on the invasive potential, photosynthesis, and water purification capacity of the exotic submerged plant Elodea canadensis. The results demonstrated that PS-PFOA composite pollution exhibited significant synergistic toxic effects, primarily by inhibiting photosynthetic efficiency, disrupting nitrogen metabolism, and exacerbating oxidative stress. This study identified a unique compensatory growth mechanism: exposure to PS (10 mg/L) and PFOA (20 μg/L) significantly increased chlorophyll b (20.47 %), carbon uptake (4.69 %), and phosphorus uptake (18.96 %) in E. canadensis, thereby maintaining growth under stress conditions. Furthermore, E. canadensis contributed to pollutant attenuation through synergistic interactions with dominant microbial taxa, indicating adaptive cooperation between plant and microbial communities. The observed increase in TP levels was attributed to enhanced microbial metabolic activity and associated physicochemical processes. These findings highlight previously underexplored adaptive strategies of invasive plants and microbial collaboration under dual-contaminant stress, offering novel insights into the ecological functions of invasive species and their implications for risk assessment and aquatic ecosystem restoration.
入侵物种的载体作用是否会在生物定殖过程中加剧新兴污染物带来的压力风险？在本研究中，进行了一项为期21天的中宇宙实验，以研究聚苯乙烯微塑料（PS）和全氟辛酸（PFOA）对外来沉水植物加拿大伊乐藻的入侵潜力、光合作用和水净化能力的影响。结果表明，PS-PFOA复合污染表现出显著的协同毒性效应，主要通过抑制光合效率、扰乱氮代谢和加剧氧化应激来实现。本研究确定了一种独特的补偿生长机制：暴露于PS（10mg/L）和PFOA（20μg/L）下，加拿大伊乐藻的叶绿素b含量显著增加（20.47%）、碳吸收量增加（4.69%）和磷吸收量增加（18.96%），从而在胁迫条件下维持生长。此外，加拿大伊乐藻通过与优势微生物类群的协同相互作用促进污染物衰减，表明植物和微生物群落之间存在适应性合作。观察到的总磷水平升高归因于微生物代谢活性增强及相关的物理化学过程。这些发现突出了入侵植物在双重污染物胁迫下此前未被充分探索的适应性策略以及微生物协作，为入侵物种的生态功能及其对风险评估和水生生态系统恢复的影响提供了新的见解。
