College of Environment, Zhejiang University of Technology, Hangzhou, 310014, China.
Bull Environ Contam Toxicol. 2021 Oct;107(4):610-615. doi: 10.1007/s00128-020-02956-0. Epub 2020 Jul 31.
In recent years, microplastics and nanoplastics have gained public attention, but their impacts on the freshwater microbial communities is rarely evaluated. In this study, the effects of 1 mg/L nano-sized polystyrene (nPS) and its modified forms (carboxyl-modified and amino-modified nPS) on the structures and functions of freshwater microbial community were determined. The nPS were found to slightly reduce the chlorophyll-a and increase the phycocyanin contents of freshwater microbial communities. Moreover, the richness of the microbial communities temporarily decreased during this process, while their diversity remained uninfluenced by treatment with nPS. Although the three tested nPS types were found to disturb the compositions of both the prokaryotic and eukaryotic communities to some degree, they did not affect the functions of freshwater bacterial communities significantly due to functional redundancy. Our study demonstrated that the ecotoxicities of the nPS itself were found to be lower than what is generally expected.
近年来，微塑料和纳米塑料引起了公众的关注，但它们对淡水微生物群落的影响却很少得到评估。在这项研究中，测定了 1mg/L 纳米级聚苯乙烯（nPS）及其改性形式（羧基改性和氨基改性 nPS）对淡水微生物群落结构和功能的影响。结果发现，nPS 略微降低了淡水微生物群落中的叶绿素-a 含量，增加了藻蓝蛋白的含量。此外，在此过程中，微生物群落的丰富度暂时降低，而 nPS 处理对其多样性没有影响。尽管这三种测试的 nPS 类型在一定程度上干扰了原核和真核生物群落的组成，但由于功能冗余，它们并没有显著影响淡水细菌群落的功能。我们的研究表明，nPS 本身的生态毒性低于普遍预期。
