Effects of environmentally relevant concentrations of micro(nano)plastics on aquatic microorganisms:Changes in potential function but not in overall composition  

作　　者：Zhenlu Wang Xianghong Dong Muzi Zhang Lei Gan Jian Shao Weiling Sun 

机构地区：[1]Key Laboratory of Animal Genetics,Breeding and Reproduction in the Plateau Mountainous Region,Ministry of Education,Guizhou University,Guiyang,550025,China [2]College of Animal Science,Guizhou University,Guiyang,550025,China [3]College of Environmental Sciences and Engineering,The Key Laboratory of Water and Sediment Sciences,Ministry of Education,Peking University,Beijing,100871,China

出　　处：《Water Biology and Security》2024年第1期37-45,共9页水生生物与安全（英文）

基　　金：the Science and Technology Project of Guizhou Province,China([2020]4Y027);the National Natural Science Foundation of China(32002392);the Program Foundation for Talents of Guizhou University(No.[2021]15 and No.[2021]65).

摘　　要：Micro(nano)plastics(MNPs)are a growing problem as persistent environmental pollutants.Here,we investigated the impact of MNPs on microorganisms in aquatic microbial floc exposed to NPs(80 nm)and MPs(8μm)for 35 days.Water quality indicators were tested weekly and microbiological analyses were conducted on Day 7 and 28 after exposure.The results showed that there were significant differences in the levels of total ammonia nitrogen or nitrite between the MNPs groups and the control group,spanning from Day 7 to Day 28.For the microbial response,microbial community richness in the NPs and MPs groups were significantly increased at Day 7.Functional prediction showed that the relative abundances of bacteria associated with the“Forms Biofilms”,“Potentially Pathogenic”,“Plastic Degradation”and nitrogen cycle processes were significantly different after MNPs exposure.The results suggest that MNPs had no significant effect on the microbial diversity of mature microbial flocs.Findings suggest MPs could cause an increase in the relative abundance of potentially pathogenic bacteria,while NPs do not.In addition,stress associated with MNPs affected the nitrogen cycle of microorganisms,and NPs exerted greater impacts than MPs.Findings from this study further our understanding of the impact of MNPs at environmentally relevant concentrations on microorganisms in aquatic ecosystems.

关 键 词：NANO-PLASTICS Micro-plastics Aquatic microorganism Pathogenic bacteria Nitrogen cycle 

分 类 号：Q178.1[生物学—水生生物学]