Temporal dynamics of bacterial biofilms and their relationship with heavy metals on expanded polystyrene microplastics  

作　　者：Qun XIE Yan FENG Xiangrong XU Hengxiang LI Lang LIN Weiqiong YU Guanghui ZHU Nenghao ZHONG Minhua WU Kai ZHANG 

机构地区：[1]Key Laboratory of Tropical Marine Bio-resources and Ecology,Guangdong Provincial Key Laboratory of Applied Marine Biology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China [2]Analytical and Testing Center,Guangdong Ocean University,Zhanjiang 524088,China [3]Sanya Institute of Ocean Eco-Environmental Engineering,Sanya 572000,China [4]Marine Environmental Engineering Center,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China [5]College of Chemistry and Environmental Science,Guangdong Ocean University,Zhanjiang 524088,China [6]School of Basic Medicine,Guangdong Medical University,Zhanjiang 524023,China [7]National Observation and Research Station of Coastal Ecological Environments in Macao,Macao Environmental Research Institute,Macao University of Science and Technology,Macao SAR 999078,China

出　　处：《Journal of Oceanology and Limnology》2025年第2期528-544,共17页海洋湖沼学报(英文)

基　　金：Supported by the Hainan Province Science and Technology Special Fund (No.ZDYF2022SHFZ317);the Guangdong Province Key Laboratory of Applied Marine Biology (No.2023B1212060047);the Program for Scientific Research Start-up Funds of Guangdong Ocean University (No.060302332301)。

摘　　要：Expanded polystyrene (EPS) is a common type of microplastics (MPs) often found in coastal areas especially aquaculture areas.It is considered as an important site for microbial colonization and biofilm formation,as well as a carrier of pollutants like heavy metals.However,the dynamic changes of bacterial communities attached to EPS and their interaction with heavy metals are still poorly unknown.In this study,a one-year field exposure experiment was conducted at an aquaculture farm near Donghai Island,in Leizhou Bay,Zhanjiang,Guangdong,in South China Sea.The bacterial communities attached to EPS MPs were examined by 16S r DNA high-throughput sequencing,and the relationships between bacterial biofilms and heavy metals were explored.The results show that there were notable seasonal variations in the bacterial diversity of EPS MPs.Species biodiversity was the highest in summer and the lowest in winter.The greatest number of bacterial species and lowest level of uniformity were observed in the spring.The bacterial community structure changed with exposure time,and the most significant difference in the 12-month group (P<0.05) was found.The dominant bacterial species attached to EPS MPs were mainly Proteobackteria and Firmicutes at the phylum level,and Pseudomonas and Exiguobacterium were dominant at the genus level.Furthermore,EPS MPs acted as transport carriers for potential pathogenic bacteria.High correlations were found between bacterial species and the total concentration of heavy metals on EPS MPs,as well as their speciation fractions.Different chemical speciation of heavy metals migrated and altered over seasons within biofilms,which would further exacerbate the ecological risks.

关 键 词：microplastic(MP) bacterial community BIOFILM heavy metal speciation fraction 

分 类 号：X52[环境科学与工程—环境工程] X172