海洋科学2025，Vol.49Issue(8)：53-62,10.DOI:10.11759/hykx20250319002
三种硅藻对微塑料沉降行为的影响研究
Impact of three diatom species on the settling behaviors of microplastics in the seas
摘要
Abstract
The vertical transport of microplastics(MPs)in marine environments is influenced by various biological factors.However,the mechanisms underlying the phytoplankton-mediated settling behaviors of MPs remain poorly understood.This study combined microscopic observations with simulations to investigate the effects of the plank-tonic diatom Chaetoceros gracilis and the benthic diatoms,Nitzschia sp.and Navicula sp.,on aggregate formation and settling behavior in MPs.These included buoyant polypropylene MPs(PP-MPs),polyethylene MPs(PE-MPs),and non-buoyant polyamide MPs(PA-MPs).Results demonstrated that both PE-MPs and PP-MPs were encapsulat-ed within dense structures formed by the extracellular polymeric substances secreted by Nitzschia sp.and Navicula sp.Diatom colonization significantly increased the density of PE-MPs,while PA-MPs exhibited the maximal set-tling velocity with C.gracilis treatment.The MPs-biofouling model developed in this study revealed that biofilm density critically influences the settling patterns of MPs.These findings elucidate the regulatory mechanisms un-derlying the effects of diatom-mediated bio-aggregation on the sedimentation patterns of marine MPs,providing theoretical foundations for understanding the coastal transport dynamics of MPs.关键词
硅藻/微塑料/沉降行为/胞外聚合物/生物膜Key words
diatoms/microplastics/settling behavior/extracellular polymeric substances/biofilm分类
资源环境引用本文复制引用
王东雨,滕佳,孙超凡,王小丹,郭建军,李嘉旭,王清..三种硅藻对微塑料沉降行为的影响研究[J].海洋科学,2025,49(8):53-62,10.基金项目
国家自然科学基金(42176161) the National Natural Science Foundation of China,No.42176161 （42176161）
