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Characteristics of bacterial community in fog water at Mt. Tai: similarity and disparity under polluted and non-polluted fog episodes

Min Wei,Caihong Xu,Jianmin Chen,Chao Zhu,Jiarong Li,Ganglin Lv

Published 2016 in Unknown venue

ABSTRACT

: Bacteria, widely distributed in atmospheric bioaerosols, are indispensable component in fog water system and play an important role in atmospheric hydrological cycle. However, little is known about the bacterial community dynamics and ecological 15 function, especially under the increasing serious air pollution events in North China Plain. Here we have a comprehensive characterization of bacterial community structure, variation and environmental influence about fog water collected at Mt. Tai under polluted and non-polluted fog episodes from 24 Jul to 23 Aug 2014. Using the Miseq 16S rRNA gene sequencing, the facts that fog water harbored a highly diverse 20 bacterial community and the predominant phyla of Proteobacteria, Bacteroidetes, Cyanobacteria and Firmicutes were investigated. The abundant genera Acinetobacter , Stenotrophomonas , Pseudomonas , and Empedobacter originated from a wide range of habitat included opportunistic pathogenic and functional species, suggesting the bacterial ecological and healthy importance in fog water should be concerned. 25 2 Clustering analysis including hierarchical cluster (Hcluster) and principal coordinate analysis (PCoA) indicated a significant disparity between polluted and non-polluted samples. Potential pathogens were significant group in the polluted samples, whereas a more diverse ecological function group of bacteria were identified in the non-polluted samples using linear discriminant analysis effect size (LefSe). 5 Community structure discrepant performed by redundancy analysis (RDA) indicated PM 2.5 have negative impact on bacteria, playing vital role in shaping microbial community structure. PM 2.5 was possibly associated with different origins and pathways of air mass using source tracking by the backward trajectory and wind analysis, mainly related to the long-term transport combing with local regional 10 emission processes. This work furthered our understanding of bacterial ecological characteristics in the atmospheric aqueous phase, highlighted the potential influence of environmental variables on bacterial community over fog process, which will provide fundamental acquaintance of bacterial community response in fog water under increasing pollution stress.

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