NSFC - Environmental Hydraulics and Water Quality

Poster Abstract

Bacterial Community Composition in Yangtze River Along a 4500-meter Elevation Gradient: The Longest River in China Undergoing the Most Rapid Urban Agglomeration

Wednesday, January 4
10:00 AM - 5:00 PM
Location: ChuLv Hall

The bacterial communities in Yangtze River sediment influenced by natural and anthropogenic factors have far been investigated despite the importance of microorganism as transporter of elements and nutrients. Eight typical sections along Yangtze River, located 1 to 4500 m above sea level, were selected to analyze the spatiotemporal distribution of sedimentary bacteria and relative factors using 16S rRNA Miseq sequencing. Results indicated that, in the phylum level, Proteobacteria was dominant (about 50%) both in summer and winter, followed by Actinobacteria and Chloroflexi. Based on genus and OTU levels, bacterial communities also showed significant urban similarities. A threshold was observed on account of the relationship between elevation and bacterial community, as well as richness. The Proteobacteria increased linearly with increased elevation at higher elevations, while Bacteroidetes decreased linearly. At higher levels, the bacterial richness revealed decline with increased elevations. Linear-regression analysis also illuminated that bacterial richness would increase with increasing people density, while excessive human activities bring inhibition to bacterial diversity. Bacterial richness was significantly positively correlated with pH (p < 0.01), total nitrogen (TN) (p < 0.01) and organic matter (OM) (p < 0.01). Redundancy analysis (RDA) revealed that the contribution of TP to bacterial community variances was the significant at higher elevations whereas anthropogenic activities explained more at lower elevations. Based on views of meta-community, it is vital that elevations largely contributed to bacterial diversity at higher levels, while anthropogenic interference influenced the main community structure in the sediment of Yangtze River.


Keywords: Bacterial diversity, community composition, elevation, urban development, influence factors, Yangtze River

Xiao XIAO.. Zhu

College of Environment, Hohai University, Nanjing, Jiangsu Province

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Bacterial Community Composition in Yangtze River Along a 4500-meter Elevation Gradient: The Longest River in China Undergoing the Most Rapid Urban Agglomeration



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