[Structure and Distribution Characteristics of Bacterial Community in Boqing River Water]

The structure and distribution of bacterial communities should be influenced by urban and industrial activities. The Boqing River, which flows through towns and a copper tailing reservoir, is an important tributary of Xiaolangdi Reservoir in South Shanxi. In order to clarify the structure and distribution characteristics of the bacterial community in the Boqing River, we collected water samples along the Boqing River. The diversity characteristics of bacterial communities were analyzed, and their relationships with environmental factors were also explored. The results showed that the abundance and diversity of the bacterial community were higher in the downstream than that in the upstream of the river. Both of the parameters first decreased and then increased along the river. The lowest and highest bacterial abundance and diversity existed in the copper tailing reservoir and the site adjacent to the Xiaolangdi Reservoir, respectively. Proteobacteria, Actinobacteriota, Bacteroidota, and Firmicutes were dominant taxa at the bacterial phylum level in the river, and Acinetobacter, Limnohabitans, Pseudoarthrobacter, and Flavobacterium were dominant taxa at the genus level. Acinetobacter had the highest relative abundance in urban water of the river, which was significantly positively correlated with TC. Flavobacterium was significantly correlated with As. Considering its co-occurrence with As, we speculated that As might contribute to the spread of pathogenic bacteria in the study area. The results of this study were of great importance for the assessment of aquatic health under a complex environment.