Selenium (Se), Mercury (Hg) and Physicochemical Properties Co-Mediate the Bacterial Communities in a Typical Collapsed Lake Receiving Se- and Hg-containing Mine Water

Yang, Ruyi; Luo, Linfeng; Zhu, Meng; Zan, Shuting; Guo, Fuyu; He, Yuhuan; Shi, Xiaojing; Zhao, Bing

Selenium (Se), Mercury (Hg) and Physicochemical Properties Co-Mediate the Bacterial Communities in a Typical Collapsed Lake Receiving Se- and Hg-containing Mine Water

2022

Coal mine and coal-fired power plant are the main sources of selenium (Se) and mercury (Hg) for the collapsed lakes derived from mining subsidence. However, whether and how Se and Hg impact the bacterial communities in the artificial aquatic ecosystems is barely known. The bacterial communities, physicochemical properties, and Se/Hg concentrations of the overlying water and surface sediment from Nanhu Lake, a typical collapsed lake in Huaibei city, Anhui province, were characterized through high-throughput sequencing and chemical analysis. The lake was enriched with N and P, and the surface sediment contained extremely high Se (6.90–30.37 mg/kg). The composition and structure of bacterial communities in the overlying water were different from that in the surface sediment. Alpha diversity indices in the surface sediment were higher than that in the overlying water, and they increased with TP, TN, and NH₃-N. Overall, redundancy analysis indicated that Se, Hg, and physicochemical properties co-mediated the bacterial community in Nanhu Lake. The results highlighted the necessity to reduce the input of exogenous nutrients and to reconsider the environmental and health risks of receiving Se- and Hg-containing mine water.

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