Abstract

In order to explore the influence of cyanobacterial blooms on the sediment microbial population structure in lake waters, the cyanobacteria bloom of Zhushan Bay in Taihu Lake was taken as the research background. The cyanobacteria bloom situation was forecasted through long-term monitoring, and of the diversity and relative abundance of colonies in surface sediments were analyzed during algal blooms, based on 16s RNA high-throughput sequencing technology. The results revealed the following: (1) the cyanobacteria bloom period concentrated within June-September of each year, especially around the end of July and the beginning of August, in Zhushan Bay of Taihu Lake, and the peak of the cyanobacteria concentration period may still be maintained at approximately 1010 cells/L; (2) during cyanobacteria degradation, secondary pollution can be reduce if salvage can be finished within days after cyanobacteria accumulation; (3) during cyanobacterial blooms, the bacterial communities in surface sediments are mainly composed of Firmicutes (33.45%), Cyanobacteria (30.44%), Proteobacteria (27.17%), and Bacteroidetes (7.2%), but there are significant differences in microbial communities in different periods; (4) during cyanobacteria blooms, the microbial community in sediments participates in the circulation of nutrients through the signal transduction of various proteases, which regulates the metabolic pathway of microorganisms, further affecting the content and distribution of microorganisms in different environments through signal transduction.

Keywords: Cyanobacteria bloom; Degradation; Sediment; Microbial community