Distribution mechanism of dominant genera and species of bacteria under different river velocity

Flow velocity as the basic hydrodynamic condition significantly affects bacterial proliferation and biofilm formation, yet how different flow velocity influences the attachment and distribution of dominant bacteria in different ecological types is poorly understood. In this work, We collected samples from the bottom, side walls and water samples at the flow rates of 0.794m/s and 0.538m/s, respectively. Through high-throughput sequencing identification and analysis technology, it was found that the composition abundance of Acinetobacter and Psychrobacter, as dominant bacteria, could reach 70%-80% in the floating state, and the attached bacteria at low flow rates were about 20% higher than those at high flow rates. The results showed that the high flow rate inhibited the attachment behavior of dominant bacteria and changed the species composition structure in the overlapping area of multiple samples, which provided a new direction for the prevention and control of microbial corrosion and pollution in waters.