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Effects of Intermittent Fluid Motion on Colony Formation of Microcystis aeruginosa in late Spring Raw Water

The experiment was conducted by a small perspex ring groove, which generated intermittent water flow, under axenic condition and constant temperature and light, to understand the effects of water flow on colony formation of Microcystis aeruginosa in the early spring raw water. The results showed that colony formation of Microcystis aeruginosa were observed in the control group and treatment groups. Colony characteristics in the treatment groups were more significant than in the control group, and the cell number of maximum colony in the treatment groups were 2.6-4 times more than in control group. So, water flow promoted to the colony formation of Microcystis aeruginosa, and colony of Microcystis aeruginosa most easily formed at flow rate of 25cm·s-1. The phenomenon may be the interaction of the polysaccharide produced by algae in light and cell-cell higher contact rate in water flow. There are optimal flow rate of colony formation for too high water flow producing mechanical shear force to reduce colony formation. The represent study provided the scientific basis for revealing colony formation of algae.