Abstract
Abstract Colony formation of Microcystis aeruginosa, a bloom-forming cyanobacteria, is closely associated with algal blooms in eutrophic freshwater systems worldwide. To develop effective methods for controlling excess algal growth, it is important to evaluate mechanisms underlying how M. aeruginosa forms colonies. In this study, extracellular polysaccharides (EPS) was isolated from algal blooms that mainly consisted of the genus Microcystis in eutrophic lakes and powdered EPS was prepared. This powdered EPS was used to control the EPS concentration in culture medium; then, the relationship among EPS, calcium (Ca2+), and colony formation of dispersed unicellular M. aeruginosa was investigated under alkaline conditions (pH 8.0). Experimental data indicated that the addition of powdered EPS (200 mg/L) alone did not induce colony formation of M. aeruginosa cells at pH 8.0, however; high concentration of calcium ion (1,000 mg/L) did contribute to colony formation. Moreover, when both EPS (200 mg/L) and calciu...
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