Abstract
The physiological differences for three bloom-forming cyanobacteria ( Cylindrospermopsis raciborskii, Microcystis aeruginosa, and Aphanizomenon flos-aquae) were investigated. In comparison with M. aeruginosa and A. flos-aquae, C. raciborskii exhibited a significantly higher concentration of carotenoids, higher values in maximum photosynthesis rate ( P m), apparent photosynthetic efficieny ( a), and maximum electron transport rate (ETR max) during the growth period. In addition, higher extracellular alkaline phosphatase activities and lower light compensation point ( I c) were also detected in C. raciborskii ( p < 0.05, ANOVA). Therefore, it is suggested that the higher photosynthetic activities, more effective uptake and utilization to phosphate, and low light requirements might play important roles in the occurrence and invasive behavior of C. raciborskii.
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