Abstract
Growth characteristics of two blue-green algae Microcystis aeruginosa and Anabaena spiroides were tested using semi-continuous cultivation at various temperature. M. aeruginosa maintained its cell number under temperature rise, while A.spiroides decreased tremendously. It was assumed that the decrease of A.spiroides was due to its low acclimation ability to temperature rise and decrease in phosphorus uptake. Consequently, increase in water temperature was considered to be one of the factors ofspecies shift from Anabaena to Microcystis in early summer.
