Abstract
Effects of physicochemical factors on graze and decomposition ofMicrocystis aeruginosa by Mastigophora, Monas guttulawere determined under bath culture condition. In consideration of a stable pH value and a lower inhibition for the growth ofM.guttula, the concentration of 1/750M phosphate buffer solution was favorable for pH adjustment of the culture broth. M.guttula could effectively graze and decompose the cells ofM.aeruginosa in a widerange of pH 6.0-9.0. Optimum pH value and temperature for the removal ofM.aeruginosawere neutral pH 7.0 and 30.2°C, respectively. Activation energy forM.guttulafrom Arrhenius equation was found to be low, the value of which was 8300 cal/mole. It was found that conditions of akaline pH 8.0-8.5 and temperature of 20-25°C in the water of Lake Kasumigaura in autumn season were favorable for the graze and decomposition ofM.aeruginosaby M.guttula.
