Seasonal Change in Microbial Algal-Lysing Agents in the Surface Water and the Periphyton of the Tamagawa River
1982 Volume 43 Issue 1 Pages 11-16
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1982 Volume 43 Issue 1 Pages 11-16
Seasonal distribution patterns of algal-lysing agents were studied on the surface water and the Periphyton of the Tamagawa River about once a month from December 1979 to October 1980. The results are summarized as follows :
1) The population density of agents which cause lysis of blue-green algae increased during summer and decreased during winter. The average densities of agents in summer were 100-200 cells·ml-1 for the surface water and 104-105 cells·cm-2 for the periphyton, respectively. 2) The densities of agents which cause lysis of green algae increased periodically and were larger during the spring months than in the summer months. 3) The agents most commonly found in the surface water and the periphyton were amoeba, bacteria and fungi. Amoeba were more abundant in the periphyton than in the surface water.
