Occurrence of Blue-green Algae and Algal Lytic Bacteria in Lake Biwa

概要

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Seasonal changes of the number of blue-green algae-lysing microbes have been studied in relation to that of bloom-forming blue-green algae at two stations in Southern Lake Biwa in 1985. The numbers of the lytic microbes in surface water were in a range from 10^2 to 10^6 PFUs/ml at Yabase station and from 10^2 to 10^4 PFUs/ml at Shimosakamoto station. The numbers of those in the surface layer of sediment at Yabase and Shimosakamoto stations were in a range from 10^3 to 10^6 PFUs/g wet wt and from 10^3 to 10^5 PFUs/g wet wt, respectively. At both stations, especially at Yabase station, the number of the lytic microbes correlated with chlorophyll a. concentration and with the cell number of Anabaena solitaria. Because bacteria always occupied the majority in the algae-lysing microbes, 8 strains of lytic bacteria were isolated. These 8 strains and the strain of LB-1 isolated from the water at Shimosakamoto station in 1984 were identified as gliding bacteria. All of them indicated strong lytic activities against 5 strains belonging to family Nostocaceae including A. solitaria and one strain of Phormidium tenue belonging to family Oscillatoriaceae, but they were hardly or not able to lyse other blue-green algae, green algae, and bacteria tested. These results suggest that the bloom of A. solitaria in Lake Biwa should be affected by lytic bacteria.
日本微生物生態学会の論文
1987-08-25