琵琶湖及び淀川における全菌数, 生菌数の季節変化

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Seasonal fluctuations in the total and viable numbers of bacteria were investigated at Miidera-oki in Lake Biwa and at Kunijima in the Yodo River in Japan. Totoal bacteria estimated by the 4' 6-diamidino-2-phenylindole (DAPI) direct count method varied in the range of 1.3×10^6-1.4×10^7 cells・ml^<-1> in Lake Biwa and 2.5×10^6-4.0×10^7 cells・ml<-1> in the Yodo River respcetively. The viable bacteria, HNB, which were estimated by the plate count method with agar medium containing a high concentration of organic nutrients were 3.3×10-3.7×10^3 CFU (colony-forming units)・ml^<-1> in Lake Biwa and 1.3×10^4-7.2×10^4 CFU・ml^<-1> in the Yodo River. The viable bacteria, LNB, which were estimated by the same method with agar medium containing a low concentration of organic nutrients were 1.7×10^3-1.0×10^5 CFU・ml^<-1> in Lake Biwa and 7.1×10^4-1.4×10^6 CFU・ml<-1> in the Yodo River respectively. The number of LNB as a percentage of the number of the total bacteria was 2.5% at most in Lake Biwa but 27.4% in the Yodo River. The viable bacteria tended to be more abundant in the Yodo River, which was eutrophic, than in Lake Biwa. The total number of bacteria was not correlated with the biochemical oxygen demand (BOD) or potassium permanganate consumption (KMnO_4-C) at either site. However, the number of LNB was a negatively correlated with the BOD in Lake Biwa and positively so in the Yodo River. In both sites, the numbers of LNB were correlated with KMnO_4-C.
日本微生物生態学会の論文
1990-05-01

琵琶湖及び淀川における全菌数, 生菌数の季節変化

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