磐梯湖沼の微生物学的研究 : I 五色沼湖群の水生菌類

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The ecological studies on aquatic phycomycetes were carried out in the Goshikinuma Lake group of Volcano Bandai, Fukushima Prefecture. 1 The lake waters showed strong acidity and contained a large amount of mineral elements, such as SO_4 : 150〜429mg/l, Ca : 64〜195mg/l, Cl : 68〜182mg/l, Fe : 0.01〜1.75mg/l, Mn : 0.1〜2.2mg/l. 2 The zoospore of aquatic phycomycetes was counted 0〜1177/10 cc in the water of the shore and it decreased accompanied with increase of the disharmonic nature of lake waters. The distribution of aquatic fungi closely corresponded to the acidity as well as the amount of mineral component in the water. Saprolegnia monoica var. acidamica, which had high resistance against mineral acids, was found only in the acidotrophic lakes, while Pythium sp. was distributed in neutral lakes and never in acidic ones. 3 There were two types of the vertical distribution of the zoospore of aquatic phycomycetes ; the one was the homogeneous distribution and the other was the stratum distribution. The former appeared during the circulation period, and the latter was found during the stagnation period. The vertical distribution of the zoospore differed with each species. The zoospore of the genus Saprolegnia was distributed only in the surface layer, while that of Aphanomyces and Pythium increased toward the bottom layer. 4 The aquatic phycomycetes was very scarce or none in the bottom mud of acidic lakes, but it was very rich in neutral lakes. 5 According to the fungus productivity, the lakes of the Goshikinuma group were divided into following 3 groups. (a) Yanaginuma group : The fungus productivity was very high as that of the deepeutrophic lakes. (b) Rurinuma group : The fungus production was very poor and it was characterized by the presence of Saprolegnia monoica var. acidamica that adapted to the acidotrophic water. (c) Bishamon-numa group : The fungus was not seen in these lakes.
日本生態学会の論文
1960-08-01

磐梯湖沼の微生物学的研究 : I 五色沼湖群の水生菌類

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