磐梯山周辺の湖沼の微生物学的研究

Abstract

The distribution of aquatic Hyphomycetes was studied in the lakes of Volcano Bandai, Fukushima Prefecture, Japan.According to the physico-chemical characters, the lakes are divided into acidotrophic and harmonic types. The lake waters of the former type contain large amounts of mineral acids, while those of the latter contain relatively few acids.The aquatic Hyphomycetes are more prevalent as well as better in quality in the harmonic lakes than the acidotrophic ones. Tricladium gracile var. oxyphilum is distributed only in the acidotrophic lakes, but never in the harmonic ones. Lemonniera aquatica and Anguillospora longissima seem to adapt to the acidotrophic lakes containing large amounts of mineral acids. On the other hand, Articulospora tetracladia, Lunulospora curvula, Tetrachaetum elegans and Triscelophorus monosporus are distributed only in the harmonic lakes.The experiments were carried out in the laboratory on the resistance of the aquatic Hyphomycetes against the acidotrophic water. Tricladium gracile, Lemonniera aquatica and Anguillospora longissima have a high resistibility to the acidotrophic water. These results are in accordance with the observations by the writers in natural lakes.