日光の湖沼の水生菌類

概要

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1. Ecological studies on aquatic Phycomycetes were carried out in the lakes of Volcano Nikko, Tochigi Prefecture, Japan. 2. Large amounts of zoospores of aquatic Phycomycetes were found in the water of Lake Yunoko and Kotokunuma, but were acarce in the other lakes studied. 3. Nine species were obtained from the lake waters of the Nikko Volcanic Group. Pythium sp. was the dominant species and was seen in all lakes. Saprolegnia terrestris, which was isolated from Lake Kirikomiko, was a species new to Japan. 4. The bottom muds of the Nikko Volcanic Group were characterized by the jet black reduced mud, resulting in the removal of oxygen from the contacting water. Aquatic Phycomycetes were very scarce, and Pythium sp. was the only species that was isolated from these black muds. 5. On the basis of the fungus productivity, the lakes of Volcano Nikko were ranged as follows ; Yunoko>Kotokunuma>Tadenoumi>^Kirikomiko_Karikomiko>Chuzenjiko. The fungus productivity of Lake Yunoko, Kotokunuma and Tadenoumi was the same as that of the eutrophic lakes. It was relatively scarce in Lake Karikomiko and Kirikomiko. The zoospore was not seen in the lake water of the central region in Lake Chuzenjiko.
日本生態学会の論文
1961-02-01