強酸性河川玉川・高松川(秋田県)における藻菌類とその遊走子数の分布

概要

論文の詳細を見る
The Tamagawa and the Takamatugawa are remarkably acidotrophic rivers ; the former is the largest and the latter is medium-sized among the tributaries of the Omonogawa River. The distribution of aquatic Phycomycetes and the amount of their zoospores, which is considered as an indicator of their potential growth, were investigated along the water-course of the Takamatugawa from June 1978 to May 1979 and the Tamagawa from June to December 1979. On the distribution of aquatic Phycomycetes in the Tamagawa, their floras in the upstream regions of the strong acid water (pH 2.7-3.8) were different from those in the downstream regions of the weak acid water (pH 4.6-6.7); i.e., Saprolegnia litoralis was dominant in the upstream regions of the strong acid water, while Achlya flagellata and Saprolegnia diclina were dominant in the downstream regions of the weak acid water. On the other hand, in the Takamatugawa, S. litoralis was dominant in all regions along the water-course (pH 2.6-4.0). S. litoralis is thought to be adapted to strong acid river. The amount of zoospores of aquatic Phycomycetes in these rivers was small in comparison with those in non-acid rivers (pH about 7.0). By tracing seasenal change, it is said that the amount of their zoospores decreases in summer.
日本生態学会の論文
1981-12-30