宇川の付着藻類と水生昆虫 : 1958年の調査から

抄録

In 1958,the algal flora and insect communities were studied in Ukawa, a small river which is situated in the north coast of Kyoto Prefecture and flows into the Japan Sea. The aquatic communities, especially "Ayu" community, of this river have been studied by the members of the Zoological Institute of the Kyoto University since some years. We here report our results of the investigation of the above-mentioned year. 1) The Cyanophyceae, especially Symploca sp. was dominant in both riffle and pool, and was more abundant in the riffle than in the pool. 2) Among the diatoms, Navicula cryptocephala and Cymbella trugidula were found in all stations and were very abundant. 3) The diatoms increased in autumn. 4)IIn general, the net-spinning caddis-worms were rather few in this year. 5) Mataeopsephenus japonicus was found widely and dominantly in the reaches lower than Tanaka. 6) The species constitution of benthic insects was not very different among the stations studied. The number of species was far more in the riffles than in the pools. 7) All stations were distinguished into three groups of stations ; that is (1) Kurokawa, (2) Sukawa, and (3) the region from Tanaka to Onge.