円山川水系(兵庫県)の水生生物群集 I : 上流区, 八木川の底生動物の生態(I)

抄録

1. The River Yagi, the torrential part of the Maruyama River system, may be divided by its river form into two areas, namely upper and lower torrents. Benthic insect communities show two different types in accord with the river forms mentioned above. These are shown in Tables 1 and 2 as well as in Fig. 3. 2. Total standing crops of the main species are very different between the upper and lower torrential areas ; Stenopsycha griseipeknis (Trichoptera) may be responsible principally for this phenomenon. These are shown in Table 3.