抄録
This study aimed to clarify the aquatic fauna in riffles and reveal adult records of aquatic insects in small moun-tain streams, Mizuya Stream and Noto Stream, flowing through Kasuga-yama Primeval Forest in Nara Prefecture. A large number of Gammarus nipponensis and Nemouridae (Nemoura and Amphinemura) nymphs were collected from two streams, nymphs of Baetis thermicus were predominated in both streams. However, the other fauna were fairly different between two streams. In Mizuya Stream, large numbers of Elmidae and Naididae were collected. In Noto stream, some Ephemeroptera species (e.g., Paraleptophlebia japonica, Ameletus montanus, Epeorus cumulus) and Simulidae larvae were predominant in numbers.
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