摘要：A total of 1,096 adult craneflies was collected with light traps in the upper and middle reaches of the Shinano River. We identified 13 genera and 23 species belonging to two subfamilies (Limoniinae, 17 species; Tipulinae, six species). The most abundant genus was Tipula (four species), followed by Antocha and Dicronomyia (three species each). The dominant species was Antocha bifida, comprising 83.3% of all individuals collected. From the upper reaches toward the middle reaches, the number of individuals collected decreased, the index of diversity diminished, and the percentage of Tipulinae deceased. Within the genus Tipula, it appeared that there was multidimensional habitat segregation among species.
