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Distribution Pattern of Aquatic Insects in the Upper and Middle Reaches of the Chikuma River in Central Japan  

Kimura, Goro (Dept. of Applied Biology, Shinshu Univ)
Fukunaga, Yachiyo (Dept. of Applied Biology, Shinshu Univ)
Kimio, Hirabayashi (Dept. of Applied Biology, Shinshu Univ)
Publication Information
Korean Journal of Ecology and Environment / v.37, no.4, 2004 , pp. 394-399 More about this Journal
Abstract
The species composition and abundance of aquatic insects were investigated by light trap in summer, 2002 at three stations in the Chikuma River, Japan's longest river. A total of 3278 adults/day were collected, the great majority (57.5%) of which were Diptera, followed by Trichoptera (35.4%) and then Ephemeroptera (7.1%). The number of collected aquatic insects and their biomass gradually increased towards downstream, whereas the number of species and species diversity index (H') decreased. 36 species (H'= 4.30) of aquatic insects were collected at St. 1, versus 31 species (H'= 2.81) at St. 3. Moreover, the relative abundance of functional feeding groups changed from St. 1 to St. 3, i.e., 'collectors' increased and 'shredders' decreased.
Keywords
aquatic insect; Chikuma River; distribution pattern; functional feeding group; species diversity index (H');
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