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Issue: Vol. 10: 9 August 2016
Type: Article
Published: 2016-08-09
DOI: 10.11646/zoosymposia.10.1.18
Page range: 203–213
Abstract views: 209
PDF downloaded: 153

Flight density of the aquatic insect fauna over the water surface in the middle reaches of the Shinano River, Japan, mainly among caddisflies (Trichoptera)

Division of Applied Biology, School of Science and Technology, Academic Assembly, Shinshu University, Ueda 386-8567, Nagano Prefecture, JAPAN
Division of Applied Biology, School of Science and Technology, Academic Assembly, Shinshu University, Ueda 386-8567, Nagano Prefecture, JAPAN
Institute for Fiber Engineering, Interdisciplinary Cluster for cutting Edge Research, Shinshu University, Ueda 386-8567, Nagano Prefecture, JAPAN
Division of Applied Biology, School of Science and Technology, Academic Assembly, Shinshu University, Ueda 386-8567, Nagano Prefecture, JAPAN
Division of Applied Biology, School of Science and Technology, Academic Assembly, Shinshu University, Ueda 386-8567, Nagano Prefecture, JAPAN
Division of Applied Biology, School of Science and Technology, Academic Assembly, Shinshu University, Ueda 386-8567, Nagano Prefecture, JAPAN
Institute for Fiber Engineering, Interdisciplinary Cluster for cutting Edge Research, Shinshu University, Ueda 386-8567, Nagano Prefecture, JAPAN
flight behavior geographical distribution seasonal change river bed slope species composition sticky board trap

Abstract

We focused on the relative number of flying adult caddisflies on the river surface captured by sticky board traps with the aim of elucidating differences in the distribution pattern of caddisfly larvae along the slope in the middle reaches of the Shinano River. The individual number of adult caddisflies caught increased from April and decreased from October. Even in the same middle reaches of a river, there was a large difference geographically in the species captured. Hydroptila sp. was caught mainly downstream of the Taishyobashi Bridge, Psychomyia acutipennis (Ulmer 1908) in the vicinity of the Taishyobashi Bridge, and Stenopsyche marmorata Navás 1920 upstream of the Awasabashi Bridge. It is known that the slope of the Shinano River bed suddenly becomes less and the flow rate slower in the area from the Taishyobashi Bridge to the Awasabashi Bridge, and it was shown that the species composition and number of aquatic insects caught changes with the change in the slope of the river bed.

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