抄録
It has been reported about aquatic insects in Lake Suwa since the late 1910s. However, few reports of adult caddisflies in this lake have been published to date. The objective of this study was to describe the fundamental information and characteristic about adult caddisflies in Lake Suwa. We tried to clarify the abundance and distribution of adults caddisflies caught by light traps. The abundance of adult caddisflies was monitored every day at the Research and Education Center for Inlandwater Environment, Shinshu University from April to November in 2003 and 2004. Moreover, we also carried out the multipoint sampling surveys at 8 sampling stations on the bank of the lake in June, July and October in 2003 and 2004. The total number of adult caddisflies caught more than 1,000 individual numbers per year. There were large numbers of adult caddisflies in the summer. At 8 sampling stations, we recorded a total of 32 species (16 family, 23 genus). The dominant species was Cheumatopsyche brevilineata (92.0% of the total number of trichopteran communities) and followed by Psychomyia acutipennis (2.9%). At the lake outlet sampling station, the maximum number of C. brevilineata was caught over 26,000 individuals on 28 July 2004.
