Abai, MR

6th International Congress of DipterologyThe first record of adult cranefly (Diptera: Tipulidae) inNishina Three LakesKimura, G. (1), K. Shimura (1), K. Oga (1) & K. Hirabayashi (1)(1) Depertment of Applied Biology, Faculty of Textile Science and Technology, ShinshuUniversity, Ueda, Nagano 386-8567, JapanLake Aoki, Lake Nakatsuna and Lake Kizaki, form a chain of lakes, calledthe Nishina Three Lakes. The trophic status of each lake has been differed.Nishina Three Lakes is one of the most intensively investigated lakes inJapan. The aquatic insects fauna and its behavior has been studied in theselakes; macroinvertebrates (Miyadi, 1931; Kitagawa, 1973; Chino, 1975;Hirabayashi and Hayashi, 1994; Yoshida and Uenishi, 2001), Trichoptera(Kawamura, 1918; Iwata, 1927a, 1927b, Yoshida and Uenishi, 2001),Odonata (Kurasta, 1965, 1971), Diptera especially chironomidae (Asakawa,1977; Yasuno et al., 1983; Hirabayashi and Hayashi, 1996; Hirabayashi etal., 1996). However, studies of adult craneflies have never been because ofthe difficulty of species identification. The objective of this study is toclarify species composition and abundance of adult craneflies in NishinaThree Lakes. The abundance of adult craneflies were monitored usinglight traps in May, August and October in 2005 and February in 2006. Wecollected 26 species of adult craneflies in Lake Aoki, 16 species in LakeNakatsuna and 17 species in Lake Kizaki. A total of 39 species werecollected in Nishina Three Lakes. Only 2 species (Antocha bifida andDicranota sp.) were captured from all lakes. Antocha bifida was dominantspecies in Lake Nakatsuna and Kizaki, and Gonomyia incompleta wasdominant species in Lake Aoki. The species number of cranefliesincreased from May to August, decreased from August to February in alllakes. The individual number showed different seasonl trend each lake.Key Words: adult cranefly, light trap, species composition, seasonal trend,different trophic status133