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Studies on the distribution and ecology of chironomid midges (Diptera : Chironomidae) in inland climate area : Chironomid midges in Ueda City, Nagano Prefecture, in summer and fall seasons

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  • 内陸性気候地域におけるユスリカ成虫の分布とその生態に関する研究 : 上田盆地における夏期・秋期のユスリカ成虫
  • ナイリクセイ キコウ チイキ ニ オケル ユスリカ セイチュウ ノ ブンプ ト ソノ セイタイ ニ カンスル ケンキュウ ウエダ ボンチ ニ オケル カキ シュウキ ノ ユスリカ セイチュウ

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Abstract

The fauna and distribution of chironomid midges in Ueda City were investigated based on the collections of adults attracted to automatic vending machines at 108 stations in the summer and at 103 stations in the fall of 1997. A total of 3,371 chironomid midges, 1,346 males and 2,025 females, was collected from the stations in both seasons. All of these chironomid midges were classified into 97 species belonging to four subfamilies, i. e., 61 species of Chironominae, one species of Diamesinae, 29 species of Orthocladiinae and six species of Tanypodinae. The most abundant species was Polypedilum nubifer (Skuze), which was collected at 60 stations, followed by Chironomus kiiensis Tokunaga (53 stations), Cricotopus triannulatus (Macquart) (52 stations) and Cryptochironomus albofasciatus (Staeger) (50 stations) in summer. On the other hand, in fall, the most abundant species was Smittia aterrima (Meigen), which was collected at 75 stations, followed by P. convictum (Walker) (52 stations). The collected chironomid midges reflected the environmental condition of the collection site. Thus, the number of species collected in summer was larger than that in fall, and the respective number of terrestrial species was increased in fall. In addition, the fauna of chironomid midges and their distribution patterns in Ueda City changed during both seasons.

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