Massive flights of chironomid midges (Diptera) found on the shoreline of Lake Kawaguchi, Japan during the spring season

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  • 春期, 河口湖周辺域に大量飛来する"不快昆虫"としてのユスリカ成虫に関する研究
  • Massive flights of chironomid midges Di

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Abstract

The species composition and abundance of the chironomid midges were investigated by using a board trap during the period from March to May 1994 at three different stations along the shoreline in the eastern part of Lake Kawaguchi. A total of 38,498 adult midges were collected, the great majority (98.4%) of which were Biwatendipes tsukubaensis Sasa et Ueno. This was followed by Glyptotendipes tokunagai Sasa, (1.1%) and then a very low representation of Chironomus yoshimatsui Martin et Sublette and C. plumosus Linnaeus (0.5%). The dominant species of chironomids which emerged from the littoral region of the lake, however, changed with the month. First, massive emergence of B. tsukubaensis began from mid-March to late April, and then G. tokunagai from late March to early May. From mid-April, C. yoshimatsui emerged and was followed by C. plumosus. Thus, the period in which the four main chironomid species continuously emerged was from mid-March to early May. Therefore, throughout the spring season people living around the lake have the strong impression that the nuisance of chironomid midges has continuously increased and that these are attracted to the light of hotels, houses and some buildings during the breeding season.

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