Studies on the dispersion of flies at winter season

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  • Uemoto Kiichi
    Department of Medical Zoology, Kyoto Prefectural Medical University

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  • 冬季におけるハエの分散飛翔について
  • トウキ ニ オケル ハエ ノ ブンサンヒショウ ニ ツイテ

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Dispersal tests were carried out in suburban areas of Kyoto from Feb.3 to Mar.16, 1959. The materials were collected by trapping at the three dumping places, and were composed of three species of adult flies. Musca vicina, Aldrichina grahami, and Muscina stabulans. They were marked with aniline dyes and were released from the trapping sites in the very day. 32〜35 traps were distributed on four concentric circles at the distances of 50, 100, 200, 400m, from the release point respectively, for the purpose of the recapture. The recapture operations were conducted during 3〜4 days. The temperature measured at the release points at 10 a.m. ranged from 2.3 to 13.0℃. The results obtained were summarized as follows : Musca vicina, Aldrichina grahami and Muscina stabulans were recovered in the trap placed up to the maximum distance, 400m. Percentage of total recaptures in A. grahami and in M. vicina were 3.2% and 0.9% respectively. Percentage of the recaptures of A. grahami were exclusively higher than that of M. vicina on each circle. The rate of marked individuals of the whole flies showed comparatively higher at the traps located on the circle of the distance less than 100m, for both species. It would seem that A. grahmi leaves away from the release point more rapidly than M. vicina. From the results thus obtained, it was shown that M. vicina is likely to assemble in residential districts than in open areas, while A. grahami to congregate in open areas.

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