Aestivo-hibernal reproductive diapause in Drosophila moriwakii: flight as a controlling factor |
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Authors: | N Ichijô K Beppu and M T Kimura |
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Institution: | (1) Zoological Institute, Faculty of Science, Hokkaido University, 060 Sapporo, Hokkaido, Japan;(2) Present address: Akan High-school, Akanchô, 085-02 Hokkaido, Japan;(3) Present address: Institute of Nature Education in Shiga Hights, College of Education, Shinshu University, Shiga-kogen, Yamanouchi-machi, 381-04 Nagano, Japan |
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Abstract: | Drosophila moriwakii Okada & Kurokawa (Diptera; Drosophilidae) generally has only one generation per year and enters aestivo-hibernal reproductive diapause in Sapporo, northern Japan, but a small fraction of the population produced a second generation in summer at a place where breeding resources were abundant. In this species, diapause seems to be controlled by flight activity. When flies were cultured in cages in which they were able to fly freely, they entered diapause irrespective of photoperiod, but they did not do so at long daylengths when cultured in small vials in which they were prevented from flying. Furthermore, flies with wings removed did not enter diapause at long daylengths even if they were cultured in the cages. |
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Keywords: | Aestivo-hibernal reproductive diapause flight photoperiod Drosophila moriwakii |
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