アメリカシロヒトリ成虫の行動時刻の決定と光条件

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  • Effects of Light Conditions on the Timing of Adult Activities in <i>Hyphantria cunea</i> DRURY (Lepidoptera: Arctiidae)
  • アメリカシロヒトリ セイチュウ ノ コウドウ ジコク ノ ケッテイ ト ヒカリ

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Moving activities (walking and flight) of male and female adults of Hyphantria cunea occurred 1 to 2.5hr after eclosion and again 0.5 to 2hr before sunrise under natural conditions of light at 24.5±1°C, approximately. Moving activities on the next day started about 0.5hr after sunset. The calling pose of females began during the twilight period and ended within 0.5hr after sunrise. The mating began about 0.5hr before sunrise. When females were exposed to light after eclosion, their movements were inhibited. Their movements were triggered by transfer to the natural (dark) conditions, when they had emerged more than 1hr before the transfer; if not, their movements were observed 1.5 to 2hr after adult eclosion. The calling pose began at around sunrise when females had been transferred from light to the natural (dark) conditions 6.5hr but not 2.5hr before sunrise. When females were continuously exposed to artificial dim light (lower than 1lux) after adult eclosion, the calling pose occurred at about 12hr after sunset. When they were first exposed to light (280-300lux) and then to dim light (<1lux), the calling pose was seen at about 12hr after the change in light intensity.

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