Abstract Forcipomyia (Lasiohelea) taiwana is a diurnal insect. Its daily activities start in the morning and they reach their peak at noon and in the afternoon. In this study, we measured the action spectrum of the phototactic response of F. taiwana in three time periods: in the morning, at noon and in the afternoon. The results show that the female adults need a relatively high light intensity to elicit their phototactic response in the morning, but require a lower light intensity for their response at noon and in the afternoon, indicating that the female adults are less active in the morning but much more active around noon and in afternoon. The light intensity to elicit the male’s phototactic response was not significantly different in these three time periods. In terms of action spectrum, both male and females are more sensitive to ultraviolet light than to visible light, especially the spectral region between 330 and 340 nm for the females and 370 nm for the males.
摘要 臺灣鋏蠓 (Forcipomyia taiwana) 是日行性昆蟲，族群活動始於每日早晨，中午至下午為活動的高峰。因此本研究分別於早晨、中午及下午等三個不同時段，對臺灣鋏蠓成蟲進行趨光行為之偏好光譜試驗。結果發現，早晨時段雌蟲對光的刺激較不敏感，在中午及下午時段較為敏感；雄蟲則不會因不同時段而產生對光刺激敏感差異性。臺灣鋏蠓成蟲對短波長之紫外光刺激較敏感：雌成蟲之最敏感波長為330～340 nm，而雄成蟲為370 nm，顯示雌、雄蟲皆較偏好紫外光，但有不同的偏好波長。
| Key words: Forcipomyia taiwana, phototaxis, ultraviolet | | 關鍵詞: 臺灣鋏蠓、趨光性、紫外光。 |
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