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.
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