明るさの変化がキイロショウジョウバエの色選好性に及ぼす影響

概要

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We examined the color preference of Drosophila melanogaster Meigen (Diptera: Drosophilidae) under different illumination conditions. The results of a gray-scale experiment showed that D. melanogaster was attracted to less bright colors, with the highest attraction to black. The preference for black became stronger with an increase in the surrounding illumination; therefore, we suggest that D. melanogaster can see dark regions by recognizing the contrast at the periphery. Moreover, many D. melanogaster flies were attracted to both black and red below 1,500 lx but were not strongly attracted to any specific color under 500 lx, suggesting that the ability of D. melanogaster to differentiate between colors decreases under this illumination condition. Regardless of the illumination, D. melanogaster was attracted to green at a fixed ratio. These results suggest that the most effective method of attracting D. melanogaster under various illumination conditions is to use only black objects or a combination of objects in black and other colors (green or red).