2 蝶が互いを見分ける方法(1) [科学]
O-
目標時間 1分24秒
音声
1 The clearest evidence for the role of color in sexual attraction
butterflies comes from studies of species in which males and
among
to mate
females have distinctly different appearances. Obviously,
successfully, individuals must be able to determine whether other
5 conspecific butterflies are of their own or of the opposite sex. The rest,
i. ald
it can be argued, is fine-tuning.
2 A gorgeous butterfly species whose males and females differ in
color is the Little Yellow, Eurema lisa. Both sexes appear an identical
yellow to the human eye, the shade being produced by pigments in
10 the tiny scales that cover the butterflies' translucent wings. Males and
females look quite different to butterflies, however, which perceive light
at wavelengths beyond the human visible range and into the ultraviolet.
Yellow wing scales on the upper surface of the males' wings reflect
ultraviolet light, and those of females do not.
(144 words)
