Question

What effect does ultraviolet rays have on butterflies?

Answer 1

The ultraviolet signal in butterflies, absorbance, was determined to be governed by pigments called pterins. In wings containing this pigment, the wings are unable to reflect ultraviolet light as well as without the pigment because the pterins absorb the ultraviolet light. Thus, butterflies are able to reflect ultraviolet light as a result of the organization and composition of their wing scales resulting in thin layer constructive interference and can absorb ultraviolet through the action of pterin pigments.

Answer 2

Butterflies, or members of the Papilionoidea superfamily, use two ultravoilet signals, UV reflectance or absorbance as a communication system. The ultraviolet region is the part of the electromagnetic spectrum between 10 nm and 400 nm in wavelength. Sensitivity to this region provides butterflies several benefits such as nectar guide for nectar, but it also provides a private communication channel unavailable to predators. With this secure line, butterflies are able to facilitate mating behavior.

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