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Spatial reflection patterns of iridescent wings of male pierid butterflies: curved scales reflect at a wider angle than flat scales

机译:雄性皮蝶的虹彩翅膀的空间反射模式:弯曲的鳞片比平坦的鳞片反射的角度更大

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摘要

The males of many pierid butterflies have iridescent wings, which presumably function in intraspecific communication. The iridescence is due to nanostructured ridges of the cover scales. We have studied the iridescence in the males of a few members of Coliadinae, Gonepteryx aspasia, G. cleopatra, G. rhamni, and Colias croceus, and in two members of the Colotis group, Hebomoia glaucippe and Colotis regina. Imaging scatterometry demonstrated that the pigmentary colouration is diffuse whereas the structural colouration creates a directional, line-shaped far-field radiation pattern. Angle-dependent reflectance measurements demonstrated that the directional iridescence distinctly varies among closely related species. The species-dependent scale curvature determines the spatial properties of the wing iridescence. Narrow beam illumination of flat scales results in a narrow far-field iridescence pattern, but curved scales produce broadened patterns. The restricted spatial visibility of iridescence presumably plays a role in intraspecific signalling.Electronic supplementary materialThe online version of this article (doi:10.1007/s00359-011-0661-6) contains supplementary material, which is available to authorized users.
机译:许多有刺蝴蝶的雄性都有虹彩的翅膀,大概在种内通讯中起作用。虹彩是由于覆盖鳞片的纳米结构脊。我们已经研究了几个lia虫科,Gonepteryx aspasia,克利奥帕特拉,G。rhamni和Colias croceus的雄性,以及Colotis组的两个成员Hebomoia glaucippe和Colotis regina的虹彩。成像散射法表明,颜料着色是弥散的,而结构着色产生了方向性的,线形的远场辐射图。角度相关的反射率测量结果表明,在紧密相关的物种之间,方向性虹彩明显不同。与物种有关的尺度曲率决定了机翼虹彩的空间特性。平坦标尺的窄光束照明导致狭窄的远场虹彩图案,但弯曲标尺产生更宽的图案。虹彩的受限空间可见性可能在种内信号传导中起作用。电子补充材料本文的在线版本(doi:10.1007 / s00359-011-0661-6)包含补充材料,授权用户可以使用。

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