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Diffusive structural colour in Hoplia argentea.

  • Kilchoer C Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland.
  • Pirih P Department of Biology, Biotechnical Faculty, University of Ljubljana, Vecna pot 111, 1000 Ljubljana, Slovenia.
  • Steiner U Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland.
  • Wilts BD Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland bodo.wilts@unifr.ch.
  • 2019-11-27
Published in:
  • The Journal of experimental biology. - 2019
Camouflage
Insect colours
Iridescence
Light scattering
Pigment filter
Animals
Coleoptera
Color
Female
Fluorometry
Male
Microscopy, Electron, Scanning
Microspectrophotometry
Models, Biological
English Nature's nanostructures can bring about vivid and iridescent colours seen in many insects, notably in beetles and butterflies. While the intense structural colours can be advantageous for display purposes, they may also be appealing to predators and therefore constitute an evolutionary disadvantage. Animals often employ absorption and scattering in order to reduce the directionality of the reflected light and thereby enhance their camouflage. Here, we investigated the monkey beetle Hoplia argentea using microspectrophotometry, electron microscopy, fluorimetry and optical modelling. We show that the dull green dorsal colour comes from the nanostructured scales on the elytra. The nanostructure consists of a multi-layered photonic structure covered by a filamentous layer. The filamentous layer acts as a spatial diffuser of the specular reflection from the multilayer and suppresses the iridescence. This combination leads to a colour-stable and angle-independent green reflection that probably enhances the camouflage of the beetles in their natural habitat.
Language
  • English
Open access status
bronze
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Persistent URL
https://susi.usi.ch/global/documents/159255
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