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Accepted Manuscript
Research Article
Adaptive camouflage: What can be learned from the wetting behaviour of the tropical flatbugs Dysodius lunatus and D. magnus
Florian Hischen, Vladislav Reiswich, Desirée Kupsch, Ninon De Mecquenem, Michael Riedel, Markus Himmelsbach, Agnes Weth, Ernst Heiss, Oskar Armbruster, Johannes Heitz, Werner Baumgartner
Biology Open 2017 : bio.026070 doi: 10.1242/bio.026070 Published 27 July 2017
Florian Hischen
Institute of Biomedical Mechatronics, Johannes Kepler University of Linz, Altenbergerstr. 69, 4040 Linz, AustriaDepartment of Cellular Neurobionics, Institute of Biology II, RWTH-Aachen University, Worringerweg 3, 52056 Aachen, Germany
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  • ORCID record for Florian Hischen
Vladislav Reiswich
Department of Cellular Neurobionics, Institute of Biology II, RWTH-Aachen University, Worringerweg 3, 52056 Aachen, Germany
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Desirée Kupsch
Department of Cellular Neurobionics, Institute of Biology II, RWTH-Aachen University, Worringerweg 3, 52056 Aachen, Germany
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Ninon De Mecquenem
University of Bordeaux, Campus Talence, 351 Cours de la Libération, 33400 Talence, France
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Michael Riedel
Department of Botany II, University of Würzburg, Julius-von-Sachs-Platz 3, D - 97082 Würzburg, Germany
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Markus Himmelsbach
Institute of Analytical Chemistry, Johannes Kepler University of Linz, Altenbergerstr. 69, 4040 Linz, Austria
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Agnes Weth
Institute of Biomedical Mechatronics, Johannes Kepler University of Linz, Altenbergerstr. 69, 4040 Linz, Austria
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Ernst Heiss
Tiroler Landesmuseum, Josef-Schraffl-Straße 2a, A-6020 Innsbruck, Austria
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Oskar Armbruster
Institute of Applied Physics, Johannes Kepler University of Linz, Altenbergerstr. 69, 4040 Linz, Austria
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Johannes Heitz
Institute of Applied Physics, Johannes Kepler University of Linz, Altenbergerstr. 69, 4040 Linz, Austria
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Werner Baumgartner
Institute of Biomedical Mechatronics, Johannes Kepler University of Linz, Altenbergerstr. 69, 4040 Linz, Austria
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  • For correspondence: florian.hischen@jku.at
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Abstract

The neotropical flatbug species Dysodius lunatus and Dysodius magnus show a fascinating camouflage principle. Its appearance renders the animal hardly visible on the bark of trees. However, when getting wet due to rain, bark changes its colour and gets darker. In order to keep the camouflage effect, it seems as if some Dysodius species benefit from their ability to hold a water film on their cuticle and therefore change their optical properties when wetted by water too. This camouflage behaviour requires the insect to have a hydrophilic surface and passive surface structures, which facilitate the liquid spreading. Here we show morphological and chemical characterisations of the surface, especially the cuticular waxes of Dysodius magnus. Scanning electron microscopy revealed that the animal is covered with pillar-like microstructures which in combination with a surprising chemical hydrophilicity of the cuticle waxes, render the bug almost superhydrophilic: Water spreads immediately across the surface. We could theoretically model this behaviour assuming the effect of hemi-wicking (a state in which a droplet sits on a rough surface, partwise imbibing the structure around). Additionally the principle was abstracted and a laser patterned polymer surface, mimicking the structure and contact angle of Dysodius-wax, shows exactly the behaviour of the natural role model – immediate spreading of water and the formation of a thin continuous water film changing optical properties of the surface.

  • Received April 5, 2017.
  • Accepted June 27, 2017.
  • © 2017. Published by The Company of Biologists Ltd
http://creativecommons.org/licenses/by/3.0

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed.

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Keywords

  • Wetting
  • Bug-biomimetics
  • Reflectance
  • Camouflage
  • Liquid-surface-interaction
  • Laser structuring
  • Microstructures

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Accepted Manuscript
Research Article
Adaptive camouflage: What can be learned from the wetting behaviour of the tropical flatbugs Dysodius lunatus and D. magnus
Florian Hischen, Vladislav Reiswich, Desirée Kupsch, Ninon De Mecquenem, Michael Riedel, Markus Himmelsbach, Agnes Weth, Ernst Heiss, Oskar Armbruster, Johannes Heitz, Werner Baumgartner
Biology Open 2017 : bio.026070 doi: 10.1242/bio.026070 Published 27 July 2017
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Accepted Manuscript
Research Article
Adaptive camouflage: What can be learned from the wetting behaviour of the tropical flatbugs Dysodius lunatus and D. magnus
Florian Hischen, Vladislav Reiswich, Desirée Kupsch, Ninon De Mecquenem, Michael Riedel, Markus Himmelsbach, Agnes Weth, Ernst Heiss, Oskar Armbruster, Johannes Heitz, Werner Baumgartner
Biology Open 2017 : bio.026070 doi: 10.1242/bio.026070 Published 27 July 2017

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