Colour change on different body regions provides thermal and signalling advantages in bearded dragon lizards

Smith, Kathleen R., Cadena, Viviana, Endler, John, Porter, Warren P., Kearney, Michael R. and Stuart-Fox, Devi 2016, Colour change on different body regions provides thermal and signalling advantages in bearded dragon lizards, Proceedings of the Royal Society B: biological sciences, vol. 283, no. 1832, pp. 1-9, doi: 10.1098/rspb.2016.0626.

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Title Colour change on different body regions provides thermal and signalling advantages in bearded dragon lizards
Author(s) Smith, Kathleen R.
Cadena, Viviana
Endler, JohnORCID iD for Endler, John
Porter, Warren P.
Kearney, Michael R.
Stuart-Fox, Devi
Journal name Proceedings of the Royal Society B: biological sciences
Volume number 283
Issue number 1832
Start page 1
End page 9
Total pages 9
Publisher The Royal Society Publishing
Place of publication London, Eng.
Publication date 2016-06-08
ISSN 0962-8452
Keyword(s) colour change
biophysical modelling
Science & Technology
Life Sciences & Biomedicine
Evolutionary Biology
Life Sciences & Biomedicine - Other Topics
Environmental Sciences & Ecology
Summary Many terrestrial ectotherms are capable of rapid colour change, yet it is unclear how these animals accommodate the multiple functions of colour, particularly camouflage, communication and thermoregulation, especially when functions require very different colours. Thermal benefits of colour change depend on an animal's absorptance of solar energy in both UV–visible (300-700 nm) and near-infrared (NIR; 700-2600 nm) wavelengths, yet colour research has focused almost exclusively on the former. Here, we show that wild-caught bearded dragon lizards (Pogona vitticeps) exhibit substantial UV–visible and NIR skin reflectance change in response to temperature for dorsal but not ventral (throat and upper chest) body regions. By contrast, lizards showed the greatest temperature-independent colour change on the beard and upper chest during social interactions and as a result of circadian colour change. Biophysical simulations of heat transfer predicted that the maximum temperature-dependent change in dorsal reflectivity could reduce the time taken to reach active body temperature by an average of 22 min per active day, saving 85 h of basking time throughout the activity season. Our results confirm that colour change may serve a thermoregulatory function, and competing thermoregulation and signalling requirements may be met by partitioning colour change to different body regions in different circumstances.
Language eng
DOI 10.1098/rspb.2016.0626
Field of Research 060399 Evolutionary Biology not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, The Authors
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Created: Mon, 29 Aug 2016, 09:43:33 EST

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