Structural coloured feathers of mallards act by simple multilayer photonics.

Détails

ID Serval
serval:BIB_3F51EA27BBF1
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Structural coloured feathers of mallards act by simple multilayer photonics.
Périodique
Journal of the Royal Society, Interface
Auteur(s)
Stavenga D.G., van der Kooi C.J., Wilts B.D.
ISSN
1742-5662 (Electronic)
ISSN-L
1742-5662
Statut éditorial
Publié
Date de publication
2017
Peer-reviewed
Oui
Volume
14
Numéro
133
Pages
1-12
Langue
anglais
Résumé
The blue colours of the speculum of the mallard (Anas platyrhynchos), both male and female, and the green head feathers of the male arise from light interacting with stacks of melanosomes residing in the feather barbules. Here, we show that the iridescent colours can be quantitatively explained with an optical multilayer model by using a position-dependent effective refractive index, which results from the varying ratio of melanin and keratin. Reflectance spectra obtained by multilayer modelling and three-dimensional finite-difference time-domain calculations were virtually identical. The spectral properties of the barbules' photonic structures are sensitive to variations in the multilayer period and the cortex thickness, but they are surprisingly robust to variations in the spatial parameters of the barbules' melanosome stacks. The blue and green reflectance spectra of the structural-coloured feathers correspond with the sensitivity spectra of the short- and middle-wavelength-sensitive photoreceptors, indicating their biological significance for intraspecific signalling.

Mots-clé
animal coloration, finite-difference time-domain, iridescence, melanin, sexual dichromatism
Pubmed
Web of science
Open Access
Oui
Création de la notice
07/07/2017 12:25
Dernière modification de la notice
20/08/2019 13:36
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