Full spectra colouration and condition-dependent signalling in a skin-based carotenoid sexual ornament

Harris, Sarah, Kervinen, Matti, Lebigre, Christophe, Pike, Tom and Soulsbury, Carl (2020) Full spectra colouration and condition-dependent signalling in a skin-based carotenoid sexual ornament. Behavioral Ecology . ISSN 1045-2249

Full content URL: https://doi.org/10.1093/beheco/araa031

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Full spectra colouration and condition-dependent signalling in a skin-based carotenoid sexual ornament
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Abstract

Carotenoid-based traits commonly act as condition-dependent signals of quality to both males and females. Such colours are typically quantified using summary metrics (e.g. redness) derived by partitioning measured reflectance spectra into blocks. However perceived colouration is a product of the whole spectrum. Recently, new methods have quantified a range of environmental factors and their impact on reflection data at narrow wavebands across the whole spectrum. Using this approach, we modelled the reflectance of red integumentary eye combs displayed by male black grouse (Lyrurus tetrix) as a function of ornament size and variables related to male quality. We investigated the strength and direction of effect sizes of variables at each waveband. The strongest effect on the spectra came from eye comb size, with a negative effect in the red part of the spectrum and a positive effect in UV reflectance. Plasma carotenoid concentration and body mass were also related to reflectance variance in differing directions across the entire spectra. Comparisons of yearlings and adults showed effects were similar, but stronger on adult reflectance spectra. These findings suggest reflectance in different parts of the spectrum are indicative of differing components of quality. This method also allows a more accurate understanding of how biologically relevant variables may interact to produce perceived colouration and multi-component signals, and where the strongest biological effects are found

Keywords:sexual selection, black grouse, carotenoids, eye comb, reflectance spectra
Subjects:C Biological Sciences > C120 Behavioural Biology
C Biological Sciences > C300 Zoology
C Biological Sciences > C182 Evolution
Divisions:College of Science > School of Life Sciences
ID Code:40177
Deposited On:10 Mar 2020 16:07

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