Color signals in the Black Grouse (Tetrao tetrix) : signal properties and their condition dependency

Siitari, Heli, Alatalo, Rauno V., Halme, Panu, Buchanan, Katherine L. and Kilpimaa, Janne 2007, Color signals in the Black Grouse (Tetrao tetrix) : signal properties and their condition dependency, American naturalist, vol. 169, no. supplement, pp. S81-S92.

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Title Color signals in the Black Grouse (Tetrao tetrix) : signal properties and their condition dependency
Formatted title Color signals in the Black Grouse (Tetrao tetrix) : signal properties and their condition dependency
Author(s) Siitari, Heli
Alatalo, Rauno V.
Halme, Panu
Buchanan, Katherine L.
Kilpimaa, Janne
Journal name American naturalist
Volume number 169
Issue number supplement
Start page S81
End page S92
Publisher University of Chicago Press
Place of publication Chicago, Ill.
Publication date 2007-01
ISSN 0003-0147
1537-5323
Keyword(s) carotenoids
color spectrum analysis
sexual selection
structural coloration
testosterone
Summary Recent progress in techniques of quantifying between‐individual differences of color‐based ornaments has revealed undiscovered possibilities for research in sexual selection. We present how the color spectra data can be comprehensively used for studying the importance of sexual ornaments in the black grouse and how these ornaments are related to a male condition. For this, we used both correlative field and experimental data. Field data indicated that older males had more chromatic coloration than yearlings. Blue chroma of males was correlated with male mating success. We experimentally manipulated yearling birds with testosterone implants and found that testosterone‐implanted males had impaired expression of several sexual ornaments: 10 months after the implantation, both structural‐based blue and carotenoid‐based red eye comb coloration were diminished, as well as lyre (tail) length. However, the manipulation did not affect vital traits under natural selection (wing length or body mass). Our data indicate that structural color is an important trait in sexual selection in this lekking species. Importantly, the data also indicate that male sexual ornaments are more susceptible to environmental conditions than the other male traits, thus showing their heightened condition dependency compared with the other traits mediating the honesty of signaling.
Notes (published January 2007)
Language eng
Field of Research 060399 Evolutionary Biology not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2007, The University of Chicago
Persistent URL http://hdl.handle.net/10536/DRO/DU:30020165

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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