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Afternoon T : Testosterone level is higher in red than yellow male polychromatic lizards

Olsson, Mats, Healey, Mo and Astheimer, Lee 2007, Afternoon T : Testosterone level is higher in red than yellow male polychromatic lizards, Physiology and behavior, vol. 91, no. 5, pp. 531-534, doi: 10.1016/j.physbeh.2007.04.025.

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Title Afternoon T : Testosterone level is higher in red than yellow male polychromatic lizards
Author(s) Olsson, Mats
Healey, Mo
Astheimer, Lee
Journal name Physiology and behavior
Volume number 91
Issue number 5
Start page 531
End page 534
Publisher Elsevier Inc
Place of publication Amsterdam, The Netherlands
Publication date 2007-08-15
ISSN 0031-9384
1873-507X
Keyword(s) testosterone
polymorphism
lizard
territorial
Summary Recent work on within-species polymorphism across a broad range of taxa has renewed and considerably increased the attention to this classic evolutionary area, notably in lizard species where colors covary with reproductive strategies. We demonstrate elsewhere that red-headed males beat yellow-headed males in staged contests for females in the Australian painted dragon lizard Ctenophorus pictus. This morph difference in behaviour is linked to what appears to be a convention of red dominance in male–male interactions set very early in ontogeny, long before coloration has developed. In the current note, we investigate the relationship between time of day, which is directly linked to vigilance time in territorial males, and plasma levels of testosterone and corticosterone. We show that red males have higher testosterone levels in late afternoon following a day of territory patrolling and a non-significant trend in plasma corticosterone levels that decline with time of day. In conclusion, there are significant differences in testosterone profile between the two color morphs, providing a potential proximate link to the behavioural differences between them.
Language eng
DOI 10.1016/j.physbeh.2007.04.025
Field of Research 060199 Biochemistry and Cell Biology not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2007, Elsevier Ltd
Persistent URL http://hdl.handle.net/10536/DRO/DU:30019370

Document type: Journal Article
Collection: Office of the Deputy Vice-Chancellor Research
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Created: Fri, 11 Sep 2009, 12:40:41 EST by Leanne Swaneveld

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