Availability of non-carotenoid antioxidants affects the expression of a carotenoid-based sexual ornament
Open Access
- 1 May 2007
- journal article
- Published by The Royal Society in Biology Letters
- Vol. 3 (4), 353-356
- https://doi.org/10.1098/rsbl.2007.0072
Abstract
Carotenoids are responsible for much of the yellow, orange and red pigmentation in the animal kingdom, and the importance of such coloration as an honest signal of individual quality has received widespread attention. In particular, owing to the multiple roles of carotenoids as pigments, antioxidants and immunostimulants, carotenoid-based coloration has been suggested to advertise an individual's antioxidant or immune defence capacity. However, it has recently been argued that carotenoid-based signals may in fact be advertising the availability of different antioxidants, many of which (including various vitamins, antioxidant enzymes and minerals) are colourless and so would be uninformative as components of a visual signal, yet often have greater biological activity than carotenoids. We tested this hypothesis by feeding male sticklebacks ( Gasterosteus aculeatus ) a diet containing a fixed level of carotenoids and either low or high, but biologically realistic levels of the colourless antioxidant vitamins C and E. High-antioxidant diet males produced significantly more intensely coloured (but not larger) carotenoid-based regions of nuptial coloration and were preferred over size-matched males of the opposite diet treatment in mate-choice trials. Furthermore, there were positive correlations between an individual's somatic antioxidant activity and signal intensity. Our data suggest that carotenoid-based ornaments may honestly signal an individual's availability of non-carotenoid antioxidants, allowing females to make adaptive mate-choice decisions.Keywords
This publication has 26 references indexed in Scilit:
- Do carotenoid-based sexual traits signal the availability of non-pigmentary antioxidants?Journal Of Experimental Biology, 2006
- Carotenoid Modulation of Immune Function and Sexual Attractiveness in Zebra FinchesScience, 2003
- Immune Activation Rapidly Mirrored in a Secondary Sexual TraitScience, 2003
- Free radicals, antioxidants, and nutritionNutrition, 2002
- Indirect fitness consequences of mate choice in sticklebacks: offspring of brighter males grow slowly but resist parasitic infectionsProceedings Of The Royal Society B-Biological Sciences, 2001
- Why egg yolk is yellowTrends in Ecology & Evolution, 2000
- Retinoids are important cofactors in T cell activation.The Journal of Experimental Medicine, 1992
- Ascorbic acid protects against endogenous oxidative DNA damage in human sperm.Proceedings of the National Academy of Sciences, 1991
- Tunicates and FishPublished by Springer Science and Business Media LLC ,1984
- The autoxidation of unsaturated lipids in micelles. Synergism of inhibitors vitamins C and ECanadian Journal of Chemistry, 1983