Dietary lipids reduce the expression of carotenoid-based coloration in Lacerta vivipara

Details

Serval ID
serval:BIB_AD274E5AE7EE
Type
Article: article from journal or magazin.
Collection
Publications
Title
Dietary lipids reduce the expression of carotenoid-based coloration in Lacerta vivipara
Journal
FUNCTIONAL ECOLOGY
Author(s)
San-Jose Luis M., Granado-Lorencio Fernando, Fitze Patrick S.
ISSN-L
0269-8463
Publication state
Published
Issued date
2012
Peer-reviewed
Oui
Volume
26
Number
3
Pages
646-656
Language
english
Notes
ISI:000304256500012
Abstract
1. The importance of dietary lipids for carotenoid-based ornaments has
rarely been investigated, although theory predicts that dietary lipids
may control the development of these widespread animal signals. Dietary
lipids have been suggested to enhance the expression of male
carotenoid-based ornaments because they provide carotenoids with a
hydrophobic domain that facilitates their absorption and transport.
Dietary lipids may also enhance the uptake of tocopherols (vitamin E),
which share common absorption and transport routes with carotenoids.
Here, we test whether dietary lipids enhance carotenoid availability and
male carotenoid-based colorations. We also explore the effects of
dietary lipids on plasma tocopherol concentration, which allow
disentangling between different pathways that may explain how dietary
lipids affect ornamental expression. 2. Following a two-factorial
design, we manipulated dietary access of naturally occurring fatty acids
(oleic acid) and carotenoids (lutein and zeaxanthin) and measured its
effects on the circulating concentrations of carotenoids (lutein and
zeaxanthin) and vitamin E (a- and ?-(beta-) tocopherols) and on the
ventral, carotenoid-based coloration of male common lizards (Lacerta
vivipara). 3. Lutein but not zeaxanthin plasma concentrations increased
with carotenoid supplementation, which, however, did not affect
coloration. Lipid intake negatively affected circulating concentrations
of lutein and ?-(beta-) tocopherol and led to significantly less orange
colorations. The path analysis suggests that a relationship between the
observed colour change and the change in plasma concentrations of
?-(beta-) tocopherol may exist. 4. Our study shows for the first time
that dietary lipids do not enhance but reduce the intensity of male
carotenoid-based ornaments. Although dietary lipids affected plasma
carotenoid concentration, its negative effect on coloration appeared to
be linked to lower vitamin E plasma concentrations. These findings
suggest that a conflict between dietary lipids and carotenoid and
tocopherol uptake may arise if these nutrients are independently
obtained from natural diets and that such conflict may reinforce signal
honesty in carotenoid-based ornaments. They also suggest that, at least
in the common lizard, sexual selection with respect to carotenoid-based
coloration may select for males with low antioxidant capacity and thus
for males of superior health.
Create date
03/07/2012 16:57
Last modification date
20/08/2019 16:17
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