Environmental stress linked to consumption of maternally derived carotenoids in brown trout embryos (Salmo trutta).

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State: Public
Version: Final published version
Serval ID
serval:BIB_CAE6462ADFC7
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Environmental stress linked to consumption of maternally derived carotenoids in brown trout embryos (Salmo trutta).
Journal
Ecology and Evolution
Author(s)
Wilkins LGE, Marques da Cunha L., Glauser G., Vallat A., Wedekind C.
ISSN
2045-7758 (Print)
ISSN-L
2045-7758
Publication state
Published
Issued date
2017
Peer-reviewed
Oui
Volume
7
Number
14
Pages
5082-5093
Language
english
Abstract
The yellow, orange, or red colors of salmonid eggs are due to maternally derived carotenoids whose functions are not sufficiently understood yet. Here, we studied the significance of naturally acquired carotenoids as maternal environmental effects during embryo development in brown trout (Salmo trutta). We collected eggs from wild females, quantified their egg carotenoid content, fertilized them in vitro in full-factorial breeding blocks to separate maternal from paternal effects, and raised 3,278 embryos singly at various stress conditions until hatching. We found significant sire effects that revealed additive genetic variance for embryo survival and hatching time. Dam effects were 5.4 times larger than these sire effects, indicating that maternal environmental effects play an important role in determining embryo stress tolerance. Of the eight pigment molecules that we targeted, only astaxanthin, zeaxanthin (that both affected egg redness), and lutein were detected above our confidence thresholds. No strong link could be observed between carotenoid content in unfertilized eggs and embryo mortality or hatching timing. However, the consumption of carotenoids during our stress treatment was negatively correlated to embryo survival among sib groups and explained about 14% of the maternal environmental variance. We conclude that maternally derived carotenoids play a role in the ability of embryos to cope with environmental stress, but that the initial susceptibility to the organic pollution was mainly determined by other factors.

Keywords
Salmonidae, Zeaxanthin, astaxanthin, brown trout, embryo survival, lutein, maternal effects
Pubmed
Web of science
Open Access
Yes
Create date
09/05/2017 13:50
Last modification date
20/08/2019 15:45
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