Maternal allocation of carotenoids increases tolerance to bacterial infection in brown trout.

Détails

Ressource 1Télécharger: wilkins2017.pdf (4404.18 [Ko])
Etat: Serval
Version: Author's accepted manuscript
ID Serval
serval:BIB_5A36CDCEAA26
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Maternal allocation of carotenoids increases tolerance to bacterial infection in brown trout.
Périodique
Oecologia
Auteur(s)
Wilkins LGE, Marques da Cunha L., Menin L., Ortiz D., Vocat-Mottier V., Hobil M., Nusbaumer D., Wedekind C.
ISSN
1432-1939 (Electronic)
ISSN-L
0029-8549
Statut éditorial
Publié
Date de publication
2017
Peer-reviewed
Oui
Volume
185
Numéro
3
Pages
351-363
Langue
anglais
Résumé
Life-history theory predicts that iteroparous females allocate their resources differently among different breeding seasons depending on their residual reproductive value. In iteroparous salmonids there is typically much variation in egg size, egg number, and in the compounds that females allocate to their clutch. These compounds include various carotenoids whose functions are not sufficiently understood yet. We sampled 37 female and 35 male brown trout from natural streams, collected their gametes for in vitro fertilizations, experimentally produced 185 families in 7 full-factorial breeding blocks, raised the developing embryos singly (n = 2960), and either sham-treated or infected them with Pseudomonas fluorescens. We used female redness (as a measure of carotenoids stored in the skin) and their allocation of carotenoids to clutches to infer maternal strategies. Astaxanthin contents largely determined egg colour. Neither egg weight nor female size was correlated with the content of this carotenoid. However, astaxanthin content was positively correlated with larval growth and with tolerance against P. fluorescens. There was a negative correlation between female skin redness and the carotenoid content of their eggs. Although higher astaxanthin contents in the eggs were associated with an improvement of early fitness-related traits, some females appeared not to maximally support their current offspring as revealed by the negative correlation between female red skin colouration and egg carotenoid content. This correlation was not explained by female size and supports the prediction of a maternal trade-off between current and future reproduction.

Mots-clé
Astaxanthin, Bacterial infection, Pseudomonas fluorescens, Salmonidae, Tolerance to infection
Pubmed
Web of science
Open Access
Oui
Création de la notice
28/06/2017 11:13
Dernière modification de la notice
08/05/2019 19:02
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