To breed or not to breed: endocrine response to mercury contamination by an arctic seabird

Abstract : Mercury, a ubiquitous toxic element is known to alter expression of sex steroids and to impair reproduction across vertebrates but the mechanisms underlying these effects are not clearly identified. We examined whether contamination by mercury predicts the probability to skip reproduction in black-legged kittiwakes (Rissa tridactyla) from Svalbard. We also manipulated the endocrine system to investigate the mechanism underlying this relationship. During the pre-laying period, we injected exogenous GnRH (gonadotropin-releasing hormone) to test the ability of the pituitary to release luteinizing hormone (LH, a key hormone for the release of sex steroids and hence breeding) in relation to mercury burden. Birds that skipped reproduction had significantly higher mercury concentration in blood than breeders. Endocrine profiles of these birds also varied based on breeding status (breeders vs. non-breeders), mercury contamination and sex. Specifically, in skippers (birds that did not breed), baseline LH decreased with increasing mercury concentration in males, while it increased in females. GnRH-induced LH levels increased with increasing mercury concentration in both sexes. These results suggest that mercury contamination may disrupt GnRH input to the pituitary. Thus, high mercury concentration could affect the ability of long-lived birds to modulate their reproductive effort (skipping or breeding) according to ongoing environmental changes in the Arctic and impact population dynamics.
Type de document :
Article dans une revue
Biology Letters, Royal Society, The, 2013, 9 (4), pp.20130317. 〈10.1098/rsbl.2013.0317〉
Liste complète des métadonnées

Littérature citée [20 références]  Voir  Masquer  Télécharger

https://hal.archives-ouvertes.fr/hal-00918744
Contributeur : Paco Bustamante <>
Soumis le : vendredi 24 mars 2017 - 00:30:18
Dernière modification le : jeudi 11 janvier 2018 - 06:23:35
Document(s) archivé(s) le : dimanche 25 juin 2017 - 12:22:38

Fichier

Tartu et al 2013 BIOL LETTERS....
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Sabrina Tartu, Aurélie Goutte, Paco Bustamante, Frédéric Angelier, Borge Moe, et al.. To breed or not to breed: endocrine response to mercury contamination by an arctic seabird. Biology Letters, Royal Society, The, 2013, 9 (4), pp.20130317. 〈10.1098/rsbl.2013.0317〉. 〈hal-00918744v2〉

Partager

Métriques

Consultations de la notice

169

Téléchargements de fichiers

43