Corticosterone, prolactin and egg neglect behavior in relation to mercury and legacy POPs in a long-lived Antarctic bird

Sabrina Tartu (1) , Frédéric Angelier (1) , John C. Wingfield (2) , Paco Bustamante (3) , Pierre Labadie (4, 4) , Hélène Budzinski (4, 4) , Henri Weimerskirch (1) , Jan Ove Bustnes (5) , Olivier Chastel (1)

1 CEBC - Centre d'Études Biologiques de Chizé - UMR 7372
2 Department of Neurobiology, Physiology, and Behavior
3 LIENSs - LIttoral ENvironnement et Sociétés
4 EPOC - Environnements et Paléoenvironnements OCéaniques
5 NINA - Division of Arctic Ecology

Seabirds often have high loads of contaminants. These contaminants have endocrine disrupting properties but their relationships with some endocrine mechanisms are still poorly investigated in free-living organisms. This is the case for the stress response which shifts energy investment away from reproduction and redirects it towards survival. In birds, this stress response is achieved through a release of corticosterone and is also accompanied by a decrease in circulating prolactin, an anterior pituitary hormone widely involved in regulating parental cares. We measured blood concentrations of some legacy persistent organic pollutants (POPs) and mercury (Hg) and examined their relationships with the corticosterone and prolactin responses of known-age (9-46 years old) incubating snow petrels (Pagodroma nivea) to a standardized capture/handling stress protocol. In this Antarctic seabird, we also investigated whether high contaminant burden correlates with a higher occurrence of egg neglect, a frequently observed behaviour in snow petrels. POPs and Hg were unrelated to age. Stress-induced corticosterone concentrations were positively related to POPs in both sexes, and stress-induced prolactin concentrations were negatively related to Hg in males. Egg-neglect behaviour was not related to POPs burden, but males with higher Hg concentrations were more likely to neglect their egg. This suggests that in birds, relationships between age and contaminants are complex and that even low to moderate concentrations of POPs and Hg are significantly related to hormonal secretion. In this Antarctic species, exposure to legacy POPs and Hg could make individuals more susceptible to environmental stressors such as ongoing disturbances in polar regions.

Mots clés: Persistent organic pollutants; Mercury; Age; Snow petrel; Reproduction

Domaines: Ecotoxicologie

Sabrina Tartu, Frédéric Angelier, John C. Wingfield, Paco Bustamante, Pierre Labadie, et al.. Corticosterone, prolactin and egg neglect behavior in relation to mercury and legacy POPs in a long-lived Antarctic bird. Science of the Total Environment, 2015, 505, pp.180 - 188. ⟨10.1016/j.scitotenv.2014.10.008⟩. ⟨hal-01104653⟩