title: Corticosterone, prolactin and egg neglect behavior in relation to mercury and legacy POPs in a long-lived Antarctic bird.
abstract: 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 behavior 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 behavior 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.
authors.affiliation: UMR 7372, CNRS-Université de La Rochelle, Villiers-en-bois, France. Electronic address: tartu.sabrina@gmail.com.
authors.forename: S
authors.initials: S
authors.lastname: Tartu
authors.affiliation: UMR 7372, CNRS-Université de La Rochelle, Villiers-en-bois, France.
authors.forename: F
authors.initials: F
authors.lastname: Angelier
authors.affiliation: Department of Neurobiology, Physiology and Behavior, University of CA, Davis, USA.
authors.forename: J C
authors.initials: JC
authors.lastname: Wingfield
authors.affiliation: Littoral Environnement et Sociétés (LIENSs), UMR 7266 CNRS-Université de la Rochelle, La Rochelle, France.
authors.forename: P
authors.initials: P
authors.lastname: Bustamante
authors.affiliation: Université de Bordeaux, EPOC/LPTC, UMR 5805, F-33400 Talence, France; CNRS, EPOC/LPTC, UMR 5805, F-33400 Talence, France.
authors.forename: P
authors.initials: P
authors.lastname: Labadie
authors.affiliation: Université de Bordeaux, EPOC/LPTC, UMR 5805, F-33400 Talence, France; CNRS, EPOC/LPTC, UMR 5805, F-33400 Talence, France.
authors.forename: H
authors.initials: H
authors.lastname: Budzinski
authors.affiliation: UMR 7372, CNRS-Université de La Rochelle, Villiers-en-bois, France.
authors.forename: H
authors.initials: H
authors.lastname: Weimerskirch
authors.affiliation: Norwegian Institute for Nature Research, FRAM - High North Research Centre on Climate and the Environment, NO-9296 Tromsø, Norway.
authors.forename: J O
authors.initials: JO
authors.lastname: Bustnes
authors.affiliation: UMR 7372, CNRS-Université de La Rochelle, Villiers-en-bois, France.
authors.forename: O
authors.initials: O
authors.lastname: Chastel
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D001717:Birds / Q000502:physiology*; D003345:Corticosterone / Q000097:blood*; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000097:blood / Q000633:toxicity*; D005260:Female; D008297:Male; D008628:Mercury / Q000097:blood / Q000633:toxicity*; D011388:Prolactin / Q000097:blood*; D013312:Stress, Physiological
chemical_list: D004785:Environmental Pollutants; D011388:Prolactin; D008628:Mercury; D003345:Corticosterone
keywords: Age; Mercury; Persistent organic pollutants; Reproduction; Snow petrel