Spatial distribution of selenium-mercury in Arctic seabirds
2024
Cruz-Flores, Marta | Lemaire, Jérémy | Brault-Favrou, Maud | Christensen-Dalsgaard, Signe | Churlaud, Carine | Descamps, Sébastien | Elliott, Kyle | Erikstad, Kjell Einar | Ezhov, Alexey | Gavrilo, Maria | Grémillet, David | Guillou, Gaël | Hatch, Scott | Per Huffeldt, Nicholas | Kitaysky, Alexander | Kolbeinsson, Yann | Krasnov, Yuri | Langset, Magdalene | Leclaire, Sarah | Linnebjerg, Jannie | Lorentzen, Erlend | Mallory, Mark | Merkel, Flemming | Montevecchi, William | Mosbech, Anders | Patterson, Allison | Perret, Samuel | Provencher, Jennifer | Reiertsen, Tone | Renner, Heather | Strøm, Hallvard | Takahashi, Akinori | Thiebot, Jean-Baptiste | Thórarinsson, Thorkell Lindberg | Will, Alexis | Bustamante, Paco | Fort, Jérôme | LIttoral ENvironnement et Sociétés (LIENSs) ; La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) | Norwegian Institute for Nature Research (NINA) | Norwegian Polar Institute | Department of Natural Resource Sciences ; McGill University = Université McGill [Montréal, Canada] | Russian Academy of Science | Arctic and Antarctic Research Institute (AARI) ; Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet) | Centre d’Ecologie Fonctionnelle et Evolutive (CEFE) ; Université Paul-Valéry - Montpellier 3 (UPVM)-École Pratique des Hautes Études (EPHE) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [Occitanie])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université de Montpellier (UM) | National Institute of Polar Research [Tokyo] (NiPR) | Northeast Iceland Nature Research Centre [Húsavík] | ANR-16-CE34-0005,ILETOP,Impact des polluants historiques et émergents sur les prédateurs supérieurs marins de l'Arctique(2016)
International audience
显示更多 [+] 显示较少 [-]英语. Mercury (Hg) is a metallic trace element toxic for humans and wildlife that can originate from natural and anthropic sources. Hg spatial gradients have been found in seabirds from the Arctic and other oceans, suggesting contrasting toxicity risks across regions. Selenium (Se) plays a protective role against Hg toxicity, but its spatial distribution has been much less investigated than that of Hg. From 2015 to 2017, we measured spatial coexposure of Hg and Se in blood samples of two seabird species, the Brünnich’s guillemot (Uria lomvia) and the black-legged kittiwake (Rissa tridactyla) from 17 colonies in the Arctic and subarctic regions, and we calculated their molar ratios (Se:Hg), as a measure of Hg sequestration by Se and, therefore, of Hg exposure risk. We also evaluated concentration differences between species and ocean basins (Pacific-Arctic and Atlantic-Arctic), and examined the influence of trophic ecology on Hg and Se concentrations using nitrogen and carbon stable isotopes. In the Atlantic-Arctic ocean, we found a negative west-to-east gradient of Hg and Se for guillemots, and a positive west-to-east gradient of Se for kittiwakes, suggesting that these species are better protected from Hg toxicity in the European Arctic. Differences in Se gradients between species suggest that they do not follow environmental Se spatial variations. This, together with the absence of a general pattern for isotopes influence on trace element concentrations, could be due to foraging ecology differences between species. Inboth oceans, the two species showed similar Hg concentrations, but guillemots showed lower Se concentrations and Se:Hg than kittiwakes, suggesting a higher Hg toxicity risk in guillemots. Within species, neither Hg, nor Se or Se:Hg differed between both oceans. Our study highlights the importance of considering Se together with Hg, along with different species and regions, when evaluating Hg toxic effects on marine predators in internationalmonitoring programs.
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