Contrasting spatial and seasonal trends of methylmercury exposure pathways of Arctic seabirds: combination of large-scale tracking and stable isotopic approaches

• Published in: Environmental Science & Technology
• Main Authors: Renedo, Marina, Amouroux, David, Albert, Céline, Bérail, Sylvain, Bråthen, Vegard, S, Gavrilo, Maria, Grémillet, David, Helgason, Hálfdán, H, Jakubas, Dariusz, Mosbech, Anders, Strøm, Hallvard, Tessier, Emmanuel, Wojczulanis-Jakubas, Katarzyna, Bustamante, Paco, Fort, Jérôme
• Other Authors: LIttoral ENvironnement et Sociétés (LIENSs), La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS), Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux (IPREM), Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Norwegian Institute for Nature Research (NINA), Arctic and Antarctic Research Institute (AARI), Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet), Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC), La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Norwegian Polar Institute, University of Gdańsk (UG), Aarhus University Aarhus, Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), ANR-16-CE34-0005,ILETOP,Impact des polluants historiques et émergents sur les prédateurs supérieurs marins de l'Arctique(2016), ANR-16-TERC-0004,MAMBA,Contamination par le mercure des écosystèmes arctiques : sources, niveaux et impacts(2016)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2020
• Subjects: seabird; mercury; stable isotopes; [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; Arctic; Alle alle; arctic marine biota; little auk; North Atlantic
• Online Access: https://hal.science/hal-02969848; https://hal.science/hal-02969848/document; https://hal.science/hal-02969848/file/Renedo%20et%20al%20EST%202021.pdf; https://doi.org/10.1021/acs.est.0c03285

International audience Despite the limited direct anthropogenic mercury (Hg) inputs in the circumpolar Arctic, elevated concentrations of methylmercury (MeHg) are accumulated in Arctic marine biota. However, the MeHg production and bioaccumulation pathways in these ecosystems are not completely unravelled. We measured Hg concentrations and stable isotope ratios of Hg, carbon and nitrogen in feathers and blood of geolocator-tracked little auk Alle alle from five Arctic breeding colonies. The wide-range spatial mobility and tissue-specific Hg integration times of this planktivorous seabird allowed the exploration of their spatial (wintering quarters/breeding grounds) and seasonal (non-breeding/breeding periods) MeHg exposure. An east-to-west increase of head feather Hg concentrations (1.74-3.48 µg·g-1) was accompanied by significant spatial trends of Hg isotope (particularly Δ199Hg: 0.96 to 1.13‰) and carbon isotope (ẟ13C: -20.6 to -19.4‰) ratios. These trends suggest distinct mixing/proportion of MeHg sources between western North Atlantic and eastern Arctic regions. Higher Δ199Hg values (+0.4‰) in northern colonies indicate an accumulation of more photochemically impacted MeHg, supporting shallow MeHg production and bioaccumulation in High Arctic waters. The combination of seabird tissue isotopic analysis and spatial-tracking helps tracing the MeHg sources at various spatio-temporal scales.