Projets ARCTOX, MANBA (ANR)Scientific challenge
Une nouvelle étude dirigée par le laboratoire Littoral, Environnement et Sociétés en collaboration avec l’Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux propose une approche novatrice combinant le suivi spatial des oiseaux et l’analyse isotopiques de leurs tissus pour tracer les sources du mercure à très large échelle spatiale dans les océans Arctique et subarctique.
Ce travail est publié dans et fait la couverture de la revue Environmental Science & Technology (Volume 54, Issue 21).
https://doi.org/10.1021/acs.est.0c03285
Contrasting spatial and seasonal trends of methylmercury exposure pathways of Arctic seabirds: combination of large-scale tracking and stable isotopic approaches
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Seabirds are exposed to worrying levels of mercury in the Arctic Ocean, an ecosystem where the production and bioaccumulation pathways of this pollutant are not fully understood. This new study offers an innovative approach combining spatial monitoring of seabirds and the isotopic investigation of avian tissues to trace mercury sources at a wide spatial scale of the Arctic Ocean. Five populations of dovekies (Alle alle), with colony-specific wintering ground, were monitored during their non-breeding period. Mercury isotopic analyses of head feathers (winter period) and body feathers (summer period) provide access to different time scales of mercury exposure corresponding to their non-breeding and breeding periods. The trends of mercury and carbon stable isotopic signatures of mercury and carbon suggest a different proportion of mercury sources between regions of the western North Atlantic and those wintering eastern Arctic, which are susceptible to the complex interaction of the main oceanographic and physical parameters of these ecosystems.
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Auteurs: Marina Renedo, David Amouroux, Céline Albert, Sylvain Bérail, Vegard S Bråthen, Maria Gavrilo, David Grémillet, Hálfdán H Helgason, Dariusz Jakubas, Anders Mosbech, Hallvard Strøm, Emmanuel Tessier, Katarzyna Wojczulanis-Jakubas, Paco Bustamante, Jérôme Fort
Coordinateurs de la collaboration
Marina RENEDO |
Jérôme Fort |