Mercury isotopes of key tissues document mercury metabolic processes in seabirds
| Autor: | David Amouroux, Paco Bustamante, Zoyne Pedrero, Yves Cherel, Marina Renedo |
|---|---|
| Přispěvatelé: | LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs), Université de La Rochelle (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), Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC), Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis 0208 environmental biotechnology Petrel chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Zooplankton Excretion Birds moult chemistry.chemical_compound Environmental Chemistry Animals 14. Life underwater detoxification Methylmercury 0105 earth and related environmental sciences Trophic level biology Chemistry Public Health Environmental and Occupational Health demethylation methylmercury General Medicine General Chemistry Mercury Methylmercury Compounds biology.organism_classification Pollution 020801 environmental engineering Mercury (element) Mercury Isotopes 13. Climate action Environmental chemistry Feather visual_art [SDE]Environmental Sciences visual_art.visual_art_medium Moulting metabolism Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Chemosphere Chemosphere, Elsevier, 2021, 263, pp.127777. ⟨10.1016/j.chemosphere.2020.127777⟩ |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2020.127777⟩ |
| Popis: | Seabirds accumulate significant amounts of mercury (Hg) due to their long-life span together with their medium to high trophic position in marine food webs. Hg speciation and Hg isotopic analyses of total Hg in different tissues (pectoral muscles, liver, brain, kidneys, blood and feathers) were assessed to investigate their detoxification mechanisms. Three species with contrasted ecological characteristics were studied: the Antarctic prion (zooplankton feeder), the white-chinned petrel (pelagic generalist consumer) and the southern giant petrel (scavenger on seabirds and marine mammals). The difference of mass-dependent fractionation (MDF, δ202Hg) values between liver and muscles (up to 0.94 ‰) in all three seabirds strongly suggests hepatic demethylation of the isotopically lighter methylmercury (MeHg) and subsequent redistribution of the isotopically heavier fraction of MeHg towards the muscles. Similarly, higher δ202Hg values in feathers (up to 1.88 ‰) relative to muscles and higher proportion of MeHg in feathers (94-97%) than muscles (30-70%) likely indicate potential MeHg demethylation in muscle and preferential excretion of MeHg (isotopically heavier) in the growing feathers during moult. The extents of these key detoxification processes were strongly dependent on the species-specific detoxification strategies and levels of dietary MeHg exposure. We also found higher mass-independent fractionation (MIF, Δ199Hg) values in feathers relative to internal tissues, possibly due to different integration times of Hg exposure between permanently active organs and inert tissues as feathers. Hg isotope variations reported in this study show evidence of detoxification processes in seabirds and propose a powerful approach for deep investigation of the Hg metabolic processes in seabirds. |
| Databáze: | OpenAIRE |
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