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High methylmercury in Arctic and Subarctic ponds is related to nutrient levels in the warming Eastern Canadian Arctic

MacMillan Gwyneth A., Girard Catherine, Chételat John, Laurion Isabelle et Amyot Marc. (2015). High methylmercury in Arctic and Subarctic ponds is related to nutrient levels in the warming Eastern Canadian Arctic. Environmental Science & Technology, 49, (13), p. 7743-7753.

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URL officielle: http://dx.doi.org/doi:10.1021/acs.est.5b00763

Résumé

Permafrost thaw ponds are ubiquitous in the eastern Canadian Arctic, yet little information exists on their potential as sources of methylmercury (MeHg) to freshwaters. They are microbially active and conducive to methylation of inorganic mercury, and are also affected by Arctic warming. This multiyear study investigated thaw ponds in a discontinuous permafrost region in the Subarctic taiga (Kuujjuarapik-Whapmagoostui, QC) and a continuous permafrost region in the Arctic tundra (Bylot Island, NU). MeHg concentrations in thaw ponds were well above levels measured in most freshwater ecosystems in the Canadian Arctic (>0.1 ng L–1). On Bylot, ice-wedge trough ponds showed significantly higher MeHg (0.3–2.2 ng L–1) than polygonal ponds (0.1–0.3 ng L–1) or lakes (<0.1 ng L–1). High MeHg was measured in the bottom waters of Subarctic thaw ponds near Kuujjuarapik (0.1–3.1 ng L–1). High water MeHg concentrations in thaw ponds were strongly correlated with variables associated with high inputs of organic matter (DOC, a320, Fe), nutrients (TP, TN), and microbial activity (dissolved CO2 and CH4). Thawing permafrost due to Arctic warming will continue to release nutrients and organic carbon into these systems and increase ponding in some regions, likely stimulating higher water concentrations of MeHg. Greater hydrological connectivity from permafrost thawing may potentially increase transport of MeHg from thaw ponds to neighboring aquatic ecosystems.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0013-936X
Volume:49
Numéro:13
Pages:p. 7743-7753
Version évaluée par les pairs:Oui
Date:2015
Identifiant unique:10.1021/acs.est.5b00763
Sujets:Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie
Sciences naturelles et génie > Sciences appliquées > Eau et environnement
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Sciences naturelles et génie > Sciences naturelles > Chimie
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:Mercury, methylmercury, thaw pond, Arctic, Subarctic, lake, mercure, méthylmercure, eaux de fonte, arctique, subarctique, lac
Déposé le:23 juill. 2021 15:52
Dernière modification:23 juill. 2021 15:52
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