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Article Dans Une Revue Environmental Chemistry Année : 2012

The fate of mercury in Arctic terrestrial and aquatic ecosystems, a review

Lisa L. Loseto
  • Fonction : Auteur
Robie Macdonald
  • Fonction : Auteur
Peter Outridge
  • Fonction : Auteur
Alexandre Poulain
  • Fonction : Auteur
Tamar Barkay
  • Fonction : Auteur
John Chételat
  • Fonction : Auteur
Philippe Constant
  • Fonction : Auteur
Marlene Evans
  • Fonction : Auteur
Nikolaus Gantner
  • Fonction : Auteur
Matthew S. Johnson
  • Fonction : Auteur
Jane Kirk
  • Fonction : Auteur
Niels Kroer
  • Fonction : Auteur
Catherine Larose
David Lean
  • Fonction : Auteur
Torkel Gissel Nielsen
  • Fonction : Auteur
Sigurd Rognerud
  • Fonction : Auteur
Henrik Skov
Søren Sørensen
  • Fonction : Auteur
Feiuye Wang
  • Fonction : Auteur
Simon Wilson
  • Fonction : Auteur
Christian M. Zdanowicz
  • Fonction : Auteur

Résumé

This review is the result of a series of multidisciplinary meetings organised by the Arctic Monitoring and Assessment Programme as part of their 2011 Assessment 'Mercury in the Arctic'. This paper presents the state-of-the-art knowledge on the environmental fate of mercury following its entry into the Arctic by oceanic, atmospheric and terrestrial pathways. Our focus is on the movement, transformation and bioaccumulation of Hg in aquatic (marine and fresh water) and terrestrial ecosystems. The processes most relevant to biological Hg uptake and the potential risk associated with Hg exposure in wildlife are emphasised. We present discussions of the chemical transformations of newly deposited or transported Hg in marine, fresh water and terrestrial environments and of the movement of Hg from air, soil and water environmental compartments into food webs. Methylation, a key process controlling the fate of Hg in most ecosystems, and the role of trophic processes in controlling Hg in higher order animals are also included. Case studies on Eastern Beaufort Sea beluga (Delphinapterus leucas) and landlocked Arctic char (Salvelinus alpinus) are presented as examples of the relationship between ecosystem trophic processes and biologic Hg levels. We examine whether atmospheric mercury depletion events (AMDEs) contribute to increased Hg levels in Arctic biota and provide information on the links between organic carbon and Hg speciation, dynamics and bioavailability. Long-term sequestration of Hg into non-biological archives is also addressed. The review concludes by identifying major knowledge gaps in our understanding, including: (1) the rates of Hg entry into marine and terrestrial ecosystems and the rates of inorganic and MeHg uptake by Arctic microbial and algal communities; (2) the bioavailable fraction of AMDE-related Hg and its rate of accumulation by biota and (3) the fresh water and marine MeHg cycle in the Arctic, especially the marine MeHg cycle.

Dates et versions

hal-00846180 , version 1 (18-07-2013)

Identifiants

Citer

Thomas A. Douglas, Lisa L. Loseto, Robie Macdonald, Peter Outridge, Aurélien Dommergue, et al.. The fate of mercury in Arctic terrestrial and aquatic ecosystems, a review. Environmental Chemistry, 2012, 9 (4), pp.321-355. ⟨10.1071/EN11140⟩. ⟨hal-00846180⟩
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