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Mercury Stable Isotopes in Seabird Eggs Reflect a Gradient from Terrestrial Geogenic to Oceanic Mercury Reservoirs.
MedLine Citation:
PMID:  22519440     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Elevated mercury concentrations ([Hg]) were found in Alaskan murre (<italic>Uria spp.</italic>) eggs from the coastal embayment of Norton Sound relative to insular colonies in the northern Bering Sea-Bering Strait region. Stable isotopes of Hg, carbon, and nitrogen were measured in the eggs to investigate the source of this enrichment. Lower δ<sup>13</sup>C values in Norton Sound eggs (-23.3 ‰ to -20.0 ‰) relative to eggs from more oceanic colonies (-20.9 ‰ to -18.7 ‰) indicated that a significant terrestrial carbon source was associated with the elevated [Hg], implicating the Yukon River and smaller Seward Peninsula watersheds as the likely Hg source. The increasing [Hg] gradient extending inshore was accompanied by strong decreasing gradients of δ<sup>202</sup>Hg and Δ<sup>199</sup>Hg in eggs, indicating lower degrees of mass-dependent (MDF) and mass-independent Hg fractionation (MIF) (respectively) in the Norton Sound food web. Negative or zero MDF and MIF signatures are typical of geological Hg sources, which suggests murres in Norton Sound integrated Hg from a more recent geological origin that has experienced a relatively limited extent of aquatic fractionation relative to more oceanic colonies. The association of low δ<sup>202</sup>Hg and Δ<sup>199</sup>Hg with elevated [Hg] and terrestrial δ<sup>13</sup>C values suggested that Hg stable isotopes in murre eggs effectively differentiated terrestrial/geogenic Hg sources from oceanic reservoirs.
Authors:
Rusty Davis Day; David G Roseneau; Sylvain Berail; Keith Hobson; Olivier F X Donard; Stacy S Vander Pol; Rebecca S Pugh; Amanda J Moors; Steve E Long; Paul R Becker
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-21
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-4-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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