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Basal mercury concentrations and biomagnification rates in freshwater and marine food webs: Effects on Arctic charr (Salvelinus alpinus) from eastern Canada.
MedLine Citation:
PMID:  23295180     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Patterns of total Hg (THg) and methyl Hg (MeHg) biomagnification were investigated in six pairs of co-located lacustrine and marine food webs supporting a common predator, Arctic charr. Mercury biomagnification rates (the slope of log Hg concentration versus δ(15)N-inferred trophic level) did not differ significantly between the two feeding habitats for either THg or MeHg, but THg and MeHg concentrations at the base of the food web were higher in the lacustrine environment than in the marine environment. The proportion of THg as MeHg was related to trophic level, and the relationship was statistically similar in the lacustrine and marine habitats. The biomagnification rate of MeHg exceeded that of THg in both habitats. We conclude that the known difference in Hg concentration between anadromous and non-anadromous Arctic charr is driven by differential Hg concentrations at the base of the lacustrine and marine foodwebs, and not by differential biomagnification rates.
Authors:
S van der Velden; J B Dempson; M S Evans; D C G Muir; M Power
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-4
Journal Detail:
Title:  The Science of the total environment     Volume:  444C     ISSN:  1879-1026     ISO Abbreviation:  Sci. Total Environ.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0330500     Medline TA:  Sci Total Environ     Country:  -    
Other Details:
Languages:  ENG     Pagination:  531-542     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier B.V. All rights reserved.
Affiliation:
Department of Biology, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1. Electronic address: sdorn@uwaterloo.ca.
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