Document Detail


Why do organochlorine differences between arctic regions vary among trophic levels?
MedLine Citation:
PMID:  16047766     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Statistical analysis of organochlorine contaminants (OCs) in marine mammals has shown that, for most OCs, the European Arctic is more contaminated than the Canadian and U.S. Arctic. Recently, comparison of OC concentration ranges in seabirds, arctic cod (Boregadus saida), and zooplankton, found no difference between these regions. To address these inconsistencies, marine food web OC data from the European (central Barents Sea (CBS)) and Canadian Arctic (Northwater Polynya (NOW)) were simultaneously statistically analyzed. In general, concentrations of OCs were greater in seabirds and ringed seals (Phoca hispida) from the CBS as compared to the NOW; consistent with circumpolar trends observed in marine mammals. In contrast, levels of OCs were generally similar in zooplankton and arctic cod between the CBS and NOW. The main exception is HCH which had greater levels in the NOW across all trophic levels because of the greater proximity to sources in eastern Asia. The lack of differences in OC concentrations in zooplankton and Arctic cod from the European and Canadian Arctic suggest that regional differences in OC contamination in the Arctic have evened out. Reduced regional differences were not observed in marine mammals or seabirds because they are long-lived and also acquire contaminants from maternal transfer and hence reflect levels from the past when the European Arctic was more contaminated than the Canadian Arctic. In addition, seabirds may reflect exposure from other areas. This study highlights the potential problem of comparing spatial trends by using means and confidence intervals as compared to simultaneous statistical analysis of raw data. Differences in the spatial trends of OCs between trophic levels in the Arctic are important for consideration when assessing regional differences in spatial and temporal trends of discontinued and current-use contaminants.
Authors:
Katrine Borgå; Geir Wing Gabrielsen; Janneche Utne Skaare; Lars Kleivane; Ross J Norstrom; Aaron T Fisk
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  39     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-07-28     Completed Date:  2006-02-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4343-52     Citation Subset:  IM    
Affiliation:
Norwegian Polar Institute, N-9296 Tromsø, Norway. katrine.borga@npolar.no
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MeSH Terms
Descriptor/Qualifier:
Analysis of Variance
Animals
Arctic Regions
Ecosystem*
Environmental Monitoring / methods,  statistics & numerical data*
Environmental Pollutants / analysis*
Food Chain*
Gas Chromatography-Mass Spectrometry
Hydrocarbons, Chlorinated / analysis*
Lipids / analysis
Nitrogen Isotopes / analysis
Vertebrates / metabolism*
Zooplankton / metabolism*
Chemical
Reg. No./Substance:
0/Environmental Pollutants; 0/Hydrocarbons, Chlorinated; 0/Lipids; 0/Nitrogen Isotopes

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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