Document Detail


Overview and regional and temporal differences of heavy metals in Arctic whales and ringed seals in the Canadian Arctic.
MedLine Citation:
PMID:  8685709     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Concentrations of mercury, cadmium, and other heavy metals in tissues of belugas (Delphinapterus leucas), narwhal (Monodon monoceros) and ringed seals (Phoca hispida) from across the Canadian Arctic are reported. Published and new information is used to provide an overview of metals in tissues of these animals, to delineate the existence of a spatial trend of mercury and cadmium in belugas and ringed seals, and to show a temporal trend is superimposed on the geochemical trend. Mercury concentrations in tissues of Arctic whales and ringed seals were high relative to the Canadian guideline of 0.5 micrograms/g wet wt., for mercury in fish, except in the skin of belugas (0.59-0.78 micrograms/g wet wt.) and flesh of ringed seals (0.39-0.41 micrograms/g wet wt.). In the flesh of belugas (0.94-1.34 micrograms/g wet wt.), and in the liver of ringed seals, tissues that are also consumed by Native people in the Arctic (8.34-27.5 micrograms/g wet wt.), the guideline value was significantly exceeded. Mean lead concentrations in tissues of belugas, narwhal and ringed seals were generally low (0.002-0.028 micrograms/g wet wt.), except in tissues of belugas in the St. Lawrence River (0.10-0.15 micrograms/g wet wt.). The concentration of zinc in the skin of whales was two to three times higher than in other tissues. The concentration of cadmium in organs was highest in narwhal. There was a positive correlation between mercury and selenium in the liver of all three species. The concentration of mercury in tissues of belugas and ringed seals was higher in the western than the eastern Arctic. This was attributed to different natural background concentrations in the western and eastern Arctic of Canada dictated by different geological formations in the two regions. Cadmium concentrations in tissues of belugas and ringed seals were higher in the eastern than the western Arctic. Zinc and copper in some tissues of belugas and ringed seals were also higher in the eastern than the western Arctic. Mercury in the liver of belugas was found to have increased in the western and eastern Arctic over 10-12 years. Mercury in the liver of ringed seals in the western Arctic and narwhal in the eastern Arctic showed similar increases. In recently collected belugas, the rate of accumulation of mercury in the liver was approximately twice that in belugas collected 10-12 years ago. In ringed seals, the rate was three times higher in recent samples compared to 15-20 years ago. There was no temporal change in cadmium levels in tissues of belugas, ringed seals or narwhal.
Authors:
R Wagemann; S Innes; P R Richard
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Science of the total environment     Volume:  186     ISSN:  0048-9697     ISO Abbreviation:  Sci. Total Environ.     Publication Date:  1996 Jul 
Date Detail:
Created Date:  1996-08-22     Completed Date:  1996-08-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0330500     Medline TA:  Sci Total Environ     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  41-66     Citation Subset:  IM    
Affiliation:
Department of Fisheries and Oceans, Central and Arctic Region, Freshwater Institute, Winnipeg, Manitoba, Canada.
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MeSH Terms
Descriptor/Qualifier:
Analysis of Variance
Animals
Arctic Regions
Cadmium / analysis,  metabolism
Canada
Copper / analysis,  metabolism
Fishes / metabolism
Kidney / metabolism
Lead / analysis,  metabolism
Liver / metabolism
Mercury / analysis,  metabolism
Metals / analysis,  metabolism*
Muscles / metabolism
Reference Standards
Seals, Earless / metabolism*
Selenium / analysis,  metabolism
Skin / metabolism
Species Specificity
Tissue Distribution
Whales / metabolism*
Zinc / analysis,  metabolism
Chemical
Reg. No./Substance:
0/Metals; 7439-92-1/Lead; 7439-97-6/Mercury; 7440-43-9/Cadmium; 7440-50-8/Copper; 7440-66-6/Zinc; 7782-49-2/Selenium

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


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