Document Detail

Embryotoxic thresholds of mercury: estimates from individual mallard eggs.
MedLine Citation:
PMID:  12520398     Owner:  NLM     Status:  MEDLINE    
Eighty pairs of mallards ( Anas platyrhynchos) were fed an uncontaminated diet until each female had laid 15 eggs. After each female had laid her 15th egg, the pair was randomly assigned to a control diet or diets containing 5, 10, or 20 microg/g mercury as methylmercury until she had laid a second set of 15 eggs. There were 20 pairs in each group. After the second set of 15 eggs, the pair was returned to an uncontaminated diet, and the female was permitted to lay another 30 eggs. For those pairs fed the mercury diets, the even-numbered eggs were incubated and the odd-numbered eggs were saved for possible mercury analysis. Mercury in the even-numbered eggs was estimated as the average of what was in the neighboring odd-numbered eggs. Neurological signs of methylmercury poisoning were observed in ducklings that hatched from eggs containing as little as 2.3 microg/g estimated mercury on a wet-weight basis, and deformities were seen in embryos from eggs containing about 1 microg/g estimated mercury. Although embryo mortality was seen in eggs estimated to contain as little as 0.74 microg/g mercury, there were considerable differences in the sensitivity of mallard embryos, especially from different parents, with some embryos surviving as much as 30 or more microg/g mercury in the egg.
G H Heinz; D J Hoffman
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Archives of environmental contamination and toxicology     Volume:  44     ISSN:  0090-4341     ISO Abbreviation:  Arch. Environ. Contam. Toxicol.     Publication Date:  2003 Feb 
Date Detail:
Created Date:  2003-01-09     Completed Date:  2003-02-21     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0357245     Medline TA:  Arch Environ Contam Toxicol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  257-64     Citation Subset:  IM    
Patuxent Wildlife Research Center, U.S. Geological Survey, 11510 American Holly Drive, Laurel, Maryland 20708-4017, USA.
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MeSH Terms
Ducks / embryology*
Embryo, Nonmammalian / drug effects
Embryonic Development*
Mercury / adverse effects*,  pharmacokinetics*
Nervous System / embryology*
Reg. No./Substance:

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