Document Detail

Concentrations of selenium and mercury in eared grebes (Podiceps nigricollis) from Utah's Great Salt Lake, USA.
MedLine Citation:
PMID:  19173549     Owner:  NLM     Status:  MEDLINE    
We examined selenium and mercury concentrations in eared grebes (Podiceps nigricollis) that spent the fall of 2006 on the Great Salt Lake (UT, U.S.A.), where their diet consisted mainly of brine shrimp (Artemia franciscana). Selenium concentrations in livers varied based on when the grebes were collected (lower in September [mean +/- standard error, 9.4 +/- 0.7 microg/g dry wt] than in November [14.5 +/- 1.4 microg/g]), on where the birds were collected on the Great Salt Lake (Antelope Island, 8.6 +/- 0.5 +/- microg/g; Stansbury Island, 15.2 +/- 1.4 microg/g), and on the grebe's age (juveniles, 8.5 +/- 1.5 mcirog/g; adults, 15.8 +/- 1.3 microg/g), but not by sex. Selenium concentrations in blood differed only by collection site (Antelope Island, 16.8 +/- 2.3 microg/g; Stansbury Island, 25.4 +/- 3.0 microg/g). Mercury concentration in the blood of grebes varied by when the grebes were collected (September, 5.6 +/- 0.5 microg/g; November, 8.4 +/- 1.2 microg/g), where the birds were collected (Antelope Island, 4.3 +/- 0.5 microg/g; Stansbury Island, 10.1 +/- 2.6 microg/g), and the grebe's age (juveniles, 5.5 +/- 0.8 microg/g; adults, 8.4 +/- 1.0 microg/g), but not by sex. Selenium concentrations in blood were correlated with selenium concentrations in the liver and with mercury concentrations in both blood and liver. Body mass of grebes increased dramatically from September (381 +/- 14 g wet wt) to November (591 +/- 11 g). Body, liver, and spleen mass either were not correlated with selenium or mercury concentrations or the relationship was positive. These results suggest that high mercury and selenium levels were not preventing grebes from increasing or maintaining mass.
Michael R Conover; Josh L Vest
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental toxicology and chemistry / SETAC     Volume:  28     ISSN:  0730-7268     ISO Abbreviation:  Environ. Toxicol. Chem.     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-11-20     Completed Date:  2009-12-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8308958     Medline TA:  Environ Toxicol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1319-23     Citation Subset:  IM    
Wildland Resources Department, Utah State University, Logan, Utah 84322-5230, USA.
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MeSH Terms
Birds / metabolism*
Environmental Pollutants / blood,  metabolism*
Mercury / blood,  metabolism*
Selenium / metabolism*
Reg. No./Substance:
0/Environmental Pollutants; 7439-97-6/Mercury; 7782-49-2/Selenium

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

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