Document Detail

Cadmium and lead exposure associated with reduced growth rates, poorer fledging success of little blue heron chicks (Egretta caerulea) in south Louisiana wetlands.
MedLine Citation:
PMID:  10473795     Owner:  NLM     Status:  MEDLINE    
Persistent contaminants in ecosystems are often monitored via organisms that bioaccumulate the pollutant of interest. Several published studies have used colonial wading birds to assess contamination by heavy metals in aquatic ecosystems. Using a nonlethal sampling regimen, this study identified chick feathers and guano as tissues that best reflect local contamination. Both cadmium and lead were detected in food samples (0.3-4.3 microg/g Cd, 0.8-9.3 microg/g Pb), guano (0.2-3.2 microg/g Cd, 1.0-9.5 microg/g Pb), and feathers (0.6-25.4 microg/g Cd, 1.2-16.9 microg/g Pb) from little blue heron chicks at levels similar to other studies. Chicks exposed to cadmium had significantly slower growth rates than nonexposed chicks, and exposure to lead was correlated with increased nestling mortality. The appropriate scale of comparison necessary to demonstrate these effects and the usefulness of wading birds as bioindicators are discussed.
S A Spahn; T W Sherry
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Archives of environmental contamination and toxicology     Volume:  37     ISSN:  0090-4341     ISO Abbreviation:  Arch. Environ. Contam. Toxicol.     Publication Date:  1999 Oct 
Date Detail:
Created Date:  1999-10-21     Completed Date:  1999-10-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0357245     Medline TA:  Arch Environ Contam Toxicol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  377-84     Citation Subset:  IM    
Trinity School, 107 S. Greenlawn Ave, South Bend, Indiana 46617, USA.
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MeSH Terms
Birds / growth & development*,  metabolism
Cadmium / pharmacokinetics,  toxicity*
Dose-Response Relationship, Drug
Environmental Monitoring
Environmental Pollutants / pharmacokinetics,  toxicity*
Lead / pharmacokinetics,  toxicity*
Reg. No./Substance:
0/Environmental Pollutants; 7439-92-1/Lead; 7440-43-9/Cadmium

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

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