Document Detail


Rapid changes in small fish mercury concentrations in estuarine wetlands: implications for wildlife risk and monitoring programs.
MedLine Citation:
PMID:  20028067     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Small fish are commonly used to assess mercury (Hg) risk to wildlife and monitor Hg in wetlands. However, limited research has evaluated short-term Hg variability in small fish, which can have important implications for monitoring programs and risk assessment. We conducted a time-series study of Hg concentrations in two small fish species representing benthic (longjaw mudsuckers [Gillichthys mirabilis]) and pelagic (threespine sticklebacks [Gasterosteus aculeatus]) food-webs within three wetland habitats in San Francisco Bay Estuary. We simultaneously monitored prey deliveries, nest initiation, and chick hatching dates of breeding Forster's terns (Sterna forsteri), the most abundant nesting piscivore in the region. Mudsuckers and sticklebacks were the predominant prey fish, comprising 36% and 25% of tern diet, and Hg concentrations averaged (geometric mean +/- SE, microg/g dw) 0.44 +/- 0.01 and 0.68 +/- 0.03, respectively. Fish Hg concentrations varied substantially over time following a quadratic form in both species, increasing 40% between March and May then decreasing 40% between May and July. Importantly, Forster's terns initiated 68% of nests and 31% of chicks hatched during the period of peak Hg concentrations in prey fish. These results illustrate the importance of short-term temporal variation in small fish Hg concentrations for both Hg monitoring programs and assessing wildlife risk.
Authors:
Collin A Eagles-Smith; Joshua T Ackerman
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Environmental science & technology     Volume:  43     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2009 Nov 
Date Detail:
Created Date:  2009-12-23     Completed Date:  2010-01-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  8658-64     Citation Subset:  IM    
Affiliation:
U.S. Geological Survey, Western Ecological Research Center, Davis Field Station, One Shields Avenue, University of California, Davis, California 95616, USA. ceagles-smith@usgs.gov
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MeSH Terms
Descriptor/Qualifier:
Animals
Animals, Wild
Body Size / physiology*
Environmental Monitoring*
Fishes / metabolism*
Food Chain
Fresh Water
Mercury / metabolism*
Water Pollutants, Chemical / chemistry,  metabolism*
Wetlands
Chemical
Reg. No./Substance:
0/Water Pollutants, Chemical; 7439-97-6/Mercury

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


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