Document Detail


Are brook trout streams in western Virginia and Shenandoah National Park recovering from acidification?
MedLine Citation:
PMID:  15352446     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Streamwater composition data obtained through periodic sampling of streams that support brook trout (Salvelinus fontinalis) in the mountains of western Virginia were examined for evidence of recovery from acidification during the 1988-2001 period. Measurements of sulfate deposition in precipitation indicate that sulfate deposition in the region declined approximately 40% between 1985 and 2000. While no significant regional trends in acid-base constituents were observed for the set (n = 65) of western Virginia study streams, significant regional trends were observed for a subset (n = 14) of streams in Shenandoah National Park (SNP). For the subset of SNP streams, the median increase in acid-neutralizing capacity (ANC) was 0.168 microequiv L(-1) year(-1) and the median decrease in sulfate concentration was -0.229 microequiv L(-1) year(-1). Although these trends are consistent with recovery from acidification, the degree of apparent recovery is small compared to estimates of historic acidification in SNP streams and much less than observed in other, more northern regions in the United States. Correlation between sulfate concentration trends and current sulfate concentrations in streamwater suggests that recovery from stream acidification in the western Virginia region is determined by sulfur retention processes in watershed soils. A transient increase in nitrate concentrations that occurred among some western Virginia streams following forest defoliation by the gypsy moth (Lymantria dispar) complicates interpretation of the observed patterns of change in acid-base status.
Authors:
James R Webb; Bernard J Cosby; Frank A Deviney; James N Galloway; Suzanne W Maben; Arthur J Bulger
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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:  38     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2004 Aug 
Date Detail:
Created Date:  2004-09-08     Completed Date:  2005-01-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4091-6     Citation Subset:  IM    
Affiliation:
Department of Environmental Sciences, University of Virginia, 291 McCormick Road, Charlottesville, Virginia 22904, USA. rwebb@virginia.edu
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MeSH Terms
Descriptor/Qualifier:
Acid Rain / analysis
Acids / analysis
Animals
Hydrogen-Ion Concentration
Nitrates / analysis
Rivers / chemistry
Sulfates / analysis*
Trout
Virginia
Water Pollution, Chemical / analysis*,  statistics & numerical data
Chemical
Reg. No./Substance:
0/Acid Rain; 0/Acids; 0/Nitrates; 0/Sulfates

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


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