Document Detail

Influence of trophic position and spatial location on polychlorinated biphenyl (PCB) bioaccumulation in a stream food web.
MedLine Citation:
PMID:  18504959     Owner:  NLM     Status:  MEDLINE    
We tested the ability of delta15N-derived trophic position (TP) to predict polychlorinated biphenyl (PCB) concentrations in a historically contaminated stream (Twelvemile Creek, SC). We analyzed sediment, four types of organic matter, 27 macroinvertebrate taxa, and 25 fish species from six sites spanning 25 stream km. SigmaPCBs were high across sites (mean fish = 2505 ng g(-1) wet), with little spatial variation in concentrations within a trophic level. SigmaPCBs (wet weight) were significantly positively correlated with TP (r2 = 0.56) and lipids (r2 = 0.44), and concentrations increased 1-2 orders of magnitude among trophic levels. After adjusting for lipids, we calculated a food web magnification factor of 1.6 for SigmaPCBs, which is low compared to marine and lentic food webs. The predictive power of TP for individual congeners increased with Kow (octanol-water partition coefficient), with regression slope approximately 0.48 and r2 approximately 0.70 for Kow > 6.5. The proportion of high Kow compounds increased with distance from the source and with trophic position. Spatial variation in congener patterns was high, in contrast to marine and lentic systems where variation is typically low.
David M Walters; Ken M Fritz; Brent R Johnson; James M Lazorchak; Frank H McCormick
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Environmental science & technology     Volume:  42     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2008 Apr 
Date Detail:
Created Date:  2008-05-28     Completed Date:  2008-08-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2316-22     Citation Subset:  IM    
National Exposure Research Laboratory, U.S. Environmental Protection Agency, 26 W. MLK Blvd., Cincinnati, Ohio 45268, USA.
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MeSH Terms
Food Chain*
Fresh Water
Polychlorinated Biphenyls / metabolism*
Reg. No./Substance:
0/Polychlorinated Biphenyls

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

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