Document Detail


Effect of microbes on contaminant transfer in the Lake Superior food web.
MedLine Citation:
PMID:  16475328     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The partitioning of PCBs to natural populations of aquatic heterotrophic bacteria from Lake Superior was measured in both field and laboratory studies to better understand the role of bacteria and the microbial food web in persistent, bioaccumulative, toxic organic contaminant (PBT) transfer. A filtration method that separated material >1 microm from that <1 microm was used to collect and measure PCB concentrations in the bacterial fraction. We used bacterial biovolume and a conversion factor to calculate bacterial carbon, which was used to normalize PCB concentrations. The range of total PCB concentrations in the bacterial fraction (61-337 ng/g organic carbon; OC) was similar, but generally higher than that of the total particulate fraction (36-324 ng/g OC). Measured log bioaccumulation factors (BAFoc, bacterial fraction; Koc, total particulate) were significantly greater in the bacterial fraction than in the total particulate fraction (bacterial range 6.7-7.3, total particulate range 5.8-7.0). Laboratory experiments demonstrated that a hexachlorobiphenyl reached steady state with a natural community of Lake Superior bacteria within 48 h and had a mean log BAFoc of 7.5 +/- 1.9. The octanol/ water partition coefficient (Kow) consistently under-predicted BAFoc, however, the magnitude of the under-prediction was still within the range of uncertainty in food web modeling (factors of 3-9). Food web modeling and risk assessment of PBT bioaccumulation in aquatic systems could be improved by considering the microbial food web (bacteria and its protozoan grazers) as a previously unaccounted for pathway of contaminant transfer.
Authors:
Matthew J Hudson; Deborah L Swackhamer; James B Cotner
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Environmental science & technology     Volume:  39     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2006-02-14     Completed Date:  2006-05-03     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:  9500-8     Citation Subset:  IM    
Affiliation:
Environmental Health Sciences and Water Resources Sciences Program, Mayo Mail Code 807, University of Minnesota, Minneapolis, Minnesota 55455, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Bacteria / metabolism*
Biotransformation*
Carbon / analysis,  metabolism
Environmental Pollutants / analysis,  metabolism*
Food Chain
Great Lakes Region
Michigan
Polychlorinated Biphenyls / analysis,  metabolism*
Time Factors
Water Microbiology*
Chemical
Reg. No./Substance:
0/Environmental Pollutants; 0/Polychlorinated Biphenyls; 7440-44-0/Carbon

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


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