Journal
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
Volume 66, Issue 4, Pages 1479-1488Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.66.4.1479-1488.2000
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- NIEHS NIH HHS [2P42 ES04699, P42 ES004699] Funding Source: Medline
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Spatial and temporal variations in sediment microbial community structure in a eutrophic lake polluted with inorganic mercury were identified using polar lipid fatty acid (PLFA) analysis, Microbial community structure was strongly related to mercury methylation potential , sediment organic carbon content, and lake location. Pore a ater sulfate, total mercury concentrations, and organic matter C/N ratios showed no relation ships with microbial community structure. Seasonal changes and changes potentially attributable to temperature regulation of bacterial membranes were detectable but were less important influences on sediment PLFA composition than were differences due to lake sampling location. Analysis of biomarker PLFAs characteristic of Desulfobacter and Desulfovibrio groups of sulfate-reducing bacteria suggests that Desulfobacter-like organisms are important mercury methylators in the sediments, especially in the Lower Arm of Clear Lake.
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