Sediment Microbial Community Structure and Mercury Methylation in Mercury-Polluted Clear Lake, California
AUTOR(ES)
Macalady, J. L.
FONTE
American Society for Microbiology
RESUMO
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 water sulfate, total mercury concentrations, and organic matter C/N ratios showed no relationships 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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=92011Documentos Relacionados
- Organomercurial-volatilizing bacteria in the mercury-polluted sediment of Minamata Bay, Japan.
- Depth Distribution of Microbial Diversity in Mono Lake, a Meromictic Soda Lake in California
- Measurement of Mercury Methylation in Lake Water and Sediment Samples
- Relationships between Microbial Community Structure and Hydrochemistry in a Landfill Leachate-Polluted Aquifer
- Nitrogen Fixation Dynamics of Two Diazotrophic Communities in Mono Lake, California