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• W2074616324 abstract "We measured micron-scale Fe2+/Fe3+ and intermediate sulfur species gradients across the biofilm–solution interface and defined the microbial community composition in natural and bioreactor-cultivated acid mine drainage biofilms to investigate how community organization correlated with geochemical conditions. Intermediate sulfur species concentrations were also measured in associated sediments. Under initial conditions of high Fe2+ and O2 concentrations, the first biofilm colonists were Leptospirillum Group II, UBA genotype, and a few Archaea. Cytochrome 579 concentration in early formed biofilms was high, correlating with rapid Fe2+ oxidation. As biofilm thickness increased, O2 concentrations in the middle of biofilms decreased, indicating that diffusion limitation of O2 may control activity levels of aerobic organisms. Calculated low O2 and high Fe3+ concentrations in the interior regions of biofilms may explain the previously reported suppression of the UBA genotype in mature biofilms. Instead, Leptospirillum Group II, 5-way CG genotype, dominated under these conditions. Leptospirillum Group III and eukaryotes appeared in the community as the biofilm thickened and Fe3+/Fe2+ increased. In mature biofilms, the architecture changed from planar to crenulated, perhaps to increase the surface area of biofilms and decrease O2 diffusion limitation. In thick, mature biofilms, layering is associated with segregation of Leptospirillum Group II and Archaea and the concentration of cytochrome 579 is lower. The accumulation of Archaea close to the biofilm–air interface may facilitate their aerobic metabolism of waste carbon compounds. Sulfite, thiosulfate and polysulfides were detected in AMD sediments and thiosulfate was detected in solution. These compounds indicate the redox status of the system and represent potential energy sources. Temporal and spatial heterogeneity in community structure correlate with heterogeneity in geochemical conditions, implying active feedbacks between geochemical conditions and microbial species distribution and activity." @default.
• W2074616324 created "2016-06-24" @default.
• W2074616324 creator A5045720453 @default.
• W2074616324 creator A5053678771 @default.
• W2074616324 date "2011-06-01" @default.
• W2074616324 modified "2023-09-27" @default.
• W2074616324 title "Micron-scale Fe2+/Fe3+, intermediate sulfur species and O2 gradients across the biofilm–solution–sediment interface control biofilm organization" @default.
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• W2074616324 doi "https://doi.org/10.1016/j.gca.2011.03.035" @default.
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