Journal
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
Volume 113, Issue G4, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2008JG000738
Keywords
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Funding
- EPA-CEER-GOM (PAN) [R-82945801]
- United States National Science Foundation [9807697]
- United States Department of Energy (DOE)
- Virtual Institute for Microbial Stress and Survival
- Office of Science
- Office of Biological and Environmental Research
- Genomics Program
- GTL [DE-AC02-05CH11231]
- American Association of University Women (AAUW)
- DuPont-Northwestern-Dow Collaborative Access Team (DND-CAT) Synchrotron Research Center
- E. I. DuPont de Nemours Co.
- Dow Chemical Company
- U.S. National Science Foundation [DMR-9304725]
- State of Illinois through the Department of Commerce
- Board of Higher Education
- IBHE HECA NWU [96]
- Office of Basic Energy Sciences [W-31-109-Eng-38]
- Div Of Molecular and Cellular Bioscience
- Direct For Biological Sciences [9807697] Funding Source: National Science Foundation
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Although sulfate-reducing prokaryotes have long been studied as agents of metals bioremediation, impacts of long-term metals exposure on biologically mediated sulfur cycling in natural systems remains poorly understood. The effects of long-term exposure to metal stress on the freshwater sulfur cycle were studied, with a focus on biologic sulfate reduction using a combination of microbial and chemical methods. To examine the effects after decades of adaptation time, a field-based experiment was conducted using multiple study sites in a natural system historically impacted by a nearby zinc smelter (Lake DePue, Illinois). Rates were highest at the most metals-contaminated sites (similar to 35 mmol/cm(3)/day) and decreased with decreased pore water zinc and arsenic contamination levels, while other environmental characteristics (i.e., pH, nutrient concentrations and physical properties) showed little between-site variation. Correlations were established using an artificial neural network to evaluate potentially non-linear relationships between sulfate reduction rates (SRR) and measured environmental variables. SRR in Lake DePue were up to 50 times higher than rates previously reported for lake sediments and the chemical speciation of Zn was dominated by the presence of ZnS as shown by X-ray Absorption Spectroscopy (XAS). These results suggest that long-term metal stress of natural systems might alter the biogeochemical cycling of sulfur by contributing to higher rates of sulfate reduction.
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