Get access

Copper tolerance in iron-reducing bacteria: Implications for copper mobilization in sediments

Authors

  • James T. Markwiese,

    1. Environmental Microbiology and Biogeochemistry Laboratory, Department of Zoology and Physiology, University of Wyoming, Laramie, Wyoming 82071–3166, USA
    Search for more papers by this author
  • Joseph S. Meyer,

    1. Environmental Microbiology and Biogeochemistry Laboratory, Department of Zoology and Physiology, University of Wyoming, Laramie, Wyoming 82071–3166, USA
    Search for more papers by this author
  • Patricia J.S. Colberg

    Corresponding author
    1. Environmental Microbiology and Biogeochemistry Laboratory, Department of Zoology and Physiology, University of Wyoming, Laramie, Wyoming 82071–3166, USA
    • Environmental Microbiology and Biogeochemistry Laboratory, Department of Zoology and Physiology, University of Wyoming, Laramie, Wyoming 82071–3166, USA
    Search for more papers by this author

Abstract

Iron-reducing bacteria enriched from a Cu-contaminated sediment were more tolerant of Cu adsorbed to hydrous ferric oxide (HFO) than were pristine-sediment bacteria. Tolerance was enhanced by increasing the Cu concentration in the culture medium over time, enabling the bacteria to begin reducing Cu-contaminated HFO sooner and at a faster rate than Cu-intolerant bacteria. Copper tolerance confers a greater ability to reduce contaminated HFO and may result in a greater potential for Cu mobilization in sediments.

Ancillary