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Applied and Environmental Microbiology, October 1998, p. 3791-3797, Vol. 64, No. 10
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Manganese Reduction by Microbes from Oxic Regions of the Lake Vanda (Antarctica) Water Column

Bonnie Jo Bratina,1,dagger Bradley S. Stevenson,1 William J. Green,2 and Thomas M. Schmidt1,*

Department of Microbiology and Center for Microbial Ecology, Michigan State University, East Lansing, Michigan 48824,1 and School of Interdisciplinary Studies, Miami University, Oxford, Ohio 450562

Received 30 March 1998/Accepted 23 July 1998

Depth profiles of metals in Lake Vanda, a permanently ice-covered, stratified Antarctic lake, suggest the importance of particulate manganese oxides in the scavenging, transport, and release of metals. Since manganese oxides can be solubilized by manganese-reducing bacteria, microbially mediated manganese reduction was investigated in Lake Vanda. Microbes concentrated from oxic regions of the water column, encompassing a peak of soluble manganese [Mn(II)], reduced synthetic manganese oxides (MnO2) when incubated aerobically. Pure cultures of manganese-reducing bacteria were readily isolated from waters collected near the oxic Mn(II) peak. Based on phylogenetic analysis of the 16S rRNA gene sequence, most of the isolated manganese reducers belong to the genus Carnobacterium. Cultures of a phylogenetically representative strain of Carnobacterium reduced synthetic MnO2 in the presence of sodium azide, as was seen in field assays. Unlike anaerobes that utilize manganese oxides as terminal electron acceptors in respiration, isolates of the genus Carnobacterium reduced Mn(IV) via a diffusible compound under oxic conditions. The release of adsorbed trace metals accompanying the solubilization of manganese oxides may provide populations of Carnobacterium with a source of nutrients in this extremely oligotrophic environment.

* Corresponding author. Mailing address: Department of Microbiology, Giltner Hall, Michigan State University, East Lansing, MI 48824-1101. Phone: (517) 353-1796. Fax: (517) 353-8957. E-mail: tschmidt{at}pilot.msu.edu.

dagger Present address: Department of Biology and Microbiology, University of Wisconsin---La Crosse, La Crosse, WI 54601.

Applied and Environmental Microbiology, October 1998, p. 3791-3797, Vol. 64, No. 10
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


This article has been cited by other articles:

  • Laybourn-Parry, J., Pearce, D. A (2007). The biodiversity and ecology of Antarctic lakes: models for evolution. Phil Trans R Soc B 362: 2273-2289 [Abstract] [Full Text]  
  • Gilbert, B., Banfield, J. F. (2005). Molecular-Scale Processes Involving Nanoparticulate Minerals in Biogeochemical Systems. Reviews in Mineralogy and Geochemistry 59: 109-155 [Full Text]  


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