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Applied and Environmental Microbiology, June 2008, p. 3899-3907, Vol. 74, No. 12
0099-2240/08/$08.00+0     doi:10.1128/AEM.02883-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Characterization of a Bacterial Community in an Abandoned Semiarid Lead-Zinc Mine Tailing Site{triangledown} ,{dagger}

Monica O. Mendez,{ddagger} Julia W. Neilson, and Raina M. Maier*

Department of Soil, Water and Environmental Science, University of Arizona, 429 Shantz Building No. 38, Tucson, Arizona 85721

Received 20 December 2007/ Accepted 13 April 2008

Bacterial diversity in mine tailing microbial communities has not been thoroughly investigated despite the correlations that have been observed between the relative microbial diversity and the success of revegetation efforts at tailing sites. This study employed phylogenetic analyses of 16S rRNA genes to compare the bacterial communities present in highly disturbed, extremely (pH 2.7) and moderately (pH 5.7) acidic lead-zinc mine tailing samples from a semiarid environment with those from a vegetated off-site (OS) control sample (pH 8). Phylotype richness in these communities decreased from 42 in the OS control to 24 in the moderately acidic samples and 8 in the extremely acidic tailing samples. The clones in the extremely acidic tailing sample were most closely related to acidophiles, none of which were detected in the OS control sample. The comparison generated by this study between the bacteria present in extremely acidic tailing and that in moderately acidic tailing communities with those in an OS control soil provides a reference point from which to evaluate the successful restoration of mine tailing disposal sites by phytostabilization.

* Corresponding author. Mailing address: Department of Soil, Water and Environmental Science, University of Arizona, 429 Shantz Building No. 38, Tucson, AZ 85721. Phone: (520) 621-7231. Fax: (520) 621-1647. E-mail: rmaier{at}ag.arizona.edu

{triangledown} Published ahead of print on 18 April 2008.

{dagger} Supplemental material for this article may be found at http://aem.asm.org/.

{ddagger} Present address: 423 Harcourt, San Antonio, TX 78223.

Applied and Environmental Microbiology, June 2008, p. 3899-3907, Vol. 74, No. 12
0099-2240/08/$08.00+0     doi:10.1128/AEM.02883-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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