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Microbial Diversity in Acidic Anaerobic Sediments at the Geothermal Caviahue-Copahue System, Argentina

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Abstract:

In this work we have examined the bacterial diversity from the hot spring sediment Agua del Limón (AL1) present at the geothermal Caviahue-Copahue system using a combination of molecular and cultivation techniques, with particular emphasis on indigenous anaerobic prokaryotes. Microorganisms involved in the iron (Acidithiobacillus ferrooxidans and Leptospirillum spp.) and sulphur (Acidithiobacillus spp., Thermotogales-like bacteria, Thiomonas sp., and Desulfurella sp.) cycles were identified in the clone library. Although no obvious sulfate-reducing bacteria were detected by culture-independent techniques, several isolates related to the mesophilic, spore-forming sulfate-reducer "Desulfobacillus acidavidus" strain CL4 were isolated at 30°C and 40°C. The 16S rRNA gene of another isolate showed 94% similarity to Desulfotomaculum thermobenzoicum. Sulfate-reducing enrichment cultures of the Copahue samples were also dominated by "Dsb. acidavidus" CL4.

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Periodical:

Advanced Materials Research (Volume 825)

Pages:

7-10

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.825.7

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Online since:

October 2013

Authors:

Graciana Willis, Sabrina Hedrich, Ivan Nancucheo, D. Barrie Johnson, Edgardo R. Donati

Keywords:

Caviahue-Copahue, Sulfate-Reducing Bacteria (SRB), T-RFLP

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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