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Comparison of the microbial communities of hot springs waters and the microbial biofilms in the acidic geothermal area of Copahue (Neuquén, Argentina)

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Abstract

Copahue is a natural geothermal field (Neuquén province, Argentina) dominated by the Copahue volcano. As a consequence of the sustained volcanic activity, Copahue presents many acidic pools, hot springs and solfataras with different temperature and pH conditions that influence their microbial diversity. The occurrence of microbial biofilms was observed on the surrounding rocks and the borders of the ponds, where water movements and thermal activity are less intense. Microbial biofilms are particular ecological niches within geothermal environments; they present different geochemical conditions from that found in the water of the ponds and hot springs which is reflected in different microbial community structure. The aim of this study is to compare microbial community diversity in the water of ponds and hot springs and in microbial biofilms in the Copahue geothermal field, with particular emphasis on Cyanobacteria and other photosynthetic species that have not been detected before in Copahue. In this study, we report the presence of Cyanobacteria, Chloroflexi and chloroplasts of eukaryotes in the microbial biofilms not detected in the water of the ponds. On the other hand, acidophilic bacteria, the predominant species in the water of moderate temperature ponds, are almost absent in the microbial biofilms in spite of having in some cases similar temperature conditions. Species affiliated with Sulfolobales in the Archaea domain are the predominant microorganism in high temperature ponds and were also detected in the microbial biofilms.

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Acknowledgments

This work was partially supported by Grants PIP 0348 (CONICET), PICT-2012-0623 (ANPCYT) and MICINN-Spain (CGL2011-22540).

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Authors and Affiliations

  1. CINDEFI (CCT La Plata-CONICET, UNLP), calle 50 entre 115 y 116 N° 227 La Plata, Buenos Aires, Argentina

    María Sofía Urbieta & Edgardo Donati

  2. Centro de Astrobiología (INTA - CSIC), Carretera de Ajalvir Km. 4, 28850, Torrejón de Ardoz, Madrid, Spain

    Elena González-Toril & Ángeles Aguilera Bazán

  3. Dpto. Química, Facultad de Ingeniería, Universidad Nacional del Comahue. IDEPA (CONICET-UNCo), Buenos Aires 1400, 8300, Neuquén, Argentina

    María Alejandra Giaveno

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  1. María Sofía Urbieta
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  2. Elena González-Toril
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  4. María Alejandra Giaveno
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Correspondence to María Sofía Urbieta.

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Communicated by A. Oren.

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Urbieta, M.S., González-Toril, E., Bazán, Á.A. et al. Comparison of the microbial communities of hot springs waters and the microbial biofilms in the acidic geothermal area of Copahue (Neuquén, Argentina). Extremophiles 19, 437–450 (2015). https://doi.org/10.1007/s00792-015-0729-2

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