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Extremophiles

, Volume 12, Issue 4, pp 491–504 | Cite as

Novelty and spatio–temporal heterogeneity in the bacterial diversity of hypersaline Lake Tebenquiche (Salar de Atacama)

  • Cecilia Demergasso
  • Lorena Escudero
  • Emilio O. Casamayor
  • Guillermo Chong
  • Vanessa Balagué
  • Carlos Pedrós-Alió
Original Paper

Abstract

Lake Tebenquiche is one of the largest saline water bodies in the Salar de Atacama at 2,500 m above sea level in northeastern Chile. Bacteria inhabiting there have to deal with extreme changes in salinity, temperature and UV dose (i.e., high environmental dissimilarity in the physical landscape). We analyzed the bacterioplankton structure of this lake by 16S rRNA gene analyses along a spatio–temporal survey. The bacterial assemblage within the lake was quite heterogeneous both in space and time. Salinity changed both in space and time ranging between 1 and 30% (w/v), and total abundances of planktonic prokaryotes in the different sampling points within the lake ranged between two and nine times 106 cells mL−1. Community composition changed accordingly to the particular salinity of each point as depicted by genetic fingerprinting analyses (denaturing gradient gel electrophoresis), showing a high level of variation in species composition from place to place (beta-diversity). Three selected sites were analyzed in more detail by clone libraries. We observed a predominance of Bacteroidetes (about one third of the clones) and Gammaproteobacteria (another third) with respect to all the other bacterial groups. The diversity of Bacteroidetes sequences was large and showed a remarkable degree of novelty. Bacteroidetes formed at least four clusters with no cultured relatives in databases and rather distantly related to any known 16S rRNA sequence. Within this phylum, a rich and diverse presence of Salinibacter relatives was found in the saltiest part of the lake. Lake Tebenquiche included several novel microorganisms of environmental importance and appeared as a large unexplored reservoir of unknown bacteria.

Keywords

16S rRNA gene Bacteroidetes Biodiversity Clone libraries DGGE Ecology Extremophiles Fingerprinting Gammaproteobacteria Hypersaline Salar Salt lake Tebenquiche 

Notes

Acknowledgments

Sampling and measurements carried out in Chile were funded by grants FONDECYT 1030441 and FONDEF D99I1026. Measurements carried out in Barcelona were funded by grant “ATACAMA-2002” (CICYT, BOS2002-10258-E). Grant “BIOARSENICO” from Fundación BBVA funds current work in both laboratories. EOC was supported by the Programa Ramón y Cajal and REN2003-08333, and VB by grant GENμMAR (CTM2004-02586/MAR), both from the Spanish Ministerio de Educación y Ciencia. LEG was supported by the Centro de Investigación Científica y Tecnológica para la Minería, Antofagasta, Chile. We thank Juan José Pueyo for suggestions to improve the manuscript.

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Copyright information

© Springer 2008

Authors and Affiliations

  • Cecilia Demergasso
    • 1
    • 2
  • Lorena Escudero
    • 2
    • 5
  • Emilio O. Casamayor
    • 3
  • Guillermo Chong
    • 2
    • 4
  • Vanessa Balagué
    • 5
  • Carlos Pedrós-Alió
    • 5
  1. 1.Centro de BiotecnologíaUniversidad Católica del NorteAntofagastaChile
  2. 2.Centro de Investigación Científica y Tecnológica para la MineríaRegión de AntofagastaChile
  3. 3.Unitat de LimnologiaCentre d’Estudis Avançats de Blanes (CSIC)BlanesSpain
  4. 4.Departamento de Ciencias GeológicasUniversidad Católica del NorteAntofagastaChile
  5. 5.Departament de Biologia Marina i Oceanografia, Institut de Ciències del MarCSICBarcelonaSpain

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