Extremophiles

, Volume 12, Issue 4, pp 529–539

Novel halophilic aerobic anoxygenic phototrophs from a Canadian hypersaline spring system

  • Julius T. Csotonyi
  • Jolantha Swiderski
  • Erko Stackebrandt
  • Vladimir V. Yurkov
Original Paper

Abstract

The first enumeration of cultivable obligately aerobic phototrophic bacteria from a terrestrial saline spring was accomplished in the East German Creek system (salinity ∼6%), near Lake Winnipegosis, Manitoba, Canada. Occurring at densities up to 3.3 × 107 CFU/ml of sample, aerobic phototrophs comprised 15–36% of the total cultivable bacterial population in the diatom- and chlorophyte-dominated aerobic microbial mats. Many of the representative strains isolated for phenotypic characterization and phylogenetic analysis possessed <96% 16S rDNA sequence overlap with published species, including an obligately aerobic phototrophic gammaproteobacterium displaying only 92.9% 16S rDNA sequence similarity to Congregibacter litoralis. The springs yielded the most highly halotolerant aerobic anoxygenic phototroph yet recorded, strain EG11, which grew with 26% NaCl.

Keywords

Aerobic anoxygenic phototrophs Phototrophic halophiles Hypersaline springs Bacteriochlorophyll Physiology 

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Copyright information

© Springer 2008

Authors and Affiliations

  • Julius T. Csotonyi
    • 1
  • Jolantha Swiderski
    • 2
  • Erko Stackebrandt
    • 2
  • Vladimir V. Yurkov
    • 1
  1. 1.Department of MicrobiologyUniversity of ManitobaWinnipegCanada
  2. 2.DSMZ-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbHBraunschweigGermany

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