Abstract
Bacterial diversity in alkaline (pH 10.4) and permanently cold (4°C) ikaite tufa columns from the Ikka Fjord, SW Greenland, was investigated using growth characterization of cultured bacterial isolates with Terminal-restriction fragment length polymorphism (T-RFLP) and sequence analysis of bacterial 16S rRNA gene fragments. More than 200 bacterial isolates were characterized with respect to pH and temperature tolerance, and it was shown that the majority were cold-active alkaliphiles. T-RFLP analysis revealed distinct bacterial communities in different fractions of three ikaite columns, and, along with sequence analysis, it showed the presence of rich and diverse bacterial communities. Rarefaction analysis showed that the 109 sequenced clones in the 16S rRNA gene library represented between 25 and 65% of the predicted species richness in the three ikaite columns investigated. Phylogenetic analysis of the 16S rRNA gene sequences revealed many sequences with similarity to alkaliphilic or psychrophilic bacteria, and showed that 33% of the cloned sequences and 33% of the cultured bacteria showed less than 97% sequence identity to known sequences in databases, and may therefore represent yet unknown species.
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Acknowledgments
We thank Bente M. Smith and Karin Vestberg for excellent technical skills, Mads Johnsen and Flemming Jørgensen for stimulating discussions. Referring to the Convention on Biological Diversity, we thank the Greenland Home Rule for permission to sample ikaite columns from the Ikka Fjord, SW Greenland. This work was partly funded by the Danish Agency for Trade and Industry (MS and PS) and by the Oticon foundation (MS).
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Schmidt, M., Priemé, A. & Stougaard, P. Bacterial diversity in permanently cold and alkaline ikaite columns from Greenland. Extremophiles 10, 551–562 (2006). https://doi.org/10.1007/s00792-006-0529-9
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DOI: https://doi.org/10.1007/s00792-006-0529-9