First evidence for a bipolar distribution of dominant freshwater lake bacterioplankton

David A. Pearce*, Charles S. Cockell, Eva S. Lindstrom, Lars J. Tranvik

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

As a result of the recent application of DNA based technology to the investigation of maritime Antarctic freshwater lakes, patterns have begun to emerge in the bacterioplankton communities that dominate these systems. In this study, the bacterioplankton communities of five Antarctic and five Arctic freshwater lakes were assessed and compared with existing data in the literature, to determine whether emerging patterns in Antarctic lakes also applied to Arctic systems. Such a bipolar comparison is particularly timely., given the current interest in biogeography, the global distribution of microorganisms and the controversy over the global ubiquity hypothesis. In addition, it has recently been discovered that commonly encountered bacterial sequences, often originating from uncultivated bacteria obtained on different continents, form coherent phylogenetic freshwater clusters. In this study we encountered both identical sequences and sequences with a high degree of similarity among the bacterioplankton in lake water from both poles. In addition, Arctic freshwater lakes appeared to be dominated by some of the same groups of bacterioplankton thought to be dominant in Antarctic lakes, the vast majority of which represented uncultivated groups.

Original languageEnglish
Pages (from-to)245-252
Number of pages8
JournalAntarctic science
Volume19
Issue number2
DOIs
Publication statusPublished - Jun 2007
Event9th Scar International Biology Symposium - Curitiba, Brazil
Duration: 25 Jul 200529 Jul 2005

Keywords

  • 16S rRNA gene
  • bacteria
  • biogeography
  • clone library
  • cosmopolitan
  • DGGE
  • freshwater cluster
  • 16S RIBOSOMAL-RNA
  • COMMUNITY STRUCTURE
  • GENE-SEQUENCES
  • ARCTIC-OCEAN
  • DIVERSITY
  • BACTERIA
  • MARINE
  • ACTINOBACTERIA
  • HYBRIDIZATION
  • BIODIVERSITY

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