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Global patterns in bacterial diversity.

Catherine A Lozupone1, Rob Knight

  • 1Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, CO 80309, USA.

Proceedings of the National Academy of Sciences of the United States of America
|June 27, 2007
PubMed
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Salinity, not temperature or pH, is the main driver of bacterial community composition. This comprehensive study reveals sediments have the highest phylogenetic diversity, while soils show surprisingly low phylogenetic diversity.

Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Bioinformatics

Background:

  • Microbial culturing is challenging, limiting understanding of life's diversity.
  • Environmental gene sequences are crucial for studying microbial evolution.
  • Previous analyses of microbial community composition were less comprehensive.

Purpose of the Study:

  • To conduct the most extensive analysis of bacterial environmental distribution to date.
  • To identify key environmental factors shaping microbial community composition.
  • To assess phylogenetic diversity across various environments.

Main Methods:

  • Analysis of 21,752 bacterial 16S rRNA gene sequences from 111 diverse environmental studies.
  • Clustering of samples based on phylogenetic lineage similarity.

Related Experiment Videos

  • Comparison of microbial community composition against environmental factors like salinity, temperature, and pH.

    • Main Results:

    • Salinity emerged as the primary determinant of microbial community composition, surpassing temperature, pH, and other factors.
    • Sedimentary environments exhibited the highest phylogenetic diversity among all sampled types.
    • Soils, despite high species diversity, displayed below-average phylogenetic diversity.

    Conclusions:

    • Environmental salinity is a critical factor influencing bacterial evolution and community structure.
    • Sediments are hotspots of microbial phylogenetic diversity.
    • Future research should consider salinity gradients and explore under-sequenced environments to discover novel bacterial lineages.