Are thermophilic microorganisms active in cold environments?

Charles S. Cockell, Claire Rachel Cousins, Paul T. Wilkinson, Karen Olsson-Francis, Ben Rozitis

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    The mean air temperature of the Icelandic interior is below 10 °C. However, we have previously observed 16S rDNA sequences associated with thermophilic lineages in Icelandic basalts. Measurements of the temperatures of igneous rocks in Iceland showed that solar insolation of these low albedo substrates achieved a peak surface temperature of 44.5 °C. We isolated seven thermophilic Geobacillus species from basalt with optimal growth temperatures of ~65 °C. The minimum growth temperature of these organisms was ~36 °C, suggesting that they could be active in the rock environment. Basalt dissolution rates at 40 °C were increased in the presence of one of the isolates compared to abiotic controls, showing its potential to be involved in active biogeochemistry at environmental temperatures. These data raise the possibility of transient active thermophilic growth in macroclimatically cold rocky environments, implying that the biogeographical distribution of active thermophiles might be greater than previously understood. These data show that temperatures measured or predicted over large scales on a planet are not in themselves adequate to assess niches available to extremophiles at micron scales.
    Original languageEnglish
    Pages (from-to)457-463
    Number of pages7
    JournalInternational Journal of Astrobiology
    Volume14
    Issue number3
    Early online date10 Nov 2014
    DOIs
    Publication statusPublished - Jul 2015

    Keywords

    • Thermophiles
    • Extremophiles
    • Volcanic
    • Mars
    • Geomicrobiology

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