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Surface-associated growth.

D C Ellwood, C W Keevil, P D Marsh

    Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
    |June 11, 1982
    PubMed
    Summary
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    Microbial communities thrive on surfaces in low-nutrient environments. Surface-attached bacteria in carbon-limited conditions grew twice as fast as free-floating cells, suggesting nutrient availability influences microbial growth.

    Area of Science:

    • Microbiology
    • Environmental Science
    • Biogeochemistry

    Background:

    • Microbial activity in natural ecosystems is often surface-dependent, especially in nutrient-poor conditions.
    • Chemostats provide controlled environments to study microbial growth in low-nutrient settings.

    Purpose of the Study:

    • To investigate microbial community attachment and growth on surfaces under different nutrient limitations.
    • To compare surface-associated growth rates with planktonic growth rates.

    Main Methods:

    • Enrichment cultures were established using inocula from river sources in chemostats.
    • Nutrient limitations were manipulated (carbon vs. nitrogen).
    • Growth rates of surface-associated and free-living bacteria were measured.

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    Main Results:

    • Carbon-limited conditions promoted a more diverse surface-attached microbial community compared to nitrogen-limited conditions.
    • A specific pseudomonad species exhibited approximately double the growth rate when attached to a surface versus when free-living in the medium.
    • This enhanced surface growth was observed in carbon-limited cultures.

    Conclusions:

    • Nutrient availability significantly influences microbial community structure and attachment to surfaces.
    • Surface colonization can lead to substantially increased growth rates for certain microorganisms.
    • The findings support hypotheses related to surface-enhanced microbial growth, potentially explained by chemiosmotic principles.