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Related Experiment Videos

Thermal sensitivity in lichens.

J D Macfarlane, K A Kershaw

    Science (New York, N.Y.)
    |August 25, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Desiccated lichens show varying heat resistance. Some populations are sensitive to moderate heat, while others are highly resistant, correlating with their ecological niches.

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    Area of Science:

    • Ecology
    • Plant Physiology
    • Environmental Stress Biology

    Background:

    • Lichens are symbiotic organisms composed of fungi and algae or cyanobacteria.
    • They are known for their ability to survive extreme environmental conditions, including desiccation.
    • Previous assumptions suggested high-temperature resistance in desiccated lichens.

    Purpose of the Study:

    • To re-examine the widely held concept of extreme heat resistance in desiccated lichens.
    • To investigate the variability in thermal tolerance among different lichen populations.
    • To determine if ecological factors correlate with observed differences in heat resistance.

    Main Methods:

    • Experimental assessment of thermal tolerance in air-dry lichen thalli.
    • Comparison of heat stress responses across lichen populations from diverse ecological settings.

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  • Correlation analysis between thermal resistance levels and specific ecological parameters.

    • Main Results:

    • Contrary to common belief, not all desiccated lichens exhibit high-temperature resistance.
    • Some lichen thalli demonstrated extreme sensitivity to moderate heat stress.
    • A significant degree of heat resistance was observed in other lichen populations.
    • Differential thermal resistance levels were found to correlate precisely with the ecology of the sampled populations.

    Conclusions:

    • The presumed universal heat resistance of desiccated lichens is not accurate.
    • Lichen thermal tolerance is population-specific and strongly linked to their ecological niche.
    • Ecological adaptation plays a critical role in determining lichen survival under heat stress.