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Related Experiment Videos

Freezing resistance in intertidal invertebrates.

D J Murphy

    Annual Review of Physiology
    |January 1, 1983
    PubMed
    Summary

    Intertidal invertebrates resist freezing by tolerating tissue ice, with injury often caused by extracellular ice formation. Mechanisms involve water binding, increased cell resistance, and anaerobic metabolism, though oxygen

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    Area of Science:

    • Marine Biology
    • Ecology
    • Physiology

    Background:

    • Intertidal invertebrates face extreme cold, tolerating ice formation within tissues.
    • Freezing resistance is crucial for survival in intertidal zones.

    Purpose of the Study:

    • To investigate the mechanisms of freezing tolerance in intertidal invertebrates.
    • To understand the causes of freezing injury and physiological adaptations.

    Main Methods:

    • Analysis of factors influencing freezing resistance, including temperature, salinity, cooling rates, and oxygen levels.
    • Examination of ice formation (extracellular vs. intracellular) and its relation to injury.
    • Investigation of physiological adaptations like water binding, cell resistance, and metabolic shifts.

    Main Results:

    • Freezing injury primarily results from extracellular ice formation, a dehydration stress causing membrane damage.
    • Intracellular ice formation can cause injury in smaller invertebrates at rapid cooling rates.
    • Adaptations include mechanisms that bind cellular water or increase cell resistance to ice.
    • Low tissue oxygen and anaerobic metabolism are linked to increased resistance to ice.
    • Calcium concentration and membrane changes may play roles in enhanced freezing tolerance.

    Conclusions:

    • Intertidal invertebrates possess complex strategies to survive freezing temperatures.
    • Understanding these mechanisms, particularly the role of oxygen, is vital for predicting species' responses to environmental changes.
    • Further research is needed on the link between oxygen and extracellular ice injury.

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