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Frogs and turtles: different ectotherm overwintering strategies.

D G Penney

    Comparative Biochemistry and Physiology. A, Comparative Physiology
    |January 1, 1987
    PubMed
    Summary

    Frogs and turtles exhibit distinct overwintering strategies. Turtles tolerate anoxia through metabolic suppression, akin to hibernation, while frogs are more oxygen-dependent due to higher cutaneous permeability.

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    Area of Science:

    • Comparative physiology
    • Ectotherm biology
    • Anoxia tolerance

    Background:

    • Overwintering survival in ectotherms like frogs and turtles is crucial.
    • Understanding physiological adaptations to cold and low-oxygen environments is limited.
    • Distinct strategies likely exist between different ectotherm groups.

    Purpose of the Study:

    • To compare the overwintering physiological mechanisms of frogs and turtles.
    • To investigate the differential tolerance to hypoxia and anoxia in these species.
    • To elucidate the role of cutaneous permeability and metabolic suppression.

    Main Methods:

    • Review of existing physiological data on frog and turtle overwintering.
    • Comparative analysis of metabolic rates and oxygen dependence.
    • Examination of cutaneous respiration and anoxia tolerance.

    Main Results:

    • Frogs demonstrate greater oxygen limitation during overwintering compared to turtles.
    • Turtles exhibit extreme anoxia tolerance and profound metabolic suppression, indicative of hibernation.
    • Frog cutaneous permeability appears to be a key factor in their oxygen dependency.

    Conclusions:

    • Turtle overwintering is best described as hibernation, not prolonged diving.
    • Diving abilities in turtles are a consequence of their successful overwintering strategy.
    • Significant physiological differences dictate varied overwintering success in frogs and turtles.

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