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Related Experiment Videos

Acclimation, temperature selection, and heat exchange in the turtle, Chrysemys scripta

L I Crawshaw, M H Johnston, D E Lemons

    The American Journal of Physiology
    |May 1, 1980
    PubMed
    Summary

    Turtles quickly seek warm environments, preferring temperatures between 31-33°C. Their body temperature adjusts rapidly, but heart rate is mainly influenced by heart temperature, not brain temperature.

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    Area of Science:

    • Physiology
    • Behavioral Ecology
    • Thermoregulation

    Background:

    • Understanding reptile thermoregulation is crucial for predicting responses to environmental changes.
    • Turtles exhibit behavioral thermoregulation, selecting specific ambient temperatures to maintain optimal physiological function.

    Purpose of the Study:

    • To investigate the thermal preferendum and behavioral thermoregulation in turtles.
    • To quantify the rate of body temperature change in turtles under different thermal conditions.
    • To determine the relationship between heart rate and body, heart, and brain temperatures.

    Main Methods:

    • Turtles were placed in a thermal gradient to assess preferred temperatures.
    • Calorimetry was used to monitor body and organ temperatures (heart, brain, cloaca) during thermal transfers.

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  • Heart rate was continuously monitored alongside temperature changes.

    • Main Results:

    • Turtles selected a thermal preferendum of 31-33°C within an hour.
    • Body temperature (Tb), heart temperature (The), and cloacal temperature (Tcl) reached two-thirds of the final temperature difference within minutes (Tb: 5.5 min, The: 6.0 min, Tcl: 9.0 min).
    • Heart rate was closely correlated with heart temperature and largely independent of brain temperature, showing minimal response to rapid ambient temperature shifts.

    Conclusions:

    • Turtles actively regulate their body temperature by selecting preferred thermal environments.
    • Internal body temperatures equilibrate relatively quickly, with variations in brain temperature depending on head position.
    • Heart rate is primarily governed by heart temperature, indicating a direct physiological link to thermal state.