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Exercise warms adult leatherback turtles.

Brian L Bostrom1, David R Jones

  • 1Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada. bostrom@zoology.ubc.ca

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
|December 26, 2006
PubMed
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Leatherback sea turtles maintain a higher body temperature than surrounding water, enabling their wide distribution. Swimming speed is the primary factor in their thermal strategy, balancing heat loss and maintaining this temperature difference.

Area of Science:

  • Marine Biology
  • Animal Physiology
  • Thermoregulation

Background:

  • Leatherback sea turtles (Dermochelys coriacea) exhibit remarkable thermoregulation, maintaining body temperatures up to 18°C above ambient seawater.
  • This physiological capacity allows them to inhabit cold temperate waters, contributing to their extensive global range, the largest among reptiles.

Purpose of the Study:

  • To investigate the role of heat production via varying swim speeds in the thermal strategy of leatherback sea turtles.
  • To quantify the metabolic cost of locomotion and its contribution to maintaining body-water temperature differentials.

Main Methods:

  • A cylindrical model of a leatherback sea turtle was used to measure drag force in a wind tunnel.
  • Estimates of metabolic cost to offset drag were calculated.

Related Experiment Videos

  • A thermal model was developed, keeping insulation constant to assess the impact of swim speed on body-water temperature difference (T(B)-T(W)).

    • Main Results:

    • The study highlighted the effectiveness of swim speed in maintaining T(B)-T(W) when insulation thickness is constant.
    • The developed model showed a strong correlation between predicted and measured swimming speeds at specific body temperatures and water temperatures.
    • Drag force measurements provided estimates for the metabolic cost of locomotion.

    Conclusions:

    • The ability of leatherbacks to maintain a significant T(B)-T(W) is a result of an interplay between body mass, insulation, and water temperature selection.
    • Behavioral control of swimming speed emerges as the predominant factor in leatherback thermoregulation and habitat range.