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Related Experiment Videos

Warm brain and eye temperatures in sharks.

B A Block, F G Carey

    Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
    |January 1, 1985
    PubMed
    Summary

    Mako and porbeagle sharks maintain warmer brain and eye temperatures than surrounding water using a specialized heat-exchange system. This adaptation likely enhances their sensory and neurological functions in dynamic marine environments.

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    Area of Science:

    • Marine Biology
    • Comparative Physiology
    • Ichthyology

    Background:

    • Sharks exhibit diverse thermoregulatory strategies.
    • Endothermy in elasmobranchs is a key area of research.
    • Understanding adaptations in active predators is crucial.

    Purpose of the Study:

    • To investigate the thermoregulation of brain and eyes in Lamnidae sharks.
    • To identify the anatomical structures responsible for temperature regulation.
    • To explore the functional implications of elevated brain and eye temperatures.

    Main Methods:

    • Comparative analysis of brain and eye temperatures in various shark species.
    • Examination of cranial vasculature, specifically the orbital rete mirabile.
    • Correlation of anatomical findings with physiological temperature differences.

    Main Results:

    • Mako and porbeagle sharks exhibit brain and eye temperatures 5°C warmer than ambient water.
    • Other pelagic sharks maintain brain and eye temperatures close to ambient water.
    • An orbital rete mirabile, a vascular heat exchanger, was identified in mako and porbeagle sharks but absent in others.

    Conclusions:

    • The orbital rete mirabile functions as a heat exchanger, conserving metabolic heat and elevating brain/eye temperatures in mako and porbeagle sharks.
    • This thermoregulatory system may buffer the central nervous system against rapid temperature fluctuations.
    • Warmed retinas could enhance visual sensitivity, benefiting these active predatory sharks.

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