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Pineal function in sparrows: circadian rhythms and body temperature.

S Binkley, E Kluth, M Menaker

    Science (New York, N.Y.)
    |October 15, 1971
    PubMed
    Summary
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    The pineal organ is crucial for house sparrows' biological clock, regulating body temperature rhythms and activity. Removing it disrupts circadian patterns and affects thermoregulation.

    Area of Science:

    • Ornithology
    • Chronobiology
    • Physiology

    Background:

    • Circadian rhythms govern daily physiological and behavioral cycles in birds.
    • The pineal organ is a key component of the biological clock system.
    • Thermoregulation is vital for avian survival and metabolic function.

    Purpose of the Study:

    • To investigate the role of the pineal organ in regulating body temperature rhythms in house sparrows (Passer domesticus).
    • To determine the impact of pinealectomy on circadian body temperature patterns under different light conditions.

    Main Methods:

    • Continuous monitoring of deep body temperature using radio telemetry in house sparrows.
    • Surgical pinealectomy to assess the organ's function.
    • Exposure to constant darkness and controlled light cycles.

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    Main Results:

    • Pinealectomy abolished circadian body temperature rhythms in constant darkness.
    • The amplitude of body temperature rhythms entrained to light cycles was significantly altered post-pinealectomy.
    • Pinealectomized birds exhibited higher body temperature minima compared to unoperated controls.
    • Body temperature maxima were higher in light than in darkness for both normal and pinealectomized birds.

    Conclusions:

    • The pineal organ is essential for the normal functioning of the biological clock controlling activity and body temperature rhythms in sparrows.
    • The pineal organ may play a direct role in thermoregulation in this species.