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Caterpillar setae: insulation for an ectotherm.

T M Casey, J R Hegel

    Science (New York, N.Y.)
    |December 4, 1981
    PubMed
    Summary
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    Gypsy moth caterpillars use specialized body hairs called setae for insulation. These setae reduce heat loss from convection but not radiation, with posture changes altering these thermal effects.

    Area of Science:

    • Zoology
    • Insect thermoregulation
    • Biophysics

    Background:

    • Gypsy moth caterpillars possess distinct dorsal and lateral setae.
    • Setae morphology varies across body regions, suggesting functional differences.

    Purpose of the Study:

    • To investigate the role of setae in thermal insulation for gypsy moth caterpillars.
    • To determine how setae affect convective and radiative heat exchange.
    • To examine the influence of posture on seta-mediated thermoregulation.

    Main Methods:

    • Comparative analysis of dorsal and lateral setae.
    • Measurement of convective and radiative heat exchange rates.
    • Observation of behavioral changes in posture.

    Main Results:

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    • Lateral setae are long and soft, while dorsal setae are short and stiff.
    • Setae significantly reduce convective heat loss without impacting radiative heat exchange.
    • Altering posture negates the insulating effect of setae by increasing convection and heat absorption.

    Conclusions:

    • Setae provide selective thermal insulation for gypsy moth caterpillars.
    • Posture is a critical behavioral adaptation influencing the effectiveness of seta-based thermoregulation.