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Cool Bands: Wing bands decrease rate of heating, but not equilibrium temperature in Anartia fatima.

Jake Brashears1, Annette Aiello2, Brett M Seymoure3

  • 1Department of Life Sciences, San Diego City College, San Diego 92101, United States.

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Butterfly wing bands may help regulate body temperature. Darkening wing bands increased heating rate but did not change equilibrium temperature, suggesting a role in managing heat stress.

Keywords:
Butterfly ColorationRadiationReflectanceThermoregulation

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Area of Science:

  • Zoology
  • Physiology
  • Ecology

Background:

  • Butterflies (Insecta: Lepidoptera) need to regulate thoracic temperature for optimal performance.
  • Wing coloration and structure are known to influence butterfly thermoregulation.
  • The role of specific wing markings, like bands, in thermal properties requires further investigation.

Purpose of the Study:

  • To investigate the effect of wing band coloration on the thermal properties of the banded peacock butterfly (Anartia fatima).
  • To determine the contribution of wing bands and outer wing portions to thermoregulation in Anartia fatima.

Main Methods:

  • Two within-subject experiments were conducted on euthanized Anartia fatima.
  • Experiment 1: Compared thermal equilibrium with unaltered vs. darkened wing bands under illumination.
  • Experiment 2: Compared thermal equilibrium after partial (banded area removed) vs. complete wing removal.

Main Results:

  • Darkening the wing band did not alter the final thoracic equilibrium temperature but increased the rate of heating.
  • Wing removal (both partial and complete) decreased the internal thoracic equilibrium temperature.
  • Wing removal did not significantly affect the rate of heating.

Conclusions:

  • Butterfly wing bands may play a role in thermoregulation, potentially by influencing heat absorption rates.
  • The wing band's primary function in thermoregulation might be to modulate heat stress in warm environments.
  • Wing removal experiments highlight the overall importance of wings in maintaining body temperature.