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Bumblebee thermoregulation at increasing temperatures is affected by behavioral state.

Guadalupe Sepúlveda-Rodríguez1, Kevin T Roberts1, Priscila Araújo1

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Rising temperatures impact bumblebee thermoregulation. Bumblebees adjust body heat based on behavior, with evidence of heat transfer for flight, showing adaptable thermal regulation.

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Area of Science:

  • Insect physiology
  • Environmental biology
  • Thermoregulation

Background:

  • Global temperature increases are linked to insect population declines.
  • Endoheterothermic insects like bumblebees possess thermoregulatory abilities for cold climates.
  • The impact of rising temperatures on bumblebee thermoregulation remains unclear.

Purpose of the Study:

  • To investigate bumblebee (Bombus terrestris) thermoregulation across varying temperatures and behaviors.
  • To understand how environmental temperature affects bumblebee body heat.
  • To determine if bumblebees exhibit plastic and behavior-dependent thermoregulatory responses.

Main Methods:

  • Measuring head, thoracic, and abdominal temperatures of bumblebee workers.
  • Conducting measurements across a temperature range of 24°C to 32°C.
  • Observing bumblebees during resting, pre-flight, and post-flight behaviors.

Main Results:

  • Resting bumblebees' body temperatures matched environmental temperatures.
  • Pre-flight bumblebees showed elevated head and abdominal temperatures, indicating muscle warming.
  • Post-flight bumblebees demonstrated abdominal temperature increases with environmental temperature, while head and thorax did not.
  • Heat transfer from thorax to abdomen aids thermoregulation during flight.
  • Flight speed and foraging activity increased with temperature.

Conclusions:

  • Bumblebee thermoregulation is plastic and dependent on behavior.
  • Bumblebees actively manage heat transfer for thermoregulation during flight.
  • Despite impacts on performance, bumblebees continue foraging and flying at higher temperatures.