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Neural Code for Ambient Heat Detection in Elaterid Beetles.

Enno Merivee1, Anne Must1, Karin Nurme1

  • 1Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Tartu, Estonia.

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Summary

Insects use spike bursting in their antennae to sense dangerous high temperatures. This burst firing pattern, not the average rate, reliably encodes heat levels crucial for survival.

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antennal dome-shaped sensillabimodal thermohygroreceptor neuroninsectsperipheral spike burstingthermoreceptor neuron

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Area of Science:

  • Neuroethology
  • Insect sensory physiology
  • Thermoregulation

Background:

  • Environmental temperature significantly impacts biological organization and survival.
  • Noxious high temperature sensation is critical for behavioral thermoregulation in small ectotherms like insects.
  • Previous studies identified heat encoding via spike bursting in a carabid beetle's antennal sensory neurons.

Purpose of the Study:

  • To investigate heat encoding mechanisms in the antennal sensory triad of the elaterid beetle, *Agriotes obscurus*.
  • To determine if spike bursting is a conserved mechanism for noxious heat sensation in insects.
  • To identify key neural parameters encoding high temperatures in insect antennae.

Main Methods:

  • Extracellular single sensillum recordings were performed on *Agriotes obscurus* antennae.
  • Recordings were conducted across a temperature range of 20-45°C, including noxious heat levels.
  • Analysis focused on various spike train parameters, including inter-spike intervals (ISI) within bursts.

Main Results:

  • The sensory triad in *Agriotes obscurus* generates temperature-dependent bursty spike trains in response to high temperatures.
  • Specific burst parameters, particularly ISI, effectively encode a graded range of heat up to lethal levels.
  • The mean firing rate of neurons did not provide reliable information at high, noxious temperatures.

Conclusions:

  • Spike bursting is a fundamental and widespread mechanism for coding noxious high temperatures in insect antennal thermo- and hygro-thermoreceptor neurons.
  • This sensory coding strategy offers flexibility and reliability for insect survival in challenging thermal environments.
  • The findings suggest spike bursting plays a significant role in insect behavioral thermoregulation.