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Pit organ-based infrared discrimination sensitivity and signal transduction in the Burmese python (Python molurus
Sherri A Emer1, Michael S Grace2, Cordula V Mora3
1Department of Biological Sciences, Florida Gulf Coast University, Fort Myers, FL 33965 USA.
Behavioural Brain Research
|May 5, 2022
Summary
Burmese pythons possess a highly sensitive infrared (IR) sensing system for survival. This study reveals their IR system detects subtle thermal changes, but the TRPA1 protein is not essential for this IR detection.
Area of Science:
- Sensory biology
- Animal behavior
- Thermoreception
Background:
- Burmese pythons utilize an infrared (IR) system for prey detection, predator avoidance, and thermoregulation.
- Previous studies faced limitations in habituating pythons and assessing the behavioral role of the TRPA1 protein in IR sensing.
Purpose of the Study:
- To analyze the behavioral sensitivity and signal transduction of the Burmese python's IR system using conditioned discrimination.
- To investigate the behavioral function of the TRPA1 protein in the python's IR detection capabilities.
Main Methods:
- Conditioned discrimination procedures were employed to train pythons to differentiate thermal stimuli.
- Pit organ occlusion with IR-blocking material was used to assess the necessity of these organs for IR detection.
- TRPA1 inhibitor treatment was applied to pythons to evaluate the protein's role in behavioral responses to thermal stimuli.
Main Results:
- Pythons achieved 70% accuracy in discriminating thermal stimuli, with performance dropping to chance levels when pit organs were occluded.
- Enhanced sensitivity was observed, with pythons responding to a 14 × 10-6 W cm-2 irradiance contrast or a 0.5°C thermal differential.
- TRPA1 inhibition did not impair python performance, indicating this protein is not solely responsible for the observed IR sensitivity.
Conclusions:
- The Burmese python's IR system is a high-sensitivity, broad-spectrum thermosensor.
- The IR system may involve multiple thermoreceptive proteins with overlapping spectral sensitivities.
- Understanding this system enhances knowledge of brain-behavior-environment interactions crucial for the python's ecological success, particularly as an invasive species.
