Why are insect antennae important for thermoreception?

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thermoreception in polar bears — Thermoreception Warm-blooded animals, such as polar bears, maintain stable body temperatures and adapt to substantial geographic and seasonal temperature fluctuations. Thermal adaptation is supported by the function of sensory structures called thermoreceptors.

In most insects, the antennae serve as the primary location for thermoreceptors, which are essential for detecting and responding to environmental temperature changes.1

The importance of these structures is supported by two main types of evidence:

Behavioral Studies: Research shows that insects often exhibit impaired thermoreceptive behavior—such as the inability to navigate toward or away from heat sources—when their antennae are partially or entirely removed.1
Electrophysiological Recordings: Scientists have used microelectrodes to record electrical activity near presumed thermosensitive cells within the antennae. These studies confirm that specific cells respond to temperature stimuli, such as the cold receptors found in the antennae of cockroaches and various moth caterpillars.1

For many species, such as the bloodsucking assassin bug, these antennal thermoreceptors are critical for survival, as they allow the insect to detect and move toward warm stimuli, such as a potential host. While other sensory structures may be influenced by temperature, their primary roles are typically chemoreceptive or mechanoreceptive, reinforcing the antenna's specialized function in thermal sensing.1