Abstract
We investigated the steering responses of tethered, flying adult female crickets (Teleogryllus oceanicus) to acoustic stimulation. Crickets responded directionally to directional sound stimulation by bending their abdomens and hind legs to one side. We interpret this response as an attempt to turn. When stimulated with a model of conspecific calling song with a carrier frequency of from 3 to 9 kHz, crickets turned toward the sound source. We believe that this indicates a positive phonotactic response of flying females to calling, conspecific males. When offered a choice between conspecific song and the song of another species, females turned exclusively toward conspecific song, demonstrating that the response is species specific. The direction of the response is dependent on the carrier frequency of the song, and it demonstrates frequency discrimination. Females turned toward calling song when it was played at carrier frequencies from 3 to 9 kHz, but they turned away from the same song pattern played at carrier frequencies from 30 to 70 kHz. This negative phonotaxis to ultrasonic stimuli suggests that crickets, like some other nocturnal flying insects, can evade bats by acoustic detection.
Keywords: phonotaxis, acoustic communication, neuroethology, frequency discrimination, insect hearing
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