Abstract

When crickets ( Gryllus bimaculatus) produce their calling, courtship and rivalry songs, they generate, in addition to the audible stridulatory sound, low-frequency air oscillations associated with the inward and outward movements of the forewings. The frequencies of these oscillations are below ca 70 Hz, with a major component at 30 Hz, the syllable repetition rate. In the courtship song, single oscillations are also produced. Jerking movements of the whole body, which often occur in the presence of rivals, cause considerable air currents. In all these cases the air vibrations are sufficient to be perceived both by the individual generating them and by conspecifics (and perhaps by other insects) via air-flow receptors, in crickets the cercal filiform hairs.

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