Is the Ramped Shape of Pulses in the Song of Grasshoppers Adaptive for Directional Hearing?

摘要

In many grasshopper species the songs of males and females differ with respect to the shape of pulses, which are rectangularly modulated in the song of males but show a rhombic shape with slowly rising ramps in the female stridulation signal. The shape of pulses is decisive for males to recognize female response song: males readily turn towards and approach a loudspeaker emitting female song models consisting of ramped pulses, but they do not turn towards song models with rectangularly modulated pulses.