Abstract
ABSTRACT The first songs produced by newly adult Poecilimon schmidti (Fieber) are shown to be composed of pure tone bursts. At this time the file is in its pristine condition. After a week of stridulatory activity the songs of the same individual start to be contaminated with anharmonic components, arising from wear damage that occurs to the file teeth and plectrum. The disruption of the pure tone burst adds other elements to the Fourier spectra so that they now become difficult to interpret. The number of plectrum-tooth impacts, normally 2–5, also varies with ageing. Although females responded well to old males there is a possibility that the change in song quality would enable the female to discriminate between males.
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