The male songs of gomphocerine grasshoppers are produced by vibrations of the temina resulting from the impact of a row of pegs on the inside of the hind femora against a specialised wing vein. Several hypotheses have been proposed about the parameters releasing responses of the female or other male of the same species. A new computer-aided method is demonstrated an being appropriate for 'microscopic' analysis of structural features via acoustical parameters. This is demonstrated with respect to influences of temperature. A special Fourier transformation converts information in the form of variations in amplitude with time into variations in power at different frequencies. This has been combined with an averaging method of several Fourier-sheaves. These methods are also qualified to evaluate individual and species-specific traits.
Abstract: