Gomphocerus transcaucasicus

The male calling song of Gomhocerus transcaucasicus is different from G. sibiricus. The differences are: syllables lasting 180-350 ms (in G. sibiricus 100 ms); at the end of the echeme, lower intensity syllables absent (in G. sibiricus present and duration of this second part greatly varies, from 2 to 11 s); a syllable consists of the two types of pulses: pulses of the higher amplitude repeated at higher rate alternate with the low-amplitude pulses repeated at lower rate. The pulses of the two types also differ in duration. Especially this quite interesting feature discriminate G. trans- caucasicus from G. sibiricus [in G. sibiricus, syllables contain pulses of only one type, produced mainly by downstroke of the femora (Ragge & Reynolds 1998, Bukhvalova & Vedenina 1998)].

Song: Calling song consists of an echeme lasting 16-20 s and composed of about 30-60 syllables (Fig. 3a). The echeme begins quietly, gradually becoming louder (crescendo) and is reached often the first 20-25 syllables to maximum intensity (Fig. 3b). Each syllable lasts 1800-350 ms and consists of 155-25 pulses (Fig. 3c). Oscillographic analysis shows that a syllable consists of the two types of pulses: pulses of the higher amplitude repeated at higher rate alternate with the low-amplitude pulses repeated at lower rate (Fig. 3d). The pulses of the two types also differ in duration. [1]

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