BioAcoustica is a free, open repository of wildlife sound recordings from the Natural History Museum, London.
Taxonomic index of the BioAcoustica collection
Acoustic and biological measurements in the BioAcoustica collection
Recording annotations from ann-o-mate
The specimens that recordings are of, from the collections
Where the specimens that recordings are of were collected, not where the sound was recorded
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.