Kapitel 5: Der Mandschurenkranich (grus japonensis)
5. Unison call structure ("pattern")
This is the most complicated to find out, as we do not have a computer based "pattern analysis" available. The qualitative comparison of many sonograms showed indeed some striking pattern differences:
- whereas the J-RC m display a rather uniform inverse U or V form call, with the "right" (= downside, ending phase) often having a "rough" (= many frequencies in parallel overlaid) structure, the K-RC m show many different forms, and quite seldom an inverse U or V, if at all
- K-RC m often show instead of this an upward step in the middle of the call tact, and on the down side (towards the end) very seldom the "rough" part
- J-RC f have very sharp, steep inverse V's with a high frequency range within an extremely short time period; sometimes, the "V" is no more there, just an overlay of about 6 - 8 frequencies is to be seen as the answer call
- K-RC f show longer answer calls, also with many frequencies, but not as many as in J-RC f, sometimes, the call gets so long that it takes the form of a male call! it is characteristic, that the form of the f calls can vary strongly within even one unison call display.