Kapitel 5: Der Mandschurenkranich (grus japonensis)

6. Guard calls

Generally, K-RC display much more GC than J-RC do. Moreover, many GC of K-RC sound completely different. Whereas the J-RC GC is more like we know GC from other crane species, the K-RC can display both the "normal" GC as also a "chatter", sounding more like a flight call.

Conclusions

T
here is strong evidence that mainland China RC have a different "language" than the RC from Japan do.

It might be of interest that I have not succeeded in provoquing a unison call (or even a guard call) from a K-RC using J-RC unison calls (which I have on CD and replayed via megaphone). Not a single reaction based on this. GC were only displayed towards us when we were seen and in their view too close to the pair.

Several features of the calls, like

  • length
  • number of female answer calls in one tact
  • complexity of frequency pattern
  • level of main frequency of both males and females
  • the call pattern itself (the call "structure")
  • and the sound and form of the guard call

show basic differences between Japan and China / Korea.

This supports the hypothesis that the Japanese population was separated from the mainland since sufficiently long time to allow the development of at least a "dialect", if not a completely different "language". My impression is, that the differences are as strong as between RC and Whooper Cranes.

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Hauptmenue | Vorwort | Kap 1: Bild und Ton | Kap 2: Kranicharten | Kap 3: Kennenlernen, Verhalten und Intelligenz
Kap 4: Graue Kraniche | Kap 5: Mandschurenkraniche | Kap 6: Schreikraniche | Kap 7: Resumés | Kap 8: Anhang