Kapitel 7: Reumés
7.3 Resumé 2003: Acoustic individual monitoring over six years

Individual recognition, territorial and partnership fidelity of cranes evaluated by sonography

Introduction

C
ranes are impressive birds occurring in 15 species in all continents (except South-America) of the world. 11 of the 15 species are endangered due to general loss of breeding habitats (wetlands). Not only for better protection and reintroduction strategies, but also for a deeper understanding of their behaviour, a thorough monitoring of partner and territory changes over years is indispensable for all crane species.

Such monitoring is - until now - only feasible when banding birds. However, banding requires specific know how, official authorisation and is usually limited by the fact, that banding is easier with catching young unfledged birds.

This results - even in broader programs - in that only in a few cases by luck 2 banded birds are mating. Therefore, there are also attempts to catch adult paired cranes (by anesthesizing them) which is quite complicate and not free from risks.

Both for behaviour research, as for endangered species conservation and general nature protection reasons, an identification method without disturbing the birds or risking any losses, hence from distance, and a method which can be practised without huge financial investments, by individuals and by teams, is desirable.

zurück weiter
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