In another even broader study in Mecklenburg near Goldberg, we will build a database comprising around 90 pairs in 635 km² observation area for a long-term monitoring; 28 pairs have been acoustically characterised as a first step. 2 new pairs have been found in a densely populated small moor, 2 new occupied territories (visually unknown) in a forest. The sonographical monitoring will be part of the continuous visual observation going on there since many years, which is accompanied by banding and radio-tracking work.
International projectsI n Japan (Hokkaido), we have begun to build the basis for a longer term monitoring with the resident red-crowned cranes. Recording of spontaneous unison calls at winter feeding stations showed the feasibility, as well as did a later recording (using provocation by playing calls from CD via megaphone) in 16 breeding territories in South and Northeast Hokkaido.
Even later, it was possible to record unison calls of pairs with at least one banded crane individual at winter feeding station. These pairs can be followed over the years even in winter, provided that they will call in the presence of a recorder .
The analysis of these calls was the basis for a comparison of Japanese red-crowned crane unison calls with those from mainland China. These calls have been recorded by me in winter 99/00 in the Demilitarised Zone between North- and South-Korea, where a significant portion of Chinese red-crowned cranes (and also white naped cranes) is- wintering.