Feeding-station Use of Wintering Japanese Cranes Grus japonensis in Eastern Hokkaido in Relation to Age and Social Status

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In two winters during the period 1994 to 1996, social status and feeding-station use of Japanese Cranes Grus japonensis were observed for 38(1994-95) and 40 (1995-96) marked individuals at three major feeding stations in Kushiro, northern Japan. Most of the males and females three years of age or older uttered unison calls to form a pair bond, whilst only a few younger cranes called in unison. Younger cranes appeared at the stations earlier in autumn and some of them frequently moved among the stations throughout the winter months. After pair formation, pairs appeared at the stations later than younger cranes and were more apt to visit a particular station, especially when they were with their juveniles.This station selectivity was observed most often in January and February.The cranes at the different stations showed a different degree of station selectivity and pattern of inter-station movement. These differences in selectivity and movement probably depended mainly on the feeding conditions at the stations and on the distance between stations.
日本鳥学会の論文