１９８９年の繁殖期におけるタンチョウの営巣

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  • Distribution of the Tancho Grus japonensis in the breeding season of 1989.
  • 1989ネン ノ ハンショクキ ニ オケル タンチョウ ノ エイソウ

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From 28 April-2 May 1989 we flew along rivers and over lakes and marshes in eastern Hokkaido, northern Japan, to detect the distribution and breeding status of the Tancho or the Red-crowned Crane Grus japonensis. Flying time was about 22.8 hours and the flight distance was about 3, 000km in total. Eight individuals were found incubating on nests in the Tokachi, 52 including a brooding pair in the Kushiro, 38 in the Nemuro, and none in the Abashiri Districts. The distribution pattern of these 98 nests was basically similar to those found in previous years, but some new nest sites were recorded and by contrast some previous known sites were found to have been destroyed by land development for agriculture. The shortest distance between 2 nests was about 400m and the average shortest one of all nests was 3, 101m (n=97). Only 233 individuals, just 56% of the wintering population, were observed from the air. Some of the cranes of Hokkaido are assumed to migrate to the Kurile Islands. It is clear that not one but a number of surveys is necessary to reveal the true distribution of this species' breeding grounds, with international exchange of information between the USSR and Japan.

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