WINTER ROOSTING FLOCK OF GRAY STARLING (STURNUS CINERACEUS) IN THE ZENKOJI BASIN IN NAGANO PREFECTURE I.

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  • 長野県下の善光寺平におけるムクドリの冬期の就塒地域群(第一報)
  • 長野県下の善光寺平におけるムクドリの冬期の就塒地域群-1-
  • ナガノ ケンカ ノ ゼンコウジ タイラ ニ オケル ムクドリ ノ トウキ ノ シュウジチイキグン 1

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1. There were two local roosting flocks in the Zenkoji basin in winter, that is to say, in the Akaiwa and Sakaki areas. During both the non-snow season from December 23 to 30 1963 and the snow seasson from January 11 to 31,1964,we observed about 43,000-50,000 Gray Starlings in the former area, and about 1,300-220 in the latter. 2. In the Akaiwa local roosting flock, a large flock assembled with a tendency of group formation, but at the marginal parts of this area, only a few assembled to make some smaller winter roosts with the adults remaining at their nesting site. In the Sakaki local roosting flock, the lay of the land is complicate and thus they formed smaller area roosts. But we may say these smaller winter roosts belong to the Ueda local roosting flock. 3. The apple orchards are their important feeding places in winter. Their flight line was along the apple orchards, which were abundant in the northern parts of the Zenkoji basin ; They made their main roost in it. So we may be able to presume some relations between the population density of the Gray Starling and the distribution of the apple orchards.

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