トビの生活史に関する研究 II : 非繁殖期

概要

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1. From Novemler 1962 to January 1965,the life during the non-breeding season of the Black-eared Kite was observed in the Zenkoji basin in the northern part of Nagano Prefecture. 2. The Black-eared Kites in the Zenkoji basin in, winter became separated into 5 roosting flock areas ; they had definite roosting places in each area. The number of birds in each of the roosting flock areas were in proportion to the population of the main cities in that district (Fig. 1,Tables 1,5). 3. A total of 14 roosting places were observed in the northern part of Nagano Prefecture. The vegetation of the roosting places was, almost entirely of the Japanese red pine except for one place which consisted of the Japanese cypress (Table 2,Fig. 1). 4. River-side, slaughter-house, dust-house and sewer were chosen as the assembly places for food-taking, and one or four such places were found in each flock area. There was a strong tendency to flock together especially in the snow season.
日本生態学会の論文
1966-04-01