自然教育園におけるシジュウカラの繁殖個体数について(1976年度)

概要

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1. We investigated how many Great Tits live in breeding season at the National Park for Nature Study in 1976. The result of the investigation was compared with the study of SAKURAI et al. (1972). 2. There seems to be about 40 males. This number is nearly the same in 1961. 3. The number of the birds that have their territories in this park may tend to increase. This tendency is remarkable at the west side of Hyotan-ike pond and Sanshouo-sawa stream. 4. The number of the birds whose territories protrude beyond this park doesn't show a sharp fluctuation except for slight decrease around the new built expressway. But, none of the birds moving beyond the expressway are not always observed. 5. We found that a bird, on the average, has 0.37 ha. Of its territory which is limited in this park. This suggests that density of these birds in this park is high. 6. As nest site, Cornus controvasa, Shiia siebordii, Quercus serrata etc, are used. It seems that the boughs of Cornus are easy to break and to make a hole. 7. This paper also descrives consideration about method of estimating the number of Great Tit in breeding season.
国立科学博物館の論文
1981-03-25