北海道におけるヤマガラの繁殖期の分布
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概要
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The Varied Tit Parus varius was censused along one to three 2-km transects (a total of 990) situated in 879 quadrats (4.5×5 km) in Hokkaido from late April to late July, 1976–2011. Based on census results and records from the literature, Varied Tits occurred in 19% of quadrats at the southern and central parts, in 4% of the eastern part and in 5% of the northern parts, respectively. They were observed mainly in mixed and deciduous broad-leaved forests with occurrence rates (No. of transects of occurrence/No. of transects censused) of 5% and 11% respectively, and at altitudes less than 460 m.
- Yamashina Institute for Ornitologyの論文
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