屋久島における森林棲鳥類の垂直分布 : II.非繁殖期

概要

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A research on the altitudinal distribution of forest birds was conducted on the Yakushima Island, south-western Japan, in winter, 1983. Three types of the assemblages of dominant bird species were recognized in respective plant formations from the coastal area to the mountain top : Hypsipetes amaurotis, Zosterops japonica and Parus varius in an evergreen broad-leaved forest (40-900 m) and in a Cryptomeria forest with evergreen broad-leaved trees (900-1200 m), Z. japonica, P. ater, Troglodytes troglodytes and P. varius in a Cryptomeria forest with deciduous trees (1200-1555 m), and Z. japonica, Turdus naumani and Emberiza cioides in a mosaic of a scrub of Pseudosasa and Cryptomeria forest (1555 m-1886 m). Overall, of the thirty-two species recorded, twenty-two were residents and ten were winter visitors. Of the seven dominant residents, three species shifted downward, one shifted upward, and three did not shift from their breeding sites. Winter visitors were characterized by many seed or fruit eaters, or ground-foraging insectivores and no canopy-foraging insectivores, which is in contrast to summer visitors. Winter visitors mainly invaded the Cryptomeria forest with deciduous trees or shrub in a forest edge, the habitats being liable to a great seasonal change.
日本生態学会の論文
1992-08-10