赤坂御用地の鳥類相(2002年4月-2004年3月)

概要

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The avifauna of the Akasaka Imperial Gardens, Tokyo, was investigated by monthly bird censuses from April 2002 to March 2004. Forty-six species were recorded in the censuses. We newly recorded three species: Water Pipit Anthus spinoletta, Red-breasted Flycatcher Ficedula parva, and Brambling Fringilla montifringilla. Both number of species and that of individuals increased during winter and decreased during breeding seasons. The species diversity also showed similar seasonal changes. These results suggest that the Akasaka Imperial Gardens is an important wintering habitat for birds. In comparison with census data in other large gardens in Tokyo, the avifauna of the Gardens was not different from that of the Institute for Nature Study, but had lower species diversity than that of the Imperial Palace, Tokyo, possibly because the Palace has larger area including large ponds. Using census data between 1986 and 2001 in a previous study, we did not find correlation between number of species and year. Twelve species that had been recorded from 1965 to 1967 were not found in the recent censuses. This may be caused by the environmental change in large scale, i.e. the development of Tokyo, and the habitat destruction in the wintering area for summer visitors.
国立科学博物館の論文
2005-03-25