自然教育園の鳥類群集について

概要

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The results of monthly line transect bird censuses made during April, 1960 to March, 1961 (S.Takano) and August, 1964 to July, 1965 (S.Chiba) in the National Park for Nature Study, south-east of Tokyo, a compared. The census was made along a fixed route of 1.8 km. Usually from 9.00-10.00 a.m. 65 and 56 species of birds were recorded in the years 1960 and 1964 respectively and with some additions in 1964,the total increased to 73 species. The relative abundance of species in years 1960 and 1964 was compared with occurrence rate, dominance valu and relateve density per hectare and kilometre (Table 1). In 1964,the study area was divided into 6 habitat types, as shown in Fig.1. The seasonal change in the relative density of the main species in each area are in Table 2. During September 1963 and April1964,over 150 Mandarin Duck, Aix galericulata and Teal, Anas crecca crecca, gathered on the central pond (area II), where they returned at about 6.00 a.m. from their outside feeding area. The Castanopsis wood (area IV) formed a joint roosting site for about 250 Jungle Crow, Corvus levaillantii japonensis and 80 Black-eared Kite, Milvus migrans lineatus. Areal dominance was in general the higherst at area III.
国立科学博物館の論文
1969-03-25