常盤松御用邸内緑地の鳥類生息地としての評価
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概要
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We conducted a survey for one year to evaluate the bird population on the Tokiwamatsu Imperial Villa which is located in the heart of Tokyo. We assessed the number of species and each species population, the greened area, the number of surrounding greened areas, the distance from these greened areas and also surveyed the degree of diversity of the bird species. We compared these results with those of Shinjuku Gyoen National Garden and the Imperial Palace Tokyo. The line census method was performed 12 times. There were 24 bird species with a total of 605 birds. Also a fixed census was performed the same times and another 5 bird species were recorded. According to this census, the total number of bird species recorded on the Tokiwamatsu Imperial Villa bounded 47, though it was not used for the analysis. The most number of bird species (13) were recorded during the winter (December) and the least number (7) was recorded during the breeding season (August). The most number of birds (76) was recorded in October and the least was in August (25). Five of the most common birds in the city had the highest population. The population of each species was: Brown-eared Bulbul Hypsipetes amaurotis (124), Tree Sparrow Passer montanus (116), Great TitParus major (74). Although we could not find a large difference, compared with 2 other greened areas, the Tokiwamatsu Imperial Villa was the smallest in size. These greens and that of the Tokiwamatsu Imperial Villa are both smaller than the surrounding greens. When comparing the average distances between these greened areas, there was no significant difference. However, the Tokiwamatsu Imperial Villa is the furthest. The largest population of birds at one time was recorded during the winter (January 3) (34) and the last were during the breeding season (June 2) (1). Even though the Tokiwamatsu Imperial Villa in the heart of the city is small, it has many bird species and the population of these species is high. This is a very unique greened area. It appears that Tokiwamatsu Imperial Villa, in the heart of the city, is a very important area for wintering migrants and resident birds. Also from the census data it appears that this greened area is a staging area for migrating birds.
- 国立科学博物館の論文
- 2005-03-25
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