「鳥類(カラス類を主とした)と人との関わりに見られる都市環境の変化」の研究(平成7年度)

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1. Introduction : The urban environment has been charged remarkable in recent year . The specific species adapted on the urban environment is remained, and the simpllicity of the species composition is recognized there. The crows carried on the present study are typical species as mentioned avove. They have used the remainning small green forest as their roost with large number and have been feeding, resting, and breeding around their roost place. In the day time, they catched the wild small animals or the domestic animals in the activity area of human being, and have dameged to the planted vegetable. Futhermore, they have attacked occasionally to the walking people, especially in breeding season. In order to deal with these problems, we make clear the roost condition, the home range in center of roost , and the circumstances of damage including people. Finally, the idea of the coexistance between the bird and human being in the urban environment has to devise a plan. 2. Objectives of the present study : The objectives of the present study is to make clear relationship between bird life and human activity in the peculiar environment of the big city . Owing bo this objectives, increasing of crow's population in the urban area, analyzing of facter that crows from the big collective, home range, and the daily and seasonal change of behavior and habit crows will make clear in the further study. Furthermore, the actual circumstances of the human activity and the life of crows will be grasped. 3. Result of the study : We investigated the number of crows in their roost of Tokyo and Akita city, 1996. 1) Result in Tokyo as folloes, (1) Institute for Nature Study -------4,570 Crows (23,Febr. 1996) (2) Meiji Shrine --------------------5,470 Crows (9,March, 1996) (3) Ueno Park -----------------------390 Crows (10,March, 1996) (4) Gokoku Temple ------------------2,200 Crows (11,March, 1996) (5) Rikugien ---------------=---------660 Crows (12,March, 1996) We collected coincidently data as concerning of the number of coming back to roost, of its direction, and of the change of the daily activity in relation to the light-intensives. 2) Result in Akita City In order to compare the status of Tokyo with Akita City, investigation of the crows in Akita City were in 1995 and 1996. Crows lived in sorroundings of Akita City roosted into the Black Pine (Pinus zumbergi) forest located at Mukaihama, however they changed the roost into Black Pine forest at Matsumigaoka, Araya, in the late Autumn when the strong north directed wind biew with snow (about 4,000 crows, 27,February, 1996). 3) Otherwise , we have investigated Crow's behaviors with tags and by the radio-telemeter method, in order to make clear the activity area of crows. We got the permitions from the Director General of Cultural Agency (N0.4-1235,11,Dec . 1996), and from the Director General of Environmental Agency.
国立科学博物館の論文
1997-03-25

「鳥類(カラス類を主とした)と人との関わりに見られる都市環境の変化」の研究(平成7年度)

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