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- 早矢仕 有子
- 北海道大学農学部応用動物学教室 北海道大学理学部附属動物染色体研究施設
書誌事項
- タイトル別名
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- Past and Present Distribution of Blakiston's Fish Owl (Ketupa blakistoni) in Hokkaido, Japan. Based upon Museum Specimens.
- Based upon Museum Specimens
- 主に標本資料からの推察
抄録
The change in distribution of Blakiston's Fish Owls Ketupa blakistoni was investigated by using primarily obtained specimens from museums and supplemented with information from the literature and Ainu legends. Sixtynine of 104 specimens found in Japan (including discarded) contain some information about their collection sites. Here I present historical evidence for the occurrence of fish owls in even the southern-most part of Hokkaido in the 19th century. However, habitat loss caused a reduction of population size and the owls disappeared from the southern and northern parts of Hokkaido in 1950's and from the Ishikari plain in the early 1980's. Their distribution in Hokkaido is now restricted to the eastern part of the island. Between 1954 and 1995 the causes of death were known for 31 fish owls. All deaths were caused by humans. Drowning in the fish-stocked ponds was the main cause (36.8%) followed by traffic accidents (21.1%) and electrocution (13.2%). In order to conserve the owl species, population changes should be monitored continuously and their habitats should be preserved and restored.
収録刊行物
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- 山階鳥類研究所研究報告
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山階鳥類研究所研究報告 31 (1), 45-61, 1999
公益財団法人 山階鳥類研究所
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詳細情報 詳細情報について
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- CRID
- 1390001205038104064
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- NII論文ID
- 130003572873
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- ISSN
- 18833659
- 00440183
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可