Past and Present Distribution of Blakiston's Fish Owl (Ketupa blakistoni) in Hokkaido, Japan. Based upon Museum Specimens.

DOI 5 Citations
  • Hayashi Yuko
    Laboratory of Applied Zoology, Faculty of Agriculture, Hokkaido University Chromosome Research Unit, Faculty of Science, Hokkaido University

Bibliographic Information

Other Title
  • 北海道におけるシマフクロウの分布の変遷　　主に標本資料からの推察
  • Based upon Museum Specimens
  • 主に標本資料からの推察

Abstract

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.

Journal

Citations (5)*help

See more

Keywords

Details 詳細情報について

  • CRID
    1390001205038104064
  • NII Article ID
    130003572873
  • DOI
    10.3312/jyio1952.31.45
  • ISSN
    18833659
    00440183
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

Report a problem

Back to top