沖縄島に生息するウグイスＣｅｔｔｉａ　ｄｉｐｈｏｎｅの二型について　　多変量解析によるリュウキュウウグイスとダイトウウグイスの再評価

• 梶田 学

  京都大学大学院理学部理学研究科動物学教室

• 真野 徹

  環境科学株式会社

• 佐藤 文男

  山階鳥類研究所標識研究室

書誌事項

タイトル別名

• Two Forms of Bush Warbler Cettia diphone Occur on Okinawajima Island: Re-evaluation of C.d. riukiuensis and C.d. restricta by Multivariate Analyses.
• Re-evaluation of <i>C. d. riukiuensis</i> and <i>C. d. restricta</i> by Multivariate Analyses
• 多変量解析によるリュウキュウウグイスとダイトウウグイスの再評価

抄録

It has long been believed that the Ryukyu Bush Warbler Cettia diphone riukiuensis (Kuroda, 1925) is resident and the only subspecies distributed in Ryukyu Archipelago, Japan. However, we found that Bush Warblers on Okinawajima occur in two distinct plumage forms. One form, the brown form, is characterized by having deep rusty brown upper parts, while the other, gray form, has grayish olive upper parts. Our investigations, using mist-nets to trap birds clarified that the brown form is resident and that the gray form winters on the Island. Univariate analysis of 13 measurements taken of the birds, revealed significant morphological differences of the two forms. Likewise, multivariate analysis differentiated the brown form from the gray form. The type series of C. d. riukiuensis (14 specimens, already lost) were identified as being of the gray form by using a linear discriminant function obtained from 4 measurements from the two forms. The measurements and plumage characteristics in the original description of C. d. riukiuensis conform with the gray form. These results indicate that the gray form should be ascribed to C. d. riukiuensis. It has become clear that C. d. riukiuensis is a wintering bird, not a resident on Okinawajima. The measurements and plumage characteristics of the brown form conform with the original description of the Borodino Bush Warbler C. d. restricta (Kuroda, 1923). The type series of C. d. restricta (2 specimens, already lost) were identified as being the same as the brown form by using linear discriminant function. These results indicate that the brown form should be attributed to C. d. restricta. C. d. restricta has been regarded as an extinct, endemic subspecies that occurred only on Minami-Daitojima Island. Our results suggest, however, that C. d. restricta is not extinct and that it inhabits on Okinawajima.

収録刊行物

• 山階鳥類研究所研究報告

  山階鳥類研究所研究報告 33 (2), 148-167, 2002

  公益財団法人 山階鳥類研究所

キーワード

• ウグイス
• <i>Cettia diphone</i>
• 沖縄島
• 形態
• 分類
• 多変量解析

詳細情報

• CRID: 1390001205038084608
• NII論文ID: 130003572904
• DOI: 10.3312/jyio1952.33.148
• ISSN: 18833659
• ISSN: 00440183
• ISSN: http://id.crossref.org/issn/00440183
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可