Morphological Differences of Sex and Age in the Okinawa Rail<i>Gallirallus okinawae</i>

DOI 被引用文献4件
  • Ozaki Kiyoaki
    Division of Avian Conservation, Yamashina Institute for Ornithology

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タイトル別名
  • Morphological differences of sex and age in the Okinawa Rail Gallirallus okinawae

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説明

Morphological measurements of Okinawa Rail Gallirallus okinawae were made to evaluate methods of sex determination. Males were significantly larger (P<0.05) than females for 23 of the 25 features measured. Forward discriminant function analysis identified eight of the most useful measurements as maximum wing, exposed culmen, tarsus, total head, gape, bill height, body weight and third toe length. Further analysis selected total head (TH) and bill height (BH) as the most useful variables to determine sex and produced the discriminant function: 0.467×TH+0.827×BH−53.811, which correctly identified the sex of 100% of the individuals in the data set. Bill and iris color proved useful for determining age, as did the tip shape and color of the primary feathers. Characteristics of juvenile primaries were especially useful, since the birds retain their first year plumage until molting at about one year old. Individual variation also exists, however, requiring comprehensive evaluation of all biometrics and features for some individuals.

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詳細情報 詳細情報について

  • CRID
    1390282680166605952
  • NII論文ID
    130004725559
  • DOI
    10.2326/osj.8.117
  • ISSN
    27595897
    13470558
  • 本文言語コード
    en
  • データソース種別
    • JaLC
    • Crossref
    • CiNii Articles
    • OpenAIRE
  • 抄録ライセンスフラグ
    使用不可

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