書誌事項
- タイトル別名
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- Variance in the Sex Ratio among Pintails Wintering in the Tokyo Area
- トウキョウ キンコウ ニ トライ スル オナガガモ コタイグン ノ セイヒ ノ カタヨリ
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説明
The number of Pintails, Anas acuta, were counted when wintering at eight ponds around Tokyo, Japan. Two ponds were monitored weekly and six ponds were monitored monthly during the 2003-2004 wintering season (from November to February). Every pond was monitored monthly during the 2004-2005 wintering season. We found that: (1) the sex ratio of the wintering ducks varied between the ponds, (2) the sex ratios were generally biased and tended to be robust both within and between seasons, (3) the proportion of males was negatively correlated with the proportion of the ducks on land, and (4) females were observed more frequently on land than males.
収録刊行物
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- 山階鳥類学雑誌
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山階鳥類学雑誌 37 (1), 3-10, 2005
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
- 1390282680199591680
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- NII論文ID
- 130000446283
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- NII書誌ID
- AA11864856
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- ISSN
- 18820999
- 13485032
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- NDL書誌ID
- 7691116
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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
- NDLサーチ
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可
