農村地帯に於けるスズメ群の生態
書誌事項
- タイトル別名
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- Ecological study of the Tree Sparrow <i>Passer montanus</i>
- 1. Age and sex identification
- 第一報野外個体群の年令及び性の識別について
説明
In this first report the following result on age & sex identification is described. 1. In April to July young are identified from adult birds by bill colour & paler black throat band. 2. In August & September, the base of the bill of adults becomes pale & indistinguishable from that of young birds. The moulting of throat band also makes the age identification difficult. 3. Those birds which have finished the first moult are to be separated as young birds from the 'Juveniles'. 4. In October to next March bill colour can be again an age criterion. 5. Sex identification was impossible other than gonad examination (measurements given).
収録刊行物
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- 鳥
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鳥 17 (79-80), 163-171, 1962
日本鳥学会
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詳細情報 詳細情報について
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- CRID
- 1390001205146240000
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- NII論文ID
- 130003605618
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- ISSN
- 18819702
- 00409480
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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
