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首页> 外文期刊>Bulletin of the British Ornithologists' Club >A new subspecies of Gurney's Hawk Buteo poecilochrous
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A new subspecies of Gurney's Hawk Buteo poecilochrous

机译:葛尼鹰But的新亚种

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A new subspecies of Gurney's Hawk Buteo poecilochrous is recognised for populations of the species from northern Peru and western Bolivia to northwest Argentina and northern Chile. Specimen analysis reveals that they differ in size and plumage from northernmost populations, in south Colombia to south Ecuador. The new subspecies is slightly smaller in body measurements and in definitive plumage has the grey-feathered areas darker and more slate-coloured than the nominate subspecies. Furthermore, pale- and dark-morph females possess a more extensive dorsal patch; the pale morph has white central underparts and finely barred or vermiculated sides, whilst in juveniles, in general, these areas are warm brown with rusty or cinnamon markings. In the nominate form, by contrast, the underparts are usually darker brown with creamy or whitish markings.
机译:格尼(Gurney)的鹰But(Hawk Buteo poecilochrous)的一个新亚种被认为是从秘鲁北部和玻利维亚西部到阿根廷西北部和智利北部的该物种的种群。样本分析显示,它们的大小和羽毛与最南端的种群(哥伦比亚南部到厄瓜多尔南部)不同。新的亚种在体形上略小,在确定的羽毛中,灰色羽毛区域比提名的亚种更暗,板岩颜色更深。此外,苍白和深色形态的雌性背侧斑块更为广泛。浅色变体的中央下部为白色,侧面有细条纹或or条,而在青少年中,这些区域通常为温暖的棕色,带有生锈或肉桂的痕迹。相比之下,在提名形式中,底部通常是深棕色,带有乳白色或带白色的标记。

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