Morphometry of auricular feathers of barn owls (Tyto alba).

U R Koch, H Wagner
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引用次数: 16

Abstract

In all owl species, the facial plumage forms a parabolic dish, the facial ruff, which is most conspicuous in the the barn owl (Tyto alba). The center of the ruff is formed by auricular feathers. Such feathers are also found on the preaural flaps which cover the ear openings, and in the region of the beak. In this study, we compare the different types of auricular feathers of the barn owl with contour feathers from the neck. Auricular feathers are characterised by an open vane structure and fewer barbs as compared to contour feathers. Auricular feathers also have fewer distal and proximal barbules than contour feathers. The open vane of the auricular feather results from an acute angle between the barb and the basis of the barbules, and from the extension of the pennula parallel to the barbs. These reductions are differently expressed in the three different types of auricular feathers investigated here and correspond with their function (protecting the ruff from dust).

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仓鸮(Tyto alba)耳羽的形态测定。
在所有种类的猫头鹰中,面部羽毛形成一个抛物线状的碟状,即面部褶皱,这在仓鸮(Tyto alba)中最为明显。颈圈的中心是由耳羽形成的。这种羽毛也见于覆盖耳口的前翅和喙的区域。在这项研究中,我们比较了仓鸮不同类型的耳廓羽毛和颈部轮廓羽毛。耳状羽毛的特点是一个开放的叶片结构和较少的倒刺相比,轮廓羽毛。耳状羽毛也有较少的远端和近端小管比轮廓羽毛。耳羽的开翅片是由倒刺与小枝基部之间的锐角和平行于倒刺的花冠的延伸形成的。这些减少在这里研究的三种不同类型的耳廓羽毛中有不同的表达,并与它们的功能(保护颈缘免受灰尘)相对应。
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