Предполагаемый гибрид берингийской жёлтой и желтоголовой трясогузок на Тазовском полуострове (Ямало-Ненецкий автономный округ) : An assumed hybrid between Eastern Yellow Wagtail and Citrine Wagtail on the Taz Peninsula (the Yamal-Nenets autonomous district)
The message reports a sighting of an unusually coloured wagtail during ornithological observations on the Taz Peninsula. It was initially recorded as a female Eastern Yellow Wagtail Motacilla tschutschensis J. F. Gmelin, 1789. However, during a thorough investigation of the bird’s photo some non-cha...
| Main Authors: | , |
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| Format: | Report |
| Language: | unknown |
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Фауна Урала и Сибири
2018
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| Online Access: | https://dx.doi.org/10.24411/2411-0051-2018-10214 https://cyberleninka.ru/article/n/predpolagaemyy-gibrid-beringiyskoy-zhyoltoy-i-zheltogolovoy-tryasoguzok-na-tazovskom-poluostrove-yamalo-nenetskiy-avtonomnyy-okrug/pdf |
| Summary: | The message reports a sighting of an unusually coloured wagtail during ornithological observations on the Taz Peninsula. It was initially recorded as a female Eastern Yellow Wagtail Motacilla tschutschensis J. F. Gmelin, 1789. However, during a thorough investigation of the bird’s photo some non-characteristic colour features became apparent. In particular, that bird had a very wide white supercilium with yellow spots, a gray mantle and a wide white border on the secondary coverts. These features are characteristic of Citrine Wagtail M. citreola Pallas, 1776. In addition, individual pale feathers were seen on the ear coverts and the crown. At the same time, such colouring features as the greenish rump and back, almost black crown, loral stripe and ear coverts are specific signs of Eastern Yellow Wagtail. The pale supercilium has an uneven (“torn”) upper border, and the white superciliums almost join on the forehead. The pale feathers of the superciliums slightly bend around the ear coverts from behind. This colouring looks like a transition to the head colouring of female and young Citrine Wagtails in which pale feathers fully separate the dark feathers of the ear coverts from the dark neck plumage. The described combination of the bird’s features indicates the high probability of its hybrid origin. : The message reports a sighting of an unusually coloured wagtail during ornithological observations on the Taz Peninsula. It was initially recorded as a female Eastern Yellow Wagtail Motacilla tschutschensis J. F. Gmelin, 1789. However, during a thorough investigation of the bird’s photo some non-characteristic colour features became apparent. In particular, that bird had a very wide white supercilium with yellow spots, a gray mantle and a wide white border on the secondary coverts. These features are characteristic of Citrine Wagtail M. citreola Pallas, 1776. In addition, individual pale feathers were seen on the ear coverts and the crown. At the same time, such colouring features as the greenish rump and back, almost black crown, loral stripe and ear coverts are specific signs of Eastern Yellow Wagtail. The pale supercilium has an uneven (“torn”) upper border, and the white superciliums almost join on the forehead. The pale feathers of the superciliums slightly bend around the ear coverts from behind. This colouring looks like a transition to the head colouring of female and young Citrine Wagtails in which pale feathers fully separate the dark feathers of the ear coverts from the dark neck plumage. The described combination of the bird’s features indicates the high probability of its hybrid origin. |
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