Relict Gull
Ichthyaetus relictus
This small black-headed gull breeds on scattered saline lakes throughout central and northern Asia, as far east as Mongolia and northeastern China. However, it is seldom seen on its breeding grounds due to their remoteness. It winters in estuaries, beaches, and mudflats, where adults shed their handsome dark hoods for smudgy “earmuffs.” First winter birds are similar, but have light brown speckling on the wings (solid gray in adults, save for black-and-white tips). Stubbier-billed than Black-headed Gull and generally paler-headed than Saunders's Gull.
识别特征
The gull is 44 to 45 cm long with a stocky, thick body. Non-breeding adults feature uniformly dark-smudged ear-coverts and hind crown, white-tipped wings, prominent, isolated black subterminal markings on outer primaries, and no white leading edge to outer wing. Breeding birds have black hoods (including napes) with grey-brown foreheads, and broad, white, half-moon colouring behind, below, and above their eyes. Their legs are orange and their bills scarlet. The name comes from its status as a relict species.
分类信息
Genus: Ichthyaetus; Family: Laridae; Order: Charadriiformes.
- 学名
- Ichthyaetus relictus
- 命名信息
- (Lönnberg, 1931)
- 目
- Charadriiformes
- 科
- Laridae
- 属
- Ichthyaetus
分布与栖息地
The gull breeds in several locations in Mongolia (e.g., Galuut Lake, Khukh Lake, and Chukh Lake), two in Kazakhstan, one in Russia, and one in China (Lake Hongjiannao). Small numbers appear to migrate to South Korea during the nonbreeding period. There is additional evidence that larger numbers may migrate to eastern China as well, but this is not verified.<p>The gulls breed starting in early June and going through early August in colonies on islands in saltwater lakes. These sites are fragile. Nesting does not occur when lakes dry up or when water levels are too high. When islands become too small or overgrown with vegetation or so large that they join at the shore, the birds do not nest either. During non-breeding periods, the birds can be found on estuarine mud and sandflats.
- 繁殖区
- PAL : lakes of ne Kazakhstan, Mongolia, Inner Mongolia and Shaanxi (nc China) and Transbaikalia (se Russia)
- 非繁殖区
- rare to coasts of Korean Pen., Bohai Bay, Yellow Sea and East China Sea
- 迁徙
- Complete migrants
行为
Migration pattern: Complete migrants.
保护状况
Population trend: declining.
- 种群趋势
- declining
照片
分布
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