Ainley's Storm-Petrel
Hydrobates cheimomnestes
Rare and poorly known seabird found in the Pacific Ocean well off the coast of Mexico. It breeds in the winter on small islets near Guadalupe Island, located 160 miles from the mainland, and disperses southward during other times of the year. Plumage is dark gray with a notched tail, white rump patch, and pale stripes on the upperwing. The rump patch is variable in extent, and on some birds may be split down the middle by gray feathers. Identification is extremely difficult due to its similarity with other species, especially Townsend’s Storm-Petrel and Leach’s Storm-Petrel. Remains at sea when not breeding; flies erratically and often patters the ocean with its feet.
识别特征
Ainley's storm petrel is a medium-sized species about 18 cm (7.1 in) long, with fairly long wings with blunt points, and a moderately long, forked tail. The general colour is dark sooty-brown but from a distance this appears black; pre-moult adults may look more brownish when the plumage is worn. The rump is white, a U-shaped white patch having a central poorly defined dark area. The beak, legs and feet are black, and the feet do not extend beyond the tail in flight. It is only slightly different from other related species such as the Townsend's storm petrel and Leach's storm petrel
分类信息
This species was first described as a subspecies of Leach's storm petrel (Hydrobates leucorhoa), by the United States marine ornithologist David Ainley. He distinguished it on grounds of physiology, morphology and voice, separating it from Townsend's storm petrel (Hydrobates socorroensis) which breeds on the same islands in the summer whereas Hydrobates cheimomnestes breeds in the winter. The species name cheimomnestes means "winter suitor", in reference to the fact that this bird breeds in the winter. There is still disagreement among authorities as to whether it should be regarded as a separate species. It is recognised as such by Avibase, but not by the International Union for Conservation of Nature. It was formerly defined in the genus Oceanodroma before that genus was synonymized with Hydrobates.
- 学名
- Hydrobates cheimomnestes
- 命名信息
- (Ainley, 1980)
- 目
- Procellariiformes
- 科
- Hydrobatidae
- 属
- Hydrobates
分布与栖息地
Breeding range: PO : winter breeder, is. Negro, Afuera and Gargoyle Rocks, off Guadalupe I. (w of Baja California, nw Mexico). Non-breeding range: to tropical se Pacific near Galápagos.
- 繁殖区
- PO : winter breeder, is. Negro, Afuera and Gargoyle Rocks, off Guadalupe I. (w of Baja California, nw Mexico)
- 非繁殖区
- to tropical se Pacific near Galápagos
- 迁徙
- Complete migrants
行为
Migration pattern: Complete migrants.
保护状况
Population trend: stable.
- 种群趋势
- stable
照片
分布
鸟叫声
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