Polysticta
Welcome to MedLibrary.org. For best results, we recommend beginning with the navigation links at the top of the page, which can guide you through our collection of over 14,000 medication labels and package inserts. For additional information on other topics which are not covered by our database of medications, just enter your topic in the search box below:
| Steller's Eider | |
|---|---|
 |
|
| A drake | |
| Conservation status | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Anseriformes |
| Family: | Anatidae |
| Subfamily: | Merginae |
| Genus: | Polysticta Eyton, 1836 |
| Species: | P. stelleri |
| Binomial name | |
| Polysticta stelleri (Pallas, 1769) |
|
The Steller's Eider (Polysticta stelleri) is a smallish sea duck that breeds along the Arctic coasts of eastern Siberia and Alaska. The lined nest is built on tundra close to the sea, and 6-10 eggs are laid.
It winters somewhat farther south in the Bering Sea, northern Scandinavia and the Baltic Sea. It can form large flocks, up to 200,000 birds on suitable coastal waters. It is scarce south of its wintering range.
This species dives for crustaceans and molluscs, with mussels being a favoured food.
This species is the smallest eider at 45 cm long.[2] The male is unmistakable with its black upperparts and neck collar, white head and yellowish underparts. The drake's call is a deep crooning, although it is relatively quiet compared to the Somateria eiders.
The female is a dark brown bird, smaller with a more typically duck-shaped head and body than other eider species. She also has a repertoire of grunts and whistles.
This bird is named after the German naturalist Georg Steller.
The Steller's Eider is thought to have hybridised with the Common Eider on at least two occasions in the wild. A drake showing characters of both species was present at Cuxhaven, Niedersachen, Germany on 17 November 1993.[3] Another drake was seen in Vadso harbour, Varanger, Norway on 7 April 1995; a photograph of this bird was published accompanying Forsman (1995).[4]
Conservation
The Steller's Eider is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies. There is an active recovery plan in Alaska.[5]
References
- ^ BirdLife International (2012). "Polysticta stelleri". IUCN Red List of Threatened Species. Version 2012.1. International Union for Conservation of Nature. Retrieved 16 July 2012.
- ^ The Birds of North America Online. Cornell Lab of Ornithology. Ithaca
- ^ Anon (1995) Hybrid coincidence Birding World 8(5):200
- ^ Forsman, Dick (1995) A presumed hybrid Steller's Eider x Common Eider in Norway Birding World' 8(4):138
- ^ Minerals Management Service, Alaska (2007). "Foraging Ecology of Common Ravens (Corvus corax) on Alaska’s Coastal Plain (AK-93-48-51)". Minerals Management Service. Retrieved 2007-05-24.
External links
- BirdLife Species Factsheet.
- ARKive Photographs, videos.
