Eider
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| Eider | |
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| Name | Eider |
| Genus | Somateria |
| Species | S. mollissima, S. spectabilis, S. fischeri, S. sedentaria |
| Family | Anatidae |
| Order | Anseriformes |
Eider is a common name applied to several large sea ducks in the genus Somateria within the family Anatidae. These northern diving ducks are noted for their dense down used historically in bedding and clothing and for their coastal breeding and wintering distributions across subarctic and temperate shorelines. They have figured in the natural histories compiled by figures such as Carl Linnaeus and in the cultural practices of peoples including the Inuit and coastal communities of Scandinavia.
Taxonomy and species
The genus Somateria sits within the tribe Mergini of the family Anatidae, alongside genera such as Clangula, Melanitta, Bucephala, and Mergus. Four widely recognized species are the common eider (Somateria mollissima), the spectacled eider (Somateria fischeri), the king eider (Somateria spectabilis), and the Swedish or Pacific eider (Somateria fischeri / S. mollissima subspecies distinctions have been debated). Taxonomic treatments have been revised by authorities including the International Ornithologists' Union, the American Ornithological Society, and regional checklists like those of the British Ornithologists' Union. Historical nomenclature traces to works by Mathurin Jacques Brisson and Georges Cuvier; modern molecular studies referencing researchers such as George Sangster and Per Alström have used mitochondrial and nuclear markers to test relationships among eiders and other sea ducks.
Description and identification
Adults are large, heavy-bodied ducks with bulbous heads, sloping foreheads, and stout bills, comparable in size to some Anser species. Male plumages vary: the king eider male displays striking patterns reminiscent of descriptions found in plates by John James Audubon; the common eider male shows contrasting black and white similar to plates by Thomas Bewick; the spectacled eider male bears pale facial markings that have attracted attention in field guides by Roger Tory Peterson and David Sibley. Females are cryptically patterned brown, convergent with female plumages in genera like Somateria's relatives Melanitta and Clangula. Juvenile stages have intermediate plumage noted in longitudinal studies by ornithologists such as Erwin Stresemann. Distinguishing species in the field often requires attention to bill shape, vocalizations recorded in archives like the Macaulay Library, and habitat context such as proximity to colonies documented by conservation organizations like the World Wildlife Fund.
Distribution and habitat
Eiders breed across northern coastal regions of the Palearctic and Nearctic. The common eider nests along coasts of Greenland, Iceland, the Faroe Islands, Norway, Russia, and the northeastern shores of Canada and New England. The king eider ranges across Alaska, Canada, and the Russian Far East, migrating to Arctic and subarctic seas; the spectacled eider nests on coastal tundra of Alaska and Siberia. Typical habitats include rocky islands, sheltered bays, kelp beds, and tundra adjacent to the Arctic Ocean, with wintering sites in productive coastal upwellings such as those off Nova Scotia, Scotland, and the Barents Sea. Studies by marine ecologists at institutions like the Norwegian Polar Institute and the University of Alaska Fairbanks have emphasized affinities for benthic feeding grounds and association with sea-ice dynamics.
Behavior and ecology
Eiders are diving, benthic foragers that feed primarily on mollusks, crustaceans, echinoderms, and marine invertebrates, using bill morphology and gular bracing to extract prey in substrates similar to foraging behaviors documented for genera like Melanitta and Bucephala. Foraging aggregations may form large flocks in winter, a phenomenon chronicled in seabird surveys by organizations such as the Royal Society for the Protection of Birds and the Canadian Wildlife Service. Social behaviors include communal brood-rearing noted in long-term studies by coastal research stations and anti-predator responses to species like Gavia immer (common loon), Uria aalge (common murre), and avian predators including Haliaeetus albicilla and Haliaeetus leucocephalus. Migration routes and timing have been tracked with satellite telemetry projects run by teams at universities like University of Tromsø and agencies such as Environment and Climate Change Canada.
Reproduction and life cycle
Breeding occurs on coastal islands, skerries, and tundra; nests are depression-lined scrapes often insulated with down plucked from the female’s breast, a behavior referenced in ethnographies of Sami and Aleut peoples. Clutch sizes typically range from four to six eggs; incubation is performed primarily by the female over approximately 24–30 days, as documented in nest monitoring by researchers affiliated with BirdLife International and regional natural history societies. Ducklings are precocial, leaving the nest within 24–48 hours and led to feeding areas by the female, with brood amalgamation sometimes resulting in creches described in field studies by ornithologists like Kenn Kaufman. Age at first breeding is usually two to three years, and adult survival rates have been estimated in mark–recapture studies coordinated by ringing schemes such as the European Union for Bird Ringing.
Conservation and human interactions
Populations face threats from oil pollution incidents affecting wintering concentrations, bycatch in gillnets documented by fisheries observers from agencies like the Food and Agriculture Organization, climate-driven changes to sea-ice and benthic prey influenced by research from the Intergovernmental Panel on Climate Change, and historical overharvest for down and meat during periods recorded in the archives of the Hudson's Bay Company. Conservation measures include protected areas designated by entities such as the Ramsar Convention and national agencies like Natural England and Fisheries and Oceans Canada, species action plans promoted by BirdLife International, and regulations on down harvest developed in collaboration with cultural stakeholders including Greenlandic communities. Ongoing monitoring by universities, government agencies, and NGOs continues to inform management responses to shifting distributions and emerging threats.