HOME

TheInfoList



OR:

Steller's eider (''Polysticta stelleri'') is a migrating Arctic diving duck that breeds along the coastlines of eastern Russia and Alaska. It is the rarest, smallest, and fastest flying of the eider species. Due to the extensive contraction of its breeding range, the Alaska-breeding population of Steller's eider was listed as vulnerable in 1997 by the International Union for the Conservation of Nature (
IUCN The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the status ...
). The species is protected in Russia and the U.S. and is the subject of an ongoing recovery plan by the
European Union The European Union (EU) is a supranational union, supranational political union, political and economic union of Member state of the European Union, member states that are Geography of the European Union, located primarily in Europe. The u ...
and U.S. Fish and Wildlife Service.


Taxonomy

Steller's eider was formally described and illustrated in 1769 by the German naturalist
Peter Simon Pallas Peter Simon Pallas Fellow of the Royal Society, FRS FRSE (22 September 1741 – 8 September 1811) was a Prussia, Prussian zoologist, botanist, Ethnography, ethnographer, Exploration, explorer, Geography, geographer, Geology, geologist, Natura ...
from a specimen collected on the
Kamchatka Peninsula The Kamchatka Peninsula (, ) is a peninsula in the Russian Far East, with an area of about . The Pacific Ocean and the Sea of Okhotsk make up the peninsula's eastern and western coastlines, respectively. Immediately offshore along the Pacific ...
in Eastern Russia. He coined the
binomial name In taxonomy, binomial nomenclature ("two-term naming system"), also called binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, both of which use Latin grammatical forms, altho ...
''Anas stelleri''; the specific epithet was chosen to honour the German naturalist and explorer Georg Wilhelm Steller. Steller's eider is now the only species placed in the genus ''Polysticta'' that was introduced in 1836 by the English naturalist Thomas Eyton. The species is
monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unisp ...
: no
subspecies In Taxonomy (biology), biological classification, subspecies (: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (Morphology (biology), morpholog ...
are recognised. The genus name is from
Ancient Greek Ancient Greek (, ; ) includes the forms of the Greek language used in ancient Greece and the classical antiquity, ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Greek ...
''polustiktos'' meaning "much spotted" (from ''polus'' "many" and ''stiktos'' "spotted"). Despite its name, it is only distantly related to all other extant
eider The eiders () are large seaducks in the genus ''Somateria''. The three extant species all breed in the cooler latitudes of the Northern Hemisphere. The down feathers of eider ducks and some other ducks and geese are used to fill pillows and qu ...
species, which are part of the ''Somateria'' genus. Steller's eider was separated from other eider species into its own genus in 1945 due to behavioral and anatomical differences. Accordingly, Steller's eider may provide a taxonomic link between the eider species in the ''Somateria'' genus and the other sea ducks. It is most closely related to the
extinct Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and ...
Labrador duck The Labrador duck (''Camptorhynchus labradorius'') is an extinct North American duck species. It has the distinction of being the first known endemic North American bird species to become extinct after the Columbian Exchange, with the last report ...
.


Description

Steller’s eider is the smallest of four eider species, with both females and males weighing 800 grams on average (1.8 pounds). They have a compact body with a relatively large head, long tail, and a long, thick bill. The males assume their breeding
plumage Plumage () is a layer of feathers that covers a bird and the pattern, colour, and arrangement of those feathers. The pattern and colours of plumage differ between species and subspecies and may vary with age classes. Within species, there can b ...
from early winter to midsummer with a black cap, chin, throat, eye-ring, and rump, with a white head and shoulders, light-green patches behind the head and in front of the eye, cinnamon breast and shoulders marked with a prominent black spot. The wings appear to be striped white, with an iridescent bluish-purple background colour and white border. They have palmate feet (3 fully webbed toes) which are a dark bluish-gray, the same color as the legs. In mid-summer to fall, males assume their non-breeding plumage which is primarily dark brown with a white-bordered bluish speculum (secondary feathers) on their wing. Females are a dark to cinnamon brown with a pale-white eye-ring, similar to the lighter brown juveniles. Females also have iridescent bluish-purple speculums with a white border running the entire length of the secondaries.


Habitat and distribution

During the winter, Steller’s eiders occupy coastal bays and lagoons that offer suitable forage while occasionally feeding in deeper waters that remain adequately sheltered. They nest in marshy
tundra In physical geography, a tundra () is a type of biome where tree growth is hindered by frigid temperatures and short growing seasons. There are three regions and associated types of tundra: #Arctic, Arctic, Alpine tundra, Alpine, and #Antarctic ...
along the coast, in areas dominated by water sedge and pendant grass. Within the marshy tundra, they designate specific areas to build their nest, preferring elevated surfaces covered by shallow vegetation such as mosses and grasses. Their molting habitat consists of relatively shallow coastal lagoons that offer viable eelgrass and tidal flats for foraging and beaches and sandbars to rest while they remain flightless.


Population distributions

There are three recognized breeding populations of Steller’s eiders, one in Alaska and two in Arctic Russia. * The Russian-Atlantic population makes its breeding ground west of the Khatanga River in western Siberia and winters in the Barents and Baltic seas. * The Russian-Pacific population nests on the east side of the Khatanga River and spends its winters in the southern Bering Sea and northern Pacific Ocean. * The Alaska-breeding population nests on the Arctic Coastal Plain and in exceptionally small numbers in the Yukon-Kuskokwim Delta, and winters in the southern Bering Sea and northern Pacific ocean. Less than 1% of the world’s Steller’s eiders nest in Alaska. Some non-breeding populations will also spend their summers in northern Norway, on the east coast of Russia and adjacent waters, and south-west Alaska.


Behaviour and ecology


Diet

Steller's eiders forage primarily near the shore by employing various techniques such as briefly diving and swimming underwater (to a maximum depth of 9m), wading and dabbling. They feed by surface techniques more than other sea ducks and prefer relatively small prey. Studies have shown that Steller's eiders are specialists in catching highly mobile prey but may limit their diet to
crustacean Crustaceans (from Latin meaning: "those with shells" or "crusted ones") are invertebrate animals that constitute one group of arthropods that are traditionally a part of the subphylum Crustacea (), a large, diverse group of mainly aquatic arthrop ...
s even when higher energy sources, such as
capelin The capelin or caplin (''Mallotus villosus'') is a small forage fish of the smelt family found in the North Atlantic, North Pacific and Arctic oceans. In summer, it grazes on dense swarms of plankton at the edge of the ice shelf. Larger capel ...
, become available. This discrepancy in food preferences may be due to their inability to exploit deeper habitats. Steller's eiders also feed on
mollusks Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The num ...
,
echinoderm An echinoderm () is any animal of the phylum Echinodermata (), which includes starfish, brittle stars, sea urchins, sand dollars and sea cucumbers, as well as the sessile sea lilies or "stone lilies". While bilaterally symmetrical as ...
s, polychaete worms, and
mussel Mussel () is the common name used for members of several families of bivalve molluscs, from saltwater and Freshwater bivalve, freshwater habitats. These groups have in common a shell whose outline is elongated and asymmetrical compared with other ...
s during the winter. While in the tundra during the summer months, they feed on aquatic insects and plant material such as crowberries and pondweeds.


Reproduction

According to banding studies, Steller's eiders can live up to 21 years and four months and reach sexual maturity at two years. Males engage in leks on the wintering and breeding grounds, where groups of males attempt to win over an individual female with elaborate displays. Males court females in silence by displaying a consistent sequence of side-to-side head-shaking while swimming towards and away from their potential female partner. Steller's eiders tend to form breeding pairs during late-winter to early-spring instead of the fall like most waterfowl. Breeding pairs arrive at their nesting sites as early as the beginning of June. Females establish their nests in marshy tundra close to permanent open water that has additional access to small ponds. They specifically select mounds or ridges dominated by mosses, lichens, and grasses. Their nest is shallow, lined with grasses, moss, lichens, and down feathers plucked from the female's breast, who builds the nest without help from the male. Females usually lay 1–8 olive to brownish-orange eggs per breeding cycle. She then incubates the eggs alone for about 25 days. The young are
precocial Precocial species in birds and mammals are those in which the young are relatively mature and mobile from the moment of birth or hatching. They are normally nidifugous, meaning that they leave the nest shortly after birth or hatching. Altricial ...
and hatch between late June and late July with their eyes open and sporting downy feathers. However, predators consume the majority of eggs before they are hatched. The young go to the water shortly after hatching and immediately feed themselves, without relying on their mother for food. Regardless of their feeding independence, females will stay within 700m of their nest for up to 35 days post-hatch, while the young begin flying approximately 40 days after hatching. It is not uncommon for one female to assume care of two or more sets of young from a different mother.


Vocalization

Males make a low jumbled growling sound, while females make a discrete qua-haaa sound of a similar tone. Males have also been reported to produce a repetitive crackling sound when females go underwater. Notably, the males
court A court is an institution, often a government entity, with the authority to adjudicate legal disputes between Party (law), parties and Administration of justice, administer justice in Civil law (common law), civil, Criminal law, criminal, an ...
the females in silence. During flight, their feathers produce a mechanical whistling sound.


Molt

After breeding, Steller's eiders gather in high-density flocks to synchronously molt (replace all their feather at the same time) in Arctic lagoons in northwest Asia and along the Alaska peninsula. They remain flightless for about three weeks, but the entire flight-feather molt lasts from July to October. Juveniles molt first, followed by adult males and adult females.


Threats

The decline of Alaska-breeding Steller’s eider population is predominantly unclear. It has been attributed to changes to the Arctic climate, increased predation rates, hunting and consumption of lead shot, and disease. Since their listing, additional threats such as exposure to oil and other contaminants have been identified.


Climate change

Climate change may pose the greatest threat to Steller’s eiders. Primarily, climate change has caused Arctic tundra ponds to disappear, limiting the extent of suitable habitat for the species. Climate change has also been implicated in the collapse of rodent populations, forcing predators to exploit alternative prey such as the eggs and young of Steller's eider.


Lead poisoning

High levels of lead have been reported in Steller’s eiders that nest on the Alaska Arctic Coastal plain and in Spectacled Eiders that occupy the Yukon-Kuskokwim Delta, where Steller’s Eiders continue to nest in highly reduced densities. Further studies have also shown that lead concentration was higher in individuals located close to industrialized regions than non-industrialized regions.


Nest predation

Nest predation by the
Arctic fox The Arctic fox (''Vulpes lagopus''), also known as the white fox, polar fox, or snow fox, is a small species of fox native to the Arctic regions of the Northern Hemisphere and common throughout the Tundra#Arctic tundra, Arctic tundra biome. I ...
, pomarine jaeger,
snowy owl The snowy owl (''Bubo scandiacus''), also known as the polar owl, the white owl and the Arctic owl, is a large, white owl of the true owl family. Snowy owls are native to the Arctic regions of both North America and the Palearctic, breeding mo ...
, and
common raven The common raven or northern raven (''Corvus corax'') is a large all-black passerine bird. It is the most widely distributed of all Corvidae, corvids, found across the Northern Hemisphere. There are 11 accepted subspecies with little variatio ...
pose the greatest threat to Steller’s eider's nesting success rate. Studies have shown that Steller’s eider reproduce most successfully when lemmings are abundant, most likely resulting from predators transitioning between prey during years of lemming decline.


Natural resource exploitation

The exploitation of natural resources such as oil and gas contributes to Steller’s eider habitat loss. Regional exploitation projects have increased the risk of spill contamination. At the same time, an increase in human presence and infrastructure have contributed to the demise of suitable habitats.


Disease

Steller’s eiders transport the
Avian Influenza Avian influenza, also known as avian flu or bird flu, is a disease caused by the influenza A virus, which primarily affects birds but can sometimes affect mammals including humans. Wild aquatic birds are the primary host of the influenza A viru ...
virus between Eurasia and North America during their migrations. Many recent studies have reported prominent infection rates amongst Steller’s eiders in Alaska, ranging from 0.2% to 5%. It has been suggested that 80% of Steller’s eiders in Alaska are carriers of avian influenza
antibodies An antibody (Ab) or immunoglobulin (Ig) is a large, Y-shaped protein belonging to the immunoglobulin superfamily which is used by the immune system to identify and neutralize antigens such as bacteria and viruses, including those that caus ...
. ''E. coli'' has also been reported in Alaska-breeding Steller’s eiders and is thought to be linked to wastewater from local human communities and industrialization.


Recovery plan

Two-recovery plans have been implemented to restore healthy populations of Steller’s eiders. 
The European Union action plan
published in 2000 and The U.S. Fish and Wildlife Service action plan, originally published in 2002.


U.S. Fish and Wildlife Service Action Plan

The
Recovery Plan for the Alaska-breeding population of Steller’s eider (Polysticta stelleri)
was last revised by the U.S. Fish and Wildlife Service in September 2020. The primary focus of this plan is to ensure a viable breeding population of Steller’s eider in northern Alaska, rather than aiming for two subpopulations in northern and western Alaska. The plan aims to: * Increase the abundance of Steller’s eiders * Ensure adequate population distribution throughout the Utqiaġvik Triangle and Arctic Coastal Plain survey areas * Increase the number of Alaska-breeding Steller’s eiders The recovery plan is primarily limited by uncertainty about the Alaska-breeding Steller’s eider’s ecology and population dynamics. Thus, the action plan coincides with an effort to conduct research and enhance knowledge of the species. The U.S. Fish and Wildlife Service predicts that if the plan is adequately funded and properly implemented, the recovery criteria could be met by 2050. The total cost is estimated at $15,675,000.


Critical habitat designation

In 2001 the U.S. Fish and Wildlife Service designated five critical breeding habitats on the Yukon-Kuskokwim Delta and four marine water units along the coast of southwest Alaska that are critical for molting, feeding, and wintering. The entire designation includes approximately 2,800 square miles and 850 miles of coastline.


Conservation status

In 2016, the global population of Steller’s eider was estimated at 110,000-125,000 individuals and classified as vulnerable by the International Union for the Conservation of Nature (
IUCN The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the status ...
). In 1992, the U.S. Fish and Wildlife Service reviewed the status of Steller’s eider and concluded that listing the species as endangered was warranted, but precluded by higher species listing priorities. One year later, in 1993, they reconsidered Steller’s eider’s status and supported the listing of the Alaska-breeding population, but did not include the Russian-breeding populations. Finally, the Alaska-breeding population was listed as threatened in 1997. The primary reason for listing was the near disappearance of the Yukon-Kuskokwim Delta population, contracting the Alaskan nesting sites to the Arctic Coastal Plain and increasing the population’s risk of extirpation.`


Cultural significance

Steller’s eiders were once legally harvested by waterfowl hunters in the U.S., but all legal hunting ended in 1991. Egging and subsistence hunting still occurs in Alaska, but is uncommon. The degree of subsistence hunting in Russia and its effect on the population is poorly documented.  


References


External links

* * * * * * * {{Taxonbar, from=Q210954 Steller's eider Birds of the Arctic Birds of North Asia Native birds of Alaska Steller's eider Steller's eider Holarctic birds