Surf Scoter
Encyclopedia
The Surf Scoter is a large sea duck
, which breeds in Canada
and Alaska
. It is placed in the subgenus Melanitta, along with the Velvet
and White-winged Scoter
s, distinct from the subgenus Oidemia, Black
and Common Scoter
s.
It winters
further south in temperate
zones, on the coasts of the northern USA. Small numbers regularly winter in western Europe
as far south as Great Britain
and Ireland
. Some birds may over-winter on the Great Lakes
. It forms large flocks on suitable coastal waters. These are tightly packed, and the birds tend to take off together.
The lined nest is built on the ground close to the sea, lakes or rivers, in woodland or tundra. 5-9 eggs are laid. An egg may range from 55-79 grams (1.9-2.8 oz) and average 43.9 mm (1.7 inches) in breadth and 62.4 mm (2.5 inches) in length. Occasional (and likely accidental) brood mixing between different females occurs in areas with high densities of nests. Growth is relatively rapid and the incubation period is about 28 to 30 days. The offspring will fledge independently at about 55 days.
The adult female averages about 900 grams (2 lbs.) and 44 cm (17 inches) in length, while the adult male is on average 1050 grams (2.3 lbs.) and 48 cm (19 inches) in length, making this the smallest species of scoter on average. It is characterised by its bulky shape and large bill. The male is all black, except for white patches on the nape and forehead. It has a bulbous red, yellow and white bill. The females are brown bird
s with pale head patches. The wedge-shaped head and lack of white in the wings helps to distinguish female Surf Scoters from female Velvet Scoter
s.
Adult scoters of this species dive for crustacean
s and molluscs, while the ducklings live off any variety of freshwater invertebrate
s.
In November, 2007, an oil spill in San Francisco harbour oiled and killed thousands of birds including many Surf Scoters. About 40 per cent of the birds affected were from this species. Scientists said that while the species is not endangered it has declined 50 to 70 per cent over the past 40 years and this spill could decrease populations since most of the affected birds are healthy adults.
Merginae
The seaducks, Merginae, form a subfamily of the duck, goose and swan family of birds, Anatidae.As the name implies, most but not all, are essentially marine outside the breeding season. Many species have developed specialized salt glands to allow them to tolerate salt water, but these have not yet...
, which breeds in Canada
Canada
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...
and Alaska
Alaska
Alaska is the largest state in the United States by area. It is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait...
. It is placed in the subgenus Melanitta, along with the Velvet
Velvet Scoter
The Velvet Scoter , also called a Velvet Duck or whitewing , is a large sea duck, which breeds over the far north of Europe and Asia west of the Yenisey basin. A small, isolated population nests in eastern Turkey...
and White-winged Scoter
White-winged Scoter
The White-winged Scoter is a large sea duck.-Description:It is characterised by its bulky shape and large bill. This is the largest species of scoter. Females range from 950-1950 grams and 48–56 cm , averaging 1180 grams and 52.3 cm . She is brown with pale head patches...
s, distinct from the subgenus Oidemia, Black
Black Scoter
The Black or American Scoter is a large sea duck, 43 to 49 centimeters in length. Together with the Common Scoter M. nigra, it forms the subgenus Oidemia; the two are sometimes considered conspecific, the Black Scoter then being referred to as M. nigra americana...
and Common Scoter
Common Scoter
The Common Scoter is a large sea duck, 43-54 cm in length, which breeds over the far north of Europe and Asia east to the Olenyok River. The American/E Siberian M. americana is sometimes considered a subspecies of M. nigra.It winters further south in temperate zones, on the coasts of Europe as...
s.
It winters
Bird migration
Bird migration is the regular seasonal journey undertaken by many species of birds. Bird movements include those made in response to changes in food availability, habitat or weather. Sometimes, journeys are not termed "true migration" because they are irregular or in only one direction...
further south in temperate
Temperate
In geography, temperate or tepid latitudes of the globe lie between the tropics and the polar circles. The changes in these regions between summer and winter are generally relatively moderate, rather than extreme hot or cold...
zones, on the coasts of the northern USA. Small numbers regularly winter in western Europe
Europe
Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...
as far south as Great Britain
Great Britain
Great Britain or Britain is an island situated to the northwest of Continental Europe. It is the ninth largest island in the world, and the largest European island, as well as the largest of the British Isles...
and Ireland
Ireland
Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...
. Some birds may over-winter on the Great Lakes
Great Lakes
The Great Lakes are a collection of freshwater lakes located in northeastern North America, on the Canada – United States border. Consisting of Lakes Superior, Michigan, Huron, Erie, and Ontario, they form the largest group of freshwater lakes on Earth by total surface, coming in second by volume...
. It forms large flocks on suitable coastal waters. These are tightly packed, and the birds tend to take off together.
The lined nest is built on the ground close to the sea, lakes or rivers, in woodland or tundra. 5-9 eggs are laid. An egg may range from 55-79 grams (1.9-2.8 oz) and average 43.9 mm (1.7 inches) in breadth and 62.4 mm (2.5 inches) in length. Occasional (and likely accidental) brood mixing between different females occurs in areas with high densities of nests. Growth is relatively rapid and the incubation period is about 28 to 30 days. The offspring will fledge independently at about 55 days.
The adult female averages about 900 grams (2 lbs.) and 44 cm (17 inches) in length, while the adult male is on average 1050 grams (2.3 lbs.) and 48 cm (19 inches) in length, making this the smallest species of scoter on average. It is characterised by its bulky shape and large bill. The male is all black, except for white patches on the nape and forehead. It has a bulbous red, yellow and white bill. The females are brown bird
Bird
Birds are feathered, winged, bipedal, endothermic , egg-laying, vertebrate animals. Around 10,000 living species and 188 families makes them the most speciose class of tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. Extant birds range in size from...
s with pale head patches. The wedge-shaped head and lack of white in the wings helps to distinguish female Surf Scoters from female Velvet Scoter
Velvet Scoter
The Velvet Scoter , also called a Velvet Duck or whitewing , is a large sea duck, which breeds over the far north of Europe and Asia west of the Yenisey basin. A small, isolated population nests in eastern Turkey...
s.
Adult scoters of this species dive for crustacean
Crustacean
Crustaceans form a very large group of arthropods, usually treated as a subphylum, which includes such familiar animals as crabs, lobsters, crayfish, shrimp, krill and barnacles. The 50,000 described species range in size from Stygotantulus stocki at , to the Japanese spider crab with a leg span...
s and molluscs, while the ducklings live off any variety of freshwater invertebrate
Invertebrate
An invertebrate is an animal without a backbone. The group includes 97% of all animal species – all animals except those in the chordate subphylum Vertebrata .Invertebrates form a paraphyletic group...
s.
In November, 2007, an oil spill in San Francisco harbour oiled and killed thousands of birds including many Surf Scoters. About 40 per cent of the birds affected were from this species. Scientists said that while the species is not endangered it has declined 50 to 70 per cent over the past 40 years and this spill could decrease populations since most of the affected birds are healthy adults.
External links
- Photo of Surf scoters wintering on the Salish sea (Canada BC)
- Surf Scoter Species Account - Cornell Lab of Ornithology
- Surf Scoter Melanitta perspicillata - USGS Patuxent Bird Identification InfoCenter
- Surf Scoter Information - South Dakota Birds and Birding
- Surf Scoter videos on the Internet Bird Collection
- Surf Scoter photo gallery VIREO