The South Georgia diving petrel or Georgian diving-petrel (''Pelecanoides georgicus'') is one of five very similar small

auk An auk or alcid is a bird of the family Alcidae in the order Charadriiformes. The alcid family includes the murres, guillemots, auklets, puffins, and murrelets. The word "auk" is derived from Icelandic ''álka'', from Old Norse ''alka'' (a ...

-like

diving petrel The diving petrels form a genus, ''Pelecanoides'', of seabirds in the family Procellariidae. There are four very similar species of diving petrels, distinguished only by small differences in the coloration of their plumage, habitat, and bill co ...

s of the southern oceans. It is native to the

South Atlantic The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe an ...

and islands of the southern

Indian Ocean The Indian Ocean is the third-largest of the world's five oceanic divisions, covering or ~19.8% of the water on Earth's surface. It is bounded by Asia to the north, Africa to the west and Australia to the east. To the south it is bounded by t ...

and south-eastern Australia.

Taxonomy and nomenclature

The American ornithologist

Robert Cushman Murphy The whaling ship, ''Daisy'', which Murphy traveled on to the Antarctic Robert Cushman Murphy (April 29, 1887 – March 20, 1973) was an American ornithologist and Lamont Curator of birds at the American Museum of Natural History. He went on numer ...

and the zoologist Francis Harper described the South Georgia diving petrel in 1916. Its specific name, ''georgicus,'' is derived from the South Georgia islands where they identified the species. Other common names include ''puffinure de Géorgie du Sud'' (French), ''Breitschnabel Lummensturmvogel'' (German), and ''potoyunco de Georgia'' (Spanish). A unique New Zealand population is now considered a separate species, the

Whenua Hou diving petrel The Whenua Hou diving-petrel (''Pelecanoides georgicus whenuahouensis'') is a highly endangered subspecies of the South Georgia diving petrel that is endemic to New Zealand. The subspecies was first described by Johannes H. Fischer and collab ...

Description

The South Georgia diving petrel is a small, plump petrel, in length and weighing around . Its plumage is black above and dull white below, and it has a stubby black bill with pale blue edges. The wings have thin white strips. The face and neck can be more brown than black. The legs are blue with posterior black lines down the tarsi. Unless seen very close, it is almost indistinguishable from the common diving petrel; the common diving petrel has brown inner web primary feathers, whereas the South Georgia diving petrel has light inner web feathering. Common diving petrels have smaller and narrower bills than the South Georgia diving petrel, and there are also slight size differences.

Distribution and habitat

This species nests in colonies on

Subantarctic The sub-Antarctic zone is a region in the Southern Hemisphere, located immediately north of the Antarctic region. This translates roughly to a latitude of between 46° and 60° south of the Equator. The subantarctic region includes many islands ...

islands. It breeds on South Georgia in the south Atlantic and on the

Prince Edward Islands The Prince Edward Islands are two small uninhabited islands in the sub-Antarctic Indian Ocean that are part of South Africa. The islands are named Marion Island (named after Marc-Joseph Marion du Fresne, 1724–1772) and Prince Edward Island ...

, Crozet Islands, Kerguelen Islands and

Heard Island and McDonald Islands The Territory of Heard Island and McDonald Islands (HIMI) is an Australian external territory comprising a volcanic group of mostly barren Antarctic islands, about two-thirds of the way from Madagascar to Antarctica. The group's overall size ...

in the southern Indian Ocean. It disperses to surrounding seas and

vagrants Vagrancy is the condition of homelessness without regular employment or income. Vagrants (also known as bums, vagabonds, rogues, tramps or drifters) usually live in poverty and support themselves by begging, scavenging, petty theft, tempora ...

have been recorded in the

Falkland Islands The Falkland Islands (; es, Islas Malvinas, link=no ) is an archipelago in the South Atlantic Ocean on the Patagonian Shelf. The principal islands are about east of South America's southern Patagonian coast and about from Cape Dubouze ...

and Australia. While nesting burrows are usually built on scree slopes above the vegetation line, they are occasionally built on flat land.

Behaviour

The South Georgia diving petrel feeds primarily on

plankton Plankton are the diverse collection of organisms found in water (or air) that are unable to propel themselves against a current (or wind). The individual organisms constituting plankton are called plankters. In the ocean, they provide a crucia ...

crustacean Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean group can ...

s, particularly

krill Krill are small crustaceans of the order Euphausiacea, and are found in all the world's oceans. The name "krill" comes from the Norwegian word ', meaning "small fry of fish", which is also often attributed to species of fish. Krill are consi ...

, but will also feed on small fish and young cephalopods. Breeding season is October–February. The female lays one egg that is incubated for 44–52 days. Fledging occurs in 43–60 days. Threats to the South Georgia diving petrel include

skua The skuas are a group of predatory seabirds with seven species forming the genus ''Stercorarius'', the only genus in the family Stercorariidae. The three smaller skuas, the long-tailed skua, the Arctic skua, and the pomarine skua are called ...

s, cats and rats. South Georgia diving petrels are noted for their diving capabilities: "The most proficient divers of the order ''Procellariformes'' are likely to be the diving petrels in the family ''Pelecanoididae''." Dive depths for the South Georgia diving petrel have been recorded to , with most in the range of .

References

External links

{{Taxonbar, from=Q1270542 South Georgia diving petrel Birds of islands of the Atlantic Ocean Birds of the Indian Ocean Birds of the Campbell Islands Birds of subantarctic islands Fauna of the Prince Edward Islands Fauna of Heard Island and McDonald Islands Fauna of the Crozet Islands Fauna of the Auckland Islands South Georgia diving petrel South Georgia diving petrel Taxonomy articles created by Polbot