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 petrels 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 th ...

and south-eastern

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

Taxonomy and nomenclature

The American

ornithologist Ornithology is a branch of zoology that concerns the "methodological study and consequent knowledge of birds with all that relates to them." Several aspects of ornithology differ from related disciplines, due partly to the high visibility and th ...

Robert Cushman Murphy and the zoologist Francis Harper described the South Georgia diving petrel in 1916. Its specific name, ''georgicus,'' is derived from the

South Georgia South Georgia ( es, Isla San Pedro) is an island in the South Atlantic Ocean that is part of the British Overseas Territory of South Georgia and the South Sandwich Islands. It lies around east of the Falkland Islands. Stretching in the east� ...

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 collabor ...

Description

The South Georgia diving petrel is a small, plump petrel, in length and weighing around . Its

plumage Plumage ( "feather") 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, ...

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 (''Pelecanoides urinatrix''), also known as the smaller diving petrel or simply the diving petrel, is a diving petrel, one of four very similar auk-like small petrels of the southern oceans. It is native to South Atlant ...

; 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 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 The Crozet Islands (french: Îles Crozet; or, officially, ''Archipel Crozet'') are a sub-Antarctic archipelago of small islands in the southern Indian Ocean. They form one of the five administrative districts of the French Southern and Antarcti ...

Kerguelen Islands The Kerguelen Islands ( or ; in French commonly ' but officially ', ), also known as the Desolation Islands (' in French), are a group of islands in the sub-Antarctic constituting one of the two exposed parts of the Kerguelen Plateau, a large ...

and Heard Island and McDonald Islands in the southern Indian Ocean. It disperses to surrounding seas and vagrants 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 Dubouzet ...

and

. 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 Hydrosphere, water (or atmosphere, air) that are unable to propel themselves against a Ocean current, current (or wind). The individual organisms constituting plankton are called plankt ...

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 ...

s, particularly krill, but will also feed on small fish and young

cephalopod A cephalopod is any member of the molluscan class Cephalopoda (Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head ...

s. 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 jae ...

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 The South Georgia diving petrel or Georgian diving-petrel (''Pelecanoides georgicus'') is one of five very similar small auk-like diving petrels of the southern oceans. It is native to the South Atlantic and islands of the southern Indian Ocean a ...

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

Taxonomy articles created by Polbot