South Georgia diving petrel | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Procellariiformes |
Family: | Procellariidae |
Genus: | Pelecanoides |
Species: | P. georgicus |
Binomial name | |
Pelecanoides georgicus | |
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 and south-eastern Australia.
The American ornithologist Robert Cushman Murphy and the zoologist Francis Harper described the South Georgia diving petrel in 1916. [1] [2] 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). [3] A unique New Zealand population is now considered a separate species, the Whenua Hou diving petrel. [4]
The South Georgia diving petrel is a small, plump petrel, 180 to 220 mm (7.1–8.7 in) in length and weighing around 90 to 150 g (3.2–5.3 oz). [5] Its plumage is black above and dull white below, and it has a stubby black bill with pale blue edges. [6] 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. [6] 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, [6] [7] and there are also slight size differences. [8]
This species nests in colonies on Subantarctic islands. It breeds on South Georgia in the south Atlantic and on the Prince Edward Islands, Crozet Islands, Kerguelen Islands and Heard Island and McDonald Islands in the southern Indian Ocean. [9] [10] It disperses to surrounding seas and vagrants have been recorded in the Falkland Islands and Australia. [1] While 1.5 m (4.9 ft) nesting burrows are usually built on scree slopes above the vegetation line, they are occasionally built on flat land. [5] [6]
The South Georgia diving petrel feeds primarily on planktonic crustaceans, particularly krill, but will also feed on small fish and young cephalopods. Breeding season is October–February. [11] The female lays one egg that is incubated for 44–52 days. Fledging occurs in 43–60 days. [5] Threats to the South Georgia diving petrel include skuas, 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." [12] Dive depths for the South Georgia diving petrel have been recorded to 48.6 m (159 ft), with most in the range of 20.4 to 24.4 m (67–80 ft). [12]
Procellariiformes is an order of seabirds that comprises four families: the albatrosses, the petrels and shearwaters, and two families of storm petrels. Formerly called Tubinares and still called tubenoses in English, procellariiforms are often referred to collectively as the petrels, a term that has been applied to all members of the order, or more commonly all the families except the albatrosses. They are almost exclusively pelagic, and have a cosmopolitan distribution across the world's oceans, with the highest diversity being around New Zealand.
Seabirds are birds that are adapted to life within the marine environment. While seabirds vary greatly in lifestyle, behaviour and physiology, they often exhibit striking convergent evolution, as the same environmental problems and feeding niches have resulted in similar adaptations. The first seabirds evolved in the Cretaceous period, and modern seabird families emerged in the Paleogene.
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 construction. They are only found in the southern hemisphere. The diving petrels were formerly placed in their own family, the Pelecanoididae.
The family Procellariidae is a group of seabirds that comprises the fulmarine petrels, the gadfly petrels, the diving petrels, the prions, and the shearwaters. This family is part of the bird order Procellariiformes, which also includes the albatrosses and the storm petrels.
The Magellanic diving-petrel is a species of diving petrel, one of five very similar, small, auk-like petrels found exclusively in the southern oceans. It is one of the smaller species of diving-petrels, though size differences are seemingly indistinguishable between species unless seen up close. It is probably the least known of all five species.
The Peruvian diving petrel is a small seabird that feeds in offshore waters in the Humboldt Current off Peru and Chile.
The grey-headed albatross also known as the gray-headed mollymawk, is a large seabird from the albatross family. It has a circumpolar distribution, nesting on isolated islands in the Southern Ocean and feeding at high latitudes, further south than any of the other mollymawks. Its name derives from its ashy-gray head, throat and upper neck.
The common diving petrel , 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 Atlantic islands and islands of the subantarctic southern Indian Ocean, islands and islets off New Zealand and south-eastern Australian islands.
The white-chinned petrel also known as the Cape hen and shoemaker, is a large shearwater in the family Procellariidae. It ranges around the Southern Ocean as far north as southern Australia, Peru and Namibia, and breeds colonially on scattered islands. The white-chinned petrel was formerly considered to be conspecific with the spectacled petrel.
The Southern Indian Ocean Islands tundra is a tundra ecoregion that includes several subantarctic islands in the southern Indian Ocean.
Pelecanoides miokuaka is an extinct species of diving petrel of New Zealand. Described in 2007, it is known only from a single humerus bone that was discovered from early Miocene sediments of the Manuherikia Group.
The Whenua Hou diving-petrel known also as Kuaka, is a highly endangered subspecies of the South Georgia diving petrel that is endemic to New Zealand.