Diving petrel | |
---|---|
Peruvian diving petrel (Pelecanoides garnotii) | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Procellariiformes |
Family: | Procellariidae |
Genus: | Pelecanoides Lacépède, 1799 |
Type species | |
Procellaria urinatrix (common diving petrel) Gmelin, 1789 | |
Species | |
Pelecanoides garnotii Contents | |
Synonyms | |
HaladromaIlliger, 1811 OnocralusRafinesque, 1815 (nomen novum) PuffinuriaR.-P. Lesson, 1828 PorthmornisMurphy & Harper, 1921 PelagodyptesMurphy & Harpter, 1921 |
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.
Diving petrels are auk-like small petrels of the southern oceans. The resemblances with the auks are due to convergent evolution, since both families feed by pursuit diving, although some researchers have in the past suggested that the similarities are due to relatedness. Among the Procellariiformes the diving petrels are the family most adapted to life in the sea rather than flying over it, and are generally found closer inshore than other families in the order.
The genus Pelecanoides was introduced in 1799 by the French naturalist Bernard Germain de Lacépède for the common diving petrel. [1] [2] The genus name combines the Ancient Greek pelekan meaning "pelican" and "-oidēs" meaning "resembling". [3]
The diving petrels were formerly placed in their own family, Pelecanoididae. [2] When genetic studies found that they were embedded within the family Procellariidae, the family Pelecanoididae were merged into Procellariidae. [4] [5]
Four species are usually recognised: [6]
Image | Scientific name | Common Name | Distribution |
---|---|---|---|
Pelecanoides garnotii | Peruvian diving-petrel | Coasts and islands of Peru and Chile. | |
Pelecanoides magellani | Magellanic diving-petrel | Channels and fjords of southern Chile and Tierra del Fuego. | |
Pelecanoides georgicus | South Georgia diving-petrel | South Georgia and surrounding islets 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 | |
Pelecanoides urinatrix | Common diving-petrel | Most widespread species; found on New Zealand islands such as the Solander Islands / Hautere, Snares Islands / Tini Heke, Chatham Islands, Auckland Islands, Antipodes Islands, Campbell Island / Motu Ihupuku, and numerous islands off the North Island; islands off southeast Australia and Tasmania, islands around the Australia-administered Macquarie Island, subantarctic islands of the Indian Ocean including the Prince Edward Islands, Crozet Islands, Kerguelen Islands, and Heard and McDonald Islands; in the Atlantic, it breeds at South Georgia, Tristan da Cunha Islands, Gough Island, Falkland Islands, and subspecies coppingeri assumed to breed in uncertain areas in Chile. | |
A fifth species, the Whenua Hou diving-petrel (Pelecanoides whenuahouensis), is sometimes recognised. [7] It was first described in 2018 and is found around Codfish Island / Whenua Hou, New Zealand. [8] In the bird list maintained by Frank Gill, Pamela Rasmussen and David Donsker on behalf of the International Ornithological Committee the Whenua Hou diving-petrel is treated as a subspecies of the South Georgia diving petrel. [6]
The evolution and systematics of these birds is not well researched. Several populations were described as distinct species and while most of them are only subspecies, some may indeed be distinct. The prehistoric fossil record was long limited to very fragmentary remains described as P. cymatotrypetes found in Early Pliocene deposits of Langebaanweg, South Africa; while this bird apparently was close to the common diving petrel, no members of the genus are known from South African waters today. [9]
In 2007, a humerus piece from New Zealand was described as P. miokuaka . This was found in Early/Middle Miocene deposits and just as may be expected, it far more resembles diving petrels than any other known bird, but presents a less apomorphic condition. [10]
The diving petrels are small petrels that measure between 19–23 cm (7.5–9 in) and weigh 120–200 g (4.2–7.1 oz). They are highly uniform in appearance, and very difficult to distinguish when seen at sea. They are best distinguished by the size and shape of their short bills. The plumage is shining black on the top and white on the underside. Their wings are short, particularly with regards to overall body size, and used in a highly characteristic whirring flight. This flight is low over the water and diving petrels will fly through the crests of waves without any interruption of their flight path. In the water these wings are half folded and used as paddles to propel the bird after its prey.
Diving petrels are plankton feeders, taking mostly crustacean prey such as krill, copepods and the amphipod Themisto gaudichaudii , also taking small fish and squid. They have several adaptations for obtaining their prey including short powerful wings, a gular pouch for storing food, and their nostrils open upwards rather than pointing forward as in other tubenoses.
These birds nest in colonies on islands. One white egg is laid in a burrow in turf or soft soil that is usually covered with vegetation, feathers, or small rocks. They are nocturnal at the breeding colonies. It has a long period of parental care (around 45 to 60 days) in the burrow, but once the chick fledges out to sea it is on its own.
Of the four species, two, the Peruvian diving petrel and the Magellanic diving petrel, have highly restricted ranges around South America's coasts, while the common diving petrel and the South Georgia diving petrel range widely across the southern oceans, breeding on islands off New Zealand, Subantarctic islands in the Indian Ocean, and islands in the south Atlantic (like Tristan da Cunha). The subspecies, the Whenua Hou diving petrel, has an extremely restricted range, breeding only on New Zealand's Codfish Island / Whenua Hou. [8]
Diving petrels are among the world's most numerous birds, with common and South Georgia diving petrels numbering several million pairs each. The Peruvian and Whenua Hou diving petrels, on the other hand, are highly threatened by guano extraction, introduced species and climate change, and are considered endangered species.
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.
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 southern fulmar is a seabird of the Southern Hemisphere. Along with the northern fulmar, F. glacialis, it belongs to the fulmar genus Fulmarus in the family Procellariidae, the true petrels. It is also known as the Antarctic fulmar or silver-grey fulmar.
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.
Puffinus is a genus of seabirds in the order Procellariiformes that contains about 20 small to medium-sized shearwaters. Two other shearwater genera are named: Calonectris, which comprises three or four large shearwaters, and Ardenna with another seven species.
Codfish Island / Whenua Hou is a small island located to the west of Stewart Island in southern New Zealand. It reaches a height of 250 m (820 ft) close to the south coast. The island is home to Sirocco, an internationally famous kākāpō, a rare species of parrot.
The wedge-tailed shearwater is a medium-large shearwater in the seabird family Procellariidae. It is one of the shearwater species that is sometimes referred to as a muttonbird, like the sooty shearwater of New Zealand and the short-tailed shearwater of Australia. It is found throughout the tropical Pacific and Indian Oceans, roughly between latitudes 35°N and 35°S. It breeds on the islands off Japan, on the Islas Revillagigedo, the Hawaiian Islands, the Seychelles, the Northern Mariana Islands, and off Eastern and Western Australia.
The Peruvian diving petrel is a small seabird that feeds in offshore waters in the Humboldt Current off Peru and Chile.
Giant petrels form a genus, Macronectes, from the family Procellariidae, which consists of two living and one extinct species. They are the largest birds in this family. The living species are restricted to the Southern Hemisphere, and though their distributions overlap significantly, with both species breeding on the Prince Edward Islands, Crozet Islands, Kerguelen Islands, Macquarie Island, and South Georgia, many southern giant petrels nest farther south, with colonies as far south as Antarctica. Giant petrels are extremely aggressive predators and scavengers, inspiring another common name, the stinker. Seamen and whalers used to call the giant petrel as the molly-hawk, gong, glutton bird and nelly. They are the only member of their family that is capable of walking on land.
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.
Pseudobulweria is a genus of seabirds in the family Procellariidae. They have long been retained with the gadfly petrel genus Pterodroma despite morphological differences. Mitochondrial DNA cytochrome b sequence analysis has confirmed the split out of Pterodroma and places the genus closer to shearwaters. They thus represent either a plesiomorphic lineage still sharing some traits of the ancestral Procellariidae with the gadfly petrels, or convergent evolution of a shearwater to the ecological niche of gadfly petrels.
The Antarctic prion also known as the dove prion, or totorore in Māori, is the largest of the prions, a genus of small petrels of the Southern Ocean.
The white-necked petrel, also known as the white-naped petrel, is a species of seabird in the family Procellariidae. During the non-breeding season it occurs throughout a large part of the Pacific, but it is only known to breed on Macauley Island in New Zealand's Kermadec Islands and the Australian territory of Norfolk Island and Phillip Island. It formerly bred on Raoul Island, but has now been extirpated from this locality due to predation by rats and cats. Reports of breeding on Merelava, Vanuatu, are more likely to be the very similar Vanuatu petrel, P. occulta, which some consider to be a subspecies of the white-necked petrel. The IUCN rating as vulnerable is for the "combined" species.
The South Georgia diving petrel or Georgian diving-petrel 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 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.