Northern royal albatross

Last updated

Northern royal albatross
Diomedea sanfordi - SE Tasmania 2019.jpg
Northern royal albatross
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Procellariiformes
Family: Diomedeidae
Genus: Diomedea
Species:
D. sanfordi
Binomial name
Diomedea sanfordi
Murphy, 1917 [2]
Synonyms

Diomedea epomophora sanfordi(Murphy, 1917) [2]

The northern royal albatross or toroa, [3] (Diomedea sanfordi) is a large seabird in the albatross family. It was split from the closely related southern royal albatross as recently as 1998, though not all scientists support that conclusion and some consider both of them to be subspecies of the royal albatross. [4]

Contents

Etymology

Diomedea sanfordi breaks into Diomedea, referring to Diomedes, whose companions turned to birds, [5] and sanfordi, in honor of Leonard Cutler Sanford (1868–1950), ornithologist, and trustee of the American Museum of Natural History. [6]

Taxonomy

Albatrosses belong to the family Diomedeidae of the order Procellariiformes, along with shearwaters, fulmars, storm petrels, and diving petrels. They share certain identifying features. First, they have nasal passages that attach to the upper bill called naricorns, although the nostrils on the albatross are on the sides of the bill. The bills of Procellariiformes are also unique in that they are split into between seven and nine horny plates. Finally, they produce a stomach oil made up of wax esters and triglycerides that are stored in the proventriculus. This is used against predators as well as an energy-rich food source for chicks and adults during their long flights. [7]

The northern royal albatross was first described as Diomedea sanfordi by Robert Cushman Murphy, in 1917, based on a specimen from the Chatham Islands. [3]

Description

The northern royal albatross is typically about 115 cm (45 in), [8] weighs 6.2 to 8.2 kg (14–18 lb), and has a wingspan from 270 to 305 cm (106–120 in). [3] [9] The juvenile has a white head, neck, upper mantle, rump, and underparts. There is dark speckling on the crown and rump. Its lower mantle and back are white with more black speckling than the crown, and it has dark black-brown upper wings with white flecks on its coverts. Its tail is white with a black-brown tip, as are its underwings. There is a black band behind the leading edge of its wings between the carpal joint and the tip. As they age, their head, back, rump, tail, and scapular region whiten. All ages have a pink bill with a black cutting edge on the upper mandible, along with pale pink legs. [8] The northern royal albatross can be distinguished from the southern at sea by its upper wings, the plumage of which are all dark compared to the large areas of white on the southern. The two species also differ in behavior.

Behavior

Feeding

The northern royal albatross feeds on cephalopods, fish, crustaceans, salps, and carrion. [8] Squids can make up 85% of their diet.

Reproduction

Young northern royal albatross in the colony on Taiaroa Head, New Zealand Immature Northern Royal Albatross.jpg
Young northern royal albatross in the colony on Taiaroa Head, New Zealand

They perform a very extensive mutual or group display, sometimes in the air or on the water. Once they form a bond, the displays lose extravagance. Breeding starts at eight years. [3] They nest biennially and will build their nests on flat summits of the islands that they frequent. They prefer to be in grass or herbs, and their nest is a low mound of vegetation, mud, and feathers. [8] A single egg is laid, in October or November, which takes both parents around 80 days to incubate. The chick is brooded for a month and is ready to fledge after around 240 days. Their colonies are denser than those of any other great albatross.

Breeding population and trends [8]
LocationPopulationDateTrend
Chatham Islands 6,500–7,000 pairs2012Stable
Taiaroa Head, South Island 60 pairs2012Increasing
Total20,0002012Stable

Range

Northern royal albatrosses nest on the Chatham Islands (Forty-fours Island, Big Sister Island, and Little Sister Island), Enderby Island in the Auckland Islands, and Taiaroa Head on the Otago Peninsula of New Zealand. The Taiaroa Head colony is the only albatross colony found on a human-inhabited mainland in the Southern Hemisphere. When they are not breeding, northern royal albatrosses undertake circumpolar flights in the southern oceans, and in particular like the Humboldt Current and the Patagonian Shelf. [8]

Diomedea sanfordi - south east Tasmania Diomedea sanfordi - SE Tasmania.jpg
Diomedea sanfordi – south east Tasmania

Conservation

Northern royal albatrosses are listed as an endangered species by the IUCN, [1] and they have an occurrence range of 64,300,000 km2 (24,800,000 sq mi), with a breeding range of 8 km2 (3.1 sq mi). [8] 6,500 to 7,000 pairs breed on the Chatham Islands annually along with 60 pairs at Taiaroa Head, for an estimated total of 20,000 birds, although this is a 2012 estimate. 2022 estimates place the count at 17,000 birds. In 1985, their main breeding grounds on the Chatham Islands were badly damaged by a series of intense storms and the resulting lack of nesting material has lowered their breeding success. Chicks and eggs of birds breeding on the South Island have also been preyed upon by introduced species, such as cats, bottle flies, and stoats. Finally, longline fishing is the biggest threat to this bird, even though it has been reduced.

To help in the survival of this species, bird banding is underway, Taiaroa Head has predator control in effect during the breeding season, and there are no predators on the Chatham Islands. Enderby Island and Taiaroa Head are nature preserves, and the Department of Conservation had eradicated feral cattle, rabbits, and mice from Enderby Island by 1993. [10] Counting of individual birds has been made possible using 30-cm resolution imagery from the WorldView-3 satellite. [11]

Thanks to the efforts of L. E. Richdale, the colony on Taiaroa Head was protected by 1950. 1972 saw the first formal guided viewing of their breeding area, since 2001 more than 100,000 people visit the Royal Albatross Centre annually to watch this species. [3] It has become a tradition in Dunedin each year to chime the bells in the city's public buildings in celebration of the first bird to arrive back at the Taiaroa Head colony. [12]

Footnotes

  1. 1 2 BirdLife International (2018). "Diomedea sanfordi". IUCN Red List of Threatened Species . 2018: e.T22728323A132656392. doi: 10.2305/IUCN.UK.2018-2.RLTS.T22728323A132656392.en . Retrieved 12 July 2021.
  2. 1 2 Brands, S. (2008)
  3. 1 2 3 4 5 Robertson, C. J. R. (2003)
  4. Clements, J. (2007)
  5. Gotch, A. F. (1995)
  6. Beolens, B., Watkins, M. & Grayson, M., The Eponym Dictionary of Mammals (2009), p.357
  7. Double, M. C. (2003)
  8. 1 2 3 4 5 6 7 BirdLife International (2021)
  9. Answers.com
  10. Veitch, C. R., et al. (2002)
  11. Fretwell, P. T.; Scofield, P; Phillips, R. A. (3 May 2017). "Using super-high resolution satellite imagery to census threatened albatrosses" (PDF). Ibis . 159 (3): 481. doi:10.1111/ibi.12482.
  12. Foon, Eleisha (2019-09-17). "Dunedin's bells set to ring as city celebrates its albatross". RNZ. Retrieved 2019-09-19.

Related Research Articles

<span class="mw-page-title-main">Procellariiformes</span> Order of birds

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.

<span class="mw-page-title-main">Waved albatross</span> Species of bird

The waved albatross, also known as Galapagos albatross, is one of three species of the family Diomedeidae that occur in the tropics. When they forage, they follow a straight path to a single site off the coast of Peru, about 1,000 km (620 mi) to the east. During the non-breeding season, these birds reside primarily on the Ecuadorian and Peruvian coasts.

<span class="mw-page-title-main">Chatham albatross</span> Species of bird

The Chatham albatross, also known as the Chatham mollymawk or Chatham Island mollymawk, is a medium-sized black-and-white albatross which breeds only on The Pyramid, a large rock stack in the Chatham Islands, New Zealand (Aotearoa). It is sometimes treated as a subspecies of the shy albatross Thalassarche cauta. It is the smallest of the shy albatross group.

<span class="mw-page-title-main">Black-footed albatross</span> Species of bird

The black-footed albatross is a large seabird of the albatross family Diomedeidae from the North Pacific. All but 2.5% of the population is found among the Northwestern Hawaiian Islands. It is one of three species of albatross that range in the northern hemisphere, nesting on isolated tropical islands. Unlike many albatrosses, it is dark plumaged.

<span class="mw-page-title-main">Mollymawk</span> Genus of birds

The mollymawks are a group of medium-sized albatrosses that form the genus Thalassarche. The name has sometimes been used for the genus Phoebetria as well, but these are usually called sooty albatrosses. They are restricted to the Southern Hemisphere, where they are the most common of the albatrosses. They were long considered to be in the same genus as the great albatrosses, Diomedea, but a study of their mitochondrial DNA showed that they are a monophyletic taxon related to the sooty albatrosses, and they were placed in their own genus.

<span class="mw-page-title-main">Salvin's albatross</span> Species of bird

Salvin's albatross or Salvin's mollymawk, is a large seabird that breeds mainly on the Bounty Islands of New Zealand, with scant amounts on islands across the Southern Ocean. A medium-sized mollymawk, it was long considered to be a subspecies of the shy albatross.

<span class="mw-page-title-main">Sooty albatross</span> Seabird in the family Diomedeidae

The sooty albatross is a species of marine bird belonging to the albatross family Diomedeidae. It is a medium-sized albatross that sports a sooty-brown or sooty-black color. It can be found in the southern Atlantic Ocean, the southern Indian Ocean, and the Southern Ocean. This bird scavenges for squid, fish, and carrion. Like other albatrosses, these birds mate for life and return to the same breeding spots every season. A single pair will mate every other year on a variety of islands in the southern Atlantic Ocean and the southern Indian Ocean islands. This bird is an endangered species and conservation efforts are taking place.

<span class="mw-page-title-main">Grey-headed albatross</span> Species of bird

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.

<span class="mw-page-title-main">North Pacific albatross</span> Genus of birds

The North Pacific albatrosses are large seabirds from the genus Phoebastria in the albatross family. They are the most tropical of the albatrosses, with two species nesting in the Northwestern Hawaiian Islands, one on sub-tropical islands south of Japan, and one nesting on the equator.

<span class="mw-page-title-main">Buller's albatross</span> Species of bird

Buller's albatross or Buller's mollymawk, is a small mollymawk in the albatross family.

<span class="mw-page-title-main">Light-mantled albatross</span> Species of bird

The light-mantled albatross also known as the grey-mantled albatross or the light-mantled sooty albatross, is a small albatross in the genus Phoebetria, which it shares with the sooty albatross. The light-mantled albatross was first described as Phoebetria palpebrata by Johann Reinhold Forster, in 1785, based on a specimen from south of the Cape of Good Hope.

<span class="mw-page-title-main">Campbell albatross</span> Species of bird

The Campbell albatross or Campbell mollymawk, is a medium-sized mollymawk in the albatross family. It breeds only on Campbell Island and the associated islet of Jeanette Marie, in a small New Zealand island group in the South Pacific. It is sometimes considered a subspecies of the black-browed albatross. It is a medium-sized black and white albatross with a pale yellow iris.

<span class="mw-page-title-main">Indian yellow-nosed albatross</span> Member of the albatross family, Diomedeidae

The Indian yellow-nosed albatross is a member of the albatross family, and is the smallest of the mollymawks. In 2004, BirdLife International split this species from the Atlantic yellow-nosed albatross; however Clements has not split it yet, and the SACC has not either, but recognises the need for a proposal.

<span class="mw-page-title-main">Antipodean albatross</span> Species of bird

The Antipodean albatross is a large seabird in the albatross family. Antipodean albatrosses are smaller than wandering albatrosses, and breed in predominantly brown plumage, but are otherwise difficult to distinguish from young wanderers.

<span class="mw-page-title-main">Southern royal albatross</span> Species of bird

The southern royal albatross or toroa, is a large seabird from the albatross family. At an average wingspan of above 3 m (9.8 ft), it is one of the two largest species of albatross, together with the wandering albatross. Recent studies indicate that the southern royal albatross may, on average, be somewhat larger than the wandering albatross in mass and have a similar wingspan, although other sources indicate roughly similar size for the two species and the wandering species may have a larger average wingspan in some colonies.

<span class="mw-page-title-main">Tristan albatross</span> Large seabird from the family Diomedeidae

The Tristan albatross is a large seabird from the albatross family. One of the great albatrosses of the genus Diomedea, it was only widely recognised as a full species in 1998.

<span class="mw-page-title-main">Albatross</span> Family of large seabirds

Albatrosses, of the biological family Diomedeidae, are large seabirds related to the procellariids, storm petrels, and diving petrels in the order Procellariiformes. They range widely in the Southern Ocean and the North Pacific. They are absent from the North Atlantic, although fossil remains show they once occurred there and occasional vagrants are found. Albatrosses are among the largest of flying birds, and species of the genus Diomedea have the longest wingspans of any extant birds, reaching up to 3.7 m (12 ft). The albatrosses are usually regarded as falling into four genera, but disagreement exists over the number of species.

<span class="mw-page-title-main">Broad-billed prion</span> Species of bird

The broad-billed prion is a small pelagic seabird in the shearwater and petrel family, Procellariidae. It is the largest prion, with grey upperparts plumage, and white underparts. The sexes are alike. It ranges from the southeast Atlantic to New Zealand mainly near the Antarctic Convergence. In the south Atlantic it breeds on Tristan da Cunha and Gough Island; in the south Pacific it breeds on islands off the south coast of South Island, New Zealand and on the Chatham Islands. It has many other names that have been used such as blue-billed dove-petrel, broad-billed dove-petrel, long-billed prion, common prion, icebird, and whalebird.

<span class="mw-page-title-main">Fulmar prion</span> Species of bird

The fulmar prion is a species of seabird in the family Procellariidae, found in the southern oceans.

<span class="mw-page-title-main">Salvin's prion</span> Species of bird

Salvin's prion, also known as the medium-billed prion, is a species of seabird in the petrel family Procellariidae.

References