Antipodean albatross

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Antipodean albatross
Diomedea antipodensis gibsoni
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Procellariiformes
Family: Diomedeidae
Genus: Diomedea
Species:
D. antipodensis
Binomial name
Diomedea antipodensis
Robertson & Warham, 1992[2]
Subspecies

Diomedea antipodensis antipodensis Robertson & Warham 1992[2]
Diomedea antipodensis gibsoni[3]

Synonyms

Diomedea exulans antipodensis
Robertson & Warham 1992[2]

The Antipodean albatross (Diomedea antipodensis) (Māori: Toroa)[4] is a large seabird in the albatross family. Antipodean albatrosses are smaller than snowy albatrosses, and breed in predominantly brown plumage, but are otherwise difficult to distinguish from young snowy albatrosses (snowy albatrosses grow lighter in color with age, while the Antipodean stays darker).

Etymology

Diomedea antipodensis breaks into Diomedea referring to Diomedes, whose companions turned to birds, and antipodensis, the Latin form of the Antipodes Islands, where they are found.[5]

Taxonomy

The Antipodean albatross belongs to the

SACC has a proposal on the table to split it.[8]

Subspecies

There are two sub-species; however there was a study in 1998 that suggested splitting this species,[9] though this was not accepted in a 2004 study.[10]

Image Subspecies Distribution
Diomedea antipodensis antipodensis nominate race, breeds on the Antipodes Islands and Campbell Island[2]
Diomedea antipodensis gibsoni breeds on the Auckland Islands[2]

Description

The Antipodean is large, at 110 cm (43 in) in length.

vermiculations on their back. Its face, throat, lower breast, and belly are white, and its undertail coverts are brown. Its underwings are also white, but with a dark tip. Breeding males are whiter than females, but not as white as the snowy albatross, and both sexes have a pink bill. The females of the nominate race have a dark brown breast band and the males have a darker cap, tail, and humeral flexure than gibsoni.[2]

Range and habitat

Breeding Population and Trends[2]
Location Population Date Trend
Antipodes Island
4,635-5,737 pair 2007 Declining
Auckland Islands 5,800 pair 2007 Declining
Campbell Islands 10 pair 2007
Pitt Island 1 pair 2004
Total 25,000 2007 Declining

At sea Antipodean albatrosses range across the South

Pacific from Australia to as far as Chile, from the Tropic of Capricorn south. The gibsonii seems to range to the east of Auckland Island, and the nominate race ranges to the east to Chile. They breed on the Auckland Islands, Antipodes Islands, and Campbell Island.[2]

Behaviour

They feed predominantly on cephalopod and to a lesser extent fish[2] (unlike other albatross species they are not recorded eating any crustaceans), and have been recorded visiting the spawning grounds of the giant cuttlefish off New South Wales. They nest on ridges, slopes, or plateaus, and will build their nest in the open or within patchy vegetation, such as tussock grassland.[2]

Conservation

The

Antipodes Island, 5,800 pairs on the Auckland Islands (Adams Island, Auckland Island, and Disappointment Island), and 10 pair on Campbell Island. There has been 1 pair breeding on Pitt Island, Chatham Islands since 2004. This places the total population at 25,300. Both breeding success (25%) and adult survival rates (80% female & 88% male) have been declining.[2]

Pigs and feral cats are hurting the population on Auckland Island and longline fishing is still impacting them. Recent studies have shown that a rise in Tasman Sea temperature may be impacting gibsoni.[2]

Banding has been an ongoing process, and will continue with satellite tracking of the species. Cattle and sheep have been eradicated from Campbell Island, and all the islands are nature preserves and recently became World Heritage Sites. Cats and pigs need to be removed from the Auckland Islands, the fisheries need to be worked with and the ocean temperature fluctuations need to be studied to help this species survive.[2]

Footnotes

  1. ^ . Retrieved 19 November 2021.
  2. ^ a b c d e f g h i j k l m n o BirdLife International (2008)
  3. ^ "Loons, penguins, petrels". International Ornithological Congress. Retrieved 2015-01-14.
  4. ^ "Antipodean albatross | Toroa | New Zealand Birds Online". nzbirdsonline.org.nz. Retrieved 2023-11-26.
  5. ^ Gotch, A. F. (1995)
  6. ^ Robertson, C. J. R. (2003)
  7. ^ Clements, J. (2007)
  8. ^ Remsen Jr., J. V. (2009)
  9. ^ Robertson, C. J. R. & Nunn, G. B. (1998)
  10. ^ Brooke, M. (2004)

References

External links