White tern

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White tern
White tern (Gygis alba candida) Rarotonga.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Charadriiformes
Family: Laridae
Genus: Gygis
Species:
G. alba
Binomial name
Gygis alba
(Sparrman, 1786)
Gygis alba map.svg

The white tern or common white tern (Gygis alba) is a small seabird found across the tropical oceans of the world. [2] It is sometimes known as the fairy tern, although this name is potentially confusing as it is also the common name of Sternula nereis . Other names for the species include angel tern and white noddy in English, and manu-o-Kū in Hawaiian. The little white tern ( Gygis microrhyncha ), previously considered a subspecies of the white tern (Gygis alba microrhyncha), is now recognised as a separate species. [3]

Contents

Taxonomy

The white tern was first formally described by the Swedish naturalist Anders Sparrman in 1786 under the binomial name Sterna alba. [4] The genus Gygis was introduced by the German zoologist Johann Georg Wagler in 1832. [5] The name Gygis is from the Ancient Greek guges for a mythical bird and the specific alba is Latin for "white". [6]

Molecular phylogenetic studies have shown that the white tern is more closely related to the noddies than it is to the other terns. [7] This implies that "white noddy" would be a more appropriate English name. [8]

The white tern has the following recognized subspecies:

Some authors have postulated that there may be three species of Gygis:Gygis alba, in the Atlantic Ocean, and Gygis candida and Gygis microrhyncha, both in the Pacific. [12]

Description

The white tern has a wingspan of 76–87 cm (30–34 in). [13] It has white plumage and a long black bill. [14] Nesting on coral islands, usually on trees with small branches but also on rocky ledges and on man-made structures, the white tern feeds on small fish which it catches by plunge diving. Giant tortoises have been observed to hunt the bird on Fregate Island in the Seychelles. [15]

Distribution and habitat

The white tern ranges widely across the Pacific Ocean from the coasts of Chile and Colombia to New Zealand and along the eastern and southern coasts of Asia from China to India, South Maldives, the islands of the Indian Ocean, and the coast of South Africa. [1] Rarely it is also found in Japan, Madagascar, Mexico, and on some islands in the Atlantic Ocean. It is a pelagic and epipelagic bird, living along the coast and moving into wooded areas during the breeding season.

Behavior

This species is notable for laying its egg on bare thin branches in a small fork or depression without a nest. This behaviour is unusual for terns, which generally nest on the ground, and even the related tree-nesting black noddy constructs a nest. It is thought that the reason for the absence of nests is the reduction in nest parasites, which in some colonial seabirds can cause the abandonment of an entire colony. [16] In spite of these benefits there are costs associated with tree nesting, as the eggs and chicks are vulnerable to becoming dislodged by heavy winds. For this reason the white tern is also quick to relay should it lose the egg. The newly hatched chicks have well developed feet with which to hang on to their precarious nesting site. It is a long-lived bird, having been recorded living for 42 [17] years.

Relationship with humans

The white tern, manu-o-Kū, was named Honolulu, Hawaiʻi's official bird on April 2, 2007.

New Zealand's Department of Conservation classifies the white tern as Nationally Critical, with populations having been largely decimated by the introduction of feral cats and rats on Raoul Island, the terns' only breeding site in the country. [18] As of 2016, the white tern population in New Zealand was reported to be increasing following the eradication of introduced predators in 2002. [18] [19] Globally, the white tern has a large range that is home to several large colonies, and both recognised species are listed as Least Concern by the IUCN Red List.

Related Research Articles

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

Terns are seabirds in the family Laridae, subfamily Sterninae, that have a worldwide distribution and are normally found near the sea, rivers, or wetlands. Terns are treated in eleven genera in a subgroup of the family Laridae, which also includes several genera of gulls and the skimmers (Rynchops). They are slender, lightly built birds with long, forked tails, narrow wings, long bills, and relatively short legs. Most species are pale grey above and white below with a contrasting black cap to the head, but the marsh terns, the black-bellied tern, the Inca tern, and some noddies have dark body plumage for at least part of the year. The sexes are identical in appearance, but young birds are readily distinguishable from adults. Terns have a non-breeding plumage, which usually involves a white forehead and much-reduced black cap.

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

Fantails are small insectivorous songbirds of the genus Rhipidura in the family Rhipiduridae, native to Australasia, Southeast Asia and the Indian subcontinent. Most of the species are about 15 to 18 cm long, specialist aerial feeders, and named as "fantails", but the Australian willie wagtail is a little larger, and, though still an expert hunter of insects on the wing, concentrates equally on terrestrial prey.

<span class="mw-page-title-main">Royal tern</span> Species of bird

The royal tern is a tern in the family Laridae. The species is endemic to the Americas, though vagrants have been identified in Europe.

<span class="mw-page-title-main">Sooty tern</span> Species of bird

The sooty tern is a seabird in the family Laridae. It is a bird of the tropical oceans, returning to land only to breed on islands throughout the equatorial zone.

<span class="mw-page-title-main">Greater crested tern</span> Seabird in the family Laridae

The greater crested tern, also called crested tern, swift tern, or great crested tern, is a tern in the family Laridae that nests in dense colonies on coastlines and islands in the tropical and subtropical Old World. Its five subspecies breed in the area from South Africa around the Indian Ocean to the central Pacific and Australia, all populations dispersing widely from the breeding range after nesting. This large tern is closely related to the royal and lesser crested terns, but can be distinguished by its size and bill colour.

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

The black-legged kittiwake is a seabird species in the gull family Laridae. This species was first described by Carl Linnaeus in his landmark 1758 10th edition of Systema Naturae as Larus tridactylus. The English name is derived from its call, a shrill 'kittee-wa-aaake, kitte-wa-aaake'. In North America, this species is known as the black-legged kittiwake to differentiate it from the red-legged kittiwake, but in Europe, where it is the only member of the genus, it is often known just as kittiwake.

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

The black noddy, also known as white-capped noddy, is a species of tern in the family Laridae. It is a medium-sized seabird with black plumage and a white cap that closely resembles the lesser noddy with which it was at one time considered conspecific. The black noddy has slightly darker plumage and dark rather than pale lores.

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

The paradise flycatchers (Terpsiphone) are a genus of birds in the family Monarchidae. The genus ranges across Africa and Asia, as well as a number of islands. A few species are migratory, but the majority are resident. The most telling characteristic of the genus is the long tail streamers of the males of many species. In addition to the long tails the males and females are sexually dimorphic and have rufous, black and white plumage.

<span class="mw-page-title-main">Great frigatebird</span> Species of bird (Fregata minor)

The great frigatebird is a large seabird in the frigatebird family. There are major nesting populations in the tropical Pacific Ocean, such as Hawaii and the Galápagos Islands; in the Indian Ocean, colonies can be found in the Seychelles and Mauritius, and there is a tiny population in the South Atlantic, mostly on and around St. Helena and Boatswain Bird Island.

<span class="mw-page-title-main">Lesser vasa parrot</span> Species of bird

The lesser vasa parrot or black parrot is a black coloured parrot endemic to most of Madagascar. It is one of four species of vasa parrots, the others being the greater vasa parrot, the Seychelles black parrot, and the Comoros black parrot. The latter two were formerly considered conspecific with the lesser vasa parrot.

<span class="mw-page-title-main">Brown noddy</span> Species of bird

The brown noddy or common noddy is a seabird in the family Laridae. The largest of the noddies, it can be told from the closely related black noddy by its larger size and plumage, which is dark brown rather than black. The brown noddy is a tropical seabird with a worldwide distribution, ranging from Hawaii to the Tuamotu Archipelago and Australia in the Pacific Ocean, from the Red Sea to the Seychelles and Australia in the Indian Ocean and in the Caribbean to Tristan da Cunha in the Atlantic Ocean. The brown noddy is colonial, usually nesting on elevated situations on cliffs or in short trees or shrubs. It only occasionally nests on the ground. A single egg is laid by the female of a pair each breeding season. In India, the brown noddy is protected in the PM Sayeed Marine Birds Conservation Reserve.

<span class="mw-page-title-main">Antarctic tern</span> Species of bird

The Antarctic tern is a seabird in the family Laridae. It ranges throughout the southern oceans and is found on small islands around Antarctica as well as on the shores of the mainland. Its diet consists primarily of small fish and crustaceans. It is very similar in appearance to the closely related Arctic tern, but it is stockier, and it is in its breeding plumage in the southern summer, when the Arctic tern has shed old feathers to get its non-breeding plumage. The Antarctic tern does not migrate like the Arctic tern does, but it can still be found on a very large range. This tern species is actually more closely related to the South American tern.

<i>Gygis</i> Species of bird

White terns comprise the two species of terns in the genus Gygis. The best known species in the genus is the common white tern. The little white tern, previously considered a subspecies of the white tern, is now recognised as a second species of white tern.

<span class="mw-page-title-main">Fairy tern</span> Species of bird

The fairy tern is a small tern which is native to the southwestern Pacific. It is listed as "Vulnerable" by the IUCN and the New Zealand subspecies is "Critically Endangered". Fairy terns live in colonies along the coastlines and estuaries of Australia, New Zealand, and New Caledonia, feeding largely on small, epipelagic schooling fishes, breeding in areas close to their feeding sites. They have a monogamous mating system, forming breeding pairs in which they mate, nest, and care for offspring.

<span class="mw-page-title-main">Little white tern</span> Species of seabird

The little white tern is a small seabird found in French Polynesia and the Republic of Kiribati. This species was previously considered a subspecies of the white tern, but is now recognised as a separate species.

The little white tern is a small seabird found in Pacific Ocean. This species was previously considered as the white tern, but is now recognised as a separate species.

References

  1. 1 2 BirdLife International (2018). "Gygis alba". IUCN Red List of Threatened Species . 2018: e.T22694821A132576063. doi: 10.2305/IUCN.UK.2018-2.RLTS.T22694821A132576063.en . Retrieved 12 November 2021.
  2. "Common White Tern (Gygis alba) - BirdLife species factsheet". datazone.birdlife.org. Retrieved 2021-05-04.
  3. del Hoyo, J; Collar, N.J.; Christie, D.A.; Elliott, A.; Fishpool, L.D.C. (2014). HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Barcelona, Spain and Cambridge, UK.: Lynx Edicions BirdLife International.
  4. Sparrman, Anders (1786–1789). Museum Carlsonianum, in quo novas et selectas aves, coloribus ad vivum brevique descriptiones illustratas (in Latin). Vol. fasc. 1. Holmiae: Ex Typographia Regia. Plate 11.
  5. Wagler, Johann Georg (1832). "Neue Cippen und Gattugen der Caugthiere und Vögel". Isis von Oken (in German and Latin). Column 1223.
  6. Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. pp. 37, 182. ISBN   978-1-4081-2501-4.
  7. Baker, A.J.; Pereira, S.L.; Paton, T.A. (2007). "Phylogenetic relationships and divergence times of Charadriiformes genera: multigene evidence for the Cretaceous origin of at least 14 clades of shorebirds". Biology Letters. 3 (2): 205–209. doi:10.1098/rsbl.2006.0606. PMC   2375939 . PMID   17284401.Baker, Allan J; Pereira, Sérgio L; Paton, Tara A (2008). "Erratum: Phylogenetic relationships and divergence times of Charadriiformes genera: multigene evidence for the Cretaceous origin of at least 14 clades of shorebirds". Biology Letters. 4: 762–763. doi: 10.1098/rsbl.2006.0606erratum .
  8. Gill, Frank; Donsker, David, eds. (2019). "Noddies, gulls, terns, auks". World Bird List Version 9.2. International Ornithologists' Union. Retrieved 24 June 2019.
  9. "Gygis alba alba (Common White-Tern (Atlantic)) - Avibase". avibase.bsc-eoc.org. Retrieved 2021-05-04.
  10. "Gygis alba candida (Common White-Tern (Pacific)) - Avibase". avibase.bsc-eoc.org. Retrieved 2021-05-04.
  11. "Gygis alba leucopes (Common White-Tern (leucopes)) - Avibase". avibase.bsc-eoc.org. Retrieved 2021-05-04.
  12. Pratt, H. Douglas (22 June 2020). "Species limits and English names in the genus Gygis (Laridae)". Bulletin of the British Ornithologists' Club. 140 (2): 195–208. doi: 10.25226/bboc.v140i2.2020.a10 .
  13. Gochfeld, M.; Burger, J.; Christie, D.A.; Kirwan, G.M. "Common White Tern (Gygis alba)". In del Hoyo, J.; Elliott, A.; Sargatal, J.; Christie, D.A.; de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions. Retrieved 16 April 2017.
  14. Niethammer, K. R., and L. B. Patrick-Castilaw. 1998. White Tern (Gygis alba). in The Birds of North America, No. 371 (A. Poole and F. Gill, eds.). The Birds of North America, Inc., Philadelphia, PA. doi : 10.2173/bna.371
  15. Zora, Anna; Gerlach, Justin (2021-08-23). "Giant tortoises hunt and consume birds". Current Biology. 31 (16): R989–R990. Bibcode:2021CBio...31.R989Z. doi: 10.1016/j.cub.2021.06.088 . ISSN   0960-9822. PMID   34428417.
  16. Houston, D.C. (1978). "Why do fairy terns Gygis alba not build nests?". Ibis. 121 (1): 102–104. doi:10.1111/j.1474-919X.1979.tb05023.x.
  17. Hawaii’s Comprehensive Wildlife Conservation Strategy October 1, 2005
  18. 1 2 Island invasives : eradication and management : proceedings of the International Conference on Island Invasives. C. R. Veitch, Michael N. Clout, D. R. Towns, International Union for Conservation of Nature and Natural Resources. Species Survival Commission, Centre for Biodiversity & Biosecurity. Gland, Switzerland: IUCN. 2011. ISBN   978-2-8317-1291-8. OCLC   770307954.{{cite book}}: CS1 maint: others (link)
  19. Robertson, Hugh A. (2017). Conservation status of New Zealand birds, 2016. Karen Baird, J. E. Dowding, Graeme Elliott, Rod Hitchmough, Colin Miskelly, Nikki McArthur. Wellington, New Zealand. ISBN   978-1-988514-23-9. OCLC   993614035.{{cite book}}: CS1 maint: location missing publisher (link)

Further reading