Hellenica World

Sterna albifrons

Sterna albifrons , Photo: Michael Lahanas

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Classis: Aves
Subclassis: Carinatae
Infraclassis: Neornithes
Parvclassis: Neognathae
Ordo: Charadriiformes
Subordo: Lari
Subordo: Lari
Familia: Sternidae
Species: Sterna albifrons
Subspecies: S. a. albifrons - S. a. guineae - S. a. innominata - S. a. placens - S. a. pusilla - S. a. sinensis

Name

Sterna albifrons Pallas, 1764

Vernacular names
Internationalization
Български: Белочела рибарка
Deutsch: Zwergseeschwalbe
Ελληνικά: Νανογλάρονο (Ευρωπαϊκό)
English: Little Tern
Français: Sterne naine
한국어: 쇠제비갈매기
Lietuvių: Mažoji žuvėdra
Nederlands: Dwergstern
‪Norsk (bokmål)‬: Dvergterne
Polski: Rybitwa białoczelna
Slovenčina: Rybár malý
Suomi: Pikkutiira
Svenska: Småtärna

The Little Tern, Sternula albifrons or Sterna albifrons, is a seabird of the tern family Sternidae. It was formerly placed into the genus Sterna, which now is restricted to the large white terns (Bridge et al., 2005). The former North American (S. a. antillarum) and Red Sea S. a. saundersi subspecies are now considered to be separate species, the Least Tern (Sternula antillarum) and Saunders's Tern (Sternula saundersi).

This bird breeds on the coasts and inland waterways of temperate and tropical Europe and Asia. It is strongly migratory, wintering in the subtropical and tropical oceans as far south as South Africa and Australia.

There are three subspecies, the nominate albifrons occurring in Europe to North Africa and western Asia; guineae of western and central Africa; and sinensis of East Asia and the north and east coasts of Australia (Higgins and Davies, 1996).

The Little Tern breeds in colonies on gravel or shingle coasts and islands. It lays two to four eggs on the ground. Like all white terns, it is defensive of its nest and young and will attack intruders.

Like most other white terns, the Little Tern feeds by plunge-diving for fish, usually from saline environments. The offering of fish by the male to the female is part of the courtship display.

This is a small tern, 21–25 cm long with a 41–47 cm wingspan. It is not likely to be confused with other species, apart from Fairy Tern and Saunders's Tern, because of its size and white forehead in breeding plumage. Its thin sharp bill is yellow with a black tip and its legs are also yellow. In winter, the forehead is more extensively white, the bill is black and the legs duller. The call is a loud and distinctive creaking noise.

Little Tern on European rivers

At the beginning of the 19th century the Little Tern was a common bird of European shores, rivers and wetlands, but in the 20th century populations of coastal areas decreased because of habitat loss, pollution and human disturbance.

The loss of inland populations has been even more severe, since due to dams, river regulation and sediment extraction it has lost most of its former habitats. The Little Tern population has declined or become extinct in many European countries, and former breeding places on large rivers like the Danube, Elbe and Rhine ceased. Nowadays, only few river systems in Europe possess suitable habitats; the Loire/Allier in France, the Vistula/Odra in Poland, the Po/Ticino in Italy, the Daugava in Latvia, the Nemunas in Lithuania, the Sava in Croatia and the Drava in Hungary and Croatia. The status of the Little Tern on the rivers Tagus and lower Danube is uncertain.

The Drava population is one of the most threatened. Old fashioned water management practices, including river regulation and sediment extraction, endanger the remaining pairs. Only 15 pairs still breed on extensive sand or gravel banks along the border between Hungary and Croatia. The WWF and its partners are involved in working for the protection of this bird and this unique European river ecosystem. The Little Tern is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.

References

* BirdLife International (2004). Sterna albifrons. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 11 May 2006. Database entry includes justification for why this species is of least concern
* Bridge, E. S.; Jones, A. W. & Baker, A. J. (2005): A phylogenetic framework for the terns (Sternini) inferred from mtDNA sequences: implications for taxonomy and plumage evolution. Molecular Phylogenetics and Evolution 35: 459–469. PDF fulltext
* Collinson, M. (2006). Splitting headaches? Recent taxonomic changes affecting the British and Western Palaearctic lists. British Birds 99(6): 306-323.
* Harrison, Peter (1988): Seabirds (2nd edition). Christopher Helm, London ISBN 0-7470-1410-8.
* Olsen, Klaus Malling & Larsson, Hans (1995): Terns of Europe and North America. Christopher Helm, London. ISBN 0-7136-4056-1
* Little Tern

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