Rybák australský

Jak číst taxoboxRybák australský
alternativní popis obrázku chybí
Stupeň ohrožení podle IUCN
zranitelný
zranitelný[1]
Vědecká klasifikace
Říšeživočichové (Animalia)
Kmenstrunatci (Chordata)
Podkmenobratlovci (Vertebrata)
Třídaptáci (Aves)
Podtřídaletci (Neoghathae)
Řáddlouhokřídlí (Charadriiformes)
Čeleďrackovití (Laridae)
Rodrybák (Sternula)
Binomické jméno
Sternula nereis
Gould, 1843
Synonyma
  • Sterna nereis
Některá data mohou pocházet z datové položky.
Sternula nereis

Rybák australský (Sternula nereis) je malý australský druh rybáka z rodu Sternula.

Popis

Rybák australský se podobá ostatním malým rybákům rodu Sternula, zvláště rybáku malému. Liší se od něj světlejší spodinou těla, chybějící černou páskou mezi okem a kořenem zobáku a jednobarevně oranžovým zobákem. Dospělí ptáci v prostém šatu a mladí ptáci jsou prakticky nerozlišitelní.[2]

Rozšíření

Hnízdí v několika poddruzích v australské oblasti:

Převážně stálí, některé populace táhnou na západ.[2] Novozélandský poddruh S. n. davisae byl kriticky ohrožený, v roce 1983 poklesla jeho populace na pouhé tři páry. Od té doby se však díky ochranářským zásahům stabilizovala nebo mírně vzrůstá, v roce 1998 činila 25–30 ptáků. Celková populace druhu se odhaduje na 9 000 jedinců.[3]

Reference

  1. The IUCN Red List of Threatened Species 2021.3. 9. prosince 2021. Dostupné online. [cit. 2021-12-27].
  2. a b HARRISON, P. Seabirds: an identification guide. Londýn: Christopher Helm, 1989. ISBN 0-7136-3510-X. 
  3. BIRDLIFE INTERNATIONAL. IUCN Red List of Threatened Species: Sterna nereis [online]. 2008 [cit. 2009-02-15]. Dostupné online. 

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