Uria aalge

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Uria
Uria aalge aalge
Stato di conservazione
Rischio minimo[1]
Classificazione scientifica
DominioEukaryota
RegnoAnimalia
SottoregnoEumetazoa
SuperphylumDeuterostomia
PhylumChordata
SubphylumVertebrata
SuperclasseTetrapoda
ClasseAves
SottoclasseNeornithes
OrdineCharadriiformes
FamigliaAlcidae
GenereUria
SpecieU. aalge
Nomenclatura binomiale
Uria aalge
(Pontopiddan, 1763)
Sottospecie
  • Uria aalge aalge
  • Uria aalge hyperborea
  • Uria aalge albionis
  • Uria aalge inornata
  • Uria aalge californica
Areale

     Aree di nidificazione

     Stanziale

     Aree di svernamento

L'ùria comune (Uria aalge (Pontopiddan, 1763)) è un uccello della famiglia Alcidae.[2]

Descrizione

Gli adulti raggiungono una lunghezza di 38-46 cm, con un'apertura alare di 61–73 cm.[senza fonte]

Biologia

Uova

Questi uccelli vivono sul mare aperto salvo durante la cova.

I genitori depositano l'uovo direttamente sulla roccia o sulla nuda terra. Covano l'uovo stando in piedi direttamente sulla roccia della scogliera.

L'uovo è piriforme (forma a pera), il che è da mettere in relazione al fatto che l'uria cova direttamente sulla roccia della scogliera e tale forma riduce la possibilità che l'uovo rotoli verso il mare. Le uova sono inoltre di colore diverso, si suppone per facilitarne il riconoscimento.

Distribuzione e habitat

U. aalge aalge, varietà "dalle redini"

Nidificano in affollate colonie su isole, coste rocciose e scogliere in:

Tassonomia

Sono state descritte 5 sottospecie:[2]

  • Uria aalge aalge (Pontoppidan, 1763) - sottospecie nominale diffusa nelle aree costiere di Canada, Islanda, Scozia, Norvegia meridionale e del mar Baltico; una varietà detta "dalle redini" ha un anello bianco attorno all'occhio e una linea bianca che partendo dall'occhio si spinge indietro.
  • Uria aalge hyperborea Salomonsen, 1932 - presente dalla Norvegia settentrionale sino alle Svalbard e alla Russia nord-occidentale
  • Uria aalge albionis Witherby, 1923 - dal colore marrone scuro, con areale che si estende dalle isole Britanniche sino alla penisola iberica
  • Uria aalge inornata Salomonsen, 1932 - presente in Corea, Giappone, mar di Bering, Alaska e Canada sud-occidentale
  • Uria aalge californica (H.Bryant, 1861) - diffusa sulla costa orientale degli Stati Uniti, sino alla California

Note

  1. ^ (EN) BirdLife International 2012, Uria aalge, su IUCN Red List of Threatened Species, Versione 2020.2, IUCN, 2020.
  2. ^ a b (EN) F. Gill e D. Donsker (a cura di), Family Alcidae, in IOC World Bird Names (ver 9.2), International Ornithologists’ Union, 2019. URL consultato il 19 maggio 2014.

Altri progetti

Collegamenti esterni

  • Uria aalge, in Avibase - il database degli uccelli nel mondo, Bird Studies Canada.
Controllo di autoritàLCCN (EN) sh85028997 · GND (DE) 4186335-5 · J9U (EN, HE) 987007543390505171 · NDL (EN, JA) 00576927
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