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Difference between revisions of "Pomarine Jaeger" - BirdForum Opus

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;Stercorarius pomarinus
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[[Image:Pomskua 121107 0118.jpg|thumb|550px|right|Photo © by {{user|postcardcv|postcardcv}} <br />Salthouse, Norfolk, [[England]], November 2007]]
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[[Image:Pomarine_Jaeger.jpg|thumb|550px|right|Photo by tcollins <br/>Photographed at darwin NT Aust]]
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'''Alternative Name: Pomarine Skua'''
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;[[:Category:Stercorarius|Stercorarius]] pomarinus
 
==Identification==
 
==Identification==
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Also known as Pomarine Skua.
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53cm including 8cm tail projection of broad twisted streamers<br />
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[[Image:Pomarine_Skua.jpg|thumb|350px|right|Dark phased<br />Photo © by {{user|IanF|IanF}} North Gare, Seaton Carew, Cleveland, [[UK]], November 2007]]
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45cm length, excluding the central tail feathers of the summer adult, which can add another 10cm or so. It is similar to the [[Arctic Skua]].  It has a brown back, white underparts, dark primary wing feathers which have a white flash. Its head and neck are yellow-white.  It has a black cap. Juveniles have paler underparts, head and neck.
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'''Pale Adult'''
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*Black cap
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*Dark upper parts
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*White underneath with brown breast band and flank bars
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*White flash on outer wing
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'''Dark Adult''' all dusky-brown body<br />
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'''Juveniles''' and '''immature''' variably mottled buff/brown
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====Similar Species====
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* [[Arctic Skua]]
 
==Distribution==
 
==Distribution==
 
Far north of Eurasia and [[North America]]. It is a migrant, wintering at sea in the tropical oceans.
 
Far north of Eurasia and [[North America]]. It is a migrant, wintering at sea in the tropical oceans.
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==Taxonomy==
 
==Taxonomy==
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The Pomarine Skua, known as Pomarine Jaeger in North America, is a seabird in the skua family Stercorariidae. Its relationships are not fully resolved; its mitochondrial DNA is most similar to the Great Skua [Blechschmidt et al., 1993], but from morphology and behavior, it is closer to the lesser skuas (such as the Arctic Skua). The most likely explanation is extensive hybridization between the Great and one species of lesser Skuas, which resulted in a hybrid population that eventually evolved into a distinct species, the Pomarine Skua; or alternatively between the Pomarine and a species of Southern Hemisphere skua, with the Great Skua being the hybrid offspring, perhaps appearing as recently as the 15th century [Blechschmidt et al., 1993; Furness and Hamer, 2003]. Judging from characteristics of the skeleton and behavior, the former seems more likely, as the Pomarine Skua shares several similarities with the "Catharacta" Skuas, while the Great Skua does not seem much different from its Southern Hemisphere relatives.
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This is a [[Dictionary_M-O#M|monotypic]] species<sup>[[#References|[1]]]</sup>.
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[[Image:Spatelraubm we 7.jpg|thumb|350px|right|First year bird<br />Photo © by {{user|storensten|storensten}}<br />Oberkirch, [[Switzerland]], December 2010]]
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The mtDNA difference between the Pomarine and the Great Skua is one of the smallest between any two vertebrate species yet analyzed, being less than the variation found between different individuals of wide-spread species. The apparent capability for hybridization has led to the abolition of the separate genus Catharacta for the Southern Hemisphere and Great Skuas.
 
  
 
==Habitat==
 
==Habitat==
 
It nests on arctic tundra and islands
 
It nests on arctic tundra and islands
 
==Behaviour==
 
==Behaviour==
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====Breeding====
 
It lays 2-3 olive-brown eggs in grass lined depressions.  
 
It lays 2-3 olive-brown eggs in grass lined depressions.  
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====Diet====
 
Its diet includes lemmings and other rodents on the breeding grounds.  
 
Its diet includes lemmings and other rodents on the breeding grounds.  
  
 
It will also kill birds up to the size of Common Gull.
 
It will also kill birds up to the size of Common Gull.
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==Bird Song==
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====Vocalisation====
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<flashmp3>Stercorarius pomarinus (song).mp3</flashmp3><br />
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{{ Audio|Stercorarius pomarinus (song).mp3 }}
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''[[Media:Stercorarius pomarinus (song).mp3|Listen in an external program]]''
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==References==
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#{{Ref-Clements6thDec10}}#Wikipedia
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#Birdwatchers Pocket Guide ISBN 1-85732-804-3
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#Collins Pocket Guide to British Birds 1966
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#Collins Field Guid 5th Edition
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{{ref}}
 
==External Links==
 
==External Links==
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{{GSearch|Stercorarius+pomarinus}}
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{{GSearch|"Stercorarius pomarinus" {{!}} "Pomarine Skua" {{!}} "Pomarine Jaeger" }}
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*[http://www.aviceda.org/abid/birdimages.php?action=birdspecies&fid=41&bid=519 View more images of this species on the ABID]
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{{GS-checked}}1
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*[http://www.orientalbirdimages.org/birdimages.php?action=birdspecies&Bird_ID=936&Bird_Image_ID=4529&Bird_Family_ID=102 View more images of this species on Orientalbirdimages]
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<br />
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[[Category:Birds]]
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<br />
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[[Category:Birds]] [[Category:Stercorarius]] [[Category:Bird Songs]]

Latest revision as of 09:45, 11 May 2023

Photo © by postcardcv
Salthouse, Norfolk, England, November 2007

Alternative Name: Pomarine Skua

Stercorarius pomarinus

Identification

53cm including 8cm tail projection of broad twisted streamers

Dark phased
Photo © by IanF North Gare, Seaton Carew, Cleveland, UK, November 2007

Pale Adult

  • Black cap
  • Dark upper parts
  • White underneath with brown breast band and flank bars
  • White flash on outer wing

Dark Adult all dusky-brown body
Juveniles and immature variably mottled buff/brown

Similar Species

Distribution

Far north of Eurasia and North America. It is a migrant, wintering at sea in the tropical oceans.

Taxonomy

This is a monotypic species[1].

First year bird
Photo © by storensten
Oberkirch, Switzerland, December 2010

Habitat

It nests on arctic tundra and islands

Behaviour

Breeding

It lays 2-3 olive-brown eggs in grass lined depressions.

Diet

Its diet includes lemmings and other rodents on the breeding grounds.

It will also kill birds up to the size of Common Gull.

Vocalisation

References

  1. Clements, JF. 2010. The Clements Checklist of Birds of the World. 6th ed., with updates to December 2010. Ithaca: Cornell Univ. Press. ISBN 978-0801445019. Spreadsheet available at http://www.birds.cornell.edu/clementschecklist/Clements%206.5.xls/view
  2. Wikipedia
  3. Birdwatchers Pocket Guide ISBN 1-85732-804-3
  4. Collins Pocket Guide to British Birds 1966
  5. Collins Field Guid 5th Edition

Recommended Citation

External Links

GSearch checked for 2020 platform.1

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