[ Login ]

ID Forum

xxx

x


,
©



2016-08-09   1
Nikolas Haass


Moin,

Am Sonntag hatten wir diese Seeschwalbe. Ich hatte sie initial als Küstenseeschwalbe bestimmt, bin aber mit dem langen, leicht gebogenen Schnabel, dem vorderlastigen Jizz und dem stark ausgeprägten 'carpal bar' nicht ganz glücklich. Ober- und Unterflügelmuster schließt, denke ich, FlussSS aus (auch die östliche UA). Der scharf begrenzte Handflügelhinterrand (bestehend aus den Spitzen von HS5-10) scheint für KSS zu passen. Ist aber wohl zu viel für White-fronted Tern und Antarctic Tern. Ideen?

Hier sind noch weitere Bilder: www.adarman.com/Pelagics/Queensland-Pelagics/2016-August-07-Southport/

Gruß,

Nikolas

[bearbeitet 2016-08-09]


2016-08-15   2
Nikolas Haass


Alle Australier (Jeff Davies, David Eades, Kevin Bartram und die Beobachter an Bord) sind der Meinung, dass es sich um eine 'langschnäblige' Küstenseeschwalbe handelt. (s. meinen Kommentar im Parallelbeitrag). Weitere Kommentare?

Gruß,

Nikolas


2016-08-18   3
Nikolas Haass


Mein Original-Kommentar: "This bird was ID'd as an Arctic Tern by Gus Daly and myself during the trip and everybody on board agreed. Later when I saw the long drooping bill and the large triangular (but somewhat faded) carpal patch that almost reached the trailing edge on the uncropped photographs, I thought that something was wrong with this bird and thought that it could be a White-fronted Tern. However, of all the possible ID contenders, it looks still best for Arctic, but an odd one. I am still not happy with the long drooping bill, the front-heavy jizz and the large carpal patch. Underwing pattern (sharply defined trailing edge) and upperwing pattern speak against Common Tern. It looks like the sharply defined trailing edge is composed of the tips of P5-P10, which I think is good for Arctic and not good for White-fronted. It's also not right for Subantarctic Tern and other Sterna species can easily be ruled out. So, we on Paul Walbridge's pelagic currently think that it is an odd first summer Arctic Tern. Any thoughts?"

Kevin Bartram: "In some ways odd, but I think that trailing edge is too well-defined and neat to be of anything else. Jizz etc resembles Arctic more than anything as well. Carpal bar fits immature bird."

David Eades: "Apologies for coming to this one late but agree it's a 1st Basic/Alternate Arctic. Carpal bar looking extensive and triangular in one of the photos (2nd crop) is I think just photographic artefact. Ditto the impression of the very long bill which seems to look a bit longer than it really is in those photos where the white forehead is washed out but looks less impressive when the junction of white forehead and basal upper mandible is more clearly visible - it may be a longer-billed example of an Arctic but it ain't so long that I'm thinking it hybridised with a Stilt!"


2018-01-28   4
Nikolas Haass


Kürzlich wurde Zweifel an der Bestimmung geäußert, allerdings ohne Begründung. Was denkt Ihr?