Hej

Det tydliga samt mycket långa ögonbrynsstrecket och ett vingband, om än otydligt, tyder på nordsångare (Phylloscopus borealis) anser jag. Näbben är visserligen mörk liksom benen vilket inte stämmer så bra men jag tror det ligger inom variationen för p.borealis. Näbben ser kraftig ut vilket stämmer med borealis. /Mattias

Att ögonbrynsstrecket dessutom ej når pannan, de ensfärgade tertialern, samt vingformeln, stort gapp mellan hp5 & 6 talar för nordsångare. Att benen ser mörka ut excluderar inte arten.

JanJ

I forhold til mit gængse minde om Nordsanger virker denne fugl mindre, mere ala Lundsanger. Den kan ligne en extremt slidt Two-barred Greenish Warbler (med næsten afslidte vingebånd), men er snarere af en af de "andre" former af norsanger, der findes i Østasien. Borealis er den nordsanger vi kender fra Skandinavien, men de lokale østlige former, samt fugle fra Alaska er lidt mindre med smallere næb og generelt mere grøntonet overside. Dette kunne godt passe på denne fugl. Det meste omkring adskillelsen af de østlige former for Nordsanger er dog formentligt ikke undersøgt nærmere endnu.

Som Klaus nämner borde det rimligen vara någon av de östliga ssp, examinandus (Kamchatka), xsanthodryas (Japan) och kennicotti (Alaska).

Deep phylogeographical divergences among Far Eastern populations of the widespread Arctic Warbler
In contrast to the numerous phylogeographical studies of North American and European birds, very few have been undertaken in far eastern Asia. The Arctic Warbler (Phylloscopus borealis), a migratory passerine with a wide breeding range from Norway to Alaska, is unsettled taxonomically. Three to seven subspecies are usually recognized: borealis from Scandinavia to the Chukotskiy Peninsula, sometimes split into talovka, transbaicalicus and borealis; hylebata in Ussuriland and Sakhalin, although the Ussuri population is sometimes lumped with borealis and the Sakhalin with Japanese xanthodryas); examinandus in Kamchatka, also often lumped with xanthodryas); xanthodryas in Japan; and kennicotti in Alaska. These subspecies are poorly differentiated morphologically, but some have distinctive songs. We analyzed variation in 1011 base-pairs of cytochrome b (cyt b) gene sequence of mitochondrial DNA from breeding populations in Siberia, Alaska, Kamchatka, Sakhalin and Japan (Hokkaido, Honshu, Shikoku and Kyushu). We recovered four clades: clade A from Kamchatka and Hokkaido; clade B from Siberia and Alaska; clade C from Sakhalin; and clade D from Honshu, Shikoku and Kyushu. Genetic distances between the four clades ranged between 2.3% and 5.8%. Assuming substitutional rates 2% per million years in the cyt b gene, the divergence between clades A and D was estimated at approximately three million years, far greater than those among typical subspecies. In contrast, samples of borealis and kennicotti were very similar genetically. We conclude that examinandus and xanthodryas might advisedly be treated as distinct species, because they have been separated from each other and from borealis for a considerable time, probably throughout the Pleistocene.

J Ornithol 147 suppl (2006)

JanJ

Hi all

Thanks a lot for comments on ID, very interesting reading and I always get a lot smarter :o)
It seems that we can conclude that this bird is definitely an Artic warbler (Phylloscopus borealis), and most likely one of the far eastern subspecies.
I still haven’t been able to find descriptions on plumage of these subspecies anywhere, so if anyone has comments on differences in plumage, field ID or where to look for these things, (other than in field ;o) please let me know.

Bw
RBC

Artsnavnet er hermed ændret til Nordsanger.

Mvh Rune (administrator).

Vides der noget om disse formers (lyder som rimeligt oplagte splits) vinterkvarterer? Er de blandet der? Hvad er det man ser på gennemtræk i Thailand og i vinterkvarter i Malaysia og på Sumatra f. eks.?