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Buskrørsanger (Acrocephalus dumetorum) Blyth's Reed Warbler -
Sjældenhed: Almindelig
Stemmer kan høres her (eksternt link)
Lokalitet:
Svínoy - Færøerne
2009-10-07
Fotograf: Silas Kristian Krag Olofson - Se profil

Beskrivelse: Denne sanger sås under ½ minut og kunne ikke genfindes trods eftersøgning. SiO

Uploadet 2009-10-07 Publiceret 2009-10-07 Acrocephalus dumetorum Blyth's Reed Warbler
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Kommentarer
Tim Hesselballe Hansen
8. okt. 2009 kl. 21:35
Jeg synes mere, at det ligner en Acro. Hmmm, et lille brunt oktober-job. Jeg må hellere stoppe her, inden det går helt galt...
Thomas Hellesen
8. okt. 2009 kl. 21:41
Havde jeg set den på Stubben havde jeg noteret den som rørs. Underhaledækfjer synes jeg ik' passer på savi og den har efter min mening også lidt for meget øejenbrynsstribe til savi... Mvh Thomas
Rasmus Strack
8. okt. 2009 kl. 22:09
Nej det må jeg medgive, der gik jeg nok fejl i byen. Mvh Rasmus
Silas Kristian Krag Olofson
8. okt. 2009 kl. 22:34
Jeg troede selv i den korte periode jeg så den, at det kunne være en lille gulbug ud fra farverne. Men billederne viser en rundet hale, så dette er udelukket. På grund af den korte obs-tid forblev det en sanger sp i felten. Den kaldte ikke. Spørgsmålet er så om den kan bestemmes ud fra billederne. SiO
Per Kjær
8. okt. 2009 kl. 22:52
Jeg mindes engang at have læst at fuglekiggere i Finland taler om "The locustella stribe". Dermed taler de om at locustella sangere har en lys stribe langs vingeforkanten. Det er ret tydeligt illustreret i Fugle i Felten (stor udgave, side 294). På den nederste del af den lukkede vinge på en locustella ses en lang lys stribe som ser ud til at være skabt af en lys fjerspole på den yderste håndsvingfjer. Såvidt jeg kan se på billederne af fuglen på Færøerne har denne fugl ikke den såkaldte 'locustella stribe'. Og helt generelt synes jeg at underhalefjerene ikke er 'lange' nok til en locustella og at halen ikke er rund 'nok' til at fuglen er en lucustella.
Thomas Hellesen
8. okt. 2009 kl. 23:10
Men hvad med de lyse ben? Taler det ik mest for 1k kærsanger (jf. Svensson), eller er det indenfor den variation der også kan ses hos rørsanger?
Jan Speiermann
9. okt. 2009 kl. 11:06
Jeg synes at den passer meget godt på en kærsanger både mht benfarve, øjenstribe, halelængde og undergump. Jeg vil tro at en savis ville virke mørkere på underhalen end tilfældet er her.
Martinez Jonathan
9. okt. 2009 kl. 15:05
sorry i'm really curious, what the final result of all this conversation? Thanks if anybody have time to resume it shortly!!! Rgds jonathan
Silas Kristian Krag Olofson
9. okt. 2009 kl. 16:40
Hi Jonathan and others! This bird was seen for less than 30 seconds in the field before disappearing. I only managed to get these three pics. There has been some suggestions about the species. First it was thought to be a savi's warbler due to the round tail, pinkish legs and undertail coverts. Doubt was raised on the id and all kind of agree now that it it not a savi's warbler. From personal mails I can tell that some still think it's a locustella, but most think of it as some kind of acro. Reed warbler, marsh warbler, blyth's reed warbler and paddyfield warbler have been suggested. Regards Silas
Martinez Jonathan
9. okt. 2009 kl. 17:52
Hi Silas, Thanks for your explanation. My first feehling was also different from a Savi's that the reason why i was interesting on the comments translation. I also think on Reed or Blyth's , but i would'nt be abble to say more about this bird. Anyway it's a great series for the Faeroe this past week...congratulations for the pictures. Cheers Jonathan
Per Kjær
9. okt. 2009 kl. 22:05
I agree with Jonathan that this bird is not a Savi's. I dont think its even a locustella. I think it's an acrocephalus. I don't think its a paddyfield as the supercilium ends very shortly after the eye. However, I don't think it could be a Blyth's either. To me, the legs are much to pale for the bird to be a Blyth's. Also, of what can be seen of the tertials on the small picture to the left there seems to be a rather strong contrast between the centre and the fringes. Blyth's would have tertials with lesser contrast. The overall colour of the bird looks to me as the colour of a reed warbler. Unfortunately it is not possible to see the bird's full head profile due to the bird is turning its head slightly on the big picture in the middle and the small picture to the right. Therefore it is difficult to see if the bird has the shorter and more stubbern bill that marsh warblers have compared to reed warblers. So the closest I can get to an Id of this bird is either reed or marsh. One last thing pointing towards reed is the fact that marsh warblers migrate quite early in the autumn. On Christiansø the latest date of observation in the autumn is the 20th of september and the median date for the latest observation is the 6th of september (from 20 years of observations).
Martinez Jonathan
11. okt. 2009 kl. 05:05
Hi Per, Thanks for this heavy detailed ID. cheers, Jonathan
Silas Kristian Krag Olofson
27. jan. 2010 kl. 12:36
This bird has been renamed to blyth's reed warbler, but with doubt concerning the id. The bird has been assesed by the danish RC and they agree that the bird looks like a blyth's reed warbler, but crucial features in wing structures are not sufficiently visible on the pictures.
Silas Kristian Krag Olofson
11. jun. 2010 kl. 11:51
I received these comments from James Gilroy some time ago: To me, your acro definitely has the look and feel of a Blyth's Reed. The colour tones look spot on - it has that characteristic warm brown but slightly olivey tone to the upperparts, particularly the wing and crown. The overall structure seems ok - short bill, long tail, slim feel etc.. The primary projection looks rather long on the first pic, but not outside the range of Blyth's given the angle. The second pic (bird facing away) is the key - the primary projection and wing point look exactly as I'd expect for a Blyth's Reed - short with very limited spacing between the outer primaries. The huge emargination visible on P3 seems very far up the wing (too far up for Reed), and there looks to be a hint of emargination on P4. If only that bit of wire wasn't in the way! I'm sure if the wire wasn't there the P4 emargination would be obvious! What's visible of the face pattern also looks good for Blyth's - nice neat creamy supercilluim.

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