onsdag den 11. februar 2015

Hybrid or not - Yellowhammer with red on throat

The Yellowhammer in the four photos below was seen by Jannik Andersen on May 24th 2014 in a private garden on Maglebjergvej just north of Helsinge in Denmark. The big question is whether its head and throat pattern is within normal variation of pure Yellowhammer or whether it could indicate a hybrid origin with genetic influence from Pine Bunting. According to the paper on hybridization between Yellowhammer and Pine Bunting in Russia the latter should be the case.

For other similar individuals please have a look at these apparent hybrids from Finland with this one form March 23rd 2012 at Hanko Bird Observatory wich has been accepted as hybrid by the Finnish RC and this other Finnish individual here and here which most likely has been photographed on 31st December 2006 in Kristiinankaupunki. However, this one has not been reported to the Finnish RC, but based on the photographs Aleksi Lehikoinen comments that it should most likely be accepted as another Yellowhammer x Pine Bunting hybrid.

Additionally, there is this recent individual from Sweden: here and here.

Yellowhammer can have some red brown in their head pattern such as seen in this male form Denmark, this male from June 7th 2011 in Leicestershire, England and this male from April 7th 2012 in Lancashire, England which all have some bright red in their submoustacial stripe.

May 24, 2014. (C) Jannik Andersen
May 24, 2014. (C) Jannik Andersen
May 24, 2014. (C) Jannik Andersen
May 24, 2014. (C) Jannik Andersen

torsdag den 1. januar 2015

A 'non-yellow' female Yellowhammer on Læsø

While searching for Pine Bunting on the very last day of December 2014, I found this 'non-yellow' female Yellowhammer. It was seen feeding together with some 70 Yellowhammers and large numbers of other species which were having a feast on cow food at a local farm on the island Læsø in northern Denmark.

First winter female Pine Bunting and Yellowhammer can appear virtually identical in pattern and coloration, although most Yellowhammers show a variable amount of yellow at least on the central belly, crown and supercilium (Pine lacks all yellow). The main problem can be separating female Pine from 'non-yellow' female Yellowhammers (some 'non-yellow' female Yellowhammers can be even more similar to Pine than the type in the photos below).

Some of the useful differences between females of Pine Bunting and those of 'non-yellow' Yellowhammer seem to be as follows:

Flight feather fringes: White or whitish-buff on Pine, never with any yellowish pigment as on most Yellowhammers. Note that the female in the photos below has narrow yellow fringes to flight feathers.

Crown streaks and supercilium: Streaks are more restricted to the lateral crown on Pine, with far fewer on the central crown (can appear as a paler crown-stripe). Yellowhammer normally (not always) shows a more evenly streaked crown and narrower supercilium. Pine shows striking contrast between lateral part of crown and paler whitish and almost un-streaked supercilium, though sometimes with very thin faint streaks, whereas Yellowhammer shows less contrast owing to its greyer supercilium.

Note this individual from Tarsiger or this one for reference.


fredag den 26. december 2014

Hvidrygget Ryle, ad. sdr., 31.5.2007, Vidåslusen

I forbindelse med oprydningen på harddisken, dukker der ikke kun fund frem fra i år, men også ældre fund af sjældne fugle jeg endnu ikke har vist her på bloggen. Her er den en super flot Hvidrygget Ryle, der i perioden 25.-31. maj 2007 kunne ses bl.a. på forlandet lige syd for Vidåslusen, hvor nedenstående billeder er taget. Men den sås også på vaden i den nordligste del af Saltvandssøen, hvor jeg i forbindelse med feltarbejde sammen med Rasmus Due Nielsen havde mulighed for at se den. En super flot fugl, der gjorde sig godt i det tidlige morgenlys sammen med Kærløbere og Islandske Ryler.

Fundet figurer på DK Listen med følgende info: 2007-05-25 -(05-31) : 1 ad. summ. plum. Margrethe Kog og Vidåslusen, SJ

Kærløber

Hvidvinget Terne, 2 trk. 17.5.2014, Gjerrild Nordstrand

I forlængelse af indlægget fra forgårs, så fortsættes hermed med endnu nogle dokumentationsbilleder, der pga. et arbejdstungt år først nu graves frem fra harddisken. De to billeder dokumenterer den ene af de to Hvidvingede Terner i sommerdragt, der trak mod vest ved Gjerrild Nordstrand den 17. maj 2014. De to fugle kom kl. 10.30 daskende langs kysten 50 m ude og fouragerede kortvarigt flere steder langs kysten under trækket.

Jeg havde netop forladt kontoret ved Gjerrild Nordstrand Øst, men da Jørgen Staarup Christensen var hurtig til at ringe, så lykkedes det at se den ene fugl trækkende langs kysten længere mod vest. Den anden fugl har utvivlsomt også været der, men klitrækken var ret høj ud for det sted jeg stod, hvorfor jeg kun kunne se den ene. Det hele gik meget hurtigt, hvorfor jeg kun lige akkurat formåede at tage et par billeder inden den ene fugl var under klitterne igen for aldrig at blive set mere. De var således trukket videre. Hele morgenen havde vi fået meldinger om Hvidvingede Terne fra det meste af landet, hvorfor man kan sige, at de var ventet. Men ikke desto mindre fedt at se arten ved Gjerrild.


Fuglen ses øverst til højre i billedet.

tirsdag den 23. december 2014

Islom, ad. trk., 16.5.2014, Gjerrild Nordstrand

Julefreden er ved at sænke sig over familien og der er blevet lidt tid til at sortere og rydde op i årets mange billeder. Herved dukker oplevelser frem fra harddisken og vækker mindre fra eksempelvis forårsmorgener på Gjerrild. Nogen tid inden de andre mødte ind på kontoret ved den nye lokalitet, Gjerrild Nordstrand Øst, som Alex Sand Frich genopdagede for et par år siden og som siden har fast mødested om foråret, trak en adult Islom i sommerdragt forbi mod nordvest. Det var den 16. maj 2014 og klokken var kun 05.04 og solen var således endnu ikke stået op. Det manglende lys er medvirkende til, at billederne kræver en vis grad af fantasi for at kunne anvendes som dokumentation af fundet.

Fuglen kom trækkende lavt over havet fra øst i retning mod nordvest og var på et tidspunkt kun nogle få hundrede meter ude. Den sås rigtig fint først i håndkikkert og dernæst teleskop, hvorefter kameraet blev flået op ad tasken.






mandag den 15. december 2014

Could this winter Redstart be an Ehrenberg's?

The intriguing 1cy male Common Redstart was still present today on December 15, 2014 along the south side of Vesteroe Harbour on Laesoe in Denmark. The bird shows some features (pale wing panel and whitish washed feather tips to the underparts) that may indicate the subspecies P. p. samamisicus (Ehrenberg's Redstart). However identification of this race in 1cy plumage is still in its infancy and unfortunately the bird has not been heard calling. Several faecal samples have been collected today as faecal samples from a target species can contain epithelial cells from its digestive tract walls and I thus hope to have these samples tested for DNA.


søndag den 14. december 2014

Vinterforekomst af 1K han Rødstjert på Læsø

Da jeg her til eftermiddag stak hovedet op over molen på Vesterø Havn på Læsø for at tage et kig ned ad stranden, nåede jeg lige akkurat at se et glimt af en mulig smådrossel, der forsvandt rundt om en dynge store sten. Den havde tilsyneladende fourageret i opskyl på stranden imellem en stak meget store granitsten, og alene habitat og årstiden gjorde, at jeg inden fuglen var i kikkerten første gang nåede at tænke Husrødstjert som default.

Med de efterhånden mange meldinger om østlige Husrødstjerte i vores nabolande, luskede jeg straks efter den for at tjekke den mere grundigt. Herefter fik jeg et kort glimt af en rustfarvet underside og mørk strube inden den endnu engang forsvandt, hvorfor jeg straks var tændt. Fluks tilbage til bilen efter teleskop og videokamera, og heldigvis viste den sig frem til trods for en kold pålandsvind, så jeg ret hurtigt kunne verificere bestemmelsen til ung Rødstjert han.

Det var således en meget sjælden december forekomst af en art, der for længst skulle være i tropisk Afrika, fremfor en ny race for landet som en phoenicuroides Husrødstjert ville have været. Lars Tom-Petersen fandt i januar 2012 en han ved Sødringholm, som formentlig var første vinterfund i Skandinavien, hvorfor dagens fund kunne være blot det andet fund nogensinde? Men jeg havde nu ønsket, at det var en rødmavet Husrødstjert.

Dagens fugl havde tydelig indskæring på yderfanen af P3, P4 og P5 (gule streger) som en Rødstjert. Bemærk desuden, at afstanden mellem P5 og P6 er stort set identisk med afstanden mellem P6 og P7 igen som hos en Rødstjert (røde streger på billedet). Hybrider har iflg. litteraturen en vingeformel, der mere minder om en Husrødstjerts blot med manglende indskæring på P6.

Alle billeder og video taget i dag den 14. december 2014 på sydsiden af Vesterø Havn på Læsø.

torsdag den 4. december 2014

European Robin (Erithacus rubecula) with abnormal winter song


This European Robin (Erithacus rubecula) was heard singing in its winter territory on October 22, 2014 at 07.25 a.m. Note that the song is somewhat reminiscent of Willow Warbler.

mandag den 29. september 2014

Sunday Sooty Sunday

Igennem årene er det blevet til rigtig mange timer ved havet i Østjylland, men det var først søndag den 28. september 2014, at jeg fik set min første Sodfarvet Skråpe. En længe ventet art og så oveni købet med to fugle i en stille vind fra vest. Begge fugle trak på mellemdistance mod nord på deres vej ud af Kattegat og kom direkte syd fra, hvorfor de måske har været inde og vende i Aarhus Bugten og måske samtidig er nogle af dem, der er blevet set ved Nordsjælland de seneste dage.



Det var således super fedt, at se rigtig havfugle samtidig med et ret massivt træk af småfugle prægede himlen, hvilket dagens tal vidner om. Se eksempelvis indtastningerne i DOF-Basen her.

Der var også pænt med tre arter kjover, hvor unge Mellemkjover klart dominerede billedet. Alle Mellemkjoverne kom ind fra øst eller sydøst, hvor de tangerede kysten et stykke ud på deres videre vej mod nordvest. Storkjoven sås i retning af Anholt Vindmøllepark, hvor den trak nordvest. Desuden sås en Mallemuk trække nord i samme spor som de to Sodfarvede Skråper.

fredag den 26. september 2014

The two Lesser Whitethroats were both curruca

The result of the genetic analysis on the two possible Siberian Lesser Whitethroats from Feldballe, May 21, 2014 and Anholt, June 1, 2014 confirms that they both had mitochondrial DNA belonging to Sylvia curruca curruca. As the difference in nuclear DNA between curruca and blythi is very little, it is however difficult to exclude a mixed origin. Nevertheless, we can say with confidence that the two birds fall into the curruca clade as defined in the recent paper by Olsson et al (2013) and moreover, say that at least its mother was a nominate curruca.

They were both originally thought to be possible blythi based on their distinct songs. However, when caught their wing formula did not differ significantly from curruca as much as the wing formula on the DNA-confirmed blythi from Anholt, October 20, 2012 did.

Below are some photos of the bird from Feldballe:

Note that the white throat contrasts with the buffy flanks and breast.
It is the bird to the left.
P2 falls between P5 and P6 (almost on level with P6).
Here the wing is compared with the 'Siberian Lesser Whitethroat (Sylvia [curruca] blythi) found on Anholt in october 2012.

torsdag den 26. juni 2014

Atlasprojektet Danmarks Guldsmede


Tilmeld dig nyhedsbreve


mandag den 16. juni 2014

Female Yellowhammer of the more grey type

While searching for Ortolan Bunting on one of my early morning walks on May 2, 2014 this rather grey female Yellowhammer turned up. I took a few record shots on which you can see faint yellowish fringes to the primaries and a yellowish wash in the facial markings along with some yellow on the flanks, but as it was one of the more grey individuals that I have seen it was worth documenting for future reference.


søndag den 15. juni 2014

What about European Curlew (arquata), Oriental Curlew (orientalis) and Steppe Curlew (suschkini)?

Due to gradual changes in plumage and measurements across the distributional of Eurasian Curlew, it is at best very difficult to identify out of range subspecies such as the eastern orientalis race, breeding east of the Urals, and suschkini breeding in steppe regions of southern Russia and Kazakhstan.

Nevertheless, on walking along the southern shore of Anholt on October 5, 2013 I flushed a 1cy Curlew which called for attention due its flashing white axillaries and underwing coverts. I grabbed for my camera and as it made a quick turn and passed nearby me I shoot a series of flight shots.

The bird is surely striking with its white underwing coverts, unmarked white axillaries and sparly marked flanks, but the amount of dark bars and the off-white ground colour to the tail could indicate that it may fit in among western-type birds with the least marked underwing coverts and flanks.

Nominate arquata and orientalis are western and eastern extremes respectively of continuous cline of increasing bill and tarsus length, less heavy marking, and paler ground-colour towards east. No sharp boundary between these extremes. Nominate arquata from western Europe typically have short bill and tarsus, rather broad streaks on upperparts and chest, back and rump usually streaked, belly and uppertail coverts often marked with black blobs, flanks distinctly barred and often with large dark blobs, axillaries barred and often with black subterminal blob, and underwing coverts partly barred or spotted, especially primary coverts.

Typical orientalis from eastern part of range has longer bill and tarsus; narrower and less deep black streaks on upper- and underparts, and flanks and tail coverts less heavily barred and usually lacking black blobs; belly, lower back, upper rump, and underwing almost immaculately white; tail with fewer and narrower bars; axillaries white, a few with thin dusky subterminal shaft-streak at most.

Marks in juveniles of both races relatively narrower, body and axillaries appearing paler; in nominate arquata, bars on axillaries often broken or forming rows of dots only. If trying racial recognition, it is thus important to account for age differences.

With this amount of dark bars and off-white ground colour in the tail, this may just fit in among western-type birds with the least marked underwing coverts and flanks...