Dutch Birding jaargang 28 nummer 5, 2006

Voorplaat / front cover

0 Geelbrauwgors / Yellow-browed Bunting Emberiza chrysophrys, Happy Island, China, 6 mei 2005
(Ran Schols)

Artikelen / papers

273 Siberische Sprinkhaanzangers in Noord-Holland in september 2002-05
C S (Kees) Roselaar, Arnoud B van den Berg, André J van Loon & Erik Maassen

Pallas\'s Grasshopper Warblers in Noord-Holland in September 2002-05

On 21 September 2002, 27 September 2002, 12 September 2003 and 20 September 2005, first-year Pallas\'s Grasshopper Warblers Locustella certhiola were trapped and ringed at Castricum, Noord-Holland, the Netherlands. On 30 September 2004, one was trapped and ringed 17 km to the south at Bloemendaal, Noord-Holland. These were the second to sixth records for the Netherlands and also for the coastal Kennemerland region of Noord-Holland. The only previous record concerned a first-year trapped on 5 October 1991, also at Castricum. There are 57-59 records in western Europe up to and including 2005. Two-thirds were in Norway and Shetland, and date between 10 September and 12 October; there are two August records for France and Germany. Based on photographs and biometrics, the bird of 2004 closely resembled the subspecies L c certhiola from western Siberia (like the one on Utsira, Norway, the same day). The birds of 1991, 21 September 2002, 2003 and 2005 closely resembled each other; they were slightly heavier streaked above than the Bloemendaal bird of 2004 but are still best considered as certhiola. The bird of 27 September 2002 was even less distinctly streaked than the Bloemendaal bird of 2004 and closely agreed with the subspecies L c centralasiae from eastern Kazakhstan, Xinjiang and Mongolia. Diagnoses of the subspecies, based on breeding birds examined and on literature, are presented. After examination of the type specimen of certhiola in Berlin, Germany, centralasiae, certhiola, rubescens and minor are used as names for the subspecies, following Sushkin (1925) and Cheng (1987), rather than centralasiae, sparsimstriata, rubescens and certhiola for the same taxa in the same order, as done by Meise (1934) and Stepanyan (2003). The subspecies centralasiae, certhiola and rubescens grade into each other where they meet, but the subspecies minor is markedly smaller than the three others (wing male 61-67 mm, female 58-63, against male 66-74 and female 63-69 in skins of the others), is said to have a different voice (Stegmann 1929) and may overlap locally with rubescens in breeding range, and thus may form a separate species. However, it apparently grades into certhiola in south-eastern Transbaikalia, eastern Mongolia and the neighbouring part of northern Inner Mongolia, as birds from these areas combine the pale ground colour of minor with the moderate dark streaking of certhiola and have an intermediate size.

C S (Kees) Roselaar, Zoölogisch Museum, Universiteit van Amsterdam, Postbus 94766, 1090 GT Amsterdam, Nederland
( roselaar\"\"science.uva.nl)
Arnoud B van den Berg, Duinlustparkweg 98, 2082 EG Santpoort-Zuid, Nederland
(arnoud.vandenberg\"\"planet.nl)
André J van Loon, Kastelenstraat 45-2, 1083 CB Amsterdam, Nederland
(loon-gavia\"\"planet.nl)
Erik Maassen, Wijk aan Zeeërweg 180, 1972 NW IJmuiden, Nederland
(erik.maassen\"\"zonnet.nl)

284 Steenortolaan bij Castricum in oktober 2004
C S (Kees) Roselaar & Vrs Castricum

Grey-necked Bunting at Castricum in October 2004

On 16 October 2004, a Grey-necked Bunting Emberiza buchanani landed on the grounds of the bird ringing station at Castricum, Noord-Holland, the Netherlands, lured by a call of Yellowhammer E citrinella played near the clap nets. It was trapped, ringed and measured. In the next hour, descriptions, videos and photographs were taken, and the bird was sound-recorded at release. From its plumage, it was identified as a first-year male, separable from males of Ortolan Bunting E hortulana and Cretzschmar\'s Bunting E caesia of similar age by the relatively long tail, relatively long and slender-based all-pink bill, black-and-rufous pattern on the tertials (without the so-called \'Emberiza pattern\' with sharply-cornered hook), black-and-white pattern of the outermost tail-feather (no black of outer web invading white wedge on inner web), presence of pink feather-centres on throat and breast (no yellow on throat, no grey on breast), and call. Photographs were compared with specimens from the breeding grounds in the collections of the zoological museums of Amsterdam and Leiden (Netherlands), Berlin (Germany), and Tring (England) and with descriptions made in the museum of Bonn (Germany), proving that the bird perfectly matched the subspecies E b neobscura, breeding from the Mugodzhary Plateau in western Kazakhstan east to Mongolia. This subspecies is characterized by predominantly greyish olive-brown upperparts patterned with narrow but fairly pronounced black streaking on lower mantle and scapulars, lacking the rufous borders along the less clearly defined dark shaft-streaks on mantle and scapulars shown by the subspecies E b cerrutii from eastern Turkey, Transcaucasia, western and northern Iran, and south-western Turkmenistan. The Castricum bird was the fifth and westernmost record for Europe, earlier observations being restricted to two birds recorded at Orenburg (south-eastern European Russia) before 1900 and more recent ones at Snake Island (Ostrov Zmeinyy), Black Sea, Ukraine, on 25 May 1983 and near Ufa, western Urals, Bashkortostan, Russia, on 15 June 2003. The species may breed in the Orenburg and Ufa regions, as these are close to the known breeding area on the Mugodzhary Plateau.

C S (Kees) Roselaar, Zoölogisch Museum, Universiteit van Amsterdam, Postbus 94766, 1090 GT Amsterdam, Nederland
(roselaar\"\"science.uva.nl)
Vrs Castricum, p/a Bergstraat 31, 1931 EN Egmond aan Zee, Nederland
(vinkenbaan\"\"vwgcastricum.nl)

292 Sperweruil bij Westerbork in oktober 2005
Peter van Wetter, Eric Jan Alblas & Gert Ottens

Northern Hawk Owl at Westerbork in October 2005

On 30-31 October 2005, a Northern Hawk Owl Surnia ulula was observed in a coniferous forest near Westerbork, Drenthe, the Netherlands. It was identified as a first-winter on basis of the pointed, broad white tips to the longest tail-feathers, poorly marked tertials and the fact that all visible primaries and secondaries appeared of the same age. On the basis of the pale-coloured crown and upperparts, the Nearctic subspecies S u caparoch (which has been recorded in Britain and the Canary Islands) and the Central Asian S u tianschanica can be excluded. The bird therefore belongs to the nominate subspecies S u ulula, which breeds in the northern parts of Scandinavia and Russia. The European population is estimated at a minimum of 9200 pairs. The species is renowned for its pronounced invasions into southern parts of its breeding range, and sometimes beyond. These movements are induced by a lack of prey (and/or a good previous breeding season). One of the largest invasions was in the winter of 1983-84 when many 100s were found in southern Denmark, Norway and Sweden, and even in Germany and in Shetland, Scotland. The bird at Westerbork was also part of a (smaller) invasion, which was most apparent in Finland (171 birds up to 31 December 2005), Sweden (at least 65), Estonia (14) and Denmark (at least three). The southernmost (and latest) record during the 2005-06 invasion concerned a bird in Brandenburg, Germany, from 19 February until 23 March 2006. The bird at Westerbork was accepted as the third for the Netherlands and the first to be seen by numerous observers. Previous records concern one collected in Utrecht on 5 October 1920 and one photographed by a single observer in Limburg on 2 April 1995.

Peter van Wetter, Brandgans 11, 7827 LD Emmen, Nederland
(p.wetter\"\"wxs.nl)
Eric Jan Alblas, Beukenlaan 8, 9603 DA Hoogezand, Nederland
(ej.alblas\"\"kpnplanet.nl)
Gert Ottens, Ganzebloem 14, 3984 CG Odijk, Netherlands
(glanskraai\"\"hotmail.com)

297 Bulwer’s Petrels in the Mediterranean and risk of confusion with nightjars
Ricard Gutiérrez
299 Afwijkende Blauwe Reiger bij Capelle aan den IJssel in juli-augustus 2006
Enno B Ebels & Willem van Rijswijk

Aberrant Grey Heron near Capelle aan den IJssel in July-August 2006

From 22 July into August 2006, an aberrant first-year Grey Heron Ardea cinerea stayed for c two weeks at Capelle aan den IJssel, Zuid-Holland, the Netherlands. It was much darker in plumage than a normal Grey Heron and had a strongly decurved bill. This combination gave the impression of a hybrid Grey Heron x Glossy Ibis Plegadis falcinellus but this is a most unlikely hybrid type that has not (yet) been documented. More likely, it was a rare combination of an aberrant plumage and bill deformation. There have been previous records of unusually dark Grey Herons but not in combination with a deformed bill. The combination of deformed bill and melanism is sometimes observed in other species, such as (domesticated) Mallard Anas platyrynchos.

Enno B Ebels, Joseph Haydnlaan 4, 3533 AE Utrecht, Nederland
(ebels\"\"wxs.nl)
Willem van Rijswijk, Schalkeroord 315, 3079 WG Rotterdam, Nederland
(wsvanrijswijk\"\"tiscali.nl)

301 Long-billed Curlew at Riohacha, Colombia, in March 2006
A (Bert) de Bruin
302 Perzische Roodborst bij Pietersbierum in oktober 2005
Ulbe Rijpma & Adri Bakker

White-throated Robin at Pietersbierum in October 2005

On 31 October 2005, a first-winter White-throated Robin Irania gutturalis was trapped and ringed at Roptazijl, Pietersbierum, Friesland, Netherlands. It was identified by the black tail, largely grey upperparts and head, dirty-white underparts with breast slightly mottled dark, and the very pale orange tinge on flank, axillaries and underwing-coverts. The age was established by the obvious pale tips to the juvenile tertials, greater coverts, primary coverts and alula feathers. Based on tarsus length, it was probably a female. The bird was found dead only two days later, probably as a window victim, c 300 m from the ringing site. This is the fourth for the Netherlands with previous records on 3-4 November 1986, 2 June 1995 and 30 August 2003.

Ulbe Rijpma & Adri Bakker, Sexbierumerweg 47a, 8802 PK Franeker, Nederland
(bakkerdejong\"\"home.nl)

304 Basra Reed Warblers in Iran in May 2004, with notes on vocalization
Raffael Ayé

Trends in systematics

306 Dark science: cryptic speciation in Common Raven?
Jan Hein van Steenis

Aankondigingen & verzoeken

308 Turkey Bird Report 2002-06; The Sound Approach to birding
??

DBA nieuws

309 Goed doorgeven van waarnemingen; Afscheid Klaas Haas als vogellijn-beheerder; Programma Dutch Birding-vogelweek 2006 op Texel
??

CDNA mededelingen

310 Recente CDNA-besluiten
??

Masters of mystery

311 Solutions of fourth round 2006: Lesser Black-backed Gull and Red-necked Nightjar; Fifth round 2006
Rob S A van Bemmelen, Dick Groenendijk & Ruud G M Altenburg

WP reports

316 late July-early September 2006
Arnoud B van den Berg & Marcel Haas

Recente meldingen / recent reports

326 Nederland: juli-augustus 2006
Ruud M van Dongen, Remco Hofland & Peter W W de Rouw
336 België: juli-augustus 2006
Gerald Driessens

DB actueel

339 Woestijnplevieren te IJmuiden en Eemshaven [Greater Sand Plovers]; Kortbekzeekoet in Belgisch binnenland [Brünnich’s Murre]; Izabeltapuit in Eemshaven [Isabelline Wheatear]; Daurische Klauwier op Maasvlakte [Daurian Shrike]
??
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