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Titre :	Report on scarce migrant birds in Britain in 2004-2007 Part I: non-passerines
Auteurs :	Peter A. Fraser, Auteur
Type de document :	Article
Dans :	British Birds (106(7) JUL 2013)
Article en page(s) :	368-404
Résumé :	This report presents data on scarce migrant birds in Britain between 2004 and 2007. Sixteen of the 17 species removed from the BBRC list at the end of 2005 are included here for the first time (Ferruginous Duck Aythya nyroca was treated in this report from 1995 to 1998), while 'Black Brant' Branta bernicla nigricans also makes its first appearance here. Some species appeared in record numbers during this four-year period, while others fared poorly. The long-term trends for several species, in particular waders and several passerines that breed in Europe, show a gradual decline, whereas Nearctic waterfowl and waders, together with passerines from Siberia, are generally increasing. Species doing particularly well included Green-winged Teal Anas carolinensis, which posted totals ranking highest, third-equal, seventh and eighth highest since 1958, while good years for Great White Egret Ardea alba, Black Kite Milvus migrans, American Golden Plover Pluvialis dominica and White-rumped Sandpiper Calidris fuscicollis all seem to fully justify the decision to remove these species from the BBRC list. Yellow-browed Warbler Phylloscopus inornatus remains the most numerous species in this report, with over 3,500 individuals recorded in the review period, and the highest, second- and fifth-highest totals ever; other passerines doing well included Greenish Warbler R trochiloides and Red-rumped Swallow Cecropis daurica, two more of the species removed from the BBRC list at the end of 2005. At the opposite end of the scale, some species fared especially poorly. In particular, there were no records of Tawny Pipit Anthus campestris in 2007, the first such statistic for any species in this report in its current format. Numbers of Ferruginous Ducks, Red-footed Falcons Falco vespertinus, Red-throated Pipits Anthus cervinus and Rustic Buntings Emberiza rustica also fell, taking these species back within the parameters of national rarities, while the Aquatic Warbler Acrocephalus paludicola is also approaching this level. Many species in this report have now been monitored for 40-50 years, making this a robust and valuable dataset for investigating long-term changes in populations, distribution and movements. Assessment by county or regional committees ensures the rigour of the data; 96% of the records presented here have been assessed and published in the relevant bird reports.

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