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Documents disponibles écrits par cet auteur (8)
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Article
George Sangster, Auteur ; J. Martin Collinson, Auteur ; Andreas J. Helbig, Auteur ; Alan G. Knox, Auteur ; David T. Parkin, Auteur
Article
Hadoram Shirihai, Auteur ; Gabriel Gargallo, Auteur ; Andreas J. Helbig, Auteur ; Alan Harris, Auteur ; David Cottridge, AuteurA major new book on the warblers of the genus Sylvia (Shirihai et al 2001) will treat the taxonomy and identification of this intriguing group of passerines in greater depth than has ever been attempted before. Here, we present a shortened adapt[...]
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Martin Collinson, Auteur ; David T. Parkin, Auteur ; Alan G. Knox, Auteur ; George Songster, Auteur ; Andreas J. Helbig, AuteurAs part of its reassessment of the taxonomy of birds on the British List, the BOURC Taxonomic Sub-committee has assessed all six recognised taxa of scoters Melanitta against its previously published Species Guidelines (Helbig et al. 2002). We co[...]
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Klemens Puetz, Auteur ; Carsten Rahbek, Auteur ; Pertti Saurola, Auteur ; Kjeld T. Pedersen, Auteur ; Risto Juvaste, Auteur ; Andreas J. Helbig, AuteurThe migratory behaviour of two Lesser Black-backed Gull Larus fuscus subspecies, fuscus and intermedius, was studied using satellite telemetry. To this end, first-year birds were equipped with satellite transmitters and released either at their [...]
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George Sangster, Auteur ; J. Martin Collinson, Auteur ; Andreas J. Helbig, Auteur ; Alan G. Knox, Auteur ; David T. Parkin, Auteur
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George Sangster, Auteur ; Martin Collinson, Auteur ; Andreas J. Helbig, Auteur ; Alan G. Knox, Auteur ; David T. Parkin, Auteur ; Tony Prater, AuteurDuring the second half of the twentieth century, Green-winged Teal Anas carolinensis was almost universally treated as a subspecies of 'Common Teal'. Reassessment of morphological and behavioural differences between Green-winged Teal and Eurasia[...]
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Alan G. Knox, Auteur ; Andreas J. Helbig, Auteur ; David T. Parkin, Auteur ; George Sangster, AuteurLesser Redpoll Carduelis cabaret has until recently been widely regarded as a subspecies of Common Redpoll C. flammea. In the past, it was geographically isolated from other redpolls during the breeding season, but expansion of its range since t[...]
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Peter Clement, Auteur ; Andreas J. Helbig, AuteurThe 'chiffchaff complex' within the genus Phylloscopus covers a wide area of Europe and northern Asia, and has often been considered to include a number of good species based on physical and vocal differences. The affinities of certain populatio[...]
