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Titre :	Sir Richard Graham and the marking of ducks at Netherby, Cumberland, 1908–1933 – an early bird-ringing project (2020)
Auteurs :	Robin M. Sellers, Auteur ; Jeremy J. D. Greenwood, Auteur
Type de document :	Article
Dans :	Ringing & Migration (33(2) July, 2018)
Article en page(s) :	86-93
Résumé :	To increase the variety of game available on his estate at Netherby, near Carlisle, Sir Richard Graham began in 1890 to develop extensive facilities for the captive breeding of wild ducks. Large numbers of birds were involved, 8000–10 000 Mallard Anas platyrhynchos being reared annually in the peak years around 1900, and thousands of Eurasian Teal A. crecca a decade or so later. One of the innovations that Graham and his keeper W. Bell made was to fit some of the birds with metal rings, creating one of the first British projects to take advantage of the then-novel technique of bird ringing. A little over 2000 birds, mainly Eurasian Teal but including also some Gadwall Mareca strepera, Eurasian Wigeon M. penelope, Mallard, Northern Pintail A. acuta, and Common Snipe Gallinago gallinago were marked between 1908 and 1933. Initially some privately produced rings showing only the year of ringing were used (c1000 birds): between 1930 and 1932, privately produced but serially numbered rings were used (c300 birds); and at other times rings issued by the British Birds Marking Scheme were used (c800 birds). In total, 103 ring recoveries from birds marked in these various ways have been identified. Although most were from birds that had been part of Graham’s captive-breeding programme, their movements do not appear to differ markedly from those of fully wild birds. The purpose of marking the birds, the effectiveness of the various types of rings used and the overall contribution of the project to early studies of bird migration are briefly discussed.
En ligne :	https://doi.org/10.1080/03078698.2018.1629151

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