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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Population size and differential population growth of introduced Greater Canada Geese Branta canadensis and re-established Greylag Geese Anser anser across habitats in Great Britain in the year 2000 (2007)
Auteurs :	Graham E. Austin, Auteur ; Mark M. Rehfisch, Auteur ; John R. Allan, Auteur ; Steve J. Holloway, Auteur
Type de document :	Article
Dans :	Bird Study (54 MAR 2007)
Article en page(s) :	343-352
Résumé :	Capsule Both populations are increasing at a similar rate. Aims During 2000, an extensive survey of introduced Greater Canada Geese and re-established Greylag Geese in Great Britain was undertaken in order to update population estimates lost made between 1988 and 1991. Methods A randomized stratified sample of 1329 of the 61 510 tetrads (2 km x 2 km unit) in Great Britain was surveyed. The habitat categories, or strata, were based on the proportion of water cover, urbanization, and upland/lowland in each tetrad. Non-urbanized strata were further divided into northern and southern reporting areas. Results In 2000 there were an estimated 88 866 full-grown Greater Canada Geese and 24 522 full-grown Greylag Geese in Great Britain. Since the 1988-91 survey, Greater Canada Geese have increased by 166% and Greylag Geese by 170%, an average per annum rate of increase of 9.3% for Greater Canada Geese and 9.4% for Greylag Geese. The increase in Greater Canada Goose numbers since the 1988-91 survey has occurred mainly in habitats which had previously held low goose population densities, particularly the 'no water' lowland habitat. Although densities were still relatively low in this habitat (

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