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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The status and distribution of summering Greylag Geese Anser anser in Scotland, 2008-09 (2011)
Auteurs :	Carl Mitchell, Auteur ; Larry Griffin, Auteur ; Mark Trinder, Auteur ; Julia Newth, Auteur ; Christine Urquhart, Auteur
Type de document :	Article
Dans :	Bird Study (58(3) 2011)
Article en page(s) :	338-348
Résumé :	Capsule Summering Greylag Geese Anser anser are increasing in number and expanding their range in Scotland. Aims During the summers of 2008 and 2009, extensive surveys of Greylag Geese in Scotland were undertaken to update the current distribution and population estimates, as well as estimate breeding success. Methods Checks of known moult-sites were combined with a random stratified sample of lochs to the south and east of the Great Glen (the 're-established population' area). Sample lochs were selected on the basis of altitude, the proportional areas of woodland and water cover and previous summer records of Greylag Geese within the 10-km squares in which the lochs were located. To the north and west of the Great Glen (the 'northwest Scotland' population area), comprehensive post-breeding counts of feeding areas were undertaken in late August. Results Combined results from 2008 and 2009 suggest an estimated 47 405 (range 44 059-51 763) Greylag Geese in Scotland. Since 1989, Greylag Geese encountered to the south and east of the Great Glen (derived from re-established birds) have increased at an annual rate of about 9.7% per annum and, since 1997, those in northwest Scotland have increased at an annual rate of about 11.7% per annum. It is estimated that the total number of Greylag Geese summering in Britain is about 84 500 birds. In 2008, overall breeding success was 24.1% young in the late summer population, which probably more than compensates for natural and shooting mortality. Conclusion There is no indication of a decline in the rate of increase of Greylag Geese in Scotland and the species is expected to continue to increase in abundance and distribution.

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