La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Long-term changes in numbers and distribution of wintering ducks and swans in the Moray Firth, Scotland, 1985-2002
Auteurs :	Bozena Kalejta-Summers, Auteur
Type de document :	Article
Dans :	Wildfowl (56 2006)
Article en page(s) :	94-112
Langues:	Anglais
Résumé :	Counts of ducks and swans in the Moray Firth between 1985 and 2002 were analysed to assess changes in their numbers and distributions. The average count for all ducks combined exceeded 20,000 in all winters. Wigeon Anas penelope was the most abundant,platyrhynchos and Teal A. crecca. The majority of species species, followed by Mallard A. peaked in December and January, except Wigeon, which peaked in October. The average winter numbers of Mallard, Wigeon, Tufted Duck Aythya fuligula, Shelduck Tadorna tadorna and Whooper Swan Cygnus cygnus decreased significantly over the 17-year period, whilst those of Teal increased. Decline in numbers was greatest for Whooper Swan and Tufted Duck. For some of the species, trends in abundance reflected the general pattern observed throughout Britain. Adjacent inland lochs supported up to 11% of the overall number of wildfowl in the Moray Firth basin, with Loch Eye having the largest number. The Moray Firth as a whole supported internationally important numbers of Wigeon, Teal, Pintail A. acuta and Whooper Swan. Numbers of Mallard and Mute Swan C. olor were of national importance.

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