La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Wintering diving duck populations in the Oresund, southern Sweden, in relation to available food resources
Auteurs :	L. Nilsson, Auteur
Type de document :	Article
Dans :	Wildfowl (55 2005)
Article en page(s) :	59-73
Langues:	Anglais
Résumé :	Intensive surveys of staging and wintering diving ducks in the Oresund area, southern Sweden, were undertaken during the winters 1995/96, 1996/97 and 1997/98 as a part of the Environmental Impact Assessment (EIA) related to the establishment of a Fixed Link (bridge-tunnel-artificial island) between Sweden and Denmark. Monitoring of the benthic fauna made it possible to compare the calculated food requirements of the diving duck populations with their food resources. Overall, the diving ducks (mainly Tufted Duck Aythya fuligula, Scaup Aythya marila and Goldeneye Bucephala clangula) consumed between 2.6% and 4.6% of the standing crop of suitable food organisms. It is, however, probable that higher proportions of the prey are consumed in the shallowest areas compared to areas with deeper water. A prolonged period of ice cover during one of the study years made a large proportion of the feeding areas unavailable, but the main mussel beds were still free of ice because of strong currents so this had only Limited impact on the food availability for the ducks.

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