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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Pied Avocet conservation in Denmark - breeding conditions and proposed conservation measures
Auteurs :	Ole Thorup, Auteur ; Thomas Bregnballe, Auteur
Type de document :	Article
Dans :	Dansk Ornitologisk Forenings Tidsskrift (109(3) 2015)
Article en page(s) :	134-144
Langues:	Anglais
Résumé :	Although numbers of breeding Pied Avocets in Denmark increased between the 1920s and the early 1990s, they are now declining significantly more rapidly than in almost all other NW European countries. There have been few studies of the causes of the declines in breeding colonies in Denmark, and here we analyse some case studies and overall trends in predation and weather patterns to try and assess the importance of selected potential factors affecting breeding numbers. Western Denmark lies on the very north-western edge of the Pied Avocet breeding distribution, and breeders here are therefore most likely to be more vulnerable to reductions in reproduction rates as a result of severe weather events, such as strong winds and heavy precipitation, especially during the chick rearing period. Increased risk of flooding of low-lying coasts and islands, a general increase in abundance of the most significant predators, such as red fox Vulpes vulpes and Peregrine Falcon Falco peregrinus, and disturbance by human visitors are other likely factors, which may contribute to declines in Pied Avocet breeding numbers in Denmark over the last 20 years. Finally, we provide some management recommendations, which could potentially reverse the present negative trend.

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