La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Fifty years of wintering waterbird census in Wallonia and Brussels (Belgium)
Auteurs :	Jean-Paul Jacob, Auteur ; Jean-Yves Paquet, Auteur ; Koen Devos, Auteur ; Thierry Onkelinx, Auteur
Type de document :	Article
Dans :	Aves (50(4) DEC 2013)
Article en page(s) :	195-220
Résumé :	Waterbirds are censused every winter for 50 years in Wallonia and Brussels (Southern Belgium). This waterbird count is the oldest bird monitoring program in Belgium. In earlier time, it was limited to the mid-January count, but more recently, it evolved to a monthly count at least on the major waterbird sites (from November to February) and it was complemented by night roost counts for cormorants and gulls.These counts have witnessed considerable changes in waterbird wintering populations, most of the time in the direction of a large increase of the population. Great Crested Grebe, Great Cormorant, Gadwall, Tufted Duck..., all rare species back in the Sixties, are now common and present on many wintering sites. However, more recently, the population trends of most species has been fluctuant or even negative, especially in the last decade.

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