La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Analysis of the probable causes of recent changes in birds of Wallonia
Auteurs :	Jean-Paul Ledant, Auteur
Type de document :	Article
Dans :	Aves (51(1) MAR 2014)
Article en page(s) :	27-41
Résumé :	A method analysing causes of changes in breeding bird populations is proposed and applied to the avifauna of Wallonia. The approach consists in estimating the number of species whose population trend is supposed to be affected by a given process. This number is then used as an indicator of the importance of that process. The underlying hypothesis is that the availability of breeding habitats or the size of the pre-breeding populations may limit the breeding populations and therefore play an exclusive role in the observed trends. Results suggest that changes in habitat availability explain the population trends of more than one third of the species. A second major factor seems to be the decrease in culling. The analysis also highlights the importance of external factors and of delays between causes and effects.

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