La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Survey of breeding passerines in the Risoux forest (French Jura Range): present statement and development over 50 years. (2015)
Auteurs :	Alain Joveniaux, Auteur
Type de document :	Article
Dans :	Alauda (83(4) 2015)
Article en page(s) :	285-306
Résumé :	The Risoux forest (about 1250 m a.s.l.) constitutes an original woodland by its subalpine feature and its biogeographical location within the Jura Range, very close to the border with Switzerland. Passerines were censused over 3,300ha in 2010-14 combining IPA (n = 30) and census plot (22ha). The total number of passerine species was of 45 (mean richness of 35.6 species per year). The global density of passerines reaches 63 pairs/ 10ha. The abundance of species linked to coniferous trees is striking. The comparison with data and densities collected previously in 1964-66 shows the following development: increasing number of breeding species, increasing densities and biomass, a more regular repartition of species according to their biomass. The arrival of species linked to mixed lowland woodlands which were previously absent confirms that several species now occur at higher elevations. Owing to the stability of woodland habitats, most of the changes may be related to increasing mean winter and annual temperatures by 2.5 degrees C - 3 degrees C measured over 50 years.

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