Bibliothèque Tour du Valat

Se connecter

Mot de passe oublié ?
Pas encore inscrit ?

La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Détail

Ajouter au panier

Ajouter au panier

Lien vers la notice

Titre :	Ornithological studies in a strict forest reserve and a managed forest before and after a storm
Auteurs :	Frank Hohlfeld, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (127(1) 2006)
Article en page(s) :	51-64
Résumé :	The 'Bechtaler Wald' oak hornbeam forest in the upper Rhine valley was heavily affected by the gale 'Lothar' in December 1999. About 80% of the trees were uprooted. Bird densities were surveyed in spring and the results from a strict forest reserve and a managed forest were compared. The survey was started in 1994, repeated in 1999 previous to the storm and continued in 2000 and 2001. Bird densities, nesting cavities and cavity trees were recorded. In 1994 and 2002, forest structure and composition were recorded using a sampling method; these data have been used for interpretation of the ornithological data. Before the storm, bird diversity and species composition were very similar in the two forest types. Cavity-nesting birds reached higher densities in the strict forest reserve because they used the higher amount of dead wood (snags) and damaged trees for breeding and foraging. After the gale, bird communities of the compared areas evolved differently. The not cleared strict forest reserve had higher bird densities than the cleared forest. In the cleared forest, species composition was found to have changed more than in the strict forest reserve. The differences in the density of cavity-nesting birds between the strict forest reserve and the managed forest increased. Tree species was found to be less important than tree consistency for cavity-nesting birds. Snags and damaged trees became more important for cavity-nesting birds in the strict forest reserve. They were found to breed even in fallen dead tree sterns. Only in the strict forest reserve uplifted tree roots and fallen tree crowns created important nesting habitats for several bird species. Most bird species settled in the forest both before as well as after the storm. Some characteristic forest species disappeared and some species of open land occurred especially in the cleared parts of the managed forest. At these places the managed forest changed temporarily into open grassland with scattered trees. The strict forest reserve remained a forest covered predominantly by trees, either standing or lying on the ground.

FAQ

Infos pratiques

Heures d'ouverture et contact

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...

Liens utiles

A-
A
A+