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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Breeding-birds in Douglas Fir and European Silver Fir stands of Southwest Germany - comparison of an alien and an indigenous conifer tree species
Auteurs :	Jochen Mueller, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (136(1) 2016)
Article en page(s) :	43-52
Résumé :	In 2014 and 2015, breeding bird surveys were carried out in four Douglas Fir Pseudotsuga menziesii woodlands (17.2 ha in total) and four European Silver Fir Abies alba woodlands (collectively 15 ha) of Gaggenau municipal forest, Baden-Wurttemberg, Germany. Forests of similar age and size and with low structural diversity were chosen to allow for a comparison between the different forest types. Breeding bird density of different forest bird guilds was assessed. Species inhabiting tree tops were assessed in comparison with species specialized on searching tree trunks for food ("true tree birds"). Moreover, ground birds were compared with scrub-nesting birds ("forest structure indicators"). In both cases Douglas Fir stands were found to support slightly lower abundances of these functional species groups, overall 78 % of territories and 72 % of the recording frequency in comparison to European Silver Fir stands. Absence of Great Spotted Woodpecker in Douglas Fir woodlands was confirmed by a targeted search for hollow trees. Different results were obtained by other studies. Some other comparative studies between Douglas Fir and European Silver Fir as well as between Douglas Fir and European Spruce found higher bird abundances for Douglas Fir woodlands, although it has to be considered that the Douglas Fir stands were structurally quite different (more deciduous understory and forest roads, different slope exposition). A further comparative study between Douglas Fir and European Spruce reported lower abundance values in the respective Douglas Fir woodland. Generally, results indicate a rather similar breeding bird community across Douglas Fir, European Silver Fir and European Spruce habitats. It is suggested that the observed differences are rather a result of structural differences between the investigated woodland patches than an effect of the tree species.

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