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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Selection of roosting trees in Winter by capercaillie Tetrao urogallus from Russia after translocation to the Thuringian slate mountains. (2013)
Auteurs :	Christoph Unger, Auteur ; Siegfried Klaus, Auteur
Type de document :	Article
Dans :	Vogelwarte (51(1) 2013)
Article en page(s) :	39-46
Langues:	Allemand
Résumé :	uring winter (October-April) of 2002 to 2005 roosting trees of Capercaillie (n=91 males, n=29 females) in the Thuringian slate mountains were analysed. In the study area, pine Pinus silvestris was the dominating tree species (67 %,) followed by spruce Picea abies (27 %), larch Larix sudetica (3 %) and fir Abies alba (2 %). Pine was the preferred sleeping tree (83 %) as compared with spruce (10 %). Birds rested 143 (50 to 300) cm apart from the stem at a mean height of 14 (8 to 21) m. Plateau and upper slope habitats (slope 1 ° to 7 °) were preferred for resting (83 %), whereas only 17 % of the sleeping trees were found in the middle slope. 98 % of all resting trees were located near to border lines. Tree canopy closure was significantly lower at resting sites (58 %) as compared with control sites (69 %). A logistic regression model including breast height diameter of the trees, preferred tree species (pine), canopy closure and vicinity to border lines explained 76 % of the selection of resting trees. Avoidance of predators and saving of energy were assumed to determine the selection of sleeping trees. Habitat management should include: early and extended clearing operations to reduce canopy closure to 50-70 %, creation of pine forests and of gap structures.

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