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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Population density and habitat use of the Green Woodpecker Picus viridis in Donau-Auen National Park (Lower Austria) (2010)
Auteurs :	Stefanie Riemer, Auteur ; Christian H. Schulze, Auteur ; Georg Frank, Auteur
Type de document :	Article
Dans :	Vogelwarte (48(3) AUG 2010)
Article en page(s) :	275-282
Langues:	Allemand
Résumé :	Population densities and habitat use of the Green Woodpecker Picus viridis were studied in a 1,170 ha study area in the Donau-Auen National Park (Lower Austria). Territory mapping (three visits) between February and April 2008 yielded a minimum of 14 territories, which corresponds to 0.12 territories/10 ha. Based on the incidence of the species in 400 m x 400 m grids, generalized linear models were constructed and the presence of the species was related to dominant tree species, tree age, length of the forest boundary and length of river sidearms. The best predictor for the presence of P viridis was the length of the forest boundary. Most territories were located in areas protected from flooding by a dyke. Hardwood forest was significantly preferred to softwood forest. This can be explained by a better food supply (ants) in drier areas. No significant preferences for particular tree species were found; however, hybrid poplars and willows were apparently avoided, which can be attributed to less favourable conditions in wetter habitats. All territories were located at the forest's edges and contained meadows or agricultural fields. In five territories, agricultural fields seemed to constitute the only open land.

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