Habitat characteristics of brood-rearing sites of hazel grouse Bonasa bonasia in the Eastern Alps (Friuli-Venezia Giulia, Italy)
1995
Franceschi, P.F. de (Museo Civico di Storia Naturale, Verona (Italy)) | Bottazzo, M.
The structure and the vegetational composition of 25 summer habitats used by female Hazel Grouse and their broods in the breeding season were analysed in the Carnic Alps (from Central Carnia to the Tarvisio Forest). Comparison were made between the vegetational characteristics collected in small sample areas (100 square m) where broods were found in summer, and in 25 randomly selected control sites. Hazel Grouse females with broods settled in uneven-aged mixed woods of spruce, fir, larch and beech belonging to the Anemone-Fagetum association. The overstory density was 358 trees ha** (-1)(considering 0 more than 12.5 cm a.b.h.), with only 233 trees ha** (-1) (excluding those with 0 less than 17.5 cm a.b.h.). The mean frequency of the number of tree and shrub species was higher within the brood rearing sites (BRS) than in the contral sites (CS). The main differences between some forestry variables connected with the forest successional stages and forest management in the BRS and in the CS are discussed
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