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Woodland cover and Tawny Owl Strix aluco density in a Mediterranean urban area
Ranazzi, Lamberto ...
We studied the distribution of the Tawny Owl Strix aluco by assessing territory density in 22 census plots along the urbanisation gradient in urban Rome (central Italy). During the 1998-1999 breeding ...seasons, a total of 194 territories was censused. Population density was low in farmlands (mean +-SD=1.0+-0.5 territories/km2 , n=6 census plots) and developed areas (=1.4 +-0.6 territories/km2, n=7), but increased in urban parks (=3.3 +- 1.0 territories/km2, n=5 and suburban woodlands (=5.7 +- 1.5 territories/km2, n=4), being unaffected by the distance from the city-centre. Conversely, density variations are mainly due to the availability of suitable habitats (i.e. woodlands). Wooded area per territory eas high in farmlands, where territories are scattered owing to the fragmentation of habitat resources, slightly decreasing in suburban woods, where the whole area is occupied. Hence, wood size is a good predictor of the number of territories occupied, as the dependence of the number of territories on wooded area was strictly linear (Y=0.06X + 3.38, r=0.80, P<0.0001, df=20). Maintaining natural vegetation and old trees in large urban parks, preventing summer fires in thermophilous suburban woods, and providing nestboxes in small gardens where suitable natural cavities are not available, are recommended as management tools in order to encourage the continued breeding of tawny owls in urban habitats.
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