Wyniki wyszukiwania

1

Changes in density and territory size of the Tawny Owl Strix aluco along an altitude gradient: the effect of forest types and wood cover

100%

Salvati L., Ranazzi L.

Acta Zoologica Cracoviensia

|

2002

|

tom 45

|

nr 2

The authors correlated the percentage cover of forested areas with Tawny Owl Strix aluco density and territory size measured in deciduous woodlands along the elevation gradient in central Italy. They calculated the amount of wooded areas per owl territory on the basis of four forest types (urban woods, sclerophyllous woods, mesophilous woods, and montane beech woods). Breeding density differed 3-fold among forest types and suggests that wood quality has a direct effect in determining spatial patterns. The amount of wooded areas per territory is fairly stable in all forest types, and indicates a mean requirement of ca. 10 ha per territory. The smallest territories were in ca. 5 ha sized. Minimum habitat requirement may depend locally on wood quality. Management strategies based on the forest type should be undertaken to protect the local high-density populations of this owl.

2

Wood occupation and area requirement of the Great Spotted Woodpecker Picoides major in Rome [Central Italy]

80%

Salvati L., Manganaro A., Ranazzi L.

Acta Ornithologica

|

2001

|

tom 36

|

nr 1

This study was carried out in Rome city from 1991 to 1999. In a total of 47 urban parks and suburban woods, 22 wooded areas were occupied by Great Spotted Woodpeckers during the breeding period. All woods greater than 50 ha in area were occupied by woodpeckers. On a five year scale, territorial stability was positively correlated with woodland size. The requirement of wooded area per territory was slightly higher in urban parks (6.7 ± 2.7 ha, n = 10 wooded areas) than in suburban woods (5.7 ± 1.3 ha, n = 5), and was negatively correlated to the vegetation cover. The area of woodland per territory in Rome was higher than in neighbouring deciduous oak woods. This suggests that urban habitats are of inferior quality for breeding Great Spotted Woodpeckers, probably owing to features of their vegetation and their isolation from other woodland patches. Maintaining mature stands of natural vegetation with old and dead trees in larger urban parks could be useful to encourage the occurrence of Great Spotted Woodpecker in cities.

3

Notes on the diet successful and failed breeding Tawny Owls [Strix aluco] in urban Rome, Italy

80%

Ranazzi L., Manganaro A., Salvati L.

Acta Zoologica Cracoviensia

|

2001

|

tom 44

|

nr 1

Ograniczanie wyników

2 Acta Zoologica Cracoviensia

1 Acta Ornithologica

3 Ranazzi L.

3 Salvati L.

2 Manganaro A.

1 2002

2 2001

Changes in density and territory size of the Tawny Owl Strix aluco along an altitude gradient: the effect of forest types and wood cover

Wood occupation and area requirement of the Great Spotted Woodpecker Picoides major in Rome [Central Italy]

Notes on the diet successful and failed breeding Tawny Owls [Strix aluco] in urban Rome, Italy