Avifauna del Comune di Udine

Udine

2008

317 S.

zahlr. Abb., Lit. Ang.

Bandaufführung

152927

This work provides for the first time in a sufficiently detailed form, a synthesis of the current knowledge of the avifauna of Udine at the end of a project of many years supported by the Museo Friulano di Storia Naturale. Udine is the chief town of the province of Udine, one of the four which go to make up the autonomous region of Friuli Venezia Giulia in NE Italy. It Covers 56,81 km2 and has a resident population of almost 100.000 inhabitants. By a preliminary study in 2001, all previous available data were collected and examined and a first list of the species recorded was draft. The field work involved several observers and was carried out in each season from 2002 to 2005, especially during the breeding period and concerned the breeding species for which an atlas was compiled. A Standard recording methods like in other atlases was used. The study area was divided by a regular UTM based grid of 75 Units (U.R.) each of 1 km2. A list of 21 environmental typology recognised on the municipal territory was included on the recording card. A total of 217 species are examined (111 non-Passerines and 106 Passerines, belonging to 17 orders and 55 families). Examined species are more than half of the species recorded so far in the regional territory, a high number considered the limited surface of study area. 70 are breeding species (60 of which are confirmed breeders), 180 are migrants (138 regular), 86 wintering (63 regular), 6 summer visitors, 29 accidental (so considered up to 5 records; 9 of which recorded before 1950). 55 are included in Annex 1 of the Birds Directive 79/490. Alien species were not considered. Out of 70 breeding species recorded, 30 species belong to non-Passerines (nP) and 40 species belong to Passerines (P). The 5 most widespread breeding species are the Carrion/Hooded Crow (Corvus corone), the Blackcap (Sylvia atricapilla), the Blackbird (Turdus merula), the Great Tit (Parus major) and the Magpie (Picea pica). The average number of species per unit is 27 and the highest numer of species in a unit is 48. The richest units are situated particularly along the Cormor and Torre torrents. The comparison with the results of other published atlases of breeding birds for Italien cities points out a high ornithological richness. The value of the non-Passerines/Passerines ratio (nP/P=0,75) is one of the highest recorded in Italy and demonstrates a great habitat heterogeneity of the study area. Information on status, phenology and local breeding habitat of each species are listed and the distribution of species in the regional territory is presented. Data on migratory movements and recoveries of ringed birds are reported. Further data concerning the speciments preserved in collections and, whereever possible, historical data from the past are also reported. Distribution maps, assessments of populations size and data on breeding biology are given for breeding species. In additon to some investigations on particular subjects, this work presents a concise check-list of all recorded species and some information on local bird ringing activities. Furthermore, there is a selection of the best spots for watching birds in the territory of Udine and some suggestions on didactic activity for students.