| Titre : | Geographical variation in pre-migratory condition of Swallows Hirundo rustica in Italy |
| Auteurs : | Andrea Pilastro, Auteur ; Fernando Spina, Auteur ; Pierfrancesco Micheloni, Auteur |
| Type de document : | Article |
| Dans : | Ringing & Migration (19(1) May, 1998) |
| Article en page(s) : | 67-74 |
| Résumé : | In order to investigate pre-migratory strategies of Swallows in Italy, simultaneous ringing activities were carried on during three focal days (September 6-8, 1996) at 24 different roosts scattered across the Italian peninsula and main islands. A total of 8,771 Swallows was ringed, out of which 81.8% were juveniles and 18.2% adults. Among the latter, 28.3% were classified as males and 71.7% as females. Most birds had already completed their body moult; a higher fraction of birds still in active moult was found among adults. The frequency of adults with active primary moult was intermediate between the values reported for Northern-Central and Southern Europe respectively. Mean body mass values were higher in adults, which were also fatter than juveniles. Both in adults and juveniles, fat score was significantly lower in moulting birds. A high variability in mean body mass values and frequency of fat birds was found between roosts. The mean body mass of the 25% heavier birds corresponded to 24.1% and 30.5% of the lean body mass for juveniles and adults respectively. The situation observed in early September does not indicate a clear north-south gradient in the average physical conditions of pre-migratory Swallows, suggesting the use of roosts as sites of concentration of birds staging and fattening in the surrounding areas. The observed latitudinal gradient in the frequency of adults at the roosts might be related to earlier southward movements of more northern birds. |
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