Influence of habitat and nest-site quality on the breeding performance of Lanner Falcons Falco biarmicus

• Autorzy: Amato M. , Ossino A. , Brogna A. , Cipriano M. , D'Angelo R. , Dipasquale G. , Mannino V. , Andreotti A. , Leonardi G.

Warianty tytułu

PL

Wpływ czynników środowiskowych i jakości miejsca lęgowego na liczbę podlotów u raroga górskiego

• Języki publikacji: EN

Abstrakty

EN

Site quality may influence breeding performance especially in raptors showing strong territory fidelity as predicted by the site-dependent population regulation hypothesis. Thus, the occupancy of nest-sites is non-random, indicating a preference of certain territories, apparently of higher quality. During four breeding seasons (2003-2006), we recorded the occupancy rate and the number of young fledged from Lanner Falcon Falco biarmicus feldeggii nest-sites in eastern Sicily, Italy. Breeding sites with different occupancy rates showed significant differences in environmental attributes, mainly altitude. A generalised linear model revealed a significant effect of the slope of the nest-site on mean fledgling number per successful pair. In addition, the mean slope of the nest territory and the slope of the nest-site are the main predictors for differentiating the cliff selection by Lanners and by much more competitive Peregrine Falcons Falco peregrinus. Finally, our results suggest a crucial role of the high quality sites for the population viability. Occupancy rates were positively related to the mean number of young fledged per territorial pair and during the four years of the study period six high quality nest-sites raised 58% of young produced in the whole study area. We suggest that the annual production of young of the high quality territories should be preserved and that evaluation of the effective contribution of the low quality sites for the persistence of a viable population in Sicily should be performed.

PL

Badania prowadzono na Sycylii w latach 2003- 2006. Wyszukano i regularnie monitorowano 37 miejsc gniazdowych zajętych przynajmniej jeden raz przez raroga górskiego i/lub sokoła wędrownego. Określano liczbę podlotów, oraz zmienne środowiskowe i klimatyczne dla gniazda i terytorium wokół niego (Tab. 1). Wydzielono dwie kategorie miejsc gniazdowych w zależności od liczby sezonów, przez które były one zajęte przez rarogi: L1 — o częstym (ponad dwa sezony) i L2 — rzadkim (do dwóch sezonów) wykorzystaniu. Miejsca lęgowe różniące się częstością wykorzystania przez rarogi różniły się kilkoma zmiennymi środowiskowymi, w tym wysokością n.p.m. (Tab. 2). W porównaniu do miejsc gniazdowych sokoła wędrownego (który może przejmować miejsca wykorzystywane przez rarogi), często zajmowane miejsca gniazdowe rarogów znajdowały się na niższych i mniej stromych skałach (Tab. 2). Stwierdzono, że im częściej zajmowane jest dane miejsce lęgowe, tym większa liczba piskląt jest z niego wyprowadzana (Fig. 1). Na liczbę podlotów wpływało także nachylenie terenu w najbliższej okolicy gniazda. W ciągu 4 lat badań z 6 najczęściej wykorzystywanych miejsc gniazdowych zostało wyprowadzonych 58% wszystkich zaobserwowanych w tym czasie piskląt.

Słowa kluczowe

EN

habitat; nest site; quality; breeding performance; Lanner Falcon; Falco biarmicus; territory size; occupancy; nest site selection; Sicily

• Wydawca: -
• Czasopismo: Acta Ornithologica
• Rocznik: 2014
• Tom: 49
• Numer: 1
• Opis fizyczny: p.1-7,fig.,ref.

Twórcy

autor

Amato M.

• Studio-Natura Mediterraneo, Environmental Studies, Via Volturno, 36, 96016 Lentini (SR), Italy

autor

Ossino A.

• Studio-Natura Mediterraneo, Environmental Studies, Via Volturno, 36, 96016 Lentini (SR), Italy

autor

Brogna A.

• Osservatorio Natura, Via Stazzone, 235, 95124 Catania, Italy

autor

Cipriano M.

• Functional Proteomics Laboratory, Biotechnology Department, Siena University, Siena, Italy

autor

D'Angelo R.

• Osservatorio Natura, Via Stazzone, 235, 95124 Catania, Italy

autor

Dipasquale G.

• Osservatorio Natura, Via Stazzone, 235, 95124 Catania, Italy

autor

Mannino V.

• Osservatorio Natura, Via Stazzone, 235, 95124 Catania, Italy

autor

Andreotti A.

• Istituto Superiore per la Protezione e la Ricerca Ambientale (ISPRA), Via Ca’ Fornacetta, 9, 40064 Ozzano dell’Emilia, Bologna, Italy

autor

Leonardi G.

• Osservatorio Natura, Via Stazzone, 235, 95124 Catania, Italy

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Identyfikatory

DOI

10.3161/000164514X682841