Natal dispersal and recruitment of two Bonelli's Eagles Aquila fasciata: a four-year satellite tracking study

• Autorzy: Cadahia L. , Lopez-Lopez P. , Urios V. , Soutullo A. , Negro J. J.

Warianty tytułu

PL

Dyspersja natalna orzełka południowego

• Języki publikacji: EN

Abstrakty

EN

To study natal dispersal and recruitment to the breeding population in Bonelli's Eagle, two nestlings were tagged with satellite transmitters in the Iberian Peninsula in 2002. Their monthly ranges and distances were computed and fitted to regression models to describe their general trend. One bird, a female, dispersed and settled rapidly in an area which she explored intensively during four years and which finally became her first breeding site. The natal dispersal distance was 441 km, and the bird cannot therefore be considered philopatric. The other bird, a male, alternated between long travelling episodes and settlement in particular areas, exploring different regions both distant from and close to his natal territory, but no breeding attempt could be confirmed after four years of tracking. The large distances we recorded confirm the potential for gene flow among populations but, in comparison with our results from previous studies, they suggest that Bonelli's Eagles may show high variation in their natal dispersal distances and use different dispersal strategies.

PL

Aby określić odległości przebywane przez młode orzełki południowe pomiędzy opuszczeniem gniazda a przystąpieniem do rozrodu dwa młode ptaki — samca i samicę wyposażono w 2002 w nadajniki telemetrii satelitarnej zasilane baterią słoneczną. Oba ptaki pochodziły z gniazd położonych we wschodniej Hiszpanii. Samica przeleciała na dość znaczną odległość i dość szybko (po ok. 3 miesiącach — Fig. 2a) osiedliła się na terenie zajmowanym następnie przez kolejne 4 lata, gdzie przystąpiła do pierwszego lęgu (Tab. 1, Fig. 1). Odległość między miejscem, w którym się wykluła a własnym gniazdem wyniosła w linii prostej 441 km. Natomiast samiec w ciągu czterech lat od oznakowania nie był przywiązany do jednego terenu (Fig. 1, 2b). Autorzy sugerują, że w tym okresie prawdopodobnie przebywał na wielu różnych terytoriach lęgowych, sprawdzając możliwości gniazdowania, gdyż podobne strategie są obserwowane np. u orła iberyjskiego. W ciągu czterech lat obserwacji nie zanotowano próby lęgowej podjętej tego osobnika. Odległość między miejscem wyklucia a własnym gniazdem stwierdzona dla badanej samicy jest jedną z najwyższych zanotowanych do tej pory.

Słowa kluczowe

EN

Bonelli's Eagle; Aquila fasciata; bird; satellite tracking; telemetry; natal dispersal

• Wydawca: -
• Czasopismo: Acta Ornithologica
• Rocznik: 2009
• Tom: 44
• Numer: 2
• Opis fizyczny: p.192-198,fig.,ref.

Twórcy

autor

Cadahia L.

• Center for Ecological and Evolutionary Synthesis, Department of Biology, University of Oslo, PO. Box 1066, Blindern, N-0316 Oslo, Norway
• Estacion Biologica Terra Natura (Terra Natura Foundation-CIBIO), University of Alicante, Post Box 99, E-03080, Alicante, Spain

autor

Lopez-Lopez P.

• Estacion Biologica Terra Natura (Terra Natura Foundation-CIBIO), University of Alicante, Post Box 99, E-03080, Alicante, Spain
• Cavanilles Institute of Biodiversity and Evolutionary Biology, University of Valencia, Poligono de la Coma s/n, 46980 Paterna, Valencia, Spain

autor

Urios V.

• Estacion Biologica Terra Natura (Terra Natura Foundation-CIBIO), University of Alicante, Post Box 99, E-03080, Alicante, Spain

autor

Soutullo A.

• Estacion Biologica Terra Natura (Terra Natura Foundation-CIBIO), University of Alicante, Post Box 99, E-03080, Alicante, Spain

autor

Negro J. J.

• Evolutionary Ecology Department, Estacion Biologica de Donana, CSIC, Avda, Americo Vespucio, s/n, 41092, Seville, Spain

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Identyfikatory

DOI

10.3161/000164509X482777