INVESTIGADORES
GRANDE Juan manuel
congresos y reuniones científicas
Título:
Post-dispersal Movements and Juvenile Survival of the Crowned Solitary Eagle Harpyhaliaetus coronatus in Central Argentina
Autor/es:
MOJICA, E. K.; GALMES, M. A.; PAXTON, B. J.; WATTS, B. D.; SARASOLA, J. H.; GRANDE, J. M.
Lugar:
San Carlos de Bariloche
Reunión:
Conferencia; I Worldwide Raptor Conference (Raptor Research Foundation Annual Conference 2013 - III Neotropical Raptor Network Conference - WWGBP VII International Conference on Birds of Prey and Owls); 2013
Institución organizadora:
CRUB-Universidad Nacional del Comahue; Neotropical Raptor Network-The Peregrine Fund; World Working Group On Birds Of Prey And Owls; Raptor Research Foundation
Resumen:
We tracked 10 juvenile Crowned Solitary Eagles from nesting sites in the La Pampa province of Argentina using GPS transmitters to investigate post-dispersal movements and survival rates.  The Crowned Solitary Eagle is an endangered South American species with population estimates ranging from 250-1000 individuals. Little is known about the basic biology of the species including movement patterns of juvenile birds.  We found fledglings had a lengthy post-fledging period with dispersal occurring an average of 236 days (95% CI: 218-252) in the natal territory. Dispersal coincided with the start of the next breeding season.  Juvenile eagles dispersed widely in the first year (Mean = 300 km; 95% CI: 124-477 km).  Eagles dispersed in to the central Argentinean provinces of Cordoba, San Luis, La Pampa, and Rio Negro including areas of intact Calden forest, ranches, and agricultural areas. We estimated post-dispersal home range (95% kernel utilization distribution) size for four eagles (Mean = 4449 km; 95% CI:  0-8943 km).  Tracking data revealed humans continue to be a significant threat to the Crowned Solitary Eagle with 30% of tracked juveniles dead in the first two years of life from electrocutions or from shootings.  We recommend expansion of education campaigns to reduce persecution and targeted retrofitting of electrical infrastructure to decrease electrocutions throughout the species range.