INVESTIGADORES
SARASOLA jose Hernan
congresos y reuniones científicas
Título:
Post-dispersal movements and juvenile survival of the Solitary Crowned Eagle (Harpyhaliaetus coronatus) in Central Argentina
Autor/es:
MOJICA, E.K.; GALMES, M.E.; PAXTON, B.J.; WATTS, B.D.; GRANDE, J.M.; SARASOLA, J.H.
Reunión:
Conferencia; I Worldwide Raptor Conference; 2013
Resumen:
We tracked 10 juvenile Crowned Solitary Eagles from nesting sites in 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 lengthy post-fledging periods with dispersal from natal territories occurring at an average of 236 days old (95% CI: 218-252). Dispersal coincided with the start of the next breeding season. Juvenile eagles dispersed widely in the first year ( x = 300 km; 95% CI: 124-477 km). Eagles dispersed into the Argentinean provinces of Cordoba, San Luis, La Pampa, Rio Negro and southern Buenos Aires including areas of Calden forest, pastures, ranches, and agricultural areas. We estimated post-dispersal home ranges (95% kernel utilization distribution) for four eagles ( x = 4449 km; 95% CI: 0 ? 8943 km). Tracking data revealed humans are a significant threat to the Crowned Solitary Eagle with 30% of tracked juveniles dead in their first two years 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.