INVESTIGADORES
BERKUNSKY Igor
congresos y reuniones científicas
Título:
Breeding ecology of the Blue-crowned Parakeet (Thectocercus acuticaudatus) in the Argentinean Chaco
Autor/es:
BERKUNSKY, IGOR; ARAMBURÚ, ROSANA M; RUGGERA, ROMAN A.; KACOLIRIS, FEDERICO PABLO
Lugar:
Washington, D.C.
Reunión:
Congreso; North American Ornithological Congress NAOC VI; 2016
Institución organizadora:
North American Ornithological Associations
Resumen:
The main argument that supports harvesting parrots is that harvested nestlings are nestlings that would not survive. A local community based harvesting program in Argentina regulates the harvest and commercialization of Blue Crowned Parakeets (Thectocercus acuticaudatus). We determined the main factors that affect the reproductive success of Blue-crowned Parakeet in the Chaco region of Argentina. Parakeets used cavities wide and deep in live and mature trees with high entrance holes. Clutch size was 4.2 eggs and it decreased along the breeding season. Number of eggs at the end of incubation was 3.9 and number of chicks hatched was 3.4. We observed brood reduction in 20% of the nests and it was more frequent in broods of three and four chicks. The length of the chick?s period was positively associated with brood size. Male chicks reached a higher body mass and size than females. On average 3.0 chicks fledged per nest. Nest survival varied between 47% and 61% depending of the year. Seventy-nine percent of the nests found during construction and early laying completed the incubation and 61% produced at least one fledgling. Most nests failed during the incubation and the first 10 days of the chick?s period. Daily survival rates varied between 98.9% and 99.3%. The best models to explain survival included as covariates height of entrance hole. Nest site fidelity was 75% and cavity reoccupation was 55%. This information is particularly relevant for estimating the impact that harvesting could have on parakeet wild populations.