INVESTIGADORES
SOLARO claudina
congresos y reuniones científicas
Título:
Short to Long-distance Dispersal Movements of Chimango caracaras (Milvago chimango) Reveled by Band Recovery and Resighting Data
Autor/es:
CLAUDINA SOLARO; JOSÉ HERNÁN SARASOLA
Lugar:
San Carlos de Bariloche
Reunión:
Congreso; I Worlwide Raptor Conference; 2013
Resumen:
Dispersal movements are a key aspect in animal ecology due to their potential to regulate population dynamics, but are one of the least studied topics in avian biology in general and in Neotropical raptors in particular. Bird banding is an important tool used to understand dispersal movements. The Chimango Caracara is one of the most common birds of prey in South America, but little is known about the movements of adult and juveniles of this species. We examined patterns of dispersal movements of Chimango Caracaras based on band recovery, and on recapture and resighting of previously marked birds. We banded 694 adults and 676 nestling and juvenile Chimango Caracaras at three sites in La Pampa province. Of these 270 were recaptured and 128 were resighted. A total of 23 individuals banded as nestlings or fledglings were recaptured or resighted as reproductive adults in following reproductive seasons. Of these, 78.3% (18 birds) bred in the same site where originated, and 21.7% (five birds) bred at different sites. An adult male of this last group was resighted in an urban area of San Carlos de Bariloche (Neuquen province, Argentina, 785 km from its natal site), while the remaining three females and one male dispersed about 10 km from their natal territories. Our results indicate that although the bulk of the population of Chimango Caracaras are phylopatric, some individuals perform moderate to long distance dispersal movements. These results have important implications not only for the species spatial ecology and demography but also for taxonomy, population genetics and gene flow because birds from Patagonia have been considered a distinct sub-species from those of central Argentina