used patagial tags, VHF radio transmitters, and satellite-received transmitters
to investigate the movements and survival of juvenile saker falcons fledged
from artificial nests in open landscapes and natural nest sites in hilly areas
in Mongolia. During the post-fledging dependence period (PFDP) juveniles
progressively moved farther from their nest until dispersal from the natal
area. Natal home ranges were larger for juveniles fledged at artificial than
natural sites and the distance moved by juveniles during PFDP was positively
related to fledging date and brood size. Duration of the PFDP was estimated as 40
days (range: 31-52 days). Over the PFDP, the best-fitting model to explain juvenile
survival incorporated fledging date and nest site type, with juvenile survival
being higher in early fledged broods from natural sites. Predation was
identified as a major cause of mortality, especially in open landscapes where
artificial nests were located. However, because artificial nests produced more
fledglings, we found that overall productivity of juveniles to dispersal at
artificial and natural nests sites did not differ significantly.
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