POST-FLEDGING SURVIVAL AND DISPERSAL OF PEREGRINE FALCONS DURING A RESTORATION PROJECT Sobre vivencia de volantones y dispersion de halcones peregrinos durante un proyecto de restauracion
We monitored 38 juvenile Peregrine Falcons (Falco peregrinus) up to 3 mo immediately after their release from a hack box during 1999-2000. The restoration site was a cliff near Eagle Point Park in Dubuque, Iowa. Falcons were released in a staggered manner from mid-:June until late July each summer....
| Main Authors: | , , , |
|---|---|
| Format: | Text |
| Language: | unknown |
| Published: |
DigitalCommons@University of Nebraska - Lincoln
2002
|
| Subjects: | |
| Online Access: | https://digitalcommons.unl.edu/natrespapers/426 https://digitalcommons.unl.edu/context/natrespapers/article/1430/viewcontent/Powell_JRR_2002_Post_fledgling_survival.pdf |
| Summary: | We monitored 38 juvenile Peregrine Falcons (Falco peregrinus) up to 3 mo immediately after their release from a hack box during 1999-2000. The restoration site was a cliff near Eagle Point Park in Dubuque, Iowa. Falcons were released in a staggered manner from mid-:June until late July each summer. Older falcons remained at the site longer than at previous urban releases and interacted with the younger falcons. The four mortalities (11 %) confirmed during the observation periods were discovered and reported by citizens near the release site. We used radiotelemetry, observations of colormarked birds at the hack site, and recovered mortalities to estimate weekly survival rates and dispersal patterns. We estimated weekly survival rate to be 0.988 (SE = 0.01), and our weekly resighting rate was high: 0.885 (SE = 0.03). Juveniles were observed for an average of 4.3 wk in 1999 (SD = 2.5), but only 3.4 wk in 2000 (SD = 2.3). Accordingly, weekly fidelity rates were year-specific: 0.903 (SE = 0.03) in 1999 and 0.795 (SE = 0.05) in 2000. No mortalities were attributed to Great-horned Owl (Bubo virginianus) predation, but substantial numbers of owls were seen in summer 2000. The presence of owls in 2000 may have contributed to the difference in fidelity rates and dispersal patterns between years. Monitoreamos 38 halcones peregrinos (Falco peregrinus) juveniles hasta 3 meses inmediatamente despues de su liberacion desde una "caja de suelta" durante 1999-2000. El sitio de restauracion era un risco cerca la parque Pun to del Aguila en Dubuque, Iowa. Los halcones fueron liberados en forma escalonada desde mediados de junio hasta finales de julio de cada verano. Los halcones mas adultos permanecieron por mas tiempo en los sitios urbanos en los cuales interactuaron con los halcones mas jovenes. Las cuatro muertes (11 %) confirmadas durante los periodos de observacion fueron descubiertas y reportadas por ciudadanos cerca a los sitios de liberacion. Utilizamos la telemetria y las observaciones de aves marcadas con colores en los ... |
|---|