We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Demography of population recovery: survival and fidelity of peregrine falcons at various stages of population recovery.
- Authors
Smith, George; Murillo-García, Oscar; Hostetler, Jeffrey; Mearns, Richard; Rollie, Chris; Newton, Ian; McGrady, Michael; Oli, Madan
- Abstract
Factors influencing vital demographic rates and population dynamics can vary across phases of population growth. We studied factors influencing survival and fidelity of peregrine falcons in south Scotland-north England at two stages of population growth: when the population was recovering from pesticide-related declines and density was low, and when it had largely recovered from pesticide effects and density was high. Fidelity was higher for: adults and subadults than for juveniles, females than for males, and juveniles and adults during the low-density than during the high-density study period. Survival was age specific, with lower survival for juveniles than for older birds (juveniles, 0.600 ± SE 0.063; subadults, 0.811 ± 0.058; adults, 0.810 ± 0.034). Furthermore, there was some evidence that survival was generally lower for all age classes during the low-density period than during the high-density period, possibly due to a chronic, persistent effect of organochlorine pesticides as the population recovered. Evidence for a density-dependent effect on survival was weak, but a negative effect of density on fidelity of juveniles (dispersing age class) during the recovery phase suggests density-dependent dispersal when the population was increasing. Our results show how population density can influence demographic parameters differently and how such influences can vary across phases of population growth.
- Subjects
PEREGRINE falcon; PESTICIDES; ANIMAL young; BIRD populations; FALCONS; ANIMAL behavior
- Publication
Oecologia, 2015, Vol 178, Issue 2, p391
- ISSN
0029-8549
- Publication type
Article
- DOI
10.1007/s00442-014-3168-3