After a well-documented recovery following substantial population declines throughout most of North America, the Peregrine Falcon (Falco peregrinus) was delisted in the U.S. under provisions of the U.S. Endangered Species Act in 1999. Post-delisting monitoring for the Peregrine Falcon stipulated surveys of breeding locations and did not specifically emphasize other metrics of population dynamics such as survival.

Dan Varland and colleagues used banding data from Peregrine Falcons captured on the Washington coast during 1,212 vehicle surveys of raptors between 1995 and 2018 to: (1) evaluate trends in the occurrence of Peregrine Falcons and Bald Eagles, (2) evaluate the occurrence of Peregrine Falcons subspecies, and (3) estimate apparent survival probability and resighting probability for age and sex classes of peregrines for designated time periods. They also evaluated the effects of changing levels of observer effort and Bald Eagle abundance on apparent survival and on the probability of resighting falcons.

Their long-term mark-resighting analyses provide evidence of a reasonably high level of apparent survival that suggests good population performance. Dan will share the findings interspersed with amazing photos of Peregrine Falcons and more.

REGISTRATIONS FOR THIS WEBINAR IS NOW CLOSED