Raptor Surveys and Monitoring
This research largely involves developing and applying survey methods to gather and analyze data to study raptor population biology and population status. Results also provide land and wildlife managers with information about the general distribution and local occurrence of birds of prey. Most raptor species occur in low densities compared to other birds. Raptors are widely dispersed during much of the year, and they often exhibit behavior that makes them difficult to observe. Our work has involved innovation with searching strategies and sampling designs to develop safe, practical methods for finding and counting raptors in diverse, sometimes remote locales. We also use existing records of observations and counts for learning where raptors occur in areas of interest to managers, and to synthesize information to be used to summarize the status of raptors.
Below are publications associated with this project.
Assessment of frequency and duration of point counts when surveying for golden eagle presence
Estimation of occupancy, breeding success, and predicted abundance of golden eagles (Aquila chrysaetos) in the Diablo Range, California, 2014
Use of large-scale, multi-species surveys to monitor gyrfalcon and ptarmigan populations
Developing Gyrfalcon surveys and monitoring for Alaska
Detection probability of cliff-nesting raptors during helicopter and fixed-wing aircraft surveys in western Alaska
Surveying woodland hawks with broadcasts of great horned owl vocalization
Detecting trends in raptor counts: power and type I error rates of various statistical tests
Assessing ground-based counts of nestling bald eagles in northeastern Minnesota
Our living resources: A report to the nation on the distribution, abundance, and health of U.S. plants, animals, and ecosystems
Area-occupied survey technique for nesting woodland raptors
Recent trends in counts of migrant hawks from northeastern North America
An evaluation of the Christmas Bird Count for monitoring population trends of selected species
This research largely involves developing and applying survey methods to gather and analyze data to study raptor population biology and population status. Results also provide land and wildlife managers with information about the general distribution and local occurrence of birds of prey. Most raptor species occur in low densities compared to other birds. Raptors are widely dispersed during much of the year, and they often exhibit behavior that makes them difficult to observe. Our work has involved innovation with searching strategies and sampling designs to develop safe, practical methods for finding and counting raptors in diverse, sometimes remote locales. We also use existing records of observations and counts for learning where raptors occur in areas of interest to managers, and to synthesize information to be used to summarize the status of raptors.
Below are publications associated with this project.