Double-Survey Estimates of Bald Eagle Populations in Oregon

Double-Survey Estimates of Bald Eagle Populations in Oregon

The literature on abundance of birds of prey is almost devoid of population estimates with statistical rigor. Therefore, we surveyed bald eagle (Haliaeetus leucocephalus) populations on the Crooked and lower Columbia rivers of Oregon and used the double-survey method to estimate populations and sigh...

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Veröffentlicht in:The Journal of wildlife management 1999-07, Vol.63 (3), p.794-802
Hauptverfasser: Anthony, Robert G., Garrett, Monte G., Isaacs, Frank B.
Format: Artikel
Sprache:eng
Schlagworte:
Aircraft
Animal populations
Animal, plant and microbial ecology
Biological and medical sciences
Birds
Boats
Eagles
Estimation bias
Estimation methods
Fundamental and applied biological sciences. Psychology
General aspects. Techniques
Methods and techniques (sampling, tagging, trapping, modelling...)
Population estimates
Statistical methods
Survey methods
Vehicles
Wildlife management
Wildlife population estimation
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Beschreibung
Zusammenfassung:The literature on abundance of birds of prey is almost devoid of population estimates with statistical rigor. Therefore, we surveyed bald eagle (Haliaeetus leucocephalus) populations on the Crooked and lower Columbia rivers of Oregon and used the double-survey method to estimate populations and sighting probabilities for different survey methods (aerial, boat, vehicle) and bald eagle ages (adults vs. subadults). Sighting probabilities were consistently
ISSN:0022-541X
1937-2817
DOI:10.2307/3802792