Graduate Thesis Or Dissertation
 

Status of prairie falcons breeding in Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/jq085n18b

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  • Distribution of nest sites and reproductive success were determined for prairie falcons breeding in Oregon during 1973 and 1974. The study area encompassed a major portion of the eastern half of the state. I located and monitored 63 breeding attempts during the study and found nest sites in a variety of habitats ranging in elevation from 200 feet to 8,300 feet. Pair bonds were formed as early as mid-March. Mean date of initiation of incubation was 16 April. Mean fledging date was 24 June. Incubation period was approximately 30 days; mean nestling period was 41 days. Mean clutch size was 4.03. Mean number fledglings per breeding attempt was 2.49. Analysis of band recovery data from 1928 through 1972 yielded first year and mean adult mortality estimates of 0.65 and 0.35 respectively. Application of a life equation and a structural model to estimates of mortality and observed productivity in Oregon indicated that the prairie falcon population in Oregon may be decreasing. Estimates of production were 19 percent below that necessary to maintain a stable population.
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file details DentonSamuelJonathon1976.pdf 2017-08-02 Pubblico Scaricare