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Survival Rates and Population Dynamics of Bald Eagles on Chesapeake Bay
David A. Buehler, James D. Fraser, Janis K. D. Seegar and Glenn D. Therres
The Journal of Wildlife Management
Vol. 55, No. 4 (Oct., 1991), pp. 608-613
Stable URL: http://www.jstor.org/stable/3809506
Page Count: 6
You can always find the topics here!Topics: Eagles, Population growth, Bays, Population estimates, Breeding value, Breeding, Survival rates, Radio, Modeling, Birds of prey
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Survival of 39 radio-tagged bald eagles (Haliaeetus leucocephalus) in the Chesapeake Bay region was 100% in the first year of life. Mean minimum survival per year of all eagles was 91% (95% CI = 86-96%); mean maximum survival was 98% (95% CI = 96-100%). A deterministic life-table model predicted a finite growth rate of 5.8% per year, whereas the growth rate based on the maximum survival estimates was 16.6% per year. The breeding population actually increased 12.6% per year from 1986 to 1990. We estimated the intrinsic growth rate at 6.9% based on natality and minimum survival data and 19.2% based on maximum survival data. Because eagle habitat is being converted to human developments at a rapid rate on the Chesapeake, models incorporating these habitat losses are needed to accurately predict future population trends.
The Journal of Wildlife Management © 1991 Wiley