Bald Eagle reproductive statistics across range for time periods pre- to post-DDT.
Region (years)
Total Nests
Percentage Occupied
Young per Occupied Nest
Reference
Alaska
1959–1962
38
52
0.8
262
Hensel, R. J., and W. A. Troyer (1964). Nesting studies of the Bald Eagle in Alaska. Condor 66:282–286.
1963–1970
312
61
0.9
316
Sprunt, A., IV, W. B. Robertson Jr., S. Postupalsky, R. J. Hensel, C. E. Knoder, and F. J. Ligas (1973). Comparative productivity of six Bald Eagle populations. Transactions of the North American Wildlife and Natural Resources Conference 38:96–106.
1989–1994
745
52
0.8
369
Steidl, R. J., K. D. Kozie, and R. G. Anthony (1997). Reproductive success of Bald Eagles in interior Alaska. Journal of Wildlife Management 61(4):1313–1321.
Kodiak Island 1963
326
48
1.1
447
Zwiefelhofer, D. (2007). Comparison of Bald Eagle (Haliaeetus leucocephalus) nesting and productivity at Kodiak National Wildlife Refuge, Alaska, 1963–2002. Journal of Raptor Research 41:1–9.
Kodiak Island 2002
979
55
0.87
447
Zwiefelhofer, D. (2007). Comparison of Bald Eagle (Haliaeetus leucocephalus) nesting and productivity at Kodiak National Wildlife Refuge, Alaska, 1963–2002. Journal of Raptor Research 41:1–9.
Florida
1939–1946
392
70
1.2
171
Broley, C. L. (1947). Migration and nesting of Florida Bald Eagles. Wilson Bulletin 59:3–20.
1961–1972
592
50
0.7
316
Sprunt, A., IV, W. B. Robertson Jr., S. Postupalsky, R. J. Hensel, C. E. Knoder, and F. J. Ligas (1973). Comparative productivity of six Bald Eagle populations. Transactions of the North American Wildlife and Natural Resources Conference 38:96–106.
1973–1979
1,674
61
0.9
317
Nesbitt, S. A. (1998). Bald Eagle population monitoring. Florida Fish and Wildlife Conservation Commission, Tallahassee, FL, USA.
1980–1989
3,759
67
1.1
317
Nesbitt, S. A. (1998). Bald Eagle population monitoring. Florida Fish and Wildlife Conservation Commission, Tallahassee, FL, USA.
1990–1998
6,725
76
1.2
317
Nesbitt, S. A. (1998). Bald Eagle population monitoring. Florida Fish and Wildlife Conservation Commission, Tallahassee, FL, USA.
1997–2001
120
90
1.32
279
Millsap, B., T. Breen, E. McConnell, T. Steffer, L. Phillips, N. Douglass, and S. Taylor (2004). Comparative fecundity and survival of Bald Eagles fledged from suburban and rural natal areas in Florida. Journal of Wildlife Management 68:1018–1031.
Oregon
1971–1979
252
75
1.1
448
Isaacs, F. B., and R. G. Anthony (1998). Results of the 1998 Bald Eagle nest survey. Oregon Cooperative Wildlife Research Unit, Corvallis, OR, USA.
1980–1989
1,237
58
0.9
448
Isaacs, F. B., and R. G. Anthony (1998). Results of the 1998 Bald Eagle nest survey. Oregon Cooperative Wildlife Research Unit, Corvallis, OR, USA.
1990–1998
2,050
60
0.9
448
Isaacs, F. B., and R. G. Anthony (1998). Results of the 1998 Bald Eagle nest survey. Oregon Cooperative Wildlife Research Unit, Corvallis, OR, USA.
1971–2007
9,585
84.8
0.97
449
Isaacs, F. B., and R. G. Anthony (2011). Bald Eagles (Haliaeetus leucocephalus) nesting in Oregon and along the lower Columbia River, 1978–2007. Final Report 18. Oregon Cooperative Wildlife Research Unit, Corvallis, OR, USA.
Saskatchewan
1968–1979
244
70
1
147
Gerrard, J. M., P. N. Gerrard, G. R. Bortolotti, and E. H. Dzus (1992). A 24-year study of Bald Eagles on Besnard Lake, Saskatchewan. Journal of Raptor Research 26:159–166.
1981–1991
322
67
1
147
Gerrard, J. M., P. N. Gerrard, G. R. Bortolotti, and E. H. Dzus (1992). A 24-year study of Bald Eagles on Besnard Lake, Saskatchewan. Journal of Raptor Research 26:159–166.
Maine
1962–1976
421
27
0.33
450
Todd, C. S., and A. Weik (1998). Bald Eagle. In Research and Management Report 1998 (G. J. Matula, Editor). Maine Department of Inland Fisheries and Wildlife, Augusta, ME, USA.
1977–1989
870
50
0.7
450
Todd, C. S., and A. Weik (1998). Bald Eagle. In Research and Management Report 1998 (G. J. Matula, Editor). Maine Department of Inland Fisheries and Wildlife, Augusta, ME, USA.
1990–1997
1,286
57
0.8
450
Todd, C. S., and A. Weik (1998). Bald Eagle. In Research and Management Report 1998 (G. J. Matula, Editor). Maine Department of Inland Fisheries and Wildlife, Augusta, ME, USA.
Chesapeake Bay
1936
39
79
1.6
313
Tyrrell, W. B. (1936). Report of eagle survey. National Audubon Society, Washington, DC, USA.
1962
37
14
0.2
314
Abbott, J. M. (1962). Status report on the Bald Eagle. Virginia Wildlife 23(7):4–6.
1970
55
31
0.4
451
Abbott, J. M. (1970). 1970 Bald Eagle nest survey. Atlantic Naturalist 25:169–171.
1981–1990
1,448
70
1.2
325
Buehler, D. A., J. D. Fraser, J. K. D. Seegar, G. D. Therres, and M. A. Byrd (1991). Survival rates and population dynamics of Bald Eagles on Chesapeake Bay. Journal of Wildlife Management 55:608–613.
Wisconsin (Inland)
1962–1970
492
66
1.3
316
Sprunt, A., IV, W. B. Robertson Jr., S. Postupalsky, R. J. Hensel, C. E. Knoder, and F. J. Ligas (1973). Comparative productivity of six Bald Eagle populations. Transactions of the North American Wildlife and Natural Resources Conference 38:96–106.
1980–1989
2,422
76
1.3
445
U.S. Fish and Wildlife Service (1990). Bald eagle production in the north central region, 1973–1989. U.S. Fish and Wildlife Service, Washington, DC, USA.
Great Lakes
1961–1970
156
10
0.1
316
Sprunt, A., IV, W. B. Robertson Jr., S. Postupalsky, R. J. Hensel, C. E. Knoder, and F. J. Ligas (1973). Comparative productivity of six Bald Eagle populations. Transactions of the North American Wildlife and Natural Resources Conference 38:96–106.
1977–1989
513
65
0.6
452
Bowerman, W. W. (1993). Regulation of Bald Eagle (Haliaeetus leucocephalus) productivity in the Great Lakes basin: An ecological and toxicological approach. Ph.D. dissertation, Michigan State University, East Lansing, MI, USA.
1990–1993
456
81
0.8
452
Bowerman, W. W. (1993). Regulation of Bald Eagle (Haliaeetus leucocephalus) productivity in the Great Lakes basin: An ecological and toxicological approach. Ph.D. dissertation, Michigan State University, East Lansing, MI, USA.
Yellowstone
1960–1973
38
45
0.8
157
Swenson, J. E., K. L. Alt, and R. L. Eng (1986). Ecology of Bald Eagles in the greater Yellowstone ecosystem. Wildlife Monographs 95.
1974–1982
70
27
0.4
157
Swenson, J. E., K. L. Alt, and R. L. Eng (1986). Ecology of Bald Eagles in the greater Yellowstone ecosystem. Wildlife Monographs 95.