Douglas Johnson
Douglas Johnson is a Research Statistician (Emeritus) for the USGS Northern Prairie Wildlife Research Center in Jamestown, North Dakota.
Science and Products
Filter Total Items: 310
Breeding population inventories and measures of recruitment
In this chapter we review the techniques used to measure two important parameters of waterfowl populations, size of breeding population and recruitment. If waterfowl are to be managed toward goals defined in terms of population sizes such as those in the recently signed North American Waterfowl Management Plan (U.S. Fish and Wildlife Service [USFWS] and Canadian Wildlife Service [CWS] 1986), there
Authors
L.M. Cowardin, R.J. Blohm
[Book review] Modern Elementary Probability and Statistics, by E. J. Dudewicz, P. Chen, and B. K. Taneja
Review of: Modern Elementary Probability and Statistics, by Edward J. Dudewicz, Pinyuen Chen, and Baldeo K. Taneja. Colombus, OH: American Sciences Press, 1989, ix + 372 pp., $34.50 (paperback).
Authors
D. H. Johnson
Breeding bird censuses 86-91: Kentucky bluegrass prairie and mixed prairie
Abstract has not been submitted
Authors
D. H. Johnson, M.D. Schwartz
Ground motion
No abstract available.
Authors
Roger D. Borcherdt, N. C. Donovan, Mehmet Çelebi, A. Shakal, M. Huang, M. Reichle, C. Ventura, T. Cao, R. Bherburne, M. Savage, Robert B. Darragh, C. Petersen, David Boore, W. B. Joyner, E. V. Leyendecker, P. C. Thenhaus, Kimberly W. Campo, Margaret G. Hopper, S.L. Hanson, S. T. Algermissen, David M. Perkins, Susan E. Hough, D. Simpson, A. Lerner-Lam, P.A. Friberg, R. Busby, L. Shengold, M. Tuttle, Edward H. Field, K.H. Jacob, J. Pacheco, C. Estabrook, M. Peterson, D. H. Johnson, Arthur Frankel
Estimating nest success: When Mayfield wins
The Apparent estimator of nest success may be severely biased because unsuccessful nests are less likely to be found than are successful nests. The Mayfield estimator is a preferred alternative. The situation is somewhat different for nests in colonies or on islands because of greater visibility of nests, higher synchrony of nesting, and often higher hatch rates than dispersed mainland nests. Also
Authors
D. H. Johnson, T.L. Shaffer
Bird censuses 77-82: Kentucky bluegrass prairie and mixed prairies I-V
Abstract has not been submitted
Authors
D. H. Johnson, M.D. Schwartz
Conditioning of sandhill cranes during fall migration
Body mass of adult female and male sandhill cranes (Grus canadensis) increased an average of 17 and 20%, respectively, from early September to late October on staging areas in central North Dakota and varied by year. Increases in body mass averaged 550 and 681 g among female and male G. c. canadensis, respectively, and 616 and 836 g among female and male G. c. rowani. Adult and juvenile G. c. rowa
Authors
Gary L. Krapu, Douglas H. Johnson
Weights of wild mallard Anas platyrhynchos, gadwall A. strepera, and blue-winged teal A. discors during the breeding season
During 1976-81 we weighed several thousands of wild Mallard, Gadwall, and Blue-winged Teal in central North Dakota to examine duckling growth patterns, adult weights, and the factors influencing them. One-day-old Mallard and Gadwall averaged 32.4 and 30.4 g, respectively, a reduction of 34% and 29% from fresh egg weights. In all three species, the logistic growth curve provided a good fit for duck
Authors
John T. Lokemoen, Douglas H. Johnson, David E. Sharp
[Book review] A new text on birds: Ornithology, by Frank B. Gill
Review of: Ornithology. Frank B. Gill. New York : W.H. Freeman, 1990. ISBN: 0716720655.
Authors
D. H. Johnson
Breeding bird census: 1988 - Kentucky bluegrass prairie: mixed prairie I-V
Abstract has not been submitted
Authors
D. H. Johnson
Breeding canvasbacks: a test of a habitat model
Schroeder (1984) proposed a habitat suitability model for breeding canvasbacks (Aythya valisineria) based on the size, water regime, and emergent vegetation of wetlands. We evaluated the model with data from surveys of canvasbacks on 2265 wetlands in North Dakota, South Dakota, and Minnesota. The model proved inadequate as a predictor of canvasback pair density; the correlation between values prod
Authors
D. H. Johnson, M.C. Hammond, T. L. McDonald, C.L. Nustad
Science and Products
Filter Total Items: 310
Breeding population inventories and measures of recruitment
In this chapter we review the techniques used to measure two important parameters of waterfowl populations, size of breeding population and recruitment. If waterfowl are to be managed toward goals defined in terms of population sizes such as those in the recently signed North American Waterfowl Management Plan (U.S. Fish and Wildlife Service [USFWS] and Canadian Wildlife Service [CWS] 1986), there
Authors
L.M. Cowardin, R.J. Blohm
[Book review] Modern Elementary Probability and Statistics, by E. J. Dudewicz, P. Chen, and B. K. Taneja
Review of: Modern Elementary Probability and Statistics, by Edward J. Dudewicz, Pinyuen Chen, and Baldeo K. Taneja. Colombus, OH: American Sciences Press, 1989, ix + 372 pp., $34.50 (paperback).
Authors
D. H. Johnson
Breeding bird censuses 86-91: Kentucky bluegrass prairie and mixed prairie
Abstract has not been submitted
Authors
D. H. Johnson, M.D. Schwartz
Ground motion
No abstract available.
Authors
Roger D. Borcherdt, N. C. Donovan, Mehmet Çelebi, A. Shakal, M. Huang, M. Reichle, C. Ventura, T. Cao, R. Bherburne, M. Savage, Robert B. Darragh, C. Petersen, David Boore, W. B. Joyner, E. V. Leyendecker, P. C. Thenhaus, Kimberly W. Campo, Margaret G. Hopper, S.L. Hanson, S. T. Algermissen, David M. Perkins, Susan E. Hough, D. Simpson, A. Lerner-Lam, P.A. Friberg, R. Busby, L. Shengold, M. Tuttle, Edward H. Field, K.H. Jacob, J. Pacheco, C. Estabrook, M. Peterson, D. H. Johnson, Arthur Frankel
Estimating nest success: When Mayfield wins
The Apparent estimator of nest success may be severely biased because unsuccessful nests are less likely to be found than are successful nests. The Mayfield estimator is a preferred alternative. The situation is somewhat different for nests in colonies or on islands because of greater visibility of nests, higher synchrony of nesting, and often higher hatch rates than dispersed mainland nests. Also
Authors
D. H. Johnson, T.L. Shaffer
Bird censuses 77-82: Kentucky bluegrass prairie and mixed prairies I-V
Abstract has not been submitted
Authors
D. H. Johnson, M.D. Schwartz
Conditioning of sandhill cranes during fall migration
Body mass of adult female and male sandhill cranes (Grus canadensis) increased an average of 17 and 20%, respectively, from early September to late October on staging areas in central North Dakota and varied by year. Increases in body mass averaged 550 and 681 g among female and male G. c. canadensis, respectively, and 616 and 836 g among female and male G. c. rowani. Adult and juvenile G. c. rowa
Authors
Gary L. Krapu, Douglas H. Johnson
Weights of wild mallard Anas platyrhynchos, gadwall A. strepera, and blue-winged teal A. discors during the breeding season
During 1976-81 we weighed several thousands of wild Mallard, Gadwall, and Blue-winged Teal in central North Dakota to examine duckling growth patterns, adult weights, and the factors influencing them. One-day-old Mallard and Gadwall averaged 32.4 and 30.4 g, respectively, a reduction of 34% and 29% from fresh egg weights. In all three species, the logistic growth curve provided a good fit for duck
Authors
John T. Lokemoen, Douglas H. Johnson, David E. Sharp
[Book review] A new text on birds: Ornithology, by Frank B. Gill
Review of: Ornithology. Frank B. Gill. New York : W.H. Freeman, 1990. ISBN: 0716720655.
Authors
D. H. Johnson
Breeding bird census: 1988 - Kentucky bluegrass prairie: mixed prairie I-V
Abstract has not been submitted
Authors
D. H. Johnson
Breeding canvasbacks: a test of a habitat model
Schroeder (1984) proposed a habitat suitability model for breeding canvasbacks (Aythya valisineria) based on the size, water regime, and emergent vegetation of wetlands. We evaluated the model with data from surveys of canvasbacks on 2265 wetlands in North Dakota, South Dakota, and Minnesota. The model proved inadequate as a predictor of canvasback pair density; the correlation between values prod
Authors
D. H. Johnson, M.C. Hammond, T. L. McDonald, C.L. Nustad