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
Cardinal and mockingbird in Jamestown, North Dakota
Abstract has not been submitted
Authors
D. H. Johnson, J.E. Johnson
Age determination of female redhead ducks
Eighty-seven fall-collected wings from female redhead ducks (Aythya americana) were assigned to the adult or juvenile group based on 'tertial' and 'tertial covert' shape and wear. To obtain spring age-related characters from these fall-collected groupings, we considered parameters of flight feathers retained until after the first breeding season. Parameters measured included: markings on and width
Authors
C.W. Dane, D. H. Johnson
Fitting Richards' curve to data of diverse origins
Published techniques for fitting data to nonlinear growth curves are briefly reviewed, most techniques require knowledge of the shape of the curve. A flexible growth curve developed by Richards (1959) is discussed as an alternative when the shape is unknown. The shape of this curve is governed by a specific parameter which can be estimated from the data. We describe in detail the fitting of a dive
Authors
D. H. Johnson, A. B. Sargeant, S.H. Allen
Migration of birds in North Dakota during fall 1974
Abstract has not been submitted
Authors
J. T. Lokemoen, D. H. Johnson
Breeding bird populations of selected grasslands in east-central North Dakota -- 1975 - Kentucky blue grass prairie and mixed prairie I-V
Abstract has not been submitted
Authors
D. H. Johnson
Estimating survival rates from banding of adult and juvenile birds
The restrictive assumptions required by most available methods for estimating survival probabilities render them unsuitable for analyzing real banding data. A model is proposed which allows survival rates and recovery rates to vary with the calendar year, and also allows juveniles to have rates different from adults. In addition to survival rates and recovery rates, the differential vulnerability
Authors
D. H. Johnson
Breeding bird populations of selected grasslands in east-central North Dakota -- 1974 - Kentucky bluegrass prairie and mixed prairie I-V, VII
Abstract has not been submitted
Authors
D. H. Johnson
A preliminary classification of wetland plant communities in north-central Minnesota
A classification of wetland plant communities was developed for a study area in north-central Minnesota in order to analyze data on waterfowl use of habitat that were gathered by radio telemetry. The classification employs features of several earlier classifications in addition to new classes for bogs and lakeshore communities. Brief descriptions are given for each community, and the important pla
Authors
L.M. Cowardin, D. H. Johnson
Thirty-seventh breeding bird census - mixed prairie
Abstract has not been submitted
Authors
D. H. Johnson, G.L. Krapu
A preliminary classification of wetland plant communities in north-central Minnesota
No abstract available.
Authors
Lewis M. Cowardin, Douglas H. Johnson
The age distribution of environmental periodicals
Abstract has not been submitted
Authors
D. H. Johnson
Racial composition of migrant populations of sandhill cranes in the northern plains states
Abstract has not been submitted
Authors
D. H. Johnson, R. E. Stewart
Science and Products
Filter Total Items: 310
Cardinal and mockingbird in Jamestown, North Dakota
Abstract has not been submitted
Authors
D. H. Johnson, J.E. Johnson
Age determination of female redhead ducks
Eighty-seven fall-collected wings from female redhead ducks (Aythya americana) were assigned to the adult or juvenile group based on 'tertial' and 'tertial covert' shape and wear. To obtain spring age-related characters from these fall-collected groupings, we considered parameters of flight feathers retained until after the first breeding season. Parameters measured included: markings on and width
Authors
C.W. Dane, D. H. Johnson
Fitting Richards' curve to data of diverse origins
Published techniques for fitting data to nonlinear growth curves are briefly reviewed, most techniques require knowledge of the shape of the curve. A flexible growth curve developed by Richards (1959) is discussed as an alternative when the shape is unknown. The shape of this curve is governed by a specific parameter which can be estimated from the data. We describe in detail the fitting of a dive
Authors
D. H. Johnson, A. B. Sargeant, S.H. Allen
Migration of birds in North Dakota during fall 1974
Abstract has not been submitted
Authors
J. T. Lokemoen, D. H. Johnson
Breeding bird populations of selected grasslands in east-central North Dakota -- 1975 - Kentucky blue grass prairie and mixed prairie I-V
Abstract has not been submitted
Authors
D. H. Johnson
Estimating survival rates from banding of adult and juvenile birds
The restrictive assumptions required by most available methods for estimating survival probabilities render them unsuitable for analyzing real banding data. A model is proposed which allows survival rates and recovery rates to vary with the calendar year, and also allows juveniles to have rates different from adults. In addition to survival rates and recovery rates, the differential vulnerability
Authors
D. H. Johnson
Breeding bird populations of selected grasslands in east-central North Dakota -- 1974 - Kentucky bluegrass prairie and mixed prairie I-V, VII
Abstract has not been submitted
Authors
D. H. Johnson
A preliminary classification of wetland plant communities in north-central Minnesota
A classification of wetland plant communities was developed for a study area in north-central Minnesota in order to analyze data on waterfowl use of habitat that were gathered by radio telemetry. The classification employs features of several earlier classifications in addition to new classes for bogs and lakeshore communities. Brief descriptions are given for each community, and the important pla
Authors
L.M. Cowardin, D. H. Johnson
Thirty-seventh breeding bird census - mixed prairie
Abstract has not been submitted
Authors
D. H. Johnson, G.L. Krapu
A preliminary classification of wetland plant communities in north-central Minnesota
No abstract available.
Authors
Lewis M. Cowardin, Douglas H. Johnson
The age distribution of environmental periodicals
Abstract has not been submitted
Authors
D. H. Johnson
Racial composition of migrant populations of sandhill cranes in the northern plains states
Abstract has not been submitted
Authors
D. H. Johnson, R. E. Stewart