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
Forty-fourth breeding bird census - Kentucky blue grass prairie and mixed prairie I-V, VIII
Abstract has not been submitted
Authors
D. H. Johnson, J.M. Callow
Determination of age and whelping dates of live red fox pups
Abstract has not been submitted
Authors
A. B. Sargeant, S.H. Allen, D. H. Johnson
Improved population estimates through the use of auxiliary information
When estimating the size of a population of birds, the investigator may have, in addition to an estimator based on a statistical sample, information on one of several auxiliary variables, such as: (1) estimates of the population made on previous occasions, (2) measures of habitat variables associated with the size of the population, and (3) estimates of the population sizes of other species that c
Authors
D. H. Johnson
Summarizing remarks: estimating relative abundance (Part I)
No abstract available.
Authors
D. H. Johnson
Forty-third breeding bird census [On selected prairies in east-central North Dakota -- 1979 - Kentucky blue grass prairie and mixed prairie I-V, VIII
Abstract has not been submitted
Authors
D. H. Johnson, J.M. Callow
The comparison of usage and availability measurements for evaluating resource preference
Modern ecological research often involves the comparison of the usage of habitat types or food items to the availability of those resources to the animal. Widely used methods of determining preference from measurements of usage and availability depend critically on the array of components that the researcher, often with a degree of arbitrariness, deems available to the animal. This paper proposes
Authors
Douglas H. Johnson
Modeling sandhill crane population dynamics
The impact of sport hunting on the Central Flyway population of sandhill cranes (Grus canadensis) has been a subject of controversy for several years. A recent study (Buller 1979) presented new and important information on sandhill crane population dynamics. The present report is intended to incorporate that and other information into a mathematical model for the purpose of assessing the long-rang
Authors
D. H. Johnson
Forty-second breeding bird census - Kentucky blue grass prairie
Abstract has not been submitted
Authors
D. H. Johnson
Estimating nest success: The Mayfield method and an alternative
Mayfield's method for calculating the success of a group of nests is examined in detail. The standard error of his estimator is developed. Mayfield's assumption that destroyed nests are at risk until the midpoint of the interval between visits leads to bias if nests are visited infrequently. A remedy is suggested, the Mayfield-40% method. I also present a competing model, which recognizes that the
Authors
Douglas H. Johnson
Forty-second breeding bird census - mixed prairie I-V and VIII
Abstract has not been submitted
Authors
D. H. Johnson
Science and Products
Filter Total Items: 310
Forty-fourth breeding bird census - Kentucky blue grass prairie and mixed prairie I-V, VIII
Abstract has not been submitted
Authors
D. H. Johnson, J.M. Callow
Determination of age and whelping dates of live red fox pups
Abstract has not been submitted
Authors
A. B. Sargeant, S.H. Allen, D. H. Johnson
Improved population estimates through the use of auxiliary information
When estimating the size of a population of birds, the investigator may have, in addition to an estimator based on a statistical sample, information on one of several auxiliary variables, such as: (1) estimates of the population made on previous occasions, (2) measures of habitat variables associated with the size of the population, and (3) estimates of the population sizes of other species that c
Authors
D. H. Johnson
Summarizing remarks: estimating relative abundance (Part I)
No abstract available.
Authors
D. H. Johnson
Forty-third breeding bird census [On selected prairies in east-central North Dakota -- 1979 - Kentucky blue grass prairie and mixed prairie I-V, VIII
Abstract has not been submitted
Authors
D. H. Johnson, J.M. Callow
The comparison of usage and availability measurements for evaluating resource preference
Modern ecological research often involves the comparison of the usage of habitat types or food items to the availability of those resources to the animal. Widely used methods of determining preference from measurements of usage and availability depend critically on the array of components that the researcher, often with a degree of arbitrariness, deems available to the animal. This paper proposes
Authors
Douglas H. Johnson
Modeling sandhill crane population dynamics
The impact of sport hunting on the Central Flyway population of sandhill cranes (Grus canadensis) has been a subject of controversy for several years. A recent study (Buller 1979) presented new and important information on sandhill crane population dynamics. The present report is intended to incorporate that and other information into a mathematical model for the purpose of assessing the long-rang
Authors
D. H. Johnson
Forty-second breeding bird census - Kentucky blue grass prairie
Abstract has not been submitted
Authors
D. H. Johnson
Estimating nest success: The Mayfield method and an alternative
Mayfield's method for calculating the success of a group of nests is examined in detail. The standard error of his estimator is developed. Mayfield's assumption that destroyed nests are at risk until the midpoint of the interval between visits leads to bias if nests are visited infrequently. A remedy is suggested, the Mayfield-40% method. I also present a competing model, which recognizes that the
Authors
Douglas H. Johnson
Forty-second breeding bird census - mixed prairie I-V and VIII
Abstract has not been submitted
Authors
D. H. Johnson