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
The Conservation Reserve Program: good for birds of many feathers
No abstract available.
Authors
H.A. Kantrud, Rolf R. Koford, D. H. Johnson, M.D. Schwartz
Bird censuses 116-121: Kentucky bluegrass prairie and mixed prairie I-V
Abstract has not been submitted
Authors
D. H. Johnson, M.D. Schwartz
Incidental catch of marine birds in the north pacific high seas driftnet fisheries in 1990
The incidental take of marine birds was estimated for the following North Pacific driftnet fisheries in 1990: Japanese squid, Japanese large-mesh, Korean squid, and Taiwanese squid and large-mesh combined. The take was estimated by assuming that the data represented a random sample from an unstratified population of all driftnet fisheries in the North Pacific. Estimates for 13 species or species g
Authors
D. H. Johnson, T.L. Shaffer, P.J. Gould
The Conservation Reserve Program: habitat for grassland birds
The Conservation Reserve Program (CRP) has effected major changes to the landscape, especially in the northern Great Plains. Breeding birds have responded dramatically to habitat changes by colonizing CRP fields, often in large numbers. The vegetation in most CRP fields consists of introduced grasses and legumes, along with a variety of weedy species. This paper describes the bird populations foun
Authors
Douglas H. Johnson, Michael D. Schwartz
The Conservation Reserve Program and grassland birds
No abstract available.
Authors
Douglas H. Johnson, Michael D. Schwartz
Population dynamics of breeding waterfowl
No abstract available.
Authors
D. H. Johnson, J. D. Nichols, M.D. Schwartz
Population dynamics of breeding waterfowl
No abstract available.
Authors
D. H. Johnson, J. D. Nichols, M.D. Schwartz
A stochastic population model of mid-continental mallards
No abstract available.
Authors
Rolf R. Koford, J.R. Sauer, D. H. Johnson, J. D. Nichols, M. D. Samuel
Bird censuses 115-120: Kentucky bluegrass prairie and mixed prairie I-V
Abstract has not been submitted
Authors
D. H. Johnson, M.D. Schwartz
A stochastic population model of mid-continental mallards
We developed a simulation model that integrates infonnation on factors affecting the population dynamics of mallards in the mid-continental region of the United States. In the model we vary age, body mass, and reproductive and molt status of simulated females. Females use several types of nesting and foraging habitat in 15 geographic areas. Deterministic and stochastic events cause mortality or at
Authors
Rolf R. Koford, J.R. Sauer, D. H. Johnson, J. D. Nichols, M. D. Samuel
Science and Products
Filter Total Items: 310
The Conservation Reserve Program: good for birds of many feathers
No abstract available.
Authors
H.A. Kantrud, Rolf R. Koford, D. H. Johnson, M.D. Schwartz
Bird censuses 116-121: Kentucky bluegrass prairie and mixed prairie I-V
Abstract has not been submitted
Authors
D. H. Johnson, M.D. Schwartz
Incidental catch of marine birds in the north pacific high seas driftnet fisheries in 1990
The incidental take of marine birds was estimated for the following North Pacific driftnet fisheries in 1990: Japanese squid, Japanese large-mesh, Korean squid, and Taiwanese squid and large-mesh combined. The take was estimated by assuming that the data represented a random sample from an unstratified population of all driftnet fisheries in the North Pacific. Estimates for 13 species or species g
Authors
D. H. Johnson, T.L. Shaffer, P.J. Gould
The Conservation Reserve Program: habitat for grassland birds
The Conservation Reserve Program (CRP) has effected major changes to the landscape, especially in the northern Great Plains. Breeding birds have responded dramatically to habitat changes by colonizing CRP fields, often in large numbers. The vegetation in most CRP fields consists of introduced grasses and legumes, along with a variety of weedy species. This paper describes the bird populations foun
Authors
Douglas H. Johnson, Michael D. Schwartz
The Conservation Reserve Program and grassland birds
No abstract available.
Authors
Douglas H. Johnson, Michael D. Schwartz
Population dynamics of breeding waterfowl
No abstract available.
Authors
D. H. Johnson, J. D. Nichols, M.D. Schwartz
Population dynamics of breeding waterfowl
No abstract available.
Authors
D. H. Johnson, J. D. Nichols, M.D. Schwartz
A stochastic population model of mid-continental mallards
No abstract available.
Authors
Rolf R. Koford, J.R. Sauer, D. H. Johnson, J. D. Nichols, M. D. Samuel
Bird censuses 115-120: Kentucky bluegrass prairie and mixed prairie I-V
Abstract has not been submitted
Authors
D. H. Johnson, M.D. Schwartz
A stochastic population model of mid-continental mallards
We developed a simulation model that integrates infonnation on factors affecting the population dynamics of mallards in the mid-continental region of the United States. In the model we vary age, body mass, and reproductive and molt status of simulated females. Females use several types of nesting and foraging habitat in 15 geographic areas. Deterministic and stochastic events cause mortality or at
Authors
Rolf R. Koford, J.R. Sauer, D. H. Johnson, J. D. Nichols, M. D. Samuel