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: 311
American avocet nesting on constructed islands in North Dakota
Abstract has not been submitted
Authors
A.L. Dahl, D. H. Johnson, L.D. Igl, K.L. Baer, M. A. Johnson, R. E. Reynolds
Sampling designs for carnivore scent-station surveys
Scent stations usually are deployed in clusters to expedite data collection and increase the number of stations that can be operated for a given cost. Presumed benefits of cluster sampling may not be realized, however, unless cluster sizes are chosen with respect to sampling variation within and among clusters. To encourage and facilitate the use of efficient designs and reporting standards, we us
Authors
G.A. Sargeant, D. H. Johnson, W. E. Berg
Evaluation of landscape models for wolverines in the interior Northwest, United States of America
The wolverine (Gulo gulo) is an uncommon, wide-ranging carnivore of conservation concern. We evaluated performance of landscape models for wolverines within their historical range at 2 scales in the interior Northwest based on recent observations (n = 421) from Washington, Oregon, Idaho, and Montana. At the subbasin scale, simple overlays of habitat and road-density classes were effective in predi
Authors
M.M. Rowland, M.J. Wisdom, D. H. Johnson, B.C. Wales, J.P. Copeland, F.B. Edelmann
Brown-headed cowbirds in grasslands: Their habitats, hosts, and response to management
The brown-headed cowbird (Molothrus ater) is an obligate brood parasite whose numbers have increased in recent decades to the potential detriment of the species that they parasitize. Thus, most management efforts focus on discouraging brown-headed cowbird parasitism or controlling brown-headed cowbird populations. Keys to discouraging cowbird parasitism or controlling populations of brown-headed c
Authors
Jill A. Shaffer, Christopher M. Goldade, Meghan F. Dinkins, Douglas H. Johnson, Lawrence D. Igl, Betty R. Euliss
Evaluation of landscape models for wolverines in the interior northwest, United States of America
The wolverine (Gulo gulo) is an uncommon, wide-ranging carnivore of conservation concern. We evaluated performance of landscape models for wolverines within their historical range at 2 scales in the interior Northwest based on recent observations (n = 421) from Washington, Oregon, Idaho, and Montana. At the subbasin scale, simple overlays of habitat and road-density classes were effective in predi
Authors
M.M. Rowland, M.J. Wisdom, D. H. Johnson, B.C. Wales, J.P. Copeland, F.B. Edelmann
Effects of leafy spurge infestation on grassland birds
Grassland bird populations are declining. Invasive plant species may be contributing to these declines by altering habitat quality. However, the effects of invasive plants on grassland birds are largely unknown. Leafy spurge (Euphorbia esula) is an exotic, invasive weed in the northern Great Plains. We examined the effects of leafy spurge infestation on densities of breeding birds, nest-site selec
Authors
D.M. Scheiman, E.K. Bollinger, D. H. Johnson
Assemblages of breeding birds as indicators of grassland condition
We developed a measure of biological integrity for grasslands (GI) based on the most influential habitat types in the Prairie Pothole Region of North Dakota. GI is based on proportions of habitat types and the relationships of these habitat types to breeding birds. Habitat types were identified by digital aerial photography, verified on the ground, and quantified using GIS. We then developed an in
Authors
S.F. Browder, D. H. Johnson, I. J. Ball
Grassland bird communities and environmental health: The role of landscape features
Ecosystems throughout the world are imperiled by myriad anthropogenic factors. It is critical to develop tools for evaluating and monitoring the health or integrity of various ecosystems. Because of the broad scale of the problem, the urgency to address informational needs, and the limited financial resources committed to the problem, relatively inexpensive tools that encompass large areas are esp
Authors
Douglas H. Johnson, S.F. Browder, Maiken Winter
Effects of management practices on grassland birds: Nelson's Sharp-tailed Sparrow
Information on the habitat requirements and effects of habitat management on grassland birds were summarized from information in more than 5,500 published and unpublished papers. A range map is provided to indicate the relative densities of the species in North America, based on Breeding Bird Survey (BBS) data. Although birds frequently are observed outside the breeding range indicated, the maps a
Authors
Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Paul A. Rabie, Betty R. Euliss
The importance of replication in wildlife research
Wildlife ecology and management studies have been widely criticized for deficiencies in design or analysis. Manipulative experiments--with controls, randomization, and replication in space and time--provide powerful ways of learning about natural systems and establishing causal relationships, but such studies are rare in our field. Observational studies and sample surveys are more common; they als
Authors
D. H. Johnson
Discussion comments on 'Evaluation of some random effects methodology applicable to bird ringing data' by Burnham and White
No abstract available.
Authors
Douglas H. Johnson
Evaluation of management practices in wetland meadows at Grays Lake National Wildlife Refuge, Idaho, 1997-2000
We assessed the relative values of 4 management practices (idle, late season grazing, fall prescribed burning, and rotation of idle and summer grazing) to biotic resources of the grassland-wetland meadow ecosystem at Grays Lake during 1997-2000. Three replicates of each treatment were randomly assigned to 12 experimental units that bordered the deep emergent marsh. Biotic factors examined include
Authors
J. E. Austin, W.H. Pyle, J.R. Keough, D. H. Johnson
Science and Products
Filter Total Items: 311
American avocet nesting on constructed islands in North Dakota
Abstract has not been submitted
Authors
A.L. Dahl, D. H. Johnson, L.D. Igl, K.L. Baer, M. A. Johnson, R. E. Reynolds
Sampling designs for carnivore scent-station surveys
Scent stations usually are deployed in clusters to expedite data collection and increase the number of stations that can be operated for a given cost. Presumed benefits of cluster sampling may not be realized, however, unless cluster sizes are chosen with respect to sampling variation within and among clusters. To encourage and facilitate the use of efficient designs and reporting standards, we us
Authors
G.A. Sargeant, D. H. Johnson, W. E. Berg
Evaluation of landscape models for wolverines in the interior Northwest, United States of America
The wolverine (Gulo gulo) is an uncommon, wide-ranging carnivore of conservation concern. We evaluated performance of landscape models for wolverines within their historical range at 2 scales in the interior Northwest based on recent observations (n = 421) from Washington, Oregon, Idaho, and Montana. At the subbasin scale, simple overlays of habitat and road-density classes were effective in predi
Authors
M.M. Rowland, M.J. Wisdom, D. H. Johnson, B.C. Wales, J.P. Copeland, F.B. Edelmann
Brown-headed cowbirds in grasslands: Their habitats, hosts, and response to management
The brown-headed cowbird (Molothrus ater) is an obligate brood parasite whose numbers have increased in recent decades to the potential detriment of the species that they parasitize. Thus, most management efforts focus on discouraging brown-headed cowbird parasitism or controlling brown-headed cowbird populations. Keys to discouraging cowbird parasitism or controlling populations of brown-headed c
Authors
Jill A. Shaffer, Christopher M. Goldade, Meghan F. Dinkins, Douglas H. Johnson, Lawrence D. Igl, Betty R. Euliss
Evaluation of landscape models for wolverines in the interior northwest, United States of America
The wolverine (Gulo gulo) is an uncommon, wide-ranging carnivore of conservation concern. We evaluated performance of landscape models for wolverines within their historical range at 2 scales in the interior Northwest based on recent observations (n = 421) from Washington, Oregon, Idaho, and Montana. At the subbasin scale, simple overlays of habitat and road-density classes were effective in predi
Authors
M.M. Rowland, M.J. Wisdom, D. H. Johnson, B.C. Wales, J.P. Copeland, F.B. Edelmann
Effects of leafy spurge infestation on grassland birds
Grassland bird populations are declining. Invasive plant species may be contributing to these declines by altering habitat quality. However, the effects of invasive plants on grassland birds are largely unknown. Leafy spurge (Euphorbia esula) is an exotic, invasive weed in the northern Great Plains. We examined the effects of leafy spurge infestation on densities of breeding birds, nest-site selec
Authors
D.M. Scheiman, E.K. Bollinger, D. H. Johnson
Assemblages of breeding birds as indicators of grassland condition
We developed a measure of biological integrity for grasslands (GI) based on the most influential habitat types in the Prairie Pothole Region of North Dakota. GI is based on proportions of habitat types and the relationships of these habitat types to breeding birds. Habitat types were identified by digital aerial photography, verified on the ground, and quantified using GIS. We then developed an in
Authors
S.F. Browder, D. H. Johnson, I. J. Ball
Grassland bird communities and environmental health: The role of landscape features
Ecosystems throughout the world are imperiled by myriad anthropogenic factors. It is critical to develop tools for evaluating and monitoring the health or integrity of various ecosystems. Because of the broad scale of the problem, the urgency to address informational needs, and the limited financial resources committed to the problem, relatively inexpensive tools that encompass large areas are esp
Authors
Douglas H. Johnson, S.F. Browder, Maiken Winter
Effects of management practices on grassland birds: Nelson's Sharp-tailed Sparrow
Information on the habitat requirements and effects of habitat management on grassland birds were summarized from information in more than 5,500 published and unpublished papers. A range map is provided to indicate the relative densities of the species in North America, based on Breeding Bird Survey (BBS) data. Although birds frequently are observed outside the breeding range indicated, the maps a
Authors
Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Paul A. Rabie, Betty R. Euliss
The importance of replication in wildlife research
Wildlife ecology and management studies have been widely criticized for deficiencies in design or analysis. Manipulative experiments--with controls, randomization, and replication in space and time--provide powerful ways of learning about natural systems and establishing causal relationships, but such studies are rare in our field. Observational studies and sample surveys are more common; they als
Authors
D. H. Johnson
Discussion comments on 'Evaluation of some random effects methodology applicable to bird ringing data' by Burnham and White
No abstract available.
Authors
Douglas H. Johnson
Evaluation of management practices in wetland meadows at Grays Lake National Wildlife Refuge, Idaho, 1997-2000
We assessed the relative values of 4 management practices (idle, late season grazing, fall prescribed burning, and rotation of idle and summer grazing) to biotic resources of the grassland-wetland meadow ecosystem at Grays Lake during 1997-2000. Three replicates of each treatment were randomly assigned to 12 experimental units that bordered the deep emergent marsh. Biotic factors examined include
Authors
J. E. Austin, W.H. Pyle, J.R. Keough, D. H. Johnson