Douglas Johnson (Former Employee)
Science and Products
Filter Total Items: 318
Migration and habitat preferences of Swainson's Hawks at an autumn stopover site in northwestern Texas Migration and habitat preferences of Swainson's Hawks at an autumn stopover site in northwestern Texas
Unlike most raptors, the Swainson's Hawk (Buteo swainsoni) migrates long distances between breeding and wintering ranges, which elevates the importance of stopover sites for foraging. We conducted three years of fall surveys in the Southern High Plains of Texas. Migrant Swainson's Hawks moved through the area mostly between July and mid-October, peaking in September. Subadults tended to...
Authors
Carroll D. Littlefield, Douglas H. Johnson
Monitoring that matters Monitoring that matters
Monitoring is a critically important activity for assessing the status of a system, such as the health of an individual, the balance in one's checking account, profits and losses of a business, the economic activity of a nation, or the size of an animal population. Monitoring is especially vital for evaluating changes in the system associated with specific known impacts occurring to the...
Authors
Douglas H. Johnson
The treatment of missing data in long-term monitoring programs The treatment of missing data in long-term monitoring programs
No abstract available.
Authors
Douglas H. Johnson, Michael B. Soma
Aerial surveys adjusted by ground surveys to estimate area occupied by black-tailed prairie dog colonies Aerial surveys adjusted by ground surveys to estimate area occupied by black-tailed prairie dog colonies
Aerial surveys using line-intercept methods are one approach to estimate the extent of prairie dog colonies in a large geographic area. Although black-tailed prairie dogs (Cynomys ludovicianus) construct conspicuous mounds at burrow openings, aerial observers have difficulty discriminating between areas with burrows occupied by prairie dogs (colonies) versus areas of uninhabited burrows
Authors
John G. Sidle, David J. Augustine, Douglas H. Johnson, Sterling D. Miller, Jack F. Cully, Richard P. Reading
Geographic distribution of the mid-continent population of sandhill cranes and related management applications Geographic distribution of the mid-continent population of sandhill cranes and related management applications
The Mid-continent Population (MCP) of sandhill cranes (Grus canadensis) is widely hunted in North America and is separated into the Gulf Coast Subpopulation and Western Subpopulation for management purposes. Effective harvest management of the MCP requires detailed knowledge of breeding distribution of subspecies and subpopulations, chronology of their use of fall staging areas and...
Authors
Gary L. Krapu, David A. Brandt, Kenneth L. Jones, Douglas H. Johnson
Conservation of greater sage-grouse- a synthesis of current trends and future management Conservation of greater sage-grouse- a synthesis of current trends and future management
Recent analyses of Greater Sage-Grouse (Centrocercus urophasianus) populations indicate substantial declines in many areas but relatively stable populations in other portions of the species? range. Sagebrush (Artemisia spp.) habitats neces-sary to support sage-grouse are being burned by large wildfires, invaded by nonnative plants, and developed for energy resources (gas, oil, and wind)
Authors
John W. Connelly, Steven T. Knick, Clait E. Braun, William L. Baker, Erik A. Beever, Thomas J. Christiansen, Kevin E. Doherty, Edward O. Garton, Christian A. Hagen, Steven E. Hanser, Douglas H. Johnson, Matthias Leu, Richard F. Miller, David E. Naugle, Sara J. Oyler-McCance, David A. Pyke, Kerry P. Reese, Michael A. Schroeder, San J. Stiver, Brett L. Walker, Michael J. Wisdorn
Science and Products
Filter Total Items: 318
Migration and habitat preferences of Swainson's Hawks at an autumn stopover site in northwestern Texas Migration and habitat preferences of Swainson's Hawks at an autumn stopover site in northwestern Texas
Unlike most raptors, the Swainson's Hawk (Buteo swainsoni) migrates long distances between breeding and wintering ranges, which elevates the importance of stopover sites for foraging. We conducted three years of fall surveys in the Southern High Plains of Texas. Migrant Swainson's Hawks moved through the area mostly between July and mid-October, peaking in September. Subadults tended to...
Authors
Carroll D. Littlefield, Douglas H. Johnson
Monitoring that matters Monitoring that matters
Monitoring is a critically important activity for assessing the status of a system, such as the health of an individual, the balance in one's checking account, profits and losses of a business, the economic activity of a nation, or the size of an animal population. Monitoring is especially vital for evaluating changes in the system associated with specific known impacts occurring to the...
Authors
Douglas H. Johnson
The treatment of missing data in long-term monitoring programs The treatment of missing data in long-term monitoring programs
No abstract available.
Authors
Douglas H. Johnson, Michael B. Soma
Aerial surveys adjusted by ground surveys to estimate area occupied by black-tailed prairie dog colonies Aerial surveys adjusted by ground surveys to estimate area occupied by black-tailed prairie dog colonies
Aerial surveys using line-intercept methods are one approach to estimate the extent of prairie dog colonies in a large geographic area. Although black-tailed prairie dogs (Cynomys ludovicianus) construct conspicuous mounds at burrow openings, aerial observers have difficulty discriminating between areas with burrows occupied by prairie dogs (colonies) versus areas of uninhabited burrows
Authors
John G. Sidle, David J. Augustine, Douglas H. Johnson, Sterling D. Miller, Jack F. Cully, Richard P. Reading
Geographic distribution of the mid-continent population of sandhill cranes and related management applications Geographic distribution of the mid-continent population of sandhill cranes and related management applications
The Mid-continent Population (MCP) of sandhill cranes (Grus canadensis) is widely hunted in North America and is separated into the Gulf Coast Subpopulation and Western Subpopulation for management purposes. Effective harvest management of the MCP requires detailed knowledge of breeding distribution of subspecies and subpopulations, chronology of their use of fall staging areas and...
Authors
Gary L. Krapu, David A. Brandt, Kenneth L. Jones, Douglas H. Johnson
Conservation of greater sage-grouse- a synthesis of current trends and future management Conservation of greater sage-grouse- a synthesis of current trends and future management
Recent analyses of Greater Sage-Grouse (Centrocercus urophasianus) populations indicate substantial declines in many areas but relatively stable populations in other portions of the species? range. Sagebrush (Artemisia spp.) habitats neces-sary to support sage-grouse are being burned by large wildfires, invaded by nonnative plants, and developed for energy resources (gas, oil, and wind)
Authors
John W. Connelly, Steven T. Knick, Clait E. Braun, William L. Baker, Erik A. Beever, Thomas J. Christiansen, Kevin E. Doherty, Edward O. Garton, Christian A. Hagen, Steven E. Hanser, Douglas H. Johnson, Matthias Leu, Richard F. Miller, David E. Naugle, Sara J. Oyler-McCance, David A. Pyke, Kerry P. Reese, Michael A. Schroeder, San J. Stiver, Brett L. Walker, Michael J. Wisdorn