Gary Krapu, PhD (Former Employee)
Science and Products
Filter Total Items: 105
Population genetic structure in migratory sandhill cranes and the role of Pleistocene glaciations Population genetic structure in migratory sandhill cranes and the role of Pleistocene glaciations
Previous studies of migratory sandhill cranes (Grus canadensis) have made significant progress explaining evolution of this group at the species scale, but have been unsuccessful in explaining the geographically partitioned variation in morphology seen on the population scale. The objectives of this study were to assess the population structure and gene flow patterns among migratory...
Authors
K.L. Jones, Gary L. Krapu, D.A. Brandt, M.V. Ashley
Does presence of permanent fresh water affect recruitment in prairie-nesting dabbling ducks? Does presence of permanent fresh water affect recruitment in prairie-nesting dabbling ducks?
In the Prairie Pothole Region (PPR) of North Dakota, USA, American mink (Mustela vison) are a major predator of ducklings. Mink populations plummet during severe droughts, but some mink survive where permanent fresh water is available. In 1992–1993, we evaluated whether development of a permanent water body, the 125-km McClusky Canal (MC), had affected survival of gadwall (Anas strepera)...
Authors
Gary L. Krapu, P.J. Pietz, D.A. Brandt, R. R. Cox
Less waste corn, more land in soybeans, and the switch to genetically modified crops: Trends with important implications for wildlife management Less waste corn, more land in soybeans, and the switch to genetically modified crops: Trends with important implications for wildlife management
American agriculture has provided abundant high-energy foods for migratory and resident wildlife populations since the onset of modern wildlife management. Responding to anecdotal evidence that corn residues are declining in cropland, we remeasured waste corn post-harvest in the Central Platte River Valley (CPRV) of Nebraska during 1997 and 1998 to compare with 1978. Post-harvest waste...
Authors
Gary L. Krapu, D.A. Brandt, R. R. Cox
Patterns of variation in clutch sizes in a guild of temperate-nesting dabbling ducks Patterns of variation in clutch sizes in a guild of temperate-nesting dabbling ducks
Clutch sizes of temperate-nesting dabbling ducks vary widely within and between years. Biologists have long been interested in why such patterns exist but have had difficulty separating intrinsic effects from environmental influences. In an attempt to gain greater insight into the roles of intrinsic and environmental influences on clutch sizes of dabbling ducks, we compared clutch-size...
Authors
Gary L. Krapu, R. E. Reynolds, G.A. Sargeant, R.W. Renner
Less waste corn, more land in soybeans, and the switch to genetically modified crops: Trends with important implications to wildlife management Less waste corn, more land in soybeans, and the switch to genetically modified crops: Trends with important implications to wildlife management
American agriculture has provided abundant high-energy foods for migratory and resident wildlife populations since the onset of modern wildlife management. Responding to anecdotal evidence that corn residues are declining in cropland, we remeasured waste corn postharvest in the Central Platte River Valley (CPRV) of Nebraska during 1997 and 1998 to compare with 1978. Post-harvest waste...
Authors
Gary L. Krapu, D.A. Brandt, R. R. Cox
[Book review] Prairie Wetland Ecology--The Contribution of the Marsh Ecology Research Program, edited by H. R. Murkin, A. G. van der Valk, and W. R. Clark [Book review] Prairie Wetland Ecology--The Contribution of the Marsh Ecology Research Program, edited by H. R. Murkin, A. G. van der Valk, and W. R. Clark
Review of: Prairie Wetland Ecology: The Contribution of the Marsh Ecology Research Program by Henry R. Murkin, Arnold G. van der Valk, and William R. Clark, eds.
Authors
Gary L. Krapu
Science and Products
Filter Total Items: 105
Population genetic structure in migratory sandhill cranes and the role of Pleistocene glaciations Population genetic structure in migratory sandhill cranes and the role of Pleistocene glaciations
Previous studies of migratory sandhill cranes (Grus canadensis) have made significant progress explaining evolution of this group at the species scale, but have been unsuccessful in explaining the geographically partitioned variation in morphology seen on the population scale. The objectives of this study were to assess the population structure and gene flow patterns among migratory...
Authors
K.L. Jones, Gary L. Krapu, D.A. Brandt, M.V. Ashley
Does presence of permanent fresh water affect recruitment in prairie-nesting dabbling ducks? Does presence of permanent fresh water affect recruitment in prairie-nesting dabbling ducks?
In the Prairie Pothole Region (PPR) of North Dakota, USA, American mink (Mustela vison) are a major predator of ducklings. Mink populations plummet during severe droughts, but some mink survive where permanent fresh water is available. In 1992–1993, we evaluated whether development of a permanent water body, the 125-km McClusky Canal (MC), had affected survival of gadwall (Anas strepera)...
Authors
Gary L. Krapu, P.J. Pietz, D.A. Brandt, R. R. Cox
Less waste corn, more land in soybeans, and the switch to genetically modified crops: Trends with important implications for wildlife management Less waste corn, more land in soybeans, and the switch to genetically modified crops: Trends with important implications for wildlife management
American agriculture has provided abundant high-energy foods for migratory and resident wildlife populations since the onset of modern wildlife management. Responding to anecdotal evidence that corn residues are declining in cropland, we remeasured waste corn post-harvest in the Central Platte River Valley (CPRV) of Nebraska during 1997 and 1998 to compare with 1978. Post-harvest waste...
Authors
Gary L. Krapu, D.A. Brandt, R. R. Cox
Patterns of variation in clutch sizes in a guild of temperate-nesting dabbling ducks Patterns of variation in clutch sizes in a guild of temperate-nesting dabbling ducks
Clutch sizes of temperate-nesting dabbling ducks vary widely within and between years. Biologists have long been interested in why such patterns exist but have had difficulty separating intrinsic effects from environmental influences. In an attempt to gain greater insight into the roles of intrinsic and environmental influences on clutch sizes of dabbling ducks, we compared clutch-size...
Authors
Gary L. Krapu, R. E. Reynolds, G.A. Sargeant, R.W. Renner
Less waste corn, more land in soybeans, and the switch to genetically modified crops: Trends with important implications to wildlife management Less waste corn, more land in soybeans, and the switch to genetically modified crops: Trends with important implications to wildlife management
American agriculture has provided abundant high-energy foods for migratory and resident wildlife populations since the onset of modern wildlife management. Responding to anecdotal evidence that corn residues are declining in cropland, we remeasured waste corn postharvest in the Central Platte River Valley (CPRV) of Nebraska during 1997 and 1998 to compare with 1978. Post-harvest waste...
Authors
Gary L. Krapu, D.A. Brandt, R. R. Cox
[Book review] Prairie Wetland Ecology--The Contribution of the Marsh Ecology Research Program, edited by H. R. Murkin, A. G. van der Valk, and W. R. Clark [Book review] Prairie Wetland Ecology--The Contribution of the Marsh Ecology Research Program, edited by H. R. Murkin, A. G. van der Valk, and W. R. Clark
Review of: Prairie Wetland Ecology: The Contribution of the Marsh Ecology Research Program by Henry R. Murkin, Arnold G. van der Valk, and William R. Clark, eds.
Authors
Gary L. Krapu