Gary Krapu, PhD
Dr. Gary Krapu is a Wildlife Biologist (Emeritus) at the USGS Northern Prairie Wildlife Research Center in Jamestown, North Dakota.
Science and Products
Filter Total Items: 106
Factors limiting mallard brood survival in prairie pothole landscapes
In order to estimate mallard (Anas platyrhynchos) production from managed and unmanaged lands, waterfowl biologists need measurable predictors of brood survival. We evaluated effects of percent of seasonal basins holding water (WETSEAS), percent of upland landscape in perennial cover (PERNCOVER), rainfall (RAIN), daily minimum ambient temperature (TMIN), hatch date (HATCHDATE), brood age (BA; 0-7
Authors
Gary L. Krapu, Pamela J. Pietz, David A. Brandt, Robert R. Cox
Satellite telemetry--a promising tool for addressing information needs on sandhill cranes
Abstract has not been submitted
Authors
G.L. Krapu, D.A. Brandt
Wetland use, settling patterns, and recruitment in mallards
The correlation between number of May ponds in the Prairie Pothole Region (PPR) of North America and size of the continental mallard (Anas platyrhynchos) breeding population the following spring weakened from the 1950s to the 1980s, suggesting possible changes in suitability of prairie ponds for meeting reproductive needs. We studied wetland use and preferences of radioequipped female mallards by
Authors
Gary L. Krapu, Raymond J. Greenwood, Chris P. Dwyer, Kathy M. Kraft, Lewis M. Cowardin
Exposure of wild waterfowl to Mycoplasma anatis
We developed an ELISA procedure to assess the presence of M. Anatis-specific serum antibody in ducks. Sera from exposed and unexposed Pekin ducks (Anas platyrhynchos) were used to standardize tile ELISA and to establish reference ranges to classify ELISA results as exposed or not exposed. We conducted serological surveys of female waterfowl in the central and eastern United States between 1988 and
Authors
M. D. Samuel, Diana R. Goldberg, C. B. Thomas, P. Sharp, J.R. Robb, G.L. Krapu, B.N. Nersessian, K.P. Kenow, C. E. Korschgen, W.H. Chipley, M.J. Conroy
Effects of a legal drain clean-out on wetlands and waterbirds: a recent case history
Repairs to legal drains in the United States may be regulated to protect adjacent wetlands under Section 404 of the Federal Water Pollution Control Act, commonly known as the Clean Water Act (CWA). However, few studies have examined effects of legal drain clean-outs on adjacent wetlands and associated migratory waterbird populations. I compare water regimes, cover-to-open water ratios, and waterbi
Authors
Gary L. Krapu
Spring-staging ecology of midcontinent greater white-fronted geese
A major part of the midcontinent greater white-fronted goose (Anser albifrons) population stages for several weeks in spring in the Rainwater Basin Area (RBA) of south-central Nebraska where substantial mortality from disease occurs periodically. Effective management of this population requires better data on use of habitat, vulnerability to disease, and the role of staging areas in migration and
Authors
Gary Krapu, Kenneth J. Reinecke, Dennis G. Jorde, S. G. Simpson
Modified transmitter attachment method for adult ducks
The value of radio telemetry for waterfowl research depends on the availability of suitable methods of attaching transmitters. In previous studies, external transmitters attached to adult Mallards (Anas platyrhynchos) with sutures and glue did not stay on birds reliably. In an attempt to improve transmitter retention, a method of attachment was tested in which 4-g transmitters were attached mid-do
Authors
P.J. Pietz, D.A. Brandt, G.L. Krapu, D. A. Buhl
The occurrence of mycoplasmas in selected wild North American waterfowl
We determined the prevalence of mycoplasma infection in breeding mallard (Anas platyrhynchos) and canvasback (Aythya valisineria) hens and their broods from the central United States (1988 to 1990); and wintering American black duck (Anas rubripes) and mallard hens from the eastern United States (1990 to 1993). Mycoplasmas were isolated by culturing tracheal swabs from 656 live birds and tissue sa
Authors
Diana R. Goldberg, M. D. Samuel, C. B. Thomas, P. Sharp, G.L. Krapu, J.R. Robb, K.P. Kenow, C. E. Korschgen, W.H. Chipley, M.J. Conroy, S.H. Kleven
Effects of predator exclosure design on duck brood movements
No abstract available.
Authors
P.J. Pietz, G.L. Krapu
Communal roosting and foraging behavior of staging sandhill cranes
Each spring more than 300,000 Sandhill Cranes (Grus canadensis) roost communally at night in river channels in the Platte River Valley of Nebraska and disperse at dawn to forage in agricultural fields. Cranes with central roosts had activity ranges double the size of those with peripheral roosts; 42% of the birds changed activity ranges prior to the onset of migration. Minimum daily flight d
Authors
D. W. Sparling, G.L. Krapu
Science and Products
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Filter Total Items: 106
Factors limiting mallard brood survival in prairie pothole landscapes
In order to estimate mallard (Anas platyrhynchos) production from managed and unmanaged lands, waterfowl biologists need measurable predictors of brood survival. We evaluated effects of percent of seasonal basins holding water (WETSEAS), percent of upland landscape in perennial cover (PERNCOVER), rainfall (RAIN), daily minimum ambient temperature (TMIN), hatch date (HATCHDATE), brood age (BA; 0-7AuthorsGary L. Krapu, Pamela J. Pietz, David A. Brandt, Robert R. CoxSatellite telemetry--a promising tool for addressing information needs on sandhill cranes
Abstract has not been submittedAuthorsG.L. Krapu, D.A. BrandtWetland use, settling patterns, and recruitment in mallards
The correlation between number of May ponds in the Prairie Pothole Region (PPR) of North America and size of the continental mallard (Anas platyrhynchos) breeding population the following spring weakened from the 1950s to the 1980s, suggesting possible changes in suitability of prairie ponds for meeting reproductive needs. We studied wetland use and preferences of radioequipped female mallards byAuthorsGary L. Krapu, Raymond J. Greenwood, Chris P. Dwyer, Kathy M. Kraft, Lewis M. CowardinExposure of wild waterfowl to Mycoplasma anatis
We developed an ELISA procedure to assess the presence of M. Anatis-specific serum antibody in ducks. Sera from exposed and unexposed Pekin ducks (Anas platyrhynchos) were used to standardize tile ELISA and to establish reference ranges to classify ELISA results as exposed or not exposed. We conducted serological surveys of female waterfowl in the central and eastern United States between 1988 andAuthorsM. D. Samuel, Diana R. Goldberg, C. B. Thomas, P. Sharp, J.R. Robb, G.L. Krapu, B.N. Nersessian, K.P. Kenow, C. E. Korschgen, W.H. Chipley, M.J. ConroyEffects of a legal drain clean-out on wetlands and waterbirds: a recent case history
Repairs to legal drains in the United States may be regulated to protect adjacent wetlands under Section 404 of the Federal Water Pollution Control Act, commonly known as the Clean Water Act (CWA). However, few studies have examined effects of legal drain clean-outs on adjacent wetlands and associated migratory waterbird populations. I compare water regimes, cover-to-open water ratios, and waterbiAuthorsGary L. KrapuSpring-staging ecology of midcontinent greater white-fronted geese
A major part of the midcontinent greater white-fronted goose (Anser albifrons) population stages for several weeks in spring in the Rainwater Basin Area (RBA) of south-central Nebraska where substantial mortality from disease occurs periodically. Effective management of this population requires better data on use of habitat, vulnerability to disease, and the role of staging areas in migration andAuthorsGary Krapu, Kenneth J. Reinecke, Dennis G. Jorde, S. G. SimpsonModified transmitter attachment method for adult ducks
The value of radio telemetry for waterfowl research depends on the availability of suitable methods of attaching transmitters. In previous studies, external transmitters attached to adult Mallards (Anas platyrhynchos) with sutures and glue did not stay on birds reliably. In an attempt to improve transmitter retention, a method of attachment was tested in which 4-g transmitters were attached mid-doAuthorsP.J. Pietz, D.A. Brandt, G.L. Krapu, D. A. BuhlThe occurrence of mycoplasmas in selected wild North American waterfowl
We determined the prevalence of mycoplasma infection in breeding mallard (Anas platyrhynchos) and canvasback (Aythya valisineria) hens and their broods from the central United States (1988 to 1990); and wintering American black duck (Anas rubripes) and mallard hens from the eastern United States (1990 to 1993). Mycoplasmas were isolated by culturing tracheal swabs from 656 live birds and tissue saAuthorsDiana R. Goldberg, M. D. Samuel, C. B. Thomas, P. Sharp, G.L. Krapu, J.R. Robb, K.P. Kenow, C. E. Korschgen, W.H. Chipley, M.J. Conroy, S.H. KlevenEffects of predator exclosure design on duck brood movements
No abstract available.AuthorsP.J. Pietz, G.L. KrapuCommunal roosting and foraging behavior of staging sandhill cranes
Each spring more than 300,000 Sandhill Cranes (Grus canadensis) roost communally at night in river channels in the Platte River Valley of Nebraska and disperse at dawn to forage in agricultural fields. Cranes with central roosts had activity ranges double the size of those with peripheral roosts; 42% of the birds changed activity ranges prior to the onset of migration. Minimum daily flight dAuthorsD. W. Sparling, G.L. Krapu