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: 105
Age determination of mallards
A technique for distinguishing adult from yearling wild mallards (Anas platyrhynchos), from late winter through the nesting season, was developed by applying discriminant analysis procedures to selected wing feather characters of 126 yearlings and 76 adults (2-year-olds) hand-reared from wild eggs during 1974, 1975, and 1977. Average values for feather characters generally increased as the birds a
Authors
G.L. Krapu, Douglas H. Johnson, C.W. Dane
Age-related aspects of mallard reproduction
Abstract has not been submitted
Authors
G.L. Krapu, Harold A. Doty
Productivity of red-winged blackbirds in prairie pothole habitat
Abstract has not been submitted
Authors
G.L. Krapu
Breeding bird populations of selected semipermanent wetlands in south-central North Dakota--1977
Abstract has not been submitted
Authors
G.L. Krapu, R.K. Green
A remote controlled system for capturing nesting waterfowl
Abstract has not been submitted
Authors
C.W. Shaiffer, G.L. Krapu
Pintail reproduction hampered by snowfall and agriculture
Abstract has not been submitted
Authors
G.L. Krapu
Foods of juvenile, brood hen, and post-breeding pintails in North Dakota
No abstract available.
Authors
G.L. Krapu, G.A. Swanson
Yellow-crowned night herons sighted in North Dakota
Abstract has not been submitted
Authors
Dennis G. Jorde, G.L. Krapu, R.K. Green
Experimental responses of mallards and Canada geese to tribromoethanol
Abstract has not been submitted
Authors
G.L. Krapu
Some nutritional aspects of reproduction in prairie nesting pintails
The nutritional significance of invertebrate foods in the diet of breeding hen waterfowl during the period of egg formation is discussed. Proximate, elemental, and amino acid analyses of the principal foods consumed by hen pintails (Anas acuta) during the nesting season indicate the animal foods selected are rich sources of protein and calcium, whereas plant foods tested were low in protein, parti
Authors
G.L. Krapu, G.A. Swanson
Avian mortality from collisions with overhead wires in North Dakota
Abstract has not been submitted
Authors
G.L. Krapu
Science and Products
Filter Total Items: 105
Age determination of mallards
A technique for distinguishing adult from yearling wild mallards (Anas platyrhynchos), from late winter through the nesting season, was developed by applying discriminant analysis procedures to selected wing feather characters of 126 yearlings and 76 adults (2-year-olds) hand-reared from wild eggs during 1974, 1975, and 1977. Average values for feather characters generally increased as the birds a
Authors
G.L. Krapu, Douglas H. Johnson, C.W. Dane
Age-related aspects of mallard reproduction
Abstract has not been submitted
Authors
G.L. Krapu, Harold A. Doty
Productivity of red-winged blackbirds in prairie pothole habitat
Abstract has not been submitted
Authors
G.L. Krapu
Breeding bird populations of selected semipermanent wetlands in south-central North Dakota--1977
Abstract has not been submitted
Authors
G.L. Krapu, R.K. Green
A remote controlled system for capturing nesting waterfowl
Abstract has not been submitted
Authors
C.W. Shaiffer, G.L. Krapu
Pintail reproduction hampered by snowfall and agriculture
Abstract has not been submitted
Authors
G.L. Krapu
Foods of juvenile, brood hen, and post-breeding pintails in North Dakota
No abstract available.
Authors
G.L. Krapu, G.A. Swanson
Yellow-crowned night herons sighted in North Dakota
Abstract has not been submitted
Authors
Dennis G. Jorde, G.L. Krapu, R.K. Green
Experimental responses of mallards and Canada geese to tribromoethanol
Abstract has not been submitted
Authors
G.L. Krapu
Some nutritional aspects of reproduction in prairie nesting pintails
The nutritional significance of invertebrate foods in the diet of breeding hen waterfowl during the period of egg formation is discussed. Proximate, elemental, and amino acid analyses of the principal foods consumed by hen pintails (Anas acuta) during the nesting season indicate the animal foods selected are rich sources of protein and calcium, whereas plant foods tested were low in protein, parti
Authors
G.L. Krapu, G.A. Swanson
Avian mortality from collisions with overhead wires in North Dakota
Abstract has not been submitted
Authors
G.L. Krapu