Gary Krapu, PhD (Former Employee)
Science and Products
Filter Total Items: 105
[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
Factors affecting gadwall brood and duckling survival in prairie pothole landscapes Factors affecting gadwall brood and duckling survival in prairie pothole landscapes
Waterfowl biologists need reliable predictors of brood and duckling survival to accurately estimate recruitment rates. We examined 30-day survival rates of gadwall (Anas strepera) broods (1992-1994) and ducklings (1990-1994) in eastern North Dakota, USA, during years when water conditions ranged from extremely dry to extremely wet. We evaluated effects of several variables on brood...
Authors
P.J. Pietz, Gary L. Krapu, D.A. Brandt, R. R. Cox
Genetic variations in the midcontinental population of sandhill crane, Grus canadenis Genetic variations in the midcontinental population of sandhill crane, Grus canadenis
Three subspecies of sandhill crane (Grus canadensis) are recognized in the Midcontinental population, the lesser (Grus c. canadensis), Canadian (G. c. rowani), and greater (G. c. tabida). Blood samples collected on the population's primary spring staging area in Nebraska, U.S.A., were used to resolve the genetic relationship among these subspecies. Phylogenetic analysis of 27 G...
Authors
Jessica L. Petersen, Richard Bischof, Gary Krapu, Allen L. Szalanski
Does increasing daylength control seasonal changes in clutch sizes of Northern Pintails (Anas acuta)? Does increasing daylength control seasonal changes in clutch sizes of Northern Pintails (Anas acuta)?
We evaluated spatiotemporal variation in clutch sizes of Northern Pintails (pintails; Anas acuta) nesting in California (1985 to 1996), North Dakota (1982 to 1985), Saskatchewan (1982 to 1985) and Alaska (1991 to 1993) to determine whether seasonal declines in clutch size varied in ways that were consistent with a controlling influence of increasing day length. Pintails began nesting in...
Authors
Gary L. Krapu, G.A. Sargeant, A.E.H. Perkins
Factors associated with Autumn rearing of duck broods in temperate North America Factors associated with Autumn rearing of duck broods in temperate North America
Dabbling ducks Genus Anas occasionally nest during mid- and late summer in the Prairie Pothole Region (PPR) of midcontinent North America but little information is available on their Autumn-reared broods or those of other duck genera. Densities, species composition, and wetland habitat use by Autumn reared duck broods (age classes I and II) were determined on randomly distributed...
Authors
Gary L. Krapu, D.A. Brandt, J.A. Beiser
Recommendations for the attachment of satellite transmitters to cranes Recommendations for the attachment of satellite transmitters to cranes
Recent advances in miniaturization of satellite transmitters have resulted in thumb-sized packages weighing less than 30 g. These are smaller than VHF radios routinely mounted on crane leg bands. With this development and with favorable signal reception results, there is no need for, and much to recommend against the continued use of back-pack mounts. We provide details for leg-mount
Authors
D. H. Ellis, P.W. Howey, Gary L. Krapu
Science and Products
Filter Total Items: 105
[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
Factors affecting gadwall brood and duckling survival in prairie pothole landscapes Factors affecting gadwall brood and duckling survival in prairie pothole landscapes
Waterfowl biologists need reliable predictors of brood and duckling survival to accurately estimate recruitment rates. We examined 30-day survival rates of gadwall (Anas strepera) broods (1992-1994) and ducklings (1990-1994) in eastern North Dakota, USA, during years when water conditions ranged from extremely dry to extremely wet. We evaluated effects of several variables on brood...
Authors
P.J. Pietz, Gary L. Krapu, D.A. Brandt, R. R. Cox
Genetic variations in the midcontinental population of sandhill crane, Grus canadenis Genetic variations in the midcontinental population of sandhill crane, Grus canadenis
Three subspecies of sandhill crane (Grus canadensis) are recognized in the Midcontinental population, the lesser (Grus c. canadensis), Canadian (G. c. rowani), and greater (G. c. tabida). Blood samples collected on the population's primary spring staging area in Nebraska, U.S.A., were used to resolve the genetic relationship among these subspecies. Phylogenetic analysis of 27 G...
Authors
Jessica L. Petersen, Richard Bischof, Gary Krapu, Allen L. Szalanski
Does increasing daylength control seasonal changes in clutch sizes of Northern Pintails (Anas acuta)? Does increasing daylength control seasonal changes in clutch sizes of Northern Pintails (Anas acuta)?
We evaluated spatiotemporal variation in clutch sizes of Northern Pintails (pintails; Anas acuta) nesting in California (1985 to 1996), North Dakota (1982 to 1985), Saskatchewan (1982 to 1985) and Alaska (1991 to 1993) to determine whether seasonal declines in clutch size varied in ways that were consistent with a controlling influence of increasing day length. Pintails began nesting in...
Authors
Gary L. Krapu, G.A. Sargeant, A.E.H. Perkins
Factors associated with Autumn rearing of duck broods in temperate North America Factors associated with Autumn rearing of duck broods in temperate North America
Dabbling ducks Genus Anas occasionally nest during mid- and late summer in the Prairie Pothole Region (PPR) of midcontinent North America but little information is available on their Autumn-reared broods or those of other duck genera. Densities, species composition, and wetland habitat use by Autumn reared duck broods (age classes I and II) were determined on randomly distributed...
Authors
Gary L. Krapu, D.A. Brandt, J.A. Beiser
Recommendations for the attachment of satellite transmitters to cranes Recommendations for the attachment of satellite transmitters to cranes
Recent advances in miniaturization of satellite transmitters have resulted in thumb-sized packages weighing less than 30 g. These are smaller than VHF radios routinely mounted on crane leg bands. With this development and with favorable signal reception results, there is no need for, and much to recommend against the continued use of back-pack mounts. We provide details for leg-mount
Authors
D. H. Ellis, P.W. Howey, Gary L. Krapu