Terry Shaffer (Former Employee)
Science and Products
Filter Total Items: 38
Duck nest success in the prairie potholes
Since the early 1970's, the numbers of some waterfowl species such as mallard (Anas platyrhynchos), blue-winged teal (A. discors), and northern pintail (A. acuta) have reached or nearly reached the lowest ever recorded. Low nest success (the proportion of nests in which one or more eggs hatch) in key breeding areas, including the U.S. Prairie Pothole region, is partly responsible for declines in d
Authors
Terry L. Shaffer, Wesley E. Newton
Factors associated with duck nest success in the prairie pothole region of Canada
Populations of some dabbling ducks have declined sharply in recent decades and information is needed to understand reasons for this. During 1982-85, we studied duck nesting for 1-4 years in 17 1.6 by 16.0-km, high-density duck areas in the Prairie Pothole Region (PPR) of Canada, 9 in parkland and 8 in prairie. We estimated nest-initiation dates, habitat preferences, nest success, and nest fates fo
Authors
Raymond J. Greenwood, Alan B. Sargeant, Douglas H. Johnson, Lewis M. Cowardin, Terry L. Shaffer
Science and Products
Filter Total Items: 38
Duck nest success in the prairie potholes
Since the early 1970's, the numbers of some waterfowl species such as mallard (Anas platyrhynchos), blue-winged teal (A. discors), and northern pintail (A. acuta) have reached or nearly reached the lowest ever recorded. Low nest success (the proportion of nests in which one or more eggs hatch) in key breeding areas, including the U.S. Prairie Pothole region, is partly responsible for declines in d
Authors
Terry L. Shaffer, Wesley E. Newton
Factors associated with duck nest success in the prairie pothole region of Canada
Populations of some dabbling ducks have declined sharply in recent decades and information is needed to understand reasons for this. During 1982-85, we studied duck nesting for 1-4 years in 17 1.6 by 16.0-km, high-density duck areas in the Prairie Pothole Region (PPR) of Canada, 9 in parkland and 8 in prairie. We estimated nest-initiation dates, habitat preferences, nest success, and nest fates fo
Authors
Raymond J. Greenwood, Alan B. Sargeant, Douglas H. Johnson, Lewis M. Cowardin, Terry L. Shaffer