Publications
This list of publications includes peer-review journal articles, official USGS publications series, reports and more authored by scientists in the Ecosystems Mission Area. A database of all USGS publications, with advanced search features, can be accessed at the USGS Publications Warehouse.
Filter Total Items: 41772
Natural cavities used by wood ducks in north-central Minnesota
Radio telemetry was used to locate 31 wood duck (Aix sponsa) nest cavity sites in 16 forest stands. Stands were of 2 types: (1) mature (mean = 107 years) northern hardwoods (10 nest sites), and (2) mature (mean = 68 years) quaking aspen (Populus tremuloides) (21 nest sites). Aspen was the most important cavity-producing tree used by wood ducks and accounted for 57 percent of 28 cavities inspected.
Authors
D.S. Gilmer, I. J. Ball, L.M. Cowardin, J. Mathisen
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
Mate preference in wild and domesticated (game-farm) mallards (Anas platyrhynchos): I. Initial preference
Wild and game-farm mallards (Anas platyrhynchos) raised in pure strain and mixed groups were tested for initial mate preference in a choice test. Female mallards showed no significant preference but males of either strain raised with females of their own strain significantly preferred female models of their own strain during the test. Males raised with females of the other strain merely showed att
Authors
K.M. Cheng, R.N. Shoffner, R.E. Phillips, F.B. Lee
Waterfowl nesting on small man-made islands in prairie wetlands
Small islands constructed in prairie wetlands were attractive nesting sites for mallards (Anas platyrhynchos) and Canada geese (Branta canadensis). Nest densities of mallards on islands averaged 135 per ha compared to 0.03 per ha on adjacent upland habitats. Construction time averaged 2 hours per island and cost $50. No maintenance was required during the first 10 years.
Authors
R.F. Johnson, R.O. Woodward, L.M. Kirsch
Avian mortality caused by a September wind and hail storm
Abstract has not been submitted
Authors
K.F. Higgins, M. A. Johnson
Biochemical identification of mallard-black duck hybrids through a breeding program and in nature
From 1974 to 1976, a breeding program was used to produce black duck-mallard hybrids for the evaluation of inheritance patterns of serum proteins and esterases. In addition to the initial crosses, a series of matings in 1975 and 1976 were designed to evaluate inheritance patterns in hybrid matings with either black duck or mallards. At the F1 level, hybrids were easily distinguished. However, mall
Authors
R.P. Morgan, D. W. Meritt, S. B. Block, M. Cole
Interpreting the results of nesting studies
Nesting studies are used to assess the production of birds and to evaluate nesting habitats. Most such studies involve finding nests in a given area and subsequently determining the proportion that hatched. Unfortunately, the results are often biased by unrecognized differences in the probabilities of finding successful and unsuccessful nests. The observed hatch rates of 1,900 nests of blue-winged
Authors
H.W. Miller, D. H. Johnson
Red fox prey demands and implications to prairie duck production
Experiments were conducted during spring and summer with 33 red foxes (Vulpes vulpes) to determine prey demands, feeding characteristics, and growth rates using natural foods. Pups began eating prey the 4th week after birth. Then, prey consumption averaged 1.38 and 1.90 kg/pup/week for weeks 5-8 and 9-12 of the denning season respectively, and 2.54 kg/pup/week for the postdenning period. Feeding b
Authors
A. B. Sargeant
A remote controlled system for capturing nesting waterfowl
Abstract has not been submitted
Authors
C.W. Shaiffer, G.L. Krapu