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: 41778
Early imprinting in wild and game-farm mallards (Anas platyrhynchos): genotype and arousal
Early imprinting was studied under laboratory conditions in five lines of mallards (Anas platyrhynchos) with different degrees of wildness obtained through pedigreed breeding. Data were analyzed by the least squares method. Wild ducklings imprinted better than game-farm (domesticated) ducklings, and heterosis was demonstrated to exist in imprinting traits. Nonadditive genetic variations and genoty
Authors
K.M. Cheng, R.N. Shoffner, R.E. Phillips, L.J. Shapiro
Some ecological aspects of marbled godwits and willets in North Dakota
No abstract available.
Authors
K.F. Higgins, L.M. Kirsch, M.R. Ryan, Rochelle B. Renken
Use of prairie pothole habitat by breeding mallards
Abstract has not been submitted
Authors
T.J. Dwyer, G.L. Krapu, D.M. Janke
Second North Dakota record of Louisiana waterthrush
Abstract has not been submitted
Authors
C. A. Faanes
Forty-second breeding bird census - mixed prairie I-V and VIII
Abstract has not been submitted
Authors
D. H. Johnson
Estimating nest success: The Mayfield method and an alternative
Mayfield's method for calculating the success of a group of nests is examined in detail. The standard error of his estimator is developed. Mayfield's assumption that destroyed nests are at risk until the midpoint of the interval between visits leads to bias if nests are visited infrequently. A remedy is suggested, the Mayfield-40% method. I also present a competing model, which recognizes that the
Authors
Douglas H. Johnson
Marsh nesting by mallards
Nest-site selection by mallard (Anas platyrhynchos) hens was studied on a 52-km2, privately owned area in the Missouri Coteau of south-central North Dakota during 1974-77. Sixty-six percent of 53 nests initiated by radio-marked and unmarked hens were in wetlands in dense stands of emergent vegetation and usually within 50 m of the wetland edge. These findings and other sources of information sugge
Authors
G.L. Krapu, L.G. Talent, T.J. Dwyer
PCBs and DDE in commercial fish feeds
Three commercial fish feeds were analyzed for PCBs and p,p' DDE and were reported in dry weight concentrations. In various sizes of Oregon Moist Pellets, concentrations of PCBs ranged from less than 0.10 to 0.30 I?g/g and those of p,p' DDE from less than 0.01 to 0.47 I?g/g. In Silver Cup, concentrations of PCBs were 0.06 to 0.07 I?g/g, and p,p' DDE, 0.01 to 0.06 I?g/g. Nauplii of brine shrimp (Art
Authors
Michael J. Mac, L.W. Nicholson, C.A. McCauley