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: 41771
Cardinal and mockingbird in Jamestown, North Dakota
Abstract has not been submitted
Authors
D. H. Johnson, J.E. Johnson
Duck nesting in fields of undisturbed grass-legume cover
A study of dabbling duck (Anatinae) nesting was conducted during 1971-73 on nine 12- to 54-ha Cropland Adjustment Program fields in the prairie pothole region of north-central South Dakota. The tall, dense vegetation was comprised of introduced cool-season grasses and legumes, primarily smooth bromegrass (Bromus inermis), intermediate wheatgrass (Agropyron intermedium), and alfalfa. Complexes of t
Authors
H. F. Duebbert, J. T. Lokemoen
Restoration of the giant Canada goose in North Dakota
Abstract has not been submitted
Authors
F.B. Lee, L.J. Schoonover, J.A. Cooper, M. Johnson
Feeding ecology of breeding gadwalls on saline wetlands
The feeding ecology of breeding gadwalls (Anas strepera) from saline wetlands in North Dakota was examined in relation to sex, pair mates, reproductive status, food availability, and wetland type during the spring and summer of 1971 and 1972. Esophagi of males and females contained 40.4 and 48.2 percent animal food, respectively, between 17 April and 25 August. Animal foods consumed by paired fema
Authors
J.R. Serie, G.A. Swanson
Spring mortality of insectivorous birds in southern Manitoba
Abstract has not been submitted
Authors
J.R. Serie, R. E. Jones
Ferruginous hawk nesting ecology and raptor populations in northern South Dakota
No abstract available.
Authors
J. T. Lokemoen, H. F. Duebbert
A hematologic survey of captive waterfowl
Hematologic parameters were studied in giant Canada geese (Branta canadensis maxima), mallard ducks (Anas platyrhynchos platyrhynchos) and various species of diving ducks at seasonal intervals throughout the year. Highest values for packed cell volume, hemoglobin content and erythrocyte counts were found in the winter and pre-nesting periods. Mean corpuscular volume and mean corpuscular hemoglobin
Authors
H.J. Shave, V. Howard
Acute toxic effects of two lampricides on twenty-one freshwater invertebrates
We conducted laboratory static bioassays to determine acute toxicity of two lampricides -- a 70% 2-aminoethanol salt of 5,2'dichloro-4'-nitrosalicylanilide (Bayer 73) and a mixture containing 98% 3-trifluoromethyl-4-nitrophenol (TFM) and 2% Bayer 73 (TFM-2B) -- to 21 freshwater invertebrates. LC50 values were determined for 24-h exposure periods at 12.8 C. Organisms relatively sensitive to Bayer 7
Authors
Robert P. Rye, Everett Louis King
Allantoinase in the marine polychaete Eudistylia vancouveri
Allantoinase, an enzyme in the purine-urea cycle, was found in Eudistylia vancouveri (Polychaeta). The enzyme had a pH optimum at 7.6. The Km was 0.012 M allantoin, and the Arrhenius energy of activation was 12.6 to 14.6 kcal/mol.
Authors
Dora R. M. Passino, G.W. Brown
Retention of mercury in the muscle of yellow perch (Perca flavescens) and rock bass (Ambloplites rupestris)
Mercury-contaminated yellow perch (Perca flavescens) and rock bass (Ambloplites rupestris) were collected from Lake St. Clair and stocked in two earthen ponds in September 1970. Twenty-six months later, concentrations of total mercury in the fillets had declined 53% in the yellow perch and 59% in the rock bass; however, the mean weight of the fish increased 88 and 183%, respectively, during the sa
Authors
Percy W. Laarman, Wayne A. Willford, James R. Olson