Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 10420
Food preferences of spring-migrating blue-winged teal in southwestern Louisiana Food preferences of spring-migrating blue-winged teal in southwestern Louisiana
We studied effects of pair status, molt intensity, and year on food selection by migrating male blue-winged teal (Anas discors) in southwestern Louisiana during springs 1990 and 1991. Diets consisted primarily of animal foods; but plant material, consisting mostly of seeds, comprised as much as 44%. There was no difference in animal food consumption by paired and unpaired males; however...
Authors
Scott W. Manley, W.L. Hohman, J.L. Moore, David Richard
Baseline levels of certain trace metals in sediment and biota Baseline levels of certain trace metals in sediment and biota
No abstract available.
Authors
A. J. Krynitsky, C.P. Rice, P.F. Roscigno
Water resources data Texas, water year 1991, volume 4. Ground water Water resources data Texas, water year 1991, volume 4. Ground water
No abstract available.
Authors
S. C. Gandara, H.D. Buckner
Hydrogeologic maps of the central Oklahoma aquifer, Oklahoma Hydrogeologic maps of the central Oklahoma aquifer, Oklahoma
This report presents hydrogeologic maps of the Central Oklahoma aquifer. The maps were prepared by measuring water levels in wells during the winder of 1986 and 1987; examination of geophysical logs to determine the altitudes of the top of selected geologic units and the base of fresh ground water; and compilation of existing information on the stratigraphy of selected geologic units and...
Authors
Scott C. Christenson, Robert B. Morton, Benard A. Mesander
Techniques for estimating 7-day, 10-year low-flow characteristics for ungaged sites on streams in Mississippi Techniques for estimating 7-day, 10-year low-flow characteristics for ungaged sites on streams in Mississippi
Mississippi State water laws require that the 7-day, 10-year low-flow characteristic (7Q10) of streams be used as a criterion for issuing wastedischarge permits to dischargers to streams and for limiting withdrawals of water from streams. This report presents techniques for estimating the 7Q10 for ungaged sites on streams in Mississippi based on the availability of baseflow discharge...
Authors
Pamela A. Telis
Effects of dried wastewater-treatment sludge application on ground-water quality in South Dade County, Florida Effects of dried wastewater-treatment sludge application on ground-water quality in South Dade County, Florida
Four test fields in the south Dade agricultural area were studied to determine the effects of sludge application on ground-water quality. Two fields had been cultivated for 10 years or more, and two had not been farmed for at least 10 years. The fields were representative of the area's two soil types (Rockdale and Perrine marl) and two major crop types (row crops and groves). Before the
Authors
Barbara Howie
Aquatic hazard assessment of the organophosphate insecticide fonofos Aquatic hazard assessment of the organophosphate insecticide fonofos
This study determined the acute and chronic toxicity of the organophosphate insecticide fonofos to standard freshwater aquatic organisms under laboratory conditions. Fonofos was acutely toxic to bluegill (Lepomis macrochirus), Daphnia (D. magna), and midge (Chironomous riparius) at 5.3, 2.7, and 39 μg/L, respectively. Three fonofos formulations (technical, 94.8% A.I.; 20G, field granular...
Authors
James F. Fairchild, Edward E. Little, James N. Huckins
A reconnaissance study of herbicides and their metabolites in surface water of the midwestern united states using immunoassay and gas chromatography/mass spectrometry A reconnaissance study of herbicides and their metabolites in surface water of the midwestern united states using immunoassay and gas chromatography/mass spectrometry
Preemergent herbicides and their metabolites, particularly atrazine, deethylatrazine, and metolachlor, persisted from 1989 to 1990 in the majority of rivers and streams in the midwestern United States. In spring, after the application of herbicides, the concentrations of atrazine, alachlor, and simazine were frequently 3-10 times greater than the U.S. Environmental Protection Agency...
Authors
E. Michael Thurman, D. A. Goolsby, M. T. Meyer, M. S. Mills, M.L. Pomes, Dana W. Kolpin
Leporacanthicus triactis, a new loricariid fish from upper Orinoco River tributaries in Venezuela and Colombia (Pisces, Siluriformes, Loricariidae) Leporacanthicus triactis, a new loricariid fish from upper Orinoco River tributaries in Venezuela and Colombia (Pisces, Siluriformes, Loricariidae)
Abstract not supplied at this time
Authors
I.J. Isbrucker, H. Nijssen, L.G. Nico
Rivulus tecminae, a new killifish from Amazonas Territory, Venezuela (Rivulidae, Cyprinodontiformes) Rivulus tecminae, a new killifish from Amazonas Territory, Venezuela (Rivulidae, Cyprinodontiformes)
Abstract not supplied at this time
Authors
J.E. Thomerson, L.G. Nico, D.C. Taphorn
Investigations into the effects of PCB congeners on reproduction in lake trout from the Great Lakes Investigations into the effects of PCB congeners on reproduction in lake trout from the Great Lakes
Eggs of feral lake trout collected in Lake Michigan were reared under laboratory conditions and monitored for egg hatchability, physical abnormalities, and survival of fry. Subsamples of eggs were also analyzed for PCB congeners. A negative correlation was found between egg hatchability and total PCBs but expressing PCB dose as dioxin equivalents did not produce as strong a correlation...
Authors
Michael J. Mac, T.R. Schwartz
Knowledge-based GIS: An expert system approach for managing wetlands Knowledge-based GIS: An expert system approach for managing wetlands
No abstract available
Authors
Wei Ji, James B. Johnston, Marcia McNiff, Loyd C. Mitchell