Publications
Read publications and other informational products to learn more about USGS science occurring in the Mississippi Basin.
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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
Toxicity of agricultural subsurface drainwater from the San Joaquin Valley, California to juvenile chinook salmon and striped bass Toxicity of agricultural subsurface drainwater from the San Joaquin Valley, California to juvenile chinook salmon and striped bass
Juvenile chinook salmon Oncorhynchus tshawytscha (40-50 mm total length, TL) and striped bass Morone saxatilis (30-40 mm TL) were exposed to serial dilutions (100, 50, 25, and 12.5%) of agricultural subsurface drainwater (WWD), reconstituted drainwater (RWWD), and reconstituted seawater (IO). Agricultural subsurface drainwater contained naturally elevated concentrations of major ions...
Authors
Michael K. Saiki, Mark R. Jennings, Raymond H. Wiedmeyer
Hydrologic data for the Big Spring basin, Clayton County, Iowa, water year 1990 Hydrologic data for the Big Spring basin, Clayton County, Iowa, water year 1990
Hydrologic data were collected in the Big Spring basin located in Clayton County, Iowa, during the 1990 water year. The data were collected by the U.S. Geological Survey in cooperation with the Iowa Department of Natural Resources, Geological Survey Bureau, to provide information on variation and movement of agricultural chemicals in the hydrologic cycle in the basin. Precipitation...
Authors
Stephen J. Kalkhoff, R.L. Kuzniar, D. Kolpin, C.A. Harvey
Time of travel and dispersion in a selected reach of Roberts Creek, Clayton County, Iowa Time of travel and dispersion in a selected reach of Roberts Creek, Clayton County, Iowa
Time of travel and dispersion were determined in a 9.4-river-mile reach of Roberts Creek in northwestern Clayton County, Iowa, in the spring of 1990. Time of travel was determined so that a discrete parcel of water could be sampled through the study area during medium to low streamflow conditions. Dispersion characteristics were determined to identify solute-transport differences under...
Authors
D.W. Kolpin, S. J. Kalkhoff
Evaluation of selected methods for determining streamflow during periods of ice effect Evaluation of selected methods for determining streamflow during periods of ice effect
Seventeen methods for estimating ice-affected streamflow are evaluated for potential use with the U.S. Geological Survey streamflow-gaging station network. The methods evaluated were identified by written responses from U.S. Geological Survey field offices and by a comprehensive literature search. The methods selected and techniques used for applying the methods are described in this...
Authors
Norwood B. Melcher, J.F. Walker
Quality-assurance plan for the analysis of fluvial sediment by laboratories of the U.S. Geological Survey Quality-assurance plan for the analysis of fluvial sediment by laboratories of the U.S. Geological Survey
This report describes procedures used by the Iowa District sediment laboratory of the U.S. Geological Survey to assure the quality of sediment-laboratory data. These procedures can be used by other U.S. Geological Survey laboratories regardless of size and type of operation for quality assurance and quality control of specific sediment-laboratory processes. Also described are the...
Authors
Wilbur J. Matthes, Clyde J. Sholar, John R. George
An indexed bibliography of the herpetofauna of Florida An indexed bibliography of the herpetofauna of Florida
No abstract available.
Authors
Kevin M. Enge, C. Kenneth Dodd