Changes in Wisconsin's Lake Michigan salmonid sport fishery, 1969-1985
Michael J. Hansen, Paul T. Schultz, Becky A. Lasee
1990, North American Journal of Fisheries Management (10) 442-457
The modern sport fishery for salmonids in Wisconsin waters of Lake Michigan was begun during 1963-1969 with the stocking of rainbow trout (Oncorhynchus mykiss), lake trout (Salvelinus namaycush), brook trout (S. fontinalis), brown trout (Salmo trutta), coho salmon (O. kisutch), and chinook salmon (O. tshawytscha). The fishery grew rapidly...
Enzyme leaching of surficial geochemical samples for detecting hydromorphic trace-element anomalies associated with precious-metal mineralized bedrock buried beneath glacial overburden in northern Minnesota
Robert J. Clark, A. L. Meier, G. Riddle
Hausen Donald M.Halbe Douglas N.Petersen Erich U.Tafuri William J., editor(s)
1990, Conference Paper
One objective of the International Falls and Roseau, Minnesota, CUSMAP projects was to develop a means of conducting regional-scale geochemical surveys in areas where bedrock is buried beneath complex glacially derived overburden. Partial analysis of B-horizon soils offered hope for detecting subtle hydromorphic trace-element dispersion patterns. An enzyme-based partial leach...
Vertical distribution of adult American shad in the Connecticut River
David B. Witherell, Boyd Kynard
1990, Transactions of the American Fisheries Society (119) 151-155
Adult American shad Alosa sapidissima were sampled with vertical gill nets during the 1986 and 1987 spawning and postspawning migrations in the Connecticut River. Most (83%) were caught in the lower half of the water column, but not on the river bottom. The vertical distributions of gravid and spent fish were similar...
Gas transfer within a multi-stage packed column oxygen absorber: Model development and application
Barnaby J. Watten, Claude E. Boyd
1990, Aquacultural Engineering (9) 33-59
A packed column oxygen obsorber was developed in which oxygen flow is directed, in serial reuse, through parallel packed column stages receiving equal portions of the liquid being treated. The relative performance of the absorber was established using a computer simulation program employing finite difference-mass transfer calculations. The program was...
Modeling the effects of serial off-gas reuse on the performance of a hooded surface oxygen obsorption system
Barnaby J. Watten, J. W. Meade, Claude E. Boyd
1990, Aquacultural Engineering (9) 97-120
A numerical model was used to evaluate the performance of a surface agitation system designed to contact commercial oxygen with water. The modeled system was unique in that oxygen-rich off-gas, normally discharged to the atmosphere, was directed in serial reuse through additional contact stages receiving untreated water. A correlation between...
Enhanced bioaccumulation of mercury, cadmium and lead in low-alkalinity waters: An emerging regional environmental problem
J.G. Wiener, P.M. Stokes
1990, Environmental Toxicology and Chemistry (9) 821-823
During the past decade or so, observations of high mercury concentrations in fish have renewed concerns and mercury, primarily in two groups of fresh waters: low-alkalinity lakes (the topic of this editorial) and newly created impoundments. The recent focus on the chemistry and biota of low-alkalinity (< 50...
Effect of pH on the accumulation kinetics of pentachlorophenol in goldfish
G. R. Stehly, W. L. Hayton
1990, Archives of Environmental Contamination and Toxicology (19) 464-470
The kinetics of accumulation of pentachlorophenol (PCP) at various pH values were investigated to explore how pH-dependent accumulation might influence PCP toxicity. Goldfish (Carassius auratus) were exposed to 5 μg PCP/L in a static system buffered with 7.5 mM bicine orN,N-bis(2-hydroxyethyl)-2-aminoethane sulfonic acid (BES) at pH 7.0, 8.0, or 9.0....
Organic contamination of ground water at Gas Works Park, Seattle, Washington
G. L. Turney, D.F. Goerlitz
1990, Groundwater Monitoring & Remediation (10) 187-198
Gas Works Park, in Seattle, Washington, is located on the site of a coal and oil gasification plant that ceased operation in 1956. During operation, many types of wastes, including coal, tar, and oil, accumulated on-site. The park soil is currently (1986) contaminated with compounds such as polynuclear aromatic...
Coal in sub-Saharan-African countries undergoing desertification
J. N. Weaver, Michael E. Brownfield, M. J. Bergin
1990, Journal of African Earth Sciences (11) 261-271
Coal has been reported in 11 of the 16 sub-Saharan countries discussed in this appraisal: Mauritania, Senegal, Mali, Niger, Benin, Nigeria, Cameroon, Central African Republic, Sudan, Ethiopia, and Somalia. No coal occurrences have been reported in Gambia, Togo, Burkina, Chad, and Djibouti but coal may be present within these countries...
Well-purging criteria for sampling purgeable organic compounds
J. Gibs, T.E. Imbrigiotta
1990, Ground Water (28) 68-78
The results indicate that 1) purgeable organic compound concentrations stabilized when three casing volume were purged in only 55% of the cases evaluated in this study, 2) purgeable organic compounds concentrations did not consistently follow the temporal variation of, nor stabilize at the same time as, the measure field characteristics,...
Mass-balance model for predicting nitrate in ground water
Michael H. Frimpter, John J. Donohue, Michael V. Rapacz
1990, Journal of the New England Water Works Association (104) 219-232
A mass-balance accounting model can be used to guide the management of septic systems and fertilizers to control the degradation of ground-water quality in zones of an aquifer that contribute water to public-supply wells. The nitrate concentration of the mixture in the well can be predicted for steady-state conditions by...
Toxicokinetics of PAHs in Hexagenia
Guy R. Stehly, Peter F. Landrum, Mary G. Henry, C. Klemm
1990, Environmental Toxicology and Chemistry (9) 167-174
The accumulation kinetics of two waterborne polycyclic aromatic hydrocarbons (PAHs), benzo[a]pyrene (BAP) and phenanthrene (PHE), were studied in the mayfly nymph (Hexagenia limbata). The uptake clearance decreased while the bioconcentration of BAP increased with an increase in weight of the H. limbata nymph. The relationship between uptake clearance and bioconcentration for PHE was...
Particle velocity interpolation in block-centered finite difference groundwater flow models
Daniel J. Goode
1990, Water Resources Research (26) 925-940
A block-centered, finite difference model of two-dimensional groundwater flow yields velocity values at the midpoints of interfaces between adjacent blocks. Method of characteristics, random walk and particle-tracking models of solute transport require velocities at arbitrary particle locations within the finite difference grid. Particle path lines and travel times are sensitive...
Carbon dioxide retention and carbon exchange on unsaturated Quaternary sediments
Robert G. Striegl, D.E. Armstrong
1990, Geochimica et Cosmochimica Acta (54) 2277-2283
Retention of CO2 on three air-dried and partly water-saturated glacial and eolian sediments was measured at 20°C for a range in, PCO2 that commonly occurs in unsaturated zones. Ratios of the relative losses of CO2 and 14CO2 from a surrogate atmosphere overlying the sediments were 1:1 for the dry condition. For the wet condition, those relative...
Role of water in the smectite-to-illite reaction
Gene Whitney
1990, Clays and Clay Minerals (38) 343-350
A series of hydrothermal experiments was performed to determine the effect of fluid abundance on the reaction of smectite to illite. Experiments were conducted on K-saturated montmorillonite (<0.1-µm fraction) in a closed system at 250° to 400°C using run times of 1, 7, 14, 30, and 60 days at 100...
Mechanisms controlling Cu, Fe, Mn, and Co profiles in peat of the Filson Creek Fen, northeastern Minnesota
K. Walton-Day, L.H. Filipek, C. S.E. Papp
1990, Geochimica et Cosmochimica Acta (54) 2933-2946
Filson Creek Fen, located in northeastern Minnesota, overlies a Cu-Ni sulfide deposit. A site in the fen was studied to evaluate the hydrogeochemical mechanisms governing the development of Fe, Mn, Co, and Cu profiles in the peat. At the study site, surface peat approximately 1 m thick is separated from...
Hydrology of lakes and wetlands
Thomas C. Winter, Ming-Ko Woo
1990, Book chapter, Surface water hydrology
The existence of lakes and wetlands depends on the specific geologic setting that favors the ponding of water, and on the hydrologic processes that allow the body of water to persist at a given site. Lakes can occur only in topographic depressions, but wetlands occur in depressions, on flat areas,...
Fast algorithm for automatically computing Strahler stream order
Kenneth J. Lanfear
1990, Water Resources Bulletin (26) 977-981
An efficient algorithm was developed to determine Strahler stream order for segments of stream networks represented in a Geographic Information System (GIS). The algorithm correctly assigns Strahler stream order in topologically complex situations such as braided streams and multiple drainage outlets. Execution time varies nearly linearly with the number of...
Benthic invertebrate bioassays with toxic sediment and pore water
John P. Giesy, Cornell J. Rosiu, Robert L. Graney, Mary G. Henry
1990, Environmental Toxicology and Chemistry (9) 233-248
The relative sensitivities of bioassays to determine the toxicity of sediments were investigated and three methods of making the sample dilutions required to generate dose-response relationships were compared. The assays studied were: (a) Microtox®, a 15-min assay ofPhotobacterium phosphoreum bioluminescence inhibition by pore water; (b) 48-h Daphnia magnalethality test in pore water;...
Compilation of hydrologic data for the Edwards aquifer, San Antonio area, Texas, 1989, with 1934-89 summary
G.M. Nalley, M. W. Thomas
1990, Edwards Underground Water District Bulletin 49
No abstract available....
Decline of wildcelery buds in the lower Detroit River, 1950-85
Donald W. Schloesser, Bruce A. Manny
1990, Journal of Wildlife Management (54) 72-76
American wildcelery buds (Vallisneria americana), an abundant food eaten by diving ducks (Aythini) during migrations, decreased in the lower Detroit River of the Great Lakes from 1950 to 1985. Bud densities decreased at 2 (-14 and -18 buds/mA?) of 5 locations and were similar at 3 (-2, +2, and +3...
Origin of Florida Canyon and the role of spring sapping on the formation of submarine box canyons
Charles K. Paull, Fred N. Spiess, Joseph R. Curray, David C. Twichell
1990, Geological Society of America Bulletin (102) 502-515
Florida Canyon, one of a series of major submarine canyons on the southwestern edge of the Florida Platform, was surveyed using GLORIA, SeaBeam, and Deep-Tow technologies, and it was directly observed during three DSRV Alvin dives. Florida Canyon exhibits two distinct morphologies: a broad V-shaped upper canyon and a deeply entrenched, flat-floored,...
Evaluation of ground-water recharge along the Gila River as a result of the flood of October 1983, in and near the Gila River Indian Reservation, Maricopa and Pinal Counties, Arizona
A.D. Konieczki, S. R. Anderson
1990, Water-Resources Investigations Report 89-4148
Flow in the Gila River from the flood of October 1983 infiltrated the stream channel and recharged the groundwater system along the Gila River floodplain from Ashurst-Hayden Dam to the confluence with the Salt River. Changes in groundwater levels from January 1983 to March 1984 confirmed the occurrence of recharge...
Disease control: Rx for ailing waterfowl
K.E. Roertgen, R. M. Windingstad
1990, Minnesota Volunteer (53) 24-31
Ground-water levels, flow, and specific conductance in unconsolidated aquifers near Lake Erie, Cleveland to Conneaut, Ohio, September 1984
A. W. Coen III
1990, Water-Resources Investigations Report 89-4202
This report described ground-water levels, flow, and specific conductance in aquifer along the southern shore of Lake Erie from Cleveland to Conneaut, Ohio. The data were collected in September 1984 as part of the U.S Geological Survey's Northeast Glacial Buried Valley Regional Aquifer-System Analysis. The study area is about 60...
