Publications
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Upper Midwest Environmental Sciences Center Publications
Filter Total Items: 3226
Finite-difference grid for a doublet well in an anisotropic aquifer
The U.S. Geological Survey is modeling hydraulic flow and thermal-energy transport at a two-well injection/ withdrawal system in St. Paul, Minnesota. The design of the finite-difference model grid for the doublet-well system is complicated because the aquifer is anisotropic and the principal axes of transmissivity are not aligned with the axis between the two wells.
An analytical solution for flow
Authors
R. T. Miller, C.I. Voss
Status of fishery chemicals in 1985
Abstract has not been submitted
Authors
R.A. Schnick, F. P. Meyer, D.F. Walsh
Distribution of early life history stages of fishes in selected pools of the upper Mississippi River
Effective management of the fishery resources of the Upper Mississippi River and successful mitigation of the loss of critical habitat depend in part on an understanding of the reproductive and early life history requirements of the affected fishes. However, little is known about the use of nursery areas by fishes in the river. Of the nearly 130 species identified in the adult ichthyofauna, only a
Authors
L.E. Holland
Loss of lampricides by adsorption on bottom sediments
Problems have been encountered in maintaining effective concentrations of the lampricides 3-trifluoromethyl-4-nitrophenol (TFM) and 5,2a??-dichloro-4a??-nitrosalicylanilide (Bayer 73) during treatments of certain Great Lakes tributaries. Concentrations of Bayer 73 decreased by more than 80% in a portion of the Ford River, Michigan, during treatment in 1980. Adsorption of Bayer 73 on sediments was
Authors
V. K. Dawson, D.A. Johnson, J. L. Allen
Computer program calculation of gas supersaturation in water
Abstract has not been submitted
Authors
V. K. Dawson
Invertebrate communities associated with Bangia atropurpurea and Cladophora glomerata in western Lake Erie
The appearance of the marine alga Bangia atropurpurea (Rhodophyta) in Lake Erie has been followed by its rapid dispersal throughout the eulittoral zone of the lake. Bangia was extensively sampled to determine its suitability as a habitat for littoral organisms. Present data indicate that the only organisms capable of maintaining populations on Bangia filaments are larval Chironomidae. Cladophora s
Authors
E.W. Chilton, R.L. Lowe, K.M. Schurr
Potential for nitrosamine formation in seven fishery chemicals
Demand feeders were installed on 5-acre
rearing ponds for fingerling steelhead (Salmo gairdneri)
to replace truck-mounted feed blowers. Because the demand
feeders could dispense dry feed, substantial savings
in feed costs were realized. The demand feeders
supported acceptable fish survival and feed conversion
rates, and they removed the uncertainty of feed calculations
associatedw ith large
Authors
S. L. Abidi, V. K. Dawson, R.C. Hubley
Environmental fate of mercury discharged into the upper Wisconsin River
The authors studied the distribution of Hg in sediments, fish, and crayfish in a 60 km reach of the Upper Wisconsin River that formerly received Hg in discharges from pulp and paper mills. The most heavily contaminated strata of sediments were deposited during the 1950s and early 1960s and buried under subsequent deposits; however, surficial sediments remained substantially enriched at certain
Authors
R.G. Rada, J.E. Findley, J.G. Wiener
Does pH affect fish species richness when lake area is considered?
Numerous surveys have shown that fish species richness (number of species) is positively correlated with lake pH. However, species richness of fish communities is also correlated with lake size, and low-pH lakes are often small. Thus, conclusions drawn from examination of fish community structure relative to spatial (among- lake) variation in pH have been limited by uncertainties regarding the c
Authors
P.J. Rago, J.G. Wiener
An integrated system for treating nitrogen supersaturated water
Groundwater is commonly supersaturated with nitrogen and must be treated it is used for culturing fish-- especially sensitive species such as lake trout (Salvelinus namaycush ) and Atlantic salmon (Salmo salar ). The authors treated water with an integrated system that passed water through a packed column aerator, then through a vacuum degasser, and finally through another packed column aerator
Authors
V. K. Dawson, L. L. Marking
Effects of barge traffic on distribution and survival of ichthyoplankton and small fishes in the upper Mississippi River
Short-term impacts of commercial barge traffic on fish eggs, larvae, young-of-the-year (age-0) fishes, and small adults in the main channel of the upper Mississippi River were examined. Barge passages caused significant changes in the distribution of eggs and larvae in the study area. The mean catch of ichthyoplankton was reduced in both surface and bottom waters for 90 min after passage of ves
Authors
L.E. Holland