Publications
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Upper Midwest Environmental Sciences Center Publications
Filter Total Items: 3227
Volume loss and mass balance for selected physicochemical constituents in Lake Pepin, upper Mississippi River, USA
Lake Pepin is a large, natural riverine lake in the upper Mississippi River downstream of the Twin Cities metropolitan area and the confluence with the Minnesota River, which are sources of suspended sediments and pollutants (nutrients and potentially toxic materials). The lake has a history of water quality problems and has been an efficient trap for suspended sediment and sediment-associated con
Authors
William R. Maurer, Thomas O. Claflin, Ronald G. Rada, James T. Rogala
Transfer and accumulation of organochlorines from black-crowned night-heron eggs to chicks
Eggs and sibling 1-, 3-, and 5-d-old chicks from seven black-crowned night-heron (Nycticorax nycticorax) broods were collected from Green Bay, Wisconsin, and analyzed for organochlorines. The concentration (μg/g) of nine organochlorines either decreased (n = 7) or remained the same (n = 2) as the chicks grew older. In contrast, the total mass (μg) of these nine organochlorines increased (n = 7) or
Authors
T. W. Custer, Christine M. Custer
Phototaxis of larval and juvenile northern pike
Age- Phi northern pike Esox lucius prefer vegetated habitats that are difficult to sample with standard towed gears. Light traps can be effective for sampling larval fishes in dense vegetation, given positive phototaxis of fish. We evaluated the phototactic response of young northern pike by comparing the catches of larvae and juveniles obtained with plexiglass traps deployed with a chemical l
Authors
S. J. Zigler, M. R. Dewey
Declining populations of the fingernail clam Musculium transversum in the upper Mississippi River
We examined recent temporal trends in the abundance of fingernial clamsMusculium transversum (formerlySphaerium transversum) in the upper Mississippi River. Historical data on densities of fingernail clams were obtained from regional scientists and published literature. We also sampled benthos in six navigation pools in summer 1991, finding very few fingernail clams. The combined data set, includi
Authors
D. M. Wilson, T.J. Naimo, J.G. Weiner, R.V. Anderson, M.B. Sandheinrich, Richard E. Sparks
Evaluation of an extendable pole-net to collect heron eggs in the canopy of tall trees
A pole, extendable from 2 to 8 m, with a nylon-mesh collecting net, was used to retrieve eggs from nests of Great Blue Herons (Ardea herodias) in the canopy of floodplain forests. A total of 200 eggs was collected for contaminant analysis from ten colonies along the upper Mississippi River during the spring of 1993. Low egg breakage (1%) and acceptable survival of embryos in an incubator to pip
Authors
R. K. Hines, T. W. Custer
Effects of handling and aerial exposure on the survival of unionid mussels
We conducted a relocation study of unionid mussels in Navigation Pool 7 of the upper Mississippi River (river mile 713.2) to evaluate survival after handling and aerial exposure. Two separate studies were conducted to compare seasonal differences in mussel survival; the first was initiated in June and the second in October. Amblema plicata plicata (subfamily Ambleminae) and Obliquaria reflexa (sub
Authors
D. L. Waller, J.J. Rach, W.G. Cope, G.A. Miller
Past, present, and future concepts in large river ecology
No abstract available.
Authors
B. L. Johnson, W. B. Richardson, T.J. Naimo
Applying computer simulation models as learning tools in fishery management
Computer models can be powerful tools for addressing many problems in fishery management, but uncertainty about how to apply models and how they should perform can lead to a cautious approach to modeling. Within this approach, we expect models to make quantitative predictions but only after all model inputs have been estimated from empirical data and after the model has been tested for agreemen
Authors
B. L. Johnson
Double-crested cormorants along the upper Mississippi River
The Upper Mississippi River is an important habitat corridor for migratory birds and other wildlife, and it supports an important commercial and sport fishery. A study was initiated by the U.S. Fish and Wildlife Service in 1991 to describe Double-crested cormorant (Phalacrocorax auritus) distribution and abundance on the Upper Mississippi River throughout the year to better understand the possi
Authors
E.M. Kirsch
Optimization of a liquid chromatographic method for determination of malachite green and its metabolites in fish tissues
A liquid chromatographic (LC) method was adapted and optimized for the determination of malachite green and its metabolites in fish plasma and muscle. Residues in plasma were extracted with acetonitrile, the extract was evaporated to dryness, and residues were resolubilized for LC analysis. Residues in muscle were extracted with an acetonitrile- acetate buffer mixture, reextracted with acetonitril
Authors
S. M. Plakas, K.R. ELSaid, G. R. Stehly, J.E. Roybal
Efficacy and toxicity of formalin solutions containing paraformaldehyde for fish and egg treatments
Formalin used for fish and egg treatments at hatcheries often develops a white precipitate called paraformaldehyde when stored at low temperatures. This presents a problem for hatchery managers because most of the literature and treatment procedures claim that formalin containing paraformaldehyde is more toxic than pure formalin and is not safe for fish or egg treatments. Acute toxicity tests w
Authors
G.E. Howe, L. L. Marking, T.D. Bills, Theresa M. Schreier
Cadmium and mercury in sediment and burrowing mayfly nymphs (Hexagenia) in the upper Mississippi River, USA
Longitudinal patterns in the cadmium and mercury content of burrowing mayflies (Hexagenia) and surrounding sediments were examined along a 572-km reach of the upper Mississippi River. Surficial sediments and Hexagenia nymphs were sampled in 1989 at 12 sites extending from Pool 2 through Pool 16 and analyzed for total recoverable cadmium and total mercury. In sediment and nymphs, concentrations of
Authors
S.L. Beauvais, J.G. Wiener, G.J. Atchison