Publications
Read publications and other informational products to learn more about USGS science occurring in the Mississippi Basin.
Filter Total Items: 5584
Distribution of annual fishes (Pisces-Rivulidae) in the Rio Unare basin, Venezuela Distribution of annual fishes (Pisces-Rivulidae) in the Rio Unare basin, Venezuela
Abstract not supplied at this time
Authors
J.E. Thomerson, D.C. Taphorn, L.G. Nico
Comments on the proposed conservation of Proptera Rafinesque, 1819 (Mollusca Bivalvia) Comments on the proposed conservation of Proptera Rafinesque, 1819 (Mollusca Bivalvia)
No abstract available.
Authors
A.E. Bogan, J.D. Williams, S. L. H. Fuller
Regional evaluation of hydrologic factors and effects of pumping, St Peter-Jordan aquifer, Iowa Regional evaluation of hydrologic factors and effects of pumping, St Peter-Jordan aquifer, Iowa
The St. Peter-Jordan aquifer includes the Cambrian Jordan Sandstone and the overlying Ordovician Prairie du Chien Group and St. Peter Sandstone. The aquifer is present throughout Iowa and is confined beneath other aquifers in much of the State. Information on the aquifer available from drillers and contractors, provided estimates of aquifer transmissivity values ranging from about 500 to...
Authors
M. R. Burkart, Robert Buchmiller
Regional brain morphometry and lissencephaly in the Sirenia Regional brain morphometry and lissencephaly in the Sirenia
Neuroanatomical structure was examined in the brains of West Indian manatees (Trichechus manatus) using computer-based morphometric methods. Although manatees have a small relative brain size, volume estimates of the major brain regions indicate that the telencephalon comprises 71% of totalbrain volume and is 90% cerebral cortex. These values are comparable to those seen among a...
Authors
Roger L. Reep, Thomas J. O’Shea
Statistical summaries of selected Iowa streamflow data through September 30, 1988 Statistical summaries of selected Iowa streamflow data through September 30, 1988
Statistical summaries of streamflow data collected at 144 active and discontinued stream-gaging stations in Iowa through water year 1988 are presented in the report. The summaries for each streamgaging station include: 1) station description, 2) the most recent stage-discharge rating table, 3) statistics of monthly and annual mean discharges, 4) boxplots of monthly and annual mean...
Authors
E.E. Fischer, N.B. Melcher, S.P. Kluesner
Feeding chronology of juvenile piranhas, Pygocentrus notatus, in the Venezuelan llanos Feeding chronology of juvenile piranhas, Pygocentrus notatus, in the Venezuelan llanos
During the 1988 rainy season, I studied the 24 h feeding chronology of juvenile (40–68 mm standard length) piranhas, Pygocentrus notatus (Characidae: Serrasalminae) from a natural population inhabiting a small savanna stream in Apure State, Venezuela. Stomach contents analyses, supported by laboratory determinations of digestion rate, showed that these fish are primarily diurnal...
Authors
L.G. Nico
Distribucion y abundancia del manati, Trichechus manatus, en Venezuela Distribucion y abundancia del manati, Trichechus manatus, en Venezuela
Abstract not supplied at this time
Authors
M. Correa-Viana, T. J. O'Shea, M.E. Ludlow, J.G. Robinson
Florida manatees: distribution, geographically referenced data sets, and ecological and behavioral aspects of habitat use Florida manatees: distribution, geographically referenced data sets, and ecological and behavioral aspects of habitat use
Abstract not supplied at this time
Authors
T. J. O'Shea, H. I. Kochman
Toxicity of organic selenium in the diet to chinook salmon Toxicity of organic selenium in the diet to chinook salmon
The toxicity of two organoselenium diets was evaluated in 90- to 120-d partial life cycle tests with two life stages of chinook salmon (Oncorhynchus tshawytscha Walbaum). One of the diets contained fish meal made from high-selenium mosquitofish (Gambusia affinis Baird and Girard) collected from the selenium-laden San Luis Drain, California (here termed SLD diet) and the other contained...
Authors
Steven J. Hamilton, Kevin J. Buhl, Neil L. Faerber, Fern A. Bullard, Raymond H. Wiedmeyer
Analysis of alternative modifications for reducing backwater flooding at the Honey Creek coal strip mine reclamation site in Henry County, Missouri Analysis of alternative modifications for reducing backwater flooding at the Honey Creek coal strip mine reclamation site in Henry County, Missouri
No abstract available.
Authors
T.W. Alexander
Postures associated with immobile woodland salamanders, genus Plethodon Postures associated with immobile woodland salamanders, genus Plethodon
Abstract not supplied at this time
Authors
C.K. Dodd