Publications
Read publications and other informational products to learn more about USGS science occurring in the Mississippi Basin.
Filter Total Items: 5568
A summary of water-resources activities of the U.S. Geological Survey in Iowa; fiscal year 1990 A summary of water-resources activities of the U.S. Geological Survey in Iowa; fiscal year 1990
Water resources activities of the U.S. Geological Survey in Iowa consist of collecting hydrologic data and conducting interpretive studies. Hydrologic investigations in Iowa are made through three basic types of projects: (1) hydrologic data-collection programs; (2) local or areal hydrologic studies; and (3) statewide or regional investigations. These projects are funded through...
An evaluation of bone growth- layer counts as an age-determination technique in Florida manatees An evaluation of bone growth- layer counts as an age-determination technique in Florida manatees
Abstract not supplied at this time
Authors
M. Marmontel, T. J. O'Shea, S.R. Humphrey
Manatee grazing impacts on seagrasses in Hobe Sound and Jupiter Sound in southeast Florida during the winter of 1988-1989 Manatee grazing impacts on seagrasses in Hobe Sound and Jupiter Sound in southeast Florida during the winter of 1988-1989
Abstract not supplied at this time
Authors
L.W. Lefebvre, J. A. Powell
Don't release exotic fish Don't release exotic fish
Abstract not supplied at this time
Authors
Dawn P. Jennings, J.D. Williams
Determination and occurrence of AHH-active polychlorinated biphenyls, 2,3,7,8-tetrachloro-p-dioxin and 2,3,7,8-tetrachlorodibenzofuran in Lake Michigan sediment and biota. The question of their relative toxicological significance Determination and occurrence of AHH-active polychlorinated biphenyls, 2,3,7,8-tetrachloro-p-dioxin and 2,3,7,8-tetrachlorodibenzofuran in Lake Michigan sediment and biota. The question of their relative toxicological significance
An analytical procedure has been developed for the determination of the 18 PCB congeners which are inducers of methylcholanthrene-like mixed function oxidase activity in animals and include the most toxic PCBs. Determinations of the toxic PCB congeners in samples of eggs of predatory fish and piscivorous birds of the Great Lakes and in Aroclor mixtures demonstrate that the apparent toxic...
Authors
Lawrence M. Smith, Ted R. Schwartz, Kevin Feltz, Timothy J. Kubiak
Encephalization quotients and life-history traits in the Sirenia Encephalization quotients and life-history traits in the Sirenia
Relative brain size in the Sirenia is unusually small. Encephalization quotients are 0.27 for Florida manatees (Trichechus manatus) and 0.38 for dugongs (Dugong dugon). Estimates for Steller's sea cow (Hydrodamalis gigas) range from 0.12 to 0.19. These values are among the lowest known for Recent mammals, and seemingly have changed little since the Eocene. A body plan specialized for the...
Authors
T. J. O'Shea, R.L. Reep
Reconnaissance surficial geologic map of the mountainous parts of Loudoun County, Virginia Reconnaissance surficial geologic map of the mountainous parts of Loudoun County, Virginia
No abstract available.
Authors
Robert B. Jacobson, R. C. McDowell, D.J. Milton, Wayne L. Newell, J. S. Pomeroy, J.S. Schindler, C.S. Southworth
National contaminant biomonitoring program: Residues of organochlorine chemicals in U.S. Freshwater Fish, 1976–1984 National contaminant biomonitoring program: Residues of organochlorine chemicals in U.S. Freshwater Fish, 1976–1984
The U.S. Fish and Wildlife Service periodically determines concentrations of organochlorine chemicals in freshwater fish collected from a nationwide network of stations as part of the National Contaminant Biomonitoring Program (NCBP, formerly a part of the National Pesticide Monitoring Program). From late 1984 to early 1985, a total of 321 composite fish samples were collected from 112...
Authors
Christopher J. Schmitt, Jim L. Zajicek, Paul H. Peterman
Wetland vegetation Wetland vegetation
No abstract available.
Authors
Glenn R. Guntenspergen, F. Stearns, J.A. Kadlec
Modeling coastal Louisiana's vulnerability to oil and toxic chemical spills Modeling coastal Louisiana's vulnerability to oil and toxic chemical spills
No abstract available.
Authors
Floyd O. Stayner, James B. Johnston, James D. Scurry
Streamside habitats in southern forested wetlands: Their role and implications for management Streamside habitats in southern forested wetlands: Their role and implications for management
The value of streamside forests to fish and wildlife and the influence of forest management on their value have been recognized in a general sense for decades. However, in today’s climate of increasing environmental regulation and intensive forest management, there is need for more detailed understanding of the value of streamside forests to fish and wildlife. Dickson and Huntley (1987...
Authors
Rebecca J. Howard, James A. Allen