Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 10384
Source-sink dynamics and the coexistence of species on a single resource Source-sink dynamics and the coexistence of species on a single resource
We investigate the potential for coexistence of species that compete for a shared resource when the resource occurs in both a source area acting as a refuge and a sink area where it is used by the competing species. Our model shows that the mixing rate between the source and sink resource populations has a dramatic influence on the outcome of competition. When there is a strict sink...
Authors
M. Loreau, D.L. DeAngelis
Use of inexpensive pressure transducers for measuring water levels in wells Use of inexpensive pressure transducers for measuring water levels in wells
Frequent measurement of below ground water levels at multiple locations is an important component of many wetland ecosystem studies. These measurements, however, are usually time consuming, labor intensive, and expensive. This paper describes a water-level sensor that is inexpensive and easy to construct. The sensor is placed below the expected low water level in a shallow well and, when...
Authors
B. D. Keeland, J.F. Dowd, W.S. Hardegree
Simulation of ground-water flow in the Coastal Plain aquifer system of North Carolina Simulation of ground-water flow in the Coastal Plain aquifer system of North Carolina
A three-dimensional finite-difference digital model was used to simulate ground-water flow in the 25,000-square-mile aquifer system of the North Carolina Coastal Plain. The model was developed from a hydrogeologic framework that is based on an alternating sequence of 10 aquifers and 9 confining units, which make up a seaward-thickening wedge of sediments that form the Coastal Plain...
Authors
G.I. Giese, J. L. Eimers, R. W. Coble
World Wide Web access to publications and data for the Apalachicola-Chattahoochee-Flint River Basin, Georgia, Florida, and Alabama, 1992-95 World Wide Web access to publications and data for the Apalachicola-Chattahoochee-Flint River Basin, Georgia, Florida, and Alabama, 1992-95
No abstract available.
Authors
Jerry W. Garrett, Howard A. Perlman, Judith Scholz
Surface salinity of Florida Bay Surface salinity of Florida Bay
No abstract available.
Authors
R. B. Halley, Dewitt Smith, M. E. Hansen
Analysis of tests of subsurface injection, storage, and recovery of freshwater in the lower Floridan aquifer, Okeechobee County, Florida Analysis of tests of subsurface injection, storage, and recovery of freshwater in the lower Floridan aquifer, Okeechobee County, Florida
A series of freshwater subsurface injection, storage, and recovery tests were conducted at an injection-well site near Lake Okeechobee in Okeechobee County, Florida, to assess the recoverability of injected canal water from the Lower Floridan aquifer. At the study site, the Lower Floridan aquifer is characterized as having four local, relatively independent, high-permeability flow zones...
Authors
Vicente Quinones-Aponte, Kevin Kotun, J. F. Whitley
Remote sensing at the Southern Science Center Remote sensing at the Southern Science Center
No abstract available
Authors
D.K. Chappell, S.C. Laine
1995 Scanned aerial photography of the Kisatchie National Forest in Louisiana 1995 Scanned aerial photography of the Kisatchie National Forest in Louisiana
No abstract available.
Authors
Calvin P. O’Neil, Lawrence R. Handley, Stephen Hartley, James B. Johnston, B. Coffland, Lynn Schoelerman
Prevalence of double wing molt in free-living ruddy ducks Prevalence of double wing molt in free-living ruddy ducks
No abstract available
Authors
William L. Hohman
Impacts of elevated inorganic carbon concentrations of the autotrophic components of coastal submersed macrophyte communities Impacts of elevated inorganic carbon concentrations of the autotrophic components of coastal submersed macrophyte communities
No abstract available.
Authors
William M. Rizzo, Hilary A. Neckles, Ronald G. Boustany, David R. Meaux, Martha R. Griffis
A spatial decision support system for coastal management: A research project at the National Wetlands Research Center of the U.S. Geological Survey A spatial decision support system for coastal management: A research project at the National Wetlands Research Center of the U.S. Geological Survey
Environmental resource managers and scientists are being challenged in developing strategies to manage complex coastal systems. From an ecological perspective, there are myriad dynamic, interrelated natural and human-induced processes that affect the health and stability of coastal systems. However, the problems associated with managing coastal resources usually transcend purely...
Authors
Wei Ji, James B. Johnston