Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 10382
Response to comments on "Productivity is a poor predictor of plant species richness" Response to comments on "Productivity is a poor predictor of plant species richness"
Pan et al. claim that our results actually support a strong linear positive relationship between productivity and richness, whereas Fridley et al. contend that the data support a strong humped relationship. These responses illustrate how preoccupation with bivariate patterns distracts from a deeper understanding of the multivariate mechanisms that control these important ecosystem...
Authors
James B. Grace, Peter B. Adler, Eric W. Seabloom, Elizabeth T. Borer, Helmut Hillebrand, Yann Hautier, Andy Hector, W. Stanley Harpole, Lydia R. O’Halloran, T. Michael Anderson, Jonathan D. Bakker, Cynthia S. Brown, Yvonne M. Buckley, Scott L. Collins, Kathryn L. Cottingham, Michael J. Crawley, Ellen Ingman Damschen, Kendi F. Davies, Nicole M. DeCrappeo, Philip A. Fay, Jennifer Firn, Daniel S. Gruner, Nicole Hagenah, Virginia L. Jin, Kevin P. Kirkman, Johannes M.H. Knops, Kimberly J. La Pierre, John G. Lambrinos, Brett A. Melbourne, Charles E. Mitchell, Joslin L. Moore, John W. Morgan, John L. Orrock, Suzanne M. Prover, Carly J. Stevens, Peter D. Wragg, Louie H. Yang
Estimating shorebird populations during spring stopover in rice fields of the Louisiana and Texas Gulf Coastal Plain Estimating shorebird populations during spring stopover in rice fields of the Louisiana and Texas Gulf Coastal Plain
Migrating shorebird populations using approximately 2% of Louisiana and Texas Gulf Coastal rice fields were surveyed during spring migration (March–May of 1997 and 1998) using biweekly stratified random surveys conducted at 50 roadside survey points and approximately 30,000 shorebirds were observed. Shorebird counts were extrapolated and almost 1.4 million birds in 1997 and over 1.6...
Authors
Wayne Norling, Clinton W. Jeske, Tyler F. Thigpen, Paul C. Chadwick
Myocastor coypus Molina (coypu) Myocastor coypus Molina (coypu)
Myocastor coypus (coypu) (Figure 30.1) is a large semi-aquatic rodent native to South America that is now present in all continents, except Oceania and Antarctica, after widespread introductions in the 1930-1940s. There is a division in English speaking countries as to common name usage. In England and former British colonies (i.e. Kenya) they are called "coypus". In North America and...
Authors
Sandro Bertolino, Laura M Guichon, Jacoby Carter
Simulation of streamflow and the effects of brush management on water yields in the upper Guadalupe River watershed, south-central Texas, 1995-2010 Simulation of streamflow and the effects of brush management on water yields in the upper Guadalupe River watershed, south-central Texas, 1995-2010
The U.S. Geological Survey, in cooperation with the Texas State Soil and Water Conservation Board and the Upper Guadalupe River Authority, developed and calibrated a Soil and Water Assessment Tool watershed model of the upper Guadalupe River watershed in south-central Texas to simulate streamflow and the effects of brush management on water yields in the watershed and to Canyon Lake for...
Authors
Johnathan R. Bumgarner, Florence E. Thompson
Hydrologic, vegetation, and soil data collected in selected wetlands of the Big River Management area, Rhode Island, from 2008 through 2010 Hydrologic, vegetation, and soil data collected in selected wetlands of the Big River Management area, Rhode Island, from 2008 through 2010
The Rhode Island Water Resources Board planned to develop public water-supply wells in the Big River Management Area in Kent County, Rhode Island. Research in the United States and abroad indicates that groundwater withdrawal has the potential to affect wetland hydrology and related processes. In May 2008, the Rhode Island Water Resources Board, the U.S. Geological Survey, and the...
Authors
Meredith S. Borenstein, Francis C. Golet, David S. Armstrong, Robert F. Breault, Timothy D. McCobb, Peter K. Weiskel
Modification of selected South Carolina bridge-scour envelope curves Modification of selected South Carolina bridge-scour envelope curves
Historic scour was investigated at 231 bridges in the Piedmont and Coastal Plain physiographic provinces of South Carolina by the U.S. Geological Survey in cooperation with the South Carolina Department of Transportation. These investigations led to the development of field-derived envelope curves that provided supplementary tools to assess the potential for scour at bridges in South...
Authors
Stephen T. Benedict, Andral W. Caldwell
Flooded area and plant zonation in isolated wetlands in well fields in the Northern Tampa Bay Region, Florida, following reductions in groundwater-withdrawal rates Flooded area and plant zonation in isolated wetlands in well fields in the Northern Tampa Bay Region, Florida, following reductions in groundwater-withdrawal rates
The extent and duration of the flooded area were compared in two reference wetlands and nine wetlands in well fields in the northern Tampa Bay region, Florida, to determine whether reductions in well-field groundwater-withdrawal rates resulted in increases in wetland flooded area. Flooded area, expressed as a percentage of the total wetland area, was used to provide a quantitative and...
Authors
Kim H. Haag, William R. Pfeiffer
Optimum swimming pathways of fish spawning migrations in rivers Optimum swimming pathways of fish spawning migrations in rivers
Fishes that swim upstream in rivers to spawn must navigate complex fluvial velocity fields to arrive at their ultimate locations. One hypothesis with substantial implications is that fish traverse pathways that minimize their energy expenditure during migration. Here we present the methodological and theoretical developments necessary to test this and similar hypotheses. First, a cost...
Authors
Brandon McElroy, Aaron DeLonay, Robert Jacobson
Estimated trichloroethene transformation rates due to naturally occurring biodegradation in a fractured-rock aquifer Estimated trichloroethene transformation rates due to naturally occurring biodegradation in a fractured-rock aquifer
Rates of trichloroethene (TCE) mass transformed by naturally occurring biodegradation processes in a fractured rock aquifer underlying a former Naval Air Warfare Center (NAWC) site in West Trenton, New Jersey, were estimated. The methodology included (1) dividing the site into eight elements of equal size and vertically integrating observed concentrations of two daughter products of TCE
Authors
Francis H. Chapelle, Pierre J. Lacombe, Paul M. Bradley
Characterizing mercury concentrations and fluxes in a Coastal Plain watershed: Insights from dynamic modeling and data Characterizing mercury concentrations and fluxes in a Coastal Plain watershed: Insights from dynamic modeling and data
Mercury (Hg) is one of the leading water quality concerns in surface waters of the United States. Although watershed-scale Hg cycling research has increased in the past two decades, advances in modeling watershed Hg processes in diverse physiographic regions, spatial scales, and land cover types are needed. The goal of this study was to assess Hg cycling in a Coastal Plain system using
Authors
H.E. Golden, C.D. Knightes, P.A. Conrads, G. M. Davis, T.D. Feaster, C.A. Journey, S.T. Benedict, M. E. Brigham, P. M. Bradley
Data collection and compilation for a geodatabase of groundwater, surface-water, water-quality, geophysical, and geologic data, Pecos County Region, Texas, 1930-2011 Data collection and compilation for a geodatabase of groundwater, surface-water, water-quality, geophysical, and geologic data, Pecos County Region, Texas, 1930-2011
The U.S. Geological Survey, in cooperation with Middle Pecos Groundwater Conservation District, Pecos County, City of Fort Stockton, Brewster County, and Pecos County Water Control and Improvement District No. 1, compiled groundwater, surface-water, water-quality, geophysical, and geologic data for site locations in the Pecos County region, Texas, and developed a geodatabase to...
Authors
Daniel K. Pearson, Johnathan R. Bumgarner, Natalie A. Houston, Gregory P. Stanton, Andrew Teeple, Jonathan V. Thomas
The role of fire-return interval and season of burn in snag dynamics in a south Florida slash pine forest The role of fire-return interval and season of burn in snag dynamics in a south Florida slash pine forest
Standing dead trees, or snags, are an important habitat element for many animal species. In many ecosystems, fire is a primary driver of snag population dynamics because it can both create and consume snags. The objective of this study was to examine how variation in two key components of the fire regime—fire-return interval and season of burn—affected population dynamics of snags. Using...
Authors
John D. Lloyd, Gary L. Slater, James R. Snyder