Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 10486
Acute toxicity of the herbicide bromoxynil to Daphnia magna Acute toxicity of the herbicide bromoxynil to Daphnia magna
The acute toxicities of technical-grade bromoxynil octanoate (BO) and two commercial formulations, Buctril® and Bronate®, to 24-h-old neonate Daphnia magna (Straus) were determined in soft, hard, and oligosaline water. In addition, effects of life stage, feeding, aging the herbicide, and exposure duration on BO toxicity to daphnids were investigated. Regardless of formulation, life...
Authors
Kevin J. Buhl, Steven J. Hamilton, James C. Schmulbach
Hydrologic and water-quality data in selected agricultural drainages in Beaufort and Hyde Counties, North Carolina, 1990-92 Hydrologic and water-quality data in selected agricultural drainages in Beaufort and Hyde Counties, North Carolina, 1990-92
An investigation was begun in 1988 to: (1) quantify nutrient, sediment, and freshwater loadings in canals that collect drainage from cropland field ditches; (2) determine the effects of tide gates and flashboard risers on these loadings and on receiving water quality; and (3) characterize the effects of drainage on the salinity regime of a tidal creek. Data were collected in three canals...
Authors
M. W. Treece
Using GIS to determine the effects of contaminated sediments on natural resources in an estuary Using GIS to determine the effects of contaminated sediments on natural resources in an estuary
No abstract available.
Authors
P.F. Roscigno, G. M. Martin, J. B. Johnston, Mary C. Watzin
A geographic information systems technique for monitoring contaminants in Galveston Bay, Texas A geographic information systems technique for monitoring contaminants in Galveston Bay, Texas
A geographic information system (GIS) was used to compile a series of databases containing details concerning metal contamination and pollution sources to study their impacts on the Galveston Bay (TX) ecosystem. Using these databases, a series of maps with various overlays was created with ARC/INFO software. These maps allowed patterns of spatial distribution of numerous variables to be...
Authors
Marcia McNiff, P.F. Roscigno, W. Ji
Multiple temporal and spatial remote sensing data as inputs into a landcover resource geographic information system Multiple temporal and spatial remote sensing data as inputs into a landcover resource geographic information system
No abstract available.
Authors
Elijah Ramsey III, Craig A. Johnson
Preliminary analysis of spectral data collected for the purpose of wetland discrimination Preliminary analysis of spectral data collected for the purpose of wetland discrimination
No abstract available.
Authors
Elijah Ramsey III, R. Spell, James B. Johnston
Knowledge-based gis approaches: A prototype expert system for wetland resource management Knowledge-based gis approaches: A prototype expert system for wetland resource management
No abstract available.
Authors
Wei Ji, James B. Johnston, Marcia McNiff, Loyd C. Mitchell
Canvasback food density in the Mississippi River Delta: Habitat and temporal differences Canvasback food density in the Mississippi River Delta: Habitat and temporal differences
No abstract available
Authors
Ronald R. Bielefeld, Alan D. Afton
Ecology and management of postbreeding waterfowl Ecology and management of postbreeding waterfowl
No abstract available.
Authors
William L. Hohman, C. Davison Ankney, David H. Gordon
Size bias in traditional analyses of substitutive competition experiments Size bias in traditional analyses of substitutive competition experiments
The objective of this study was to examine the claim that traditional measures of competitive performance in substitutive experiments are biased towards larger plants. Results from a three-year diallele experiment of 6 marsh plant species were analyzed using both Relative Yields (a traditional analysis) and the Relative Efficiency Index (a recently proposed analysis presumed to be size...
Authors
James B. Grace, Janet R. Keough, Glenn R. Guntenspergen
Regional evaluations of acid deposition effects on forests: Eastern spruce-fir Regional evaluations of acid deposition effects on forests: Eastern spruce-fir
Having reviewed the results of the Integrated Forest Study (IFS) project, we now try to place the results in a larger perspective by very briefly summarizing acid deposition effects and their potential role in forest health in the several forest types represented in the IFS project. This chapter gives brief overviews of the situation in eastern spruce-fir, eastern hardwood, and southern...
Authors
A. H. Johnson, A. J. Friedland, E. K. Miller, J. J. Battles, Thomas G. Huntington, D. R. Vann, G. R. Strimbeck
Flow cytometry, morphometry and histopathology as biomarkers of benzo[a]pyrene exposure in brown bullheads (ameiurus nebulosus) Flow cytometry, morphometry and histopathology as biomarkers of benzo[a]pyrene exposure in brown bullheads (ameiurus nebulosus)
Brown bullheads were given a single intraperitoneal dose of 0, 5, 25 or 125 mg kg−1 benzo[a]pyrene (BaP), a carcinogenic polycyclic aromatic hydrocarbon, and evaluated over 18 months. Flow cytometric analyses of hepatocyte DNA content indicated an increase in DNA synthesis in BaP-exposed fish prior to day 14 post-exposure. Thereafter, all flow cytometric variables returned to initial...
Authors
Andrew W. Grady, Ronald M. McLaughlin, Charles W. Caldwell, Christopher J. Schmitt, David L. Stalling