Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 10361
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
Herbicide and nitrate variation in alluvium underlying a cornfield at a site in Iowa County, Iowa Herbicide and nitrate variation in alluvium underlying a cornfield at a site in Iowa County, Iowa
A hydrologic investigation to determine vertical and seasonal variation of atrazine, alachlor, cyanazine, and nitrate at one location and to relate the variation to ground-water movement in the Iowa River alluvium was conducted in Iowa County, Iowa, from March 1986 to December 1987. Water samples were collected at discrete intervals through the alluvial sequence from the soil zone to the...
Authors
S. J. Kalkhoff, M.G. Detroy, K. Cherryholmes, R.L. Kuzniar
Factors influencing the distribution of blackchin tilapia Sarotherodon melanotherodon (Osteichthyes: Cichlidae) in the Indian River system, Florida Factors influencing the distribution of blackchin tilapia Sarotherodon melanotherodon (Osteichthyes: Cichlidae) in the Indian River system, Florida
The blackchin tilapia, Sarotherodon melanotheron, was first collected from the Indian River system, in Brevard County, Florida, in 1980. Since its introduction, this species has expanded its range northward along the coast approximately 37 km, to just north of Whites Point, Brevard County, and southward about 68 km to Vero Beach, Indian River County. Laboratory studies on salinity...
Authors
Dawn P. Jennings, J.D. Williams
Alternate reproductive strategies in the California gull Alternate reproductive strategies in the California gull
We analysed 6 years of reproduction data for 176 California gulls (Larus californicus) surviving from 1980 to 1988. Using a statistical model adapted from Rao's (1958) and Tucker's (1966) generalized growth curve analysis, we reconstructed the reproductive patterns of gulls aged from 0 to 26 years. Individuals were highly consistent in following one of two patterns of reproduction. In a...
Authors
Bruce H. Pugesek, P. Wood
Selective dipnetting of largemouth bass during electrofishing Selective dipnetting of largemouth bass during electrofishing
We electrofished 10 north‐central Texas reservoirs from 1987 through 1990 by either dipnetting all electroshocked fish (intensive dipnetting) or selectively dipnetting only fish visually identified as largemouth bass Micropterus salmoides. We compared selected indices of population structure (proportional stock density, relative stock density, and young–adult ratio) and abundance (catch...
Authors
Daniel J. Twedt, W. Clell Guest, Bobby W. Farquhar