Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 10365
Body composition of wintering canvasbacks in Louisiana: Dominance and survival implications Body composition of wintering canvasbacks in Louisiana: Dominance and survival implications
I studied effects of sex, age, and month on body mass and composition of Canvasbacks (Aythya valisineria) at Catahoula Lake (CL) and the Mississippi River Delta (MRD), Louisiana, in winter 1987-1988. Size-adjusted body mass and fat varied by age, month, and site. Fat levels in immatures were greater at MRD than at CL, but changed similarly at both sites. Adults at MRD were also fatter...
Authors
William L. Hohman
A Geographic Information System procedure to quantify drainage-basin characteristics A Geographic Information System procedure to quantify drainage-basin characteristics
The Basin Characteristics System (BCS) has been developed to quantify characteristics of a drainage basin. The first of four main BCS processing steps creates four geographic information system (GIS) digital maps representing the drainage divide, the drainage network, elevation contours, and the basin length. The drainage divide and basin length are manually digitized from 1:250,000...
Authors
David A. Eash
Determination of mono- and non-o,o′-chlorine substituted polychlorinated biphenyls in Aroclors and environmental samples Determination of mono- and non-o,o′-chlorine substituted polychlorinated biphenyls in Aroclors and environmental samples
High resolution capillary gas chromatography (GC) is the best known technique for the separation of complex mixtures; however, no single GC column has yet separated all 209 congeners of polychlorinated biphenyls (PCBs). A number of coeluting PCB congener pairs exist, and even under favorable separation conditions such as with multidimensional GC, assignment of peak identities to known...
Authors
Ted R. Schwartz, Donald E. Tillitt, Kevin P. Feltz, Paul H. Peterman
Relative effects of nutrient enrichment and grazing on epiphyte-macrophyte (Zostera marina L.) dynamics Relative effects of nutrient enrichment and grazing on epiphyte-macrophyte (Zostera marina L.) dynamics
The independent and interactive effects of nutrient concentration and epiphyte grazers on epiphyte biomass and macrophyte growth and production were examined in Zostera marina L. (eelgrass) microcosms. Experiments were conducted during early summer, late summer, fall, and spring in a greenhouse on the York River estuary of Chesapeake Bay. Nutrient treatments consisted of ambient or...
Authors
Hilary A. Neckles, R. L. Wetzel, R.J. Orth
Sex ratios of canvasbacks wintering in Louisiana Sex ratios of canvasbacks wintering in Louisiana
Disparate sex ratios in waterfowl are considered indicative of differential survival between the sexes and may limit reproductive potential. Because other studies have shown canvasbacks (Aythya valisineria) have highly skewed sex ratios, I examined aerial photographs from surveys flown monthly during winters 1987-88 and 1988-89 to determine sex ratios of canvasbacks in Louisiana where...
Authors
Dennis W. Woolington
Meteorology of the storm of November 3-5, 1985, in West Virginia and Virginia: Chapter B in Geomorphic studies of the storm and flood of November 3-5, 1985, in the upper Potomac and Cheat River basins in West Virginia and Virginia Meteorology of the storm of November 3-5, 1985, in West Virginia and Virginia: Chapter B in Geomorphic studies of the storm and flood of November 3-5, 1985, in the upper Potomac and Cheat River basins in West Virginia and Virginia
The storm of November 3-5, 1985, in the central Appalachian Mountains of West Virginia and Virginia resulted from a complex sequence of meteorological events. The stage was set by Hurricane Juan, which made landfall in the Gulf Coast on October 31. Juan brought moisture northward up the Mississippi Valley; latent heat released by condensation aloft probably helped to render stationary a...
Authors
Stephen J. Colucci, Robert B. Jacobson, Steven Greco
Hydrologic budget and nitrogen distribution for an agricultural study plot in claypan soil and glacial till near Centralia, Mo.--May 1991 to May 1992 Hydrologic budget and nitrogen distribution for an agricultural study plot in claypan soil and glacial till near Centralia, Mo.--May 1991 to May 1992
No abstract available.
Authors
Brian P. Kelly, L.N. Plummer
A geographic information systems approach to the analysis of contaminants in Galveston Bay A geographic information systems approach to the analysis of contaminants in Galveston Bay
No abstract available.
Authors
Marcia McNiff, P.F. Roscigno, Wei Ji
Influence of redox environment and aqueous speciation on metal transport in groundwater: Preliminary results of tracer injection studies Influence of redox environment and aqueous speciation on metal transport in groundwater: Preliminary results of tracer injection studies
No abstract available.
Authors
J. Davis, Kent D. Becher, B.A. Rea, A.S. Maest, S. P. Garabedian
The effects of habitat productivity on competition intensity The effects of habitat productivity on competition intensity
No abstract available.
Authors
James B. Grace
Hydrogeology, water quality, and water-resources development potential of the upper Floridan Aquifer in the Valdosta area, south-central Georgia Hydrogeology, water quality, and water-resources development potential of the upper Floridan Aquifer in the Valdosta area, south-central Georgia
Water quality in the Upper Floridan aquifer in the Valdosta, Georgia area is adversely affected by direct recharge from the Withlacoochee River. Water enters the aquifer along a short reach of the river where sinkholes have formed in the stream bed. The water receives little filtration as it recharges the Upper Floridan aquifer through these sinkholes. Naturally occurring organic...
Authors
J. B. McConnell, C.M. Hacke
Water resources activities, South Carolina District, 1989-91 Water resources activities, South Carolina District, 1989-91
No abstract available.
Authors
S.C. Lambert, M.S. Davenport, G. G. Patterson