Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 10420
A 7 year record of above-ground net primary production in a southeastern Mexican mangrove forest A 7 year record of above-ground net primary production in a southeastern Mexican mangrove forest
Spatial and temporal variations in net above-ground primary production (NPP) and litter turnover rate were studied, from 1987 to 1993, in a mangrove forest bordering Laguna de Terminos, Mexico. NPP, the sum of total litter fall and wood production, was measured over the entire study period in three zones in a basin forest: zone I, where Rhizophora mangle (red mangrove) occurs but...
Authors
J.W. Day, Carlos Coronado-Molina, F. R. Vera-Herrera, R. Twilley, V. H. Rivera-Monroy, V. H. Alvarez-Guillen, Richard H. Day, William Conner
Water-quality assessment of the Trinity River Basin, Texas — Pesticides in streams draining an urban and an agricultural area, 1993-95 Water-quality assessment of the Trinity River Basin, Texas — Pesticides in streams draining an urban and an agricultural area, 1993-95
Water and bed-sediment samples from streams draining an urban and an agricultural area in the Trinity River Basin, Texas, were analyzed. The samples were collected during March 1993?September 1995 by the Trinity River Basin study-unit team of the National Water-Quality Assessment Program. A comparison of pesticide data for water samples from seven streams in the Dallas-Fort Worth urban...
Authors
Larry F. Land, Mariann F. Brown
The life-history and conservation biology of an island population of Florida box turtles Terrapene carolina bauri The life-history and conservation biology of an island population of Florida box turtles Terrapene carolina bauri
No abstract available.
Authors
C. Kenneth Dodd, R. Franz
Water resources data Texas, water year 1995, volume 3. Colorado River basin, Lavaca River basin, Guadalupe River basin, Nueces River basin, Rio Grande basin, and intervening coastal basins Water resources data Texas, water year 1995, volume 3. Colorado River basin, Lavaca River basin, Guadalupe River basin, Nueces River basin, Rio Grande basin, and intervening coastal basins
No abstract available.
Authors
S. C. Gandara, W.J. Gibbons, F.L. Andrews, J.C. Fisher, B.A. Hinds, R. E. Jones
Water resources data, Iowa, water year 1995 Water resources data, Iowa, water year 1995
No abstract available.
Authors
J.E. May, J.G. Gorman, R.D. Goodrich, M.W. Bobier, V.E. Miller
Floods of July 12, 1972, March 19, 1979, and June 15, 1991, in the Turkey River Basin, northeast Iowa Floods of July 12, 1972, March 19, 1979, and June 15, 1991, in the Turkey River Basin, northeast Iowa
Water-surface-elevation profiles and peak discharges for the floods of July 12, 1972, March 19, 1979, and June 15, 1991, in the Turkey River Basin, northeast Iowa, are presented in this report. The profiles illustrate the 1979 and 1991 floods along the Turkey River in Fayette and Clayton Counties and along the Volga River in Clayton County; the 1991 flood along Roberts Creek in Clayton...
Authors
D. A. Eash, B.A. Koppensteiner
Geologic framework and hydrogeologic characteristics of the Edwards aquifer outcrop (Barton Springs segment), northeastern Hays and southwestern Travis Counties, Texas Geologic framework and hydrogeologic characteristics of the Edwards aquifer outcrop (Barton Springs segment), northeastern Hays and southwestern Travis Counties, Texas
The hydrogeologic subdivisions within the Barton Springs segment of the Edwards aquifer outcrop in northeastern Hays and southwestern Travis Counties generally are porous and permeable. The most porous and permeable appear to be hydrogeologic subdivision VI, the Kirschberg evaporite member of the Kainer Formation; and hydrogeologic subdivision III, the leached and collapsed members...
Authors
Ted A. Small, John A. Hanson, Nico M. Hauwert
A two-step experimental design for a sediment bioassay using growth of the amphipod Hyalella azteca for the test end point A two-step experimental design for a sediment bioassay using growth of the amphipod Hyalella azteca for the test end point
We designed a sediment bioassay using 25% growth inhibition of Hyalella azteca as the end point.Hyalella azteca exhibits size-specific fecundity, so growth is a surrogate of reproductive production. We investigated density effects on growth to address whether crowding could affect test interpretation; amphipods in 14,000/m2 exposures were 16 to 20% smaller than those at 7,000/m2. Using...
Authors
Jody A. Kubitz, John M. Besser, John P. Giesy
A field investigation of the relationship between zinc and acid volatile sulfide concentrations in freshwater sediments A field investigation of the relationship between zinc and acid volatile sulfide concentrations in freshwater sediments
Understanding relationships between cationic metals such as cadmium, copper, nickel, lead and zinc, and amorphous iron sulfides, measured as acid volatile sulfide (AVS), is key to predicting metal bioavailability and toxicity insediments. The objective of the present study was to assess seasonal and spatial variations of AVS in freshwater sediments contaminated with zinc. Sediments were...
Authors
Gerald T. Ankley, Karsten Liber, Daniel J. Call, Thomas P. Markee, Timothy J. Canfield, Christopher G. Ingersoll
Species richness and biogeography of the herpetophauna in the Exuma Cays Land and Sea Park, Bahamas Species richness and biogeography of the herpetophauna in the Exuma Cays Land and Sea Park, Bahamas
Abstract not supplied at this time
Authors
C.K. Dodd, R. Franz
Estimates of abundance of box turtles (Terrapene carolina bauri) on a Florida island Estimates of abundance of box turtles (Terrapene carolina bauri) on a Florida island
Abstract not supplied at this time
Authors
C.A. Langtimm, C.K. Dodd, R. Franz
Hydrogeology at Air Force Plant 4 and vicinity and water quality of the Paluxy Aquifer, Fort Worth, Texas Hydrogeology at Air Force Plant 4 and vicinity and water quality of the Paluxy Aquifer, Fort Worth, Texas
Ground water in the surficial terrace alluvial aquifer is contaminated at Air Force Plant 4, Fort Worth, Texas, and at the adjacent Naval Air Station. Some of the contaminated water has leaked from the terrace alluvial aquifer to an uppermost interval of the Paluxy Formation (the Paluxy "upper sand") beneath the east parking lot, east of the assembly building, and to the upper and middle...
Authors
Eve L. Kuniansky, Sonya A. Jones, Robert D. Brock, M.D. Williams