Arsenate adsorption mechanisms at the allophane: Water interface
Y. Arai, D.L. Sparks, J.A. Davis
2005, Environmental Science & Technology (39) 2537-2544
We investigated arsenate (As(V)) reactivity and surface speciation on amorphous aluminosilicate mineral (synthetic allophane) surfaces using batch adsorption experiments, powder X-ray diffraction (XRD), and X-ray absorption spectroscopy (XAS). The adsorption isotherm experiments indicated that As(V) uptake increased with increasing [As(V)]o from 50 to 1000 μM (i.e., Langmuir type...
The ecological - Societal underpinnings of Everglades restoration
Fred H. Sklar, M.J. Chimney, S. Newman, P. McCormick, D. Gawlik, S. Miao, C. McVoy, W. Said, J. Newman, C. Coronado, G. Crozier, M. Korvela, K. Rutchey
2005, Conference Paper, Frontiers in Ecology and the Environment
The biotic integrity of the Florida Everglades, a wetland of immense international importance, is threatened as a result of decades of human manipulation for drainage and development. Past management of the system only exacerbated the problems associated with nutrient enrichment and disruption of regional hydrology. The Comprehensive Everglades Restoration Plan...
Aminobacter ciceronei sp. nov. and Aminobacter lissarensis sp. nov., isolated from various terrestrial environments
I.R. McDonald, P. Kampfer, E. Topp, K.L. Warner, M.J. Cox, Hancock T.L. Connell, L.G. Miller, M.J. Larkin, V. Ducrocq, C. Coulter, D.B. Harper, J.C. Murrell, R.S. Oremland
2005, International Journal of Systematic and Evolutionary Microbiology (55) 1827-1832
The bacterial strains IMB-1T and CC495T, which are capable of growth on methyl chloride (CH3Cl, chloromethane) and methyl bromide (CH3Br, bromomethane), were isolated from agricultural soil in California fumigated with CH3Br, and woodland soil in Northern Ireland, respectively. Two pesticide-/herbicide-degrading bacteria, strains ER2 and C147, were isolated...
Geochemistry of speleothem records from southern Illinois: Development of (234U)/(238U) as a proxy for paleoprecipitation
Juanzuo Zhou, C.C. Lundstrom, B. Fouke, S. Panno, K. Hackley, B. Curry
2005, Chemical Geology (221) 1-20
Natural waters universally show fractionation of uranium series (U-series) parent-daughter pairs, with the disequilibrium between 234U and 238U (234U)/(238U) commonly used as a tracer of groundwater flow. Because speleothems provide a temporal record of geochemical variations in groundwater precipitating calcite, (234U)/(238U) variations in speleothems provide a unique method of investigating...
Hydrologic changes in urban streams and their ecological significance
C.P. Konrad, D. B. Booth
2005, American Fisheries Society Symposium (2005) 157-177
Urban development modifies the production and delivery of runoff to streams and the resulting rate, volume, and timing of streamflow. Given that streamflow demonstrably influences the structure and composition of lotic communities, we have identified four hydrologic changes resulting from urban development that are potentially significant to stream ecosystems: increased...
Improved prediction of octanol-water partition coefficients from liquid-solute water solubilities and molar volumes
C. T. Chiou, D.W. Schmedding, M. Manes
2005, Environmental Science & Technology (39) 8840-8846
A volume-fraction-based solvent−water partition model for dilute solutes, in which the partition coefficient shows a dependence on solute molar volume ( ), is adapted to predict the octanol−water partition coefficient (Kow) from the liquid or supercooled-liquid solute water solubility (Sw), or vice versa. The established correlation is...
A decrease in discharge-normalized DOC export by the Yukon River during summer through autumn
Robert G. Striegl, G. R. Aiken, M.M. Dornblaser, P.A. Raymond, K.P. Wickland
2005, Geophysical Research Letters (32) 1-4
Climate warming is having a dramatic effect on the vegetation distribution and carbon cycling of terrestrial subarctic and arctic ecosystems. Here, we present hydrologic evidence that warming is also affecting the export of dissolved organic carbon and bicarbonate (DOC and HCO3−) at the large basin scale. In the 831,400 km2 Yukon...
Effects of urbanization on the geomorphology, habitat, hydrology, and fish index of biotic integrity of streams in the Chicago area, Illinois and Wisconsin
F. A. Fitzpatrick, M.W. Diebel, M.A. Harris, T.L. Arnold, M.A. Lutz, K.D. Richards
2005, American Fisheries Society Symposium (2005) 87-115
Effects of urbanization on geomorphic, habitat, and hydrologic characteristics and fish biotic integrity of 45 streams in the Chicago area were examined by the U.S. Geological Survey from 2000 to 2001. An agricultural to urban land-cover gradient approach was used. Landscape characteristics such as texture of surficial deposits, slope, riparian...
Effects of suburban development on runoff generation in the Croton River basin, New York, USA
Douglas A. Burns, T. Vitvar, J. McDonnell, J. Hassett, J. Duncan, Carol Kendall
2005, Journal of Hydrology (311) 266-281
The effects of impervious area, septic leach-field effluent, and a riparian wetland on runoff generation were studied in three small (0.38–0.56 km2) headwater catchments that represent a range of suburban development (high density residential, medium density residential, and undeveloped) within the Croton River basin, 70 km north of New York City. Precipitation, stream...
Evidence and implications of recent climate change in Northern Alaska and other Arctic regions
L. D. Hinzman, N.D. Bettez, W.R. Bolton, F.S. Chapin, M.B. Dyurgerov, C.L. Fastie, B. Griffith, R.D. Hollister, Allen Hope, H.P. Huntington, A.M. Jensen, G.J. Jia, T. Jorgenson, D.L. Kane, D.R. Klein, G. Kofinas, A.H. Lynch, A.H. Lloyd, A. D. McGuire, Frederick E. Nelson, W.C. Oechel, T.E. Osterkamp, C.H. Racine, V.E. Romanovsky, R. S. Stone, D.A. Stow, M. Sturm, C.E. Tweedie, G.L. Vourlitis, M.D. Walker, D.A. Walker, P.J. Webber, J.M. Welker, K.S. Winker, K. Yoshikawa
2005, Climatic Change (72) 251-298
The Arctic climate is changing. Permafrost is warming, hydrological processes are changing and biological and social systems are also evolving in response to these changing conditions. Knowing how the structure and function of arctic terrestrial ecosystems are responding to recent and persistent climate change is paramount to understanding the future...
Impact of land use and land cover change on groundwater recharge and quality in the southwestern US
Bridget R. Scanlon, Robert C. Reedy, David A. Stonestrom, David E. Prudic, Kevin F. Dennehy
2005, Global Change Biology (11) 1577-1593
Humans have exerted large‐scale changes on the terrestrial biosphere, primarily through agriculture; however, the impacts of such changes on the hydrologic cycle are poorly understood. The purpose of this study was to test the hypothesis that the conversion of natural rangeland ecosystems to agricultural ecosystems impacts the subsurface portion of...
Reconstructing a mid-Cretaceous landscape from paleosols in western Canada
David F. Ufnar, Luis A. Gonzalez, Greg A. Ludvigson, Richard L. Brenner, B.J. Witzke, D. Leckie
2005, Journal of Sedimentary Research (75) 984-996
The Albian Stage of the mid-Cretaceous was a time of equable climate conditions with high sea levels and broad shallow epeiric seas that may have had a moderating affect on continental climates. A Late Albian landscape surface that developed during a regression and subsequent sea-level rise in the Western Canada...
Assessing water source and channel type as factors affecting benthic macroinvertebrate and periphyton assemblages in the highly urbanized Santa Ana River Basin, California
Carmen A. Burton, Larry R. Brown, Kenneth Belitz
2005, American Fisheries Society Symposium (2005) 239-262
The Santa Ana River basin is the largest stream system in Southern California and includes a densely populated coastal area. Extensive urbanization has altered the geomorphology and hydrology of the streams, adversely affecting aquatic communities. We studied macroinvertebrate and periphyton assemblages in relation to two categorical features of the highly...
Delineating copper accumulation pathways for the freshwater bivalve Corbicula using stable copper isotopes
M.-N. Croteau, S. N. Luoma
2005, Environmental Toxicology and Chemistry (24) 2871-2878
Delineation of metal uptake routes in aquatic invertebrates is critical for characterizing bioaccumulation dynamics and assessing risks associated with metal exposure. Here we demonstrate that Cu stable isotopic ratios can be manipulated in both exposure media and algae to determine the efflux rate constant (ke) and...
Steam injection pilot study in a contaminated fractured limestone (Maine, USA): Modeling and analysis of borehole radar reflection data
C. Gregoire, J.W. Lane Jr., P. K. Joesten
2005, Conference Paper, Proceedings of the 3rd International Workshop on Advanced Ground Penetrating Radar, IWAGPR 2005
Steam-enhanced remediation (SER) has been successfully used to remove DNAPL and LNAPL contaminants in porous media. Between August and November 2002, SER was tested in fractured limestone at the former Loring Air Force Base, in Maine, USA. During the SER investigation, the U.S. Geological Survey conducted a series of borehole...
Transport and fate of nitrate and pesticides: Hydrogeology and riparian zone processes
L.J. Puckett, W.B. Hughes
2005, Journal of Environmental Quality (34) 2278-2292
There is continuing concern over potential impacts of widespread application of nutrients and pesticides on ground- and surface-water quality. Transport and fate of nitrate and pesticides were investigated in a shallow aquifer and adjacent stream, Cow Castle Creek, in Orangeburg County, South Carolina. Pesticide and pesticide degradate concentrations were detected...
Coupled inverse modeling of vadose zone water, heat, and solute transport: Calibration constraints, parameter nonuniqueness, and predictive uncertainty
M.J. Friedel
2005, Journal of Hydrology (312) 148-175
In this study, an inverse methodology is presented and used to evaluate the effect that calibration of a synthetic artificial recharge model, constrained by different combinations of measurements (pressure head, temperature, and concentration), has on estimated vadose zone model parameter-value nonuniqueness and predictive water, heat, and solute transport uncertainty. Several...
A method adapting microarray technology for signature tagged mutagenesis of Dusulfovibrio dusulfuricans G20 and Shewanella oneidensis MR-1 in anaerobic sediment survival experiments
Jennifer L. Groh, Qingwei Luo, Jimmy D. Ballard, Lee R. Krumholz
2005, Applied and Environmental Microbiology (71) 7064-7074
Signature-tagged mutagenesis (STM) is a powerful technique that can be used to identify genes expressed by bacteria during exposure to conditions in their natural environments. To date, there have been no reports of studies in which this approach was used to study organisms of environmental, rather than pathogenic, significance. We...
Does biofilm contribute to diel cycling of Zn in High Ore Creek, Montana?
J.M. Morris, D. A. Nimick, A.M. Farag, J.S. Meyer
2005, Biogeochemistry (76) 233-259
Concentrations of metals cycle daily in the water column of some mining-impacted streams in the Rocky Mountains of the western USA. We hypothesized that biofilm in High Ore Creek, Montana, USA, sorbs and releases Zn on a diel cycle, and this uptake-and-release cycle controls the total and dissolved (0.45-μm filtered)...
Role for Fe(III) minerals in nitrate-dependent microbial U(IV) oxidation
John M. Senko, Yasser Mohamed, Thomas A. Dewers, Lee R. Krumholz
2005, Environmental Science & Technology (39) 2529-2536
Microbiological reduction of soluble U(VI) to insoluble U(IV) is a means of preventing the migration of that element in groundwater, but the presence of nitrate in U(IV)-containing sediments leads to U(IV) oxidation and remobilizaton. Nitrite or iron(III) oxyhydroxides may oxidize U(IV) under nitrate-reducing conditions, and we determined the rate and...
Effects of coal-bed methane discharge waters on the vegetation and soil ecosystem in Powder River Basin, Wyoming
M. Stearns, J.A. Tindall, G. Cronin, M.J. Friedel, E. Bergquist
2005, Water, Air, & Soil Pollution (168) 33-57
Coal-bed methane (CBM) co-produced discharge waters in the Powder River Basin of Wyoming, resulting from extraction of methane from coal seams, have become a priority for chemical, hydrological and biological research during the last few years. Soil and vegetation samples were taken from affected and reference sites (upland elevations...
Herbicide and degradate flux in the Yazoo River Basin
R.H. Coupe, H.L. Welch, A.B. Pell, E.M. Thurman
2005, International Journal of Environmental Analytical Chemistry (85) 1127-1140
During 1996-1997, water samples were collected from five sites in the Yazoo River Basin and analysed for 14 herbicides and nine degradates. These included acetochlor, alachlor, atrazine, cyanazine, fluometuron, metolachlor, metribuzin, molinate, norflurazon, prometryn, propanil, propazine, simazine, trifluralin, three degradates of fluometuron, two degradates of atrazine,...
Status and conservation of the fish fauna of the Alabama River system
Mary C. Freeman, E.R. Irwin, N.M. Burkhead, B. J. Freeman, H.L. Bart Jr.
2005, American Fisheries Society Symposium (2005) 557-585
The Alabama River system, comprising the Alabama, Coosa, and Tallapoosa subsystems, forms the eastern portion of the Mobile River drainage. Physiographic diversity and geologic history have fostered development in the Alabama River system of globally significant levels of aquatic faunal diversity and endemism. At least 184 fishes are native to...
Nonlinear dynamics in ecosystem response to climatic change: Case studies and policy implications
Virginia R. Burkett, Douglas A. Wilcox, Robert Stottlemyer, Wylie Barrow, Dan Fagre, Jill Baron, Jeff Price, Jennifer L. Nielsen, Craig D. Allen, David L. Peterson, Greg Ruggerone, Thomas Doyle
2005, Ecological Complexity (2) 357-394
Many biological, hydrological, and geological processes are interactively linked in ecosystems. These ecological phenomena normally vary within bounded ranges, but rapid, nonlinear changes to markedly different conditions can be triggered by even small differences if threshold values are exceeded. Intrinsic and extrinsic ecological thresholds can lead to effects that cascade...
Biology and invasive species in the western U.S
Water Resources Division, U.S. Geological Survey
2005, Fact Sheet 2005-3006
The diversity of environments that characterizes the West is responsible for the region's rich biological heritage. This ecological diversity also means that opportunities for invasive species are many, varied, and complex. Island ecosystems are notoriously vulnerable to invaders as demonstrated in Hawaii and West Coast offshore islands. Aquatic invaders impose...
