Microbial transformations of arsenic in the environment: From soda lakes to aquifers
J.R. Lloyd, R.S. Oremland
2006, Elements (2) 85-90
Arsenic is a highly toxic element that supports a surprising range of biogeochemical transformations. The biochemical basis of these microbial interactions is described, with an emphasis on energy-yielding redox biotransformations that cycle between the As5+ and As3+ oxidation states. The subsequent impact of As3+-oxidising and As 5+-reducing prokaryotes on the...
Redox potential characterization and soil greenhouse gas concentration across a hydrological gradient in a Gulf coast forest
K. Yu, S.P. Faulkner, W.H. Patrick Jr.
2006, Chemosphere (62) 905-914
Soil redox potential (Eh), concentrations of oxygen (O2) and three greenhouse gases (CO2, CH4, and N2O) were measured in the soil profile of a coastal forest at ridge, transition, and swamp across a hydrological gradient. The results delineated a distinct boundary in soil Eh and O2 concentration between the ridge...
Role of microbial iron reduction in the dissolution of iron hydroxysulfate minerals
E.J.P. Jones, T.-L. Nadeau, M.A. Voytek, E. R. Landa
2006, Journal of Geophysical Research G: Biogeosciences (111)
Iron-hydroxysulfate minerals can be important hosts for metals such as lead, mercury, copper, zinc, silver, chromium, arsenic, and selenium and for radionuclides such as 226Ra. These mineral-bound contaminants are considered immobilized under oxic conditions. However, when anoxic conditions develop, the activities of sulfate- or iron-reducing bacteria could result in mineral...
Hydrologic-hydraulic analysis of the Toa Vaca Dam
T.-S. Heriberto, A.C. MillerArthur
2006, Conference Paper, Association of State Dam Safety Officials - Dam Safety 2006, Proceedings from the 2006 Annual Conference
[No abstract available]...
Partitioning evapotranspiration in sparsely vegetated rangeland using a portable chamber
David I. Stannard, Mark A. Weltz
2006, Water Resources Research (42)
A portable chamber was used to separate evapotranspiration (ET) from a sparse, mixed‐species shrub canopy in southeastern Arizona, United States, into vegetation and soil components. Chamber measurements were made of ET from the five dominant species, and from bare soil, on 3 days during the monsoon season when the soil surface was...
An evaluation of factors influencing pore pressure in accretionary complexes: Implications for taper angle and wedge mechanics
D.M. Saffer, B.A. Bekins
2006, Journal of Geophysical Research B: Solid Earth (111)
At many subduction zones, accretionary complexes form as sediment is off-scraped from the subducting plate. Mechanical models that treat accretionary complexes as critically tapered wedges of sediment demonstrate that pore pressure controls their taper angle by modifying basal and internal shear strength. Here, we combine a numerical model of groundwater...
Sulfate deposition in subsurface regolith in Gusev crater, Mars
A. Wang, L.A. Haskin, S. W. Squyres, B.L. Jolliff, L. Crumpler, Ralf Gellert, C. Schroder, Kenneth E. Herkenhoff, J. Hurowitz, N.J. Tosca, W. H. Farrand, R. Anderson, A.T. Knudson
2006, Journal of Geophysical Research E: Planets (111)
Excavating into the shallow Martian subsurface has the potential to expose stratigraphic layers and mature regolith, which may hold a record of more ancient aqueous interactions than those expected under current Martian surface conditions. During the Spirit rover's exploration of Gusev crater, rover wheels were used to dig three trenches...
Kinetics of sorption and abiotic oxidation of arsenic(III) by aquifer materials
A. Amirbahman, D.B. Kent, G.P. Curtis, J.A. Davis
2006, Geochimica et Cosmochimica Acta (70) 533-547
The fate of arsenic in groundwater depends largely on its interaction with mineral surfaces. We investigated the kinetics of As(III) oxidation by aquifer materials collected from the USGS research site at Cape Cod, MA, USA, by conducting laboratory experiments. Five different solid samples with similar specific surface areas (0.6–0.9 m2 g−1) and...
Application of environmental tracers to mixing, evolution, and nitrate contamination of ground water in Jeju Island, Korea
D.-C. Koh, Niel Plummer, Solomon D. Kip, E. Busenberg, Y.-J. Kim, H.-W. Chang
2006, Journal of Hydrology (327) 258-275
Tritium/helium-3 (3H/3He) and chlorofluorocarbons (CFCs) were investigated as environmental tracers in ground water from Jeju Island (Republic of Korea), a basaltic volcanic island. Ground-water mixing was evaluated by comparing 3H and CFC-12 concentrations with lumped-parameter dispersion models, which distinguished old water recharged before the 1950s...
Larval exposure to environmentally relevant mixtures of alkylphenolethoxylates reduces reproductive competence in male fathead minnows
T.J. Bistodeau, L. B. Barber, S.E. Bartell, R.A. Cediel, K.J. Grove, J. Klaustermeier, J.C. Woodard, K. E. Lee, H.L. Schoenfuss
2006, Aquatic Toxicology (79) 268-277
The ubiquitous presence of nonylphenolethoxylate/octylphenolethoxylate (NPE/OPE) compounds in aquatic environments adjacent to wastewater treatment plants (WWTP) warrants an assessment of the endocrine disrupting potential of these complex mixtures on aquatic vertebrates. In this study, fathead minnow larvae were exposed for 64 days to a...
Relations between climatic variability and hydrologic time series from four alluvial basins across the southwestern United States
R. T. Hanson, M. D. Dettinger, M.W. Newhouse
2006, Hydrogeology Journal (14) 1122-1146
Hydrologic time series of groundwater levels, streamflow, precipitation, and tree-ring indices from four alluvial basins in the southwestern United States were spectrally analyzed, and then frequency components were reconstructed to isolate variability due to climatic variations on four time scales. Reconstructed components (RCs), from each time series, were compared to...
From agricultural geology to hydropedology: Forging links within the twenty-first-century geoscience community
E. R. Landa
Frossard E.Blum W.E.H.Warkentin B.P., editor(s)
2006, Geological Society Special Publication 133-140
Despite historical linkages, the fields of geology and soil science have developed along largely divergent paths in the United States during much of the mid- to late-twentieth century. The shift in recent decades within both disciplines, towards greater emphasis on environmental-quality issues and a systems approach, has created new opportunities...
A water-budget approach to restoring a sedge fen affected by diking and ditching
Douglas A. Wilcox, Michael J. Sweat, Martha L. Carlson, Kurt P. Kowalski
2006, Journal of Hydrology (320) 501-517
A vast, ground-water-supported sedge fen in the Upper Peninsula of Michigan, USA was ditched in the early 1900s in a failed attempt to promote agriculture. Dikes were later constructed to impound seasonal sheet surface flows for waterfowl management. The US Fish and Wildlife Service, which now manages the wetland as...
Users' manual for the Hydroecological Integrity Assessment Process software (including the New Jersey Assessment Tools)
James A. Henriksen, John Heasley, Jonathan G. Kennen, Steven Nieswand
2006, Open-File Report 2006-1093
This manual is a user’s guide to four computer software tools that have been developed for the Hydroecological Integrity Assessment Process. The Hydroecological Integrity Assessment Process recognizes that streamflow is strongly related to many critical physiochemical components of rivers, such as dissolved oxygen, channel geomorphology, and water temperature, and can...
2005 annual progress report: Elk and bison grazing ecology in the Great Sand Dunes complex of lands
Kate A. Schoenecker, Bruce C. Lubow, Linda Zeigenfuss, Julie Mao
2006, Open-File Report 2006-1267
In 2000 the U.S. Congress authorized the expansion of the former Great Sand Dunes National Monument by establishing a new Great Sand Dunes National Park and Preserve in its place, and establishing the Baca National Wildlife Refuge. The establishment of Great Sand Dunes National Park and Preserve and the new...
Reply to comment on ‘Characterization of surface and ground water δ18O seasonal variation and its use for estimating groundwater residence times’ by R. E. Criss and W. E. Winston
Michael M. Reddy, Paul Schuster, Carol Kendall, Micaela B. Reddy
2006, Hydrological Processes (20) 3573-3578
No abstract available ...
Control of invasive weeds with prescribed burning
Joseph M. DiTomaso, Matthew L. Brooks, Edith B. Allen, Ralph Minnich, Peter M. Rice, Guy B. Kyser
2006, Weed Technology (20) 535-548
Prescribed burning has primarily been used as a tool for the control of invasive late-season annual broadleaf and grass species, particularly yellow starthistle, medusahead, barb goatgrass, and several bromes. However, timely burning of a few invasive biennial broadleaves (e.g., sweetclover and garlic mustard), perennial grasses (e.g., bluegrasses and smooth brome),...
Arsenic and selenium in microbial metabolism
John F. Stolz, Partha Basu, Joanne M. Santini, Ronald S. Oremland
2006, Annual Review of Microbiology (60) 107-130
Arsenic and selenium are readily metabolized by prokaryotes, participating in a full range of metabolic functions including assimilation, methylation, detoxification, and anaerobic respiration. Arsenic speciation and mobility is affected by microbes through oxidation/reduction reactions as part of resistance and respiratory processes. A robust arsenic cycle has been demonstrated in diverse...
Michigan Water Year 2005
S. P. Blumer, C.R. Whited, J.M. Ellis, R. J. Minnerick, R.L. LeuVoy
2006, Water Resources Data MI-05-1
This volume of the annual hydrologic data report of Michigan is one of a series of annual reports that document hydrologic data gathered from the U.S. Geological Survey's surface- and ground-water data-collection networks in each state, Puerto Rico, and the Trust Territories. These records of streamflow, ground-water levels, and quality...
Predicting crappie recruitment in Ohio reservoirs with spawning stock size, larval density, and chlorophyll concentrations
David B. Bunnell, R. Scott Hale, Michael J. Vanni, Roy A. Stein
2006, North American Journal of Fisheries Management (26) 1-12
Stock-recruit models typically use only spawning stock size as a predictor of recruitment to a fishery. In this paper, however, we used spawning stock size as well as larval density and key environmental variables to predict recruitment of white crappies Pomoxis annularis and black crappies P. nigromaculatus, a genus notorious...
Modeling wetland plant community response to assess water-level regulation scenarios in the Lake Ontario-St. Lawrence River basin
Christiane Hudon, Douglas Wilcox, Joel Ingram
2006, Environmental Monitoring and Assessment (113) 303-328
The International Joint Commission has recently completed a five-year study (2000-2005) to review the operation of structures controlling the flows and levels of the Lake Ontario - St. Lawrence River system. In addition to addressing the multitude of stakeholder interests, the regulation plan review also considers environmental sustainability and integrity...
Transverse and longitudinal variation in woody riparian vegetation along a montane river
Jonathan M. Friedman, G.T. Auble, E.D. Andrews, G. Kittel, R.F. Madole, E.R. Griffin, Tyler M. Allred
2006, Western North American Naturalist (66) 78-91
This study explores how the relationship between flow and riparian vegetation varies along a montane river. We mapped occurrence of woody riparian plant communities along 58 km of the San Miguel River in southwestern Colorado. We determined the recurrence interval of inundation for each plant community by combining step-backwater hydraulic...
Methods Used to Assess the Susceptibility to Contamination of Transient, Non-Community Public Ground-Water Supplies in Indiana
Leslie D. Arihood, David A. Cohen
2006, Scientific Investigations Report 2005-5059
The Safe Water Drinking Act of 1974 as amended in 1996 gave each State the responsibility of developing a Source-Water Assessment Plan (SWAP) that is designed to protect public-water supplies from contamination. Each SWAP must include three elements: (1) a delineation of the source-water protection area, (2) an inventory of...
Evidence for intensification of the global water cycle: Review and synthesis
Thomas G. Huntington
2006, Journal of Hydrology (319) 83-95
One of the more important questions in hydrology is: if the climate warms in the future, will there be an intensification of the water cycle and, if so, the nature of that intensification? There is considerable interest in this question because an intensification of the water cycle may lead to changes in water-resource availability,...
Evaluation of metal loading to streams near Creede, Colorado, August and September 2000
B. A. Kimball, R.L. Runkel, K. Walton-Day, B.K. Stover
2006, Scientific Investigations Report 2004-5143
Decisions about remediation of mine drainage on the watershed scale require an understanding of metal contributions from all sources to be able to choose the best sites for remediation. A hydrologic framework to study metal loading in the Willow Creek watershed, a tributary to the Rio Grande River, was established...
