Biotic soil crusts in relation to topography, cheatgrass, and fire in the Columbia Basin, Washington
Jeanne Ponzetti, B. McCune, David A. Pyke
2007, Bryologist (110) 706-722
We studied lichen and bryophyte soil crust communities in a large public grazing allotment within a sagebrush steppe ecosystem in which the biotic soil crusts are largely intact. The allotment had been rested from grazing for 12 years, but experienced an extensive series of wildfires. In the 350, 4 x...
Mapping impervious surfaces using classification and regression tree algorithm
G. Xian
Q. Weng, editor(s)
2007, Book chapter, Remote sensing of impervious surfaces
No abstract available....
Sea level fluctuations in central California at subtidal to decadal and longer time scales with implications for San Francisco Bay, California
H. F. Ryan, M.A. Noble
2007, Estuarine, Coastal and Shelf Science (73) 538-550
Sea level elevations from near the mouth of San Francisco Bay are used to describe the low-frequency variability of forcing of the coastal ocean on the Bay at a variety of temporal scales. About 90% of subtidal fluctuations in sea level...
Dynamic in-lake spawning migrations by female sockeye salmon
Daniel Young, C.A. Woody
2007, Ecology of Freshwater Fish (16) 155-164
Precise homing by salmon to natal habitats is considered the primary mechanism in the evolution of population-specific traits, yet few studies have focused on this final phase of their spawning migration. We radio tagged 157 female sockeye salmon (Oncorhynchus nerka) as they entered Lake Clark, Alaska, and tracked them every...
Aerial population estimates of wild horses (Equus caballus) in the adobe town and salt wells creek herd management areas using an integrated simultaneous double-count and sightability bias correction technique
Bruce C. Lubow, Jason I. Ransom
2007, Open-File Report 2007-1274
An aerial survey technique combining simultaneous double-count and sightability bias correction methodologies was used to estimate the population of wild horses inhabiting Adobe Town and Salt Wells Creek Herd Management Areas, Wyoming. Based on 5 surveys over 4 years, we conclude that the technique produced estimates consistent with the known...
Multiple-methods investigation of recharge at a humid-region fractured rock site, Pennsylvania, USA
C.S. Heppner, J. R. Nimmo, G.J. Folmar, W.J. Gburek, D. W. Risser
2007, Hydrogeology Journal (15) 915-927
Lysimeter-percolate and well-hydrograph analyses were combined to evaluate recharge for the Masser Recharge Site (central Pennsylvania, USA). In humid regions, aquifer recharge through an unconfined low-porosity fractured-rock aquifer can cause large magnitude water-table fluctuations over short time scales. The unsaturated hydraulic characteristics of the subsurface porous...
The influence of extractable organic matter on vitrinite reflectance suppression: A survey of kerogen and coal types
C.E. Barker, M. D. Lewan, M. J. Pawlewicz
2007, International Journal of Coal Geology (70) 67-78
The vitrinite reflectance suppression literature shows that while bitumen impregnation of the vitrinite group is often invoked as a significant contributor to suppression, its existence is not often supported by petrological evidence. This study examines bitumen impregnation as a factor in vitrinite suppression by comparing the vitrinite reflectance of source...
Arsenic attenuation by oxidized aquifer sediments in Bangladesh
Kenneth G. Stollenwerk, George N. Breit, Alan H. Welch, James C. Yount, John W. Whitney, Andrea L. Foster, M.N. Uddin, R.K. Majumder, N. Ahmed
2007, Science of the Total Environment (379) 133-150
Recognition of arsenic (As) contamination of shallow fluvio-deltaic aquifers in the Bengal Basin has resulted in increasing exploitation of groundwater from deeper aquifers that generally contain low concentrations of dissolved As. Pumping-induced infiltration of high-As groundwater could eventually cause As concentrations in these aquifers to increase. This study investigates the...
Formation of mixed Al-Fe colloidal sorbent and dissolved-colloidal partitioning of Cu and Zn in the Cement Creek - Animas River Confluence, Silverton, Colorado
Laurence E. Schemel, Briant A. Kimball, Robert L. Runkel, Marisa H. Cox
2007, Applied Geochemistry (22) 1467-1484
Transport and chemical transformations of dissolved and colloidal Al, Fe, Cu and Zn were studied by detailed sampling in the mixing zone downstream from the confluence of Cement Creek (pH 4.1) with the Animas River (pH 7.6). Complete mixing resulted in...
Quantitative remote sensing study indicates doubling of coastal erosion rate in past 50 yr along a segment of the Arctic coast of Alaska
J.C. Mars, D.W. Houseknecht
2007, Geology (35) 583-586
A new quantitative coastal land gained-and-lost method uses image analysis of topographic maps and Landsat thematic mapper short-wave infrared data to document accelerated coastal land loss and thermokarst lake expansion and drainage. The data span 1955-2005 along the Beaufort Sea coast north of Teshekpuk Lake in the National Petroleum Reserve...
Introduced species and abiotic factors affect longitudinal variation in small fish assemblages in the Wind River watershed, Wyoming
P.S. Lionberger, W.A. Hubert
2007, Journal of Freshwater Ecology (22) 287-295
We assessed longitudinal variation in small fish assemblages in the Wind River watershed upstream from Boysen Reservoir, Wyoming and into the reservoir. Twenty-six species were found in the study area, and 12 of the species were believed to have been introduced since settlement by Europeans. Additions and losses of fish...
A record of large earthquakes on the southern Hayward fault for the past 1800 years
J. J. Lienkaemper, P. L. Williams
2007, Bulletin of the Seismological Society of America (97) 1803-1819
This is the second article presenting evidence of the occurrence and timing of paleoearthquakes on the southern Hayward fault as interpreted from trenches excavated within a sag pond at the Tyson's Lagoon site in Fremont, California. We use the information to estimate the mean value and aperiodicity of the fault's...
Reappearance of deepwater sculpin in Lake Ontario: Resurgence or last gasp of a doomed population?
B.F. Lantry, R. O'Gorman, M. G. Walsh, J.M. Casselman, J.A. Hoyle, M.J. Keir, J.R. Lantry
2007, Journal of Great Lakes Research (33) 34-45
Deepwater sculpin (Myoxocephalus thompsonii) were abundant in Lake Ontario in the 1920s and at least common into the 1940s. By the 1960s they were rare and, thereafter, some considered the population extirpated even though a synoptic survey of the lake in 1972 produced three, relatively large (148–165 mm total length,...
Duration of a large Mafic intrusion and heat transfer in the lower crust: A SHRIMP U-Pb zircon Study in the Ivrea-Verbano Zone (Western Alps, Italy)
G. Peressini, J. E. Quick, S. Sinigoi, A.W. Hofmann, M. Fanning
2007, Journal of Petrology (48) 1185-1218
The Ivrea-Verbano Zone in the western Italian Alps contains one of the world's classic examples of ponding of mantle-derived, mafic magma in the deep crust. Within it, a voluminous, composite mafic pluton, the Mafic Complex, intruded lower-crustal, high-grade paragneiss of the Kinzigite Formation during Permian-Carboniferous time, and is now exposed...
Restoration of wildcelery, Vallisneria americana Michx., in the lower Detroit River of the Lake Huron-Lake Erie Corridor
D. W. Schloesser, B.A. Manny
2007, Journal of Great Lakes Research (33) 8-19
American wildcelery (Vallisneria americana Michx.) is a valuable submersed aquatic plant that was negatively affected by pollution and urban runoff in the lower Detroit River for much of the 20th century. Following 25 years of water-pollution and urban-runoff abatement initiated in the early 1970s, we postulated that water clarity had...
Authigenic carbonate formation at hydrocarbon seeps in continental margin sediments: A comparative study
T.H. Naehr, P. Eichhubl, V.J. Orphan, M. Hovland, C. K. Paull, W. Ussler III, T.D. Lorenson, H. Gary Greene
2007, Deep-Sea Research Part II: Topical Studies in Oceanography (54) 1268-1291
Authigenic carbonates from five continental margin locations, the Eel River Basin, Monterey Bay, Santa Barbara Basin, the Sea of Okhotsk, and the North Sea, exhibit a wide range of mineralogical and stable isotopic compositions. These precipitates include aragonite, low- and high-Mg calcite, and dolomite. The carbon isotopic composition of carbonates...
Geology and geochronology of the Spirit Mountain batholith, southern Nevada: Implications for timescales and physical processes of batholith construction
B.A. Walker Jr., C. F. Miller, Claiborne L. Lowery, J. L. Wooden, J.S. Miller
2007, Journal of Volcanology and Geothermal Research (167) 239-262
The Spirit Mountain batholith (SMB) is a ∼ 250 km2 composite silicic intrusion located within the Colorado River Extensional Corridor in southernmost Nevada. Westward tilting of 40–50° has exposed a cross-section from the roof through deep levels of the batholith. Piecemeal construction is indicated by zircon geochronology, field relations, and...
Crustal controls on magmatic-hydrothermal systems: A geophysical comparison of White River, Washington, with Goldfield, Nevada
R.J. Blakely, D. A. John, S. E. Box, B. R. Berger, R.J. Fleck, R. P. Ashley, G.R. Newport, G.R. Heinemeyer
2007, Geosphere (3) 91-107
The White River altered area, Washington, and the Goldfield mining district, Nevada, are nearly contemporaneous Tertiary (ca. 20 Ma) calc-alkaline igneous centers with large exposures of shallow (<1 km depth) magmatic-hydrothermal, acid-sulfate alteration. Goldfield is the largest known high-sulfidation gold deposit in North...
A comparison of macroinvertebrate and habitat methods of data collection in the Little Colorado River Watershed, Arizona 2007
Patrice Spindler, Nick V. Paretti
2007, Open-File Report 10-05
The Arizona Department of Environmental Quality (ADEQ) and the U.S. Environmental Protection Agency (USEPA) Ecological Monitoring and Assessment Program (EMAP), use different field methods for collecting macroinvertebrate samples and habitat data for bioassessment purposes. Arizona’s Biocriteria index was developed using a riffle habitat sampling methodology, whereas the EMAP method employs...
Breeding bird territory placement in riparian wet meadows in relation to invasive reed canary grass, Phalaris arundinacea
E.M. Kirsch, B. R. Gray, T.J. Fox, W.E. Thogmartin
2007, Wetlands (27) 644-655
Invasive plants are a growing concern worldwide for conservation of native habitats. In endangered wet meadow habitat in the Upper Midwestern United States, reed canary grass (Phalaris arundinacea) is a recognized problem and its prevalence is more widespread than the better-known invasive wetland plant purple loosestrife (Lythrum salicaria). Although resource...
Field evaluation of shallow-water acoustic doppler current profiler discharge measurements
M.S. Rehmel
2007, Conference Paper, Examining the Confluence of Environmental and Water Concerns - Proceedings of the World Environmental and Water Resources Congress 2006
In 2004, the U.S. Geological Survey (USGS) Office of Surface Water staff and USGS Water Science employees began testing the StreamPro, an acoustic Doppler current profiler (ADCP) for shallow-water discharge measurements. Teledyne RD Instruments introduced the StreamPro in December of 2003. The StreamPro is designed to make a "moving boat"...
Online catalog of world-wide test sites for the post-launch characterization and calibration of optical sensors
G. Chander, J.B. Christopherson, G. L. Stensaas, P.M. Teillet
2007, Conference Paper, International Astronautical Federation - 58th International Astronautical Congress 2007
In an era when the number of Earth-observing satellites is rapidly growing and measurements from these sensors are used to answer increasingly urgent global issues, it is imperative that scientists and decision-makers rely on the accuracy of Earth-observing data products. The characterization and calibration of these sensors are vital to...
Trends in the occurrence of MTBE in drinking water in the Northeast United States
M.J. Moran
2007, Conference Paper, Ground Water Management - Petroleum Hydrocarbons and Organic Chemicals in Ground Water: Prevention, Assessment, and Remediation Conf
Public water systems in Connecticut, Maine, Maryland, New Hampshire, New Jersey, and Rhode Island sampled treated drinking water from 1993-2006 and analyzed the samples for MTBE. The US Geological Survey examined trends in the occurrence of MTBE in drinking water derived from ground water in these States for two near-decadal...
Investigating passage of ESA-listed juvenile fall Chinook salmon at Lower Granite Dam during winter when the fish bypass system is not operated. Annual report 2006
T.J. Kock, K.F. Tiffan, W.P. Connor
2007, Report
n/a...
Selected chemical composition of deposited sediments in the flooded areas of New Orleans following Hurricane Katrina
Emitt C. Witt III, Craig Adams, Jianmin Wang, David K. Shaver, Youssef Filali-Meknassi
2007, Circular 1306-7B
Nearly 4 weeks after Hurricane Katrina passed through St. Bernard Parish, the U.S. Geological Survey's (USGS) Mid-Continent Geographic Science Center and the University of Missouri-Rolla's (UMR) Natural Hazard Mitigation Institute deployed a team of scientists to the region to collect perishable environmental and engineering data. The team collected 149 samples...
