Relative importance of magnetic moments in UXO clearance applications
V. Sanchez, Y. Li, M. Nabighian, D. Wright
2006, SEG Technical Program Expanded Abstracts (25) 1381-1385
Surface magnetic anomaly observed in UXO clearance is mainly dipolar and, as a result, the dipole is the only moment used regularly in UXO applications. The dipole moment contains intensity of magnetization information but lacks shape information. Unlike dipole, higher-order moments, such as quadrupole and octupole, encode asymmetry properties of...
Time-lapse seismic study of levees in southern New Mexico
J. Ivanov, R. D. Miller, N. Stimac, R.F. Ballard Jr., J. Joseph Dunbar, S. Steve Smullen
2006, SEG Technical Program Expanded Abstracts (25) 3255-3259
The primary objective of this work was to measure changes in compressional- (Vp) and shear-wave (Vs) velocities in an earthen levee during a ponding experiment designed to simulate flood conditions on the Rio Grande in south New Mexico. Although similar to such experiment, performed an year earlier on the Rio...
Interactive effects of substrate, hydroperiod, and nutrients on seedling growth of Salix nigra and Taxodium distichum
Richard H. Day, T.W. Doyle, R. O. Draugelis-Dale
2006, Environmental and Experimental Botany (55) 163-174
The large river swamps of Louisiana have complex topography and hydrology, characterized by black willow (Salix nigra) dominance on accreting alluvial sediments and vast areas of baldcypress (Taxodium distichum) deepwater swamps with highly organic substrates. Seedling survival of these two wetland tree species is influenced by their growth rate in...
Hierarchical models for avian ecologists
W. B. Kristan III, J. M. Scott
2006, Conference Paper, Condor
[No abstract available]...
Mapping stream habitats with a global positioning system: Accuracy, precision, and comparison with traditional methods
D.C. Dauwalter, W.L. Fisher, K.C. Belt
2006, Environmental Management (37) 271-280
We tested the precision and accuracy of the Trimble GeoXT??? global positioning system (GPS) handheld receiver on point and area features and compared estimates of stream habitat dimensions (e.g., lengths and areas of riffles and pools) that were made in three different Oklahoma streams using the GPS receiver and a...
Crustal contamination and crystal entrapment during polybaric magma evolution at Mt. Somma-Vesuvius volcano, Italy: Geochemical and Sr isotope evidence
M. Piochi, R. A. Ayuso, B. de Vivo, R. Somma
2006, LITHOS (86) 303-329
New major and trace element analyses and Sr-isotope determinations of rocks from Mt. Somma-Vesuvius volcano produced from 25 ky BP to 1944 AD are part of an extensive database documenting the geochemical evolution of this classic region. Volcanic rocks include silica undersaturated, potassic and ultrapotassic lavas and tephras characterized by...
Predictable hotspots and foraging habitat of the endangered short-tailed albatross (Phoebastria albatrus) in the North Pacific: Implications for conservation
John F. Piatt, J. Wetzel, K. Bell, A.R. DeGange, G.R. Balogh, G.S. Drew, T. Geernaert, C. Ladd, G.V. Byrd
2006, Deep-Sea Research Part II: Topical Studies in Oceanography (53) 387-398
The short-tailed albatross (Phoebastria albatrus) is a rare and endangered seabird that ranges widely over the northern North Pacific. Populations are slowly recovering but birds face several threats at sea, in particular the incidental capture of birds in long-line fisheries. Conservation efforts are hampered by a lack of information about...
Diurnal variation in rates of calcification and carbonate sediment dissolution in Florida Bay
K. K. Yates, R. B. Halley
2006, Estuaries and Coasts (29) 24-39
Water quality and criculation in Florida Bay (a shallow, subtropical estuary in south Florida) are highly dependent upon the development and evolution of carbonate mud banks distributed throughout the Bay. Predicting the effect of natural and anthropogenic perturbations on carbonate sedimentation requires an understanding of annual,...
Ponderosa pine snag densities following multiple fires in the Gila Wilderness, New Mexico
Z.A. Holden, P. Morgan, M.G. Rollins, R.G. Wright
2006, Forest Ecology and Management (221) 140-146
Fires create and consume snags (standing dead trees), an important structural and ecological component of ponderosa pine forests. The effects of repeated fires on snag densities in ponderosa pine forests of the southwestern USA have not been studied. Line intercept sampling was used to estimate snag densities in areas of...
The effect of creosote on vitellogenin production in rainbow trout (Oncorhynchus mykiss)
J.P. Sherry, J.J. Whyte, N.A. Karrow, A. Gamble, H.J. Boerman, N.C. Bol, D.G. Dixon, K.R. Solomon
2006, Archives of Environmental Contamination and Toxicology (50) 65-68
As part of a broader investigation into the effects of creosote treatments on the aquatic biota in pond microcosms, we examined the possible implications for vitellogenin (Vtg) production in Oncorhynchus mykiss [rainbow trout (RT)]. Vtg is the precursor of egg yolk protein and has emerged as a useful biomarker of...
Greater sage-grouse as an umbrella species for sagebrush-associated vertebrates
M.M. Rowland, M.J. Wisdom, L.H. Suring, C.W. Meinke
2006, Biological Conservation (129) 323-335
Widespread degradation of the sagebrush ecosystem in the western United States, including the invasion of cheatgrass, has prompted resource managers to consider a variety of approaches to restore and conserve habitats for sagebrush-associated species. One such approach involves the use of greater sage-grouse, a species of prominent conservation interest, as...
Midwestern streamflow, precipitation, and atmospheric vorticity influenced by Pacific sea-surface temperatures and total solar-irradiance variations
C. A. Perry
2006, International Journal of Climatology (26) 207-218
A solar effect on streamflow in the Midwestern United States is described and supported in a six-step physical connection between total solar irradiance (TSI), tropical sea-surface temperatures (SSTs), extratropical SSTs, jet-stream vorticity, surface-layer vorticity, precipitation, and streamflow. Variations in the correlations among the individual steps indicate that the solar/hydroclimatic mechanism...
Stable carbon isotope depth profiles and soil organic carbon dynamics in the lower Mississippi Basin
J.G. Wynn, J.W. Harden, T. L. Fries
2006, Geoderma (131) 89-109
Analysis of depth trends of 13C abundance in soil organic matter and of 13C abundance from soil-respired CO2 provides useful indications of the dynamics of the terrestrial carbon cycle and of paleoecological change. We measured depth trends of 13C abundance from cropland and control pairs of soils in the lower...
Crustal structure across the Altyn Tagh Range at the northern margin of the Tibetan Plateau and tectonic implications
J. Zhao, Walter D. Mooney, X. Zhang, Z. Li, Z. Jin, N. Okaya
2006, Earth and Planetary Science Letters (241) 804-814
We present new seismic refraction/wide-angle-reflection data across the Altyn Tagh Range and its adjacent basins. We find that the crustal velocity structure, and by inference, the composition of the crust changes abruptly beneath the Cherchen fault, i.e., ∼100 km north of the northern...
A variance-decomposition approach to investigating multiscale habitat associations
J.J. Lawler, T.C. Edwards Jr.
2006, Conference Paper, Condor
The recognition of the importance of spatial scale in ecology has led many researchers to take multiscale approaches to studying habitat associations. However, few of the studies that investigate habitat associations at multiple spatial scales have considered the potential effects of cross-scale correlations in measured habitat variables. When cross-scale correlations...
Characterization and petrologic interpretation of olivine-rich basalts at Gusev Crater, Mars
H.Y. McSween, M.B. Wyatt, Ralf Gellert, J.F. Bell, R.V. Morris, Kenneth E. Herkenhoff, L.S. Crumpler, K.A. Milam, K.R. Stockstill, L.L. Tornabene, R. E. Arvidson, P. Bartlett, D. Blaney, N.A. Cabrol, P. R. Christensen, B. C. Clark, J.A. Crisp, D.J. Des Marais, T. Economou, J.D. Farmer, W. Farrand, A. Ghosh, M. Golombek, S. Gorevan, R. Greeley, V.E. Hamilton, J. R. Johnson, B.L. Joliff, G. Klingelhofer, A.T. Knudson, S. McLennan, D. Ming, J.E. Moersch, R. Rieder, S. W. Ruff, C. Schroder, P.A. de Souza, S. W. Squyres, H. Wanke, A. Wang, A. Yen, J. Zipfel
2006, Journal of Geophysical Research E: Planets (111)
Rocks on the floor of Gusev crater are basalts of uniform composition and mineralogy. Olivine, the only mineral to have been identified or inferred from data by all instruments on the Spirit rover, is especially abundant in these rocks. These picritic basalts are similar in many respects to certain Martian...
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...
Provenance, age, and environment of mid-Wisconsinan slackwater lake sediment in the St. Louis Metro East area, USA
B. Brandon Curry, D.A. Grimley
2006, Quaternary Research (65) 108-122
Valleys tributary to the Mississippi River contain fossiliferous slackwater lake sediment (Equality Formation) deposited in response to aggradation of the Mississippi River valley during the last glaciation. In the St. Louis Metro East area, the lower part of the Equality Formation is primarily laminated, fossiliferous silt and clay deposited from...
Influence of beaver activity on summer growth and condition of age-2 Atlantic salmon parr
Douglas B. Sigourney, B. H. Letcher, R.A. Cunjak
2006, Transactions of the American Fisheries Society (135) 1068-1075
The activity of beavers Castor canadensis in freshwater environments can have considerable localized impacts on the physical and biological components of riparian ecosystems. By changing the habitat of a stream, beaver dams can cause spatial variation in growth opportunity that may have direct consequences for the growth of resident fish....
Cassini observations of flow-like features in western Tui Regio, Titan
J. W. Barnes, R. H. Brown, J. Radebaugh, B. J. Buratti, Christophe Sotin, Stéphane Le Mouélic, S. Rodriguez, E. P. Turtle, J. Perry, R. Clark, K. H. Baines, P. D. Nicholson
2006, Geophysical Research Letters (33)
A large (>3 ?? 104 km2), lobate, 5-??m-bright region seen by Cassini on Titan's leading equatorial region is best explained as a flow field. We discuss observations from the Visual and Infrared Mapping Spectrometer and Imaging Science Subsystem of the feature and present a map of the field. We establish...
A preliminary environmental site investigation for a bridge over the Mississippi River at Moline, Illinois
C.B. Trask
Calabrese E.J.Kostecki P.T.Dragun J., editor(s)
2006, Conference Paper, Contaminated Soils, Sediments and Water: Success and Challenges
The Illinois State Geological Survey completed a preliminary environmental site assessment along the alignment of Interstate 74 (I-74) and its bridge over the Mississippi River for the Illinois Department of Transportation (IDOT) in 2002. The objective of the study was to determine if any of the parcels proposed for acquisition...
Comparison of circulation times of thermal waters discharging from the Idaho batholith based on geothermometer temperatures, helium concentrations, and 14C measurements
Robert H. Mariner, William C. Evans, H.W. Young
2006, Geothermics (35) 3-25
Circulation times of waters in geothermal systems are poorly known. In this study, we examine the thermal waters of the Idaho batholith to verify whether maximum system temperatures, helium concentrations, and 14C values are related to water age in these low-to-moderate temperature geothermal systems. He/N2 values of gas collected from...
Rayleigh-wave diffractions due to a void in the layered half space
J. Xia, Y. Xu, R. D. Miller, Jonathan E. Nyquist
2006, SEG Technical Program Expanded Abstracts (25) 1406-1410
Void detection is challenging due to the complexity of near-surface materials and the limited resolution of geophysical methods. Although multichannel, high-frequency, surface-wave techniques can provide reliable shear (S)-wave velocities in different geological settings, they are not suitable for detecting voids directly based on anomalies of the S-wave velocity because of...
A new species of freshwater mussel (Bivalvia: Unionidae), Pleurobema athearni, from the Coosa River Drainage of Alabama, USA
M.M. Gangloff, J.D. Williams, J.W. Feminella
2006, Zootaxa 43-56
The Mobile Basin historically supported one of the most diverse freshwater mussel (Bivalvia: Unionidae) assemblages in North America. More than 65 species of mussels are known from the Basin, but it is difficult to determine how many species were present historically. The drainage's unique physical habitat was largely destroyed between...
Abundance trends and status of the Little Colorado River population of humpback chub
L.G. Coggins Jr., William E. Pine III, C.J. Walters, D. R. Van Haverbeke, David Ward, H.C. Johnstone
2006, North American Journal of Fisheries Management (26) 233-245
The abundance of the Little Colorado River population of federally listed humpback chub Gila cypha in Grand Canyon has been monitored since the late 1980s by means of catch rate indices and capture-recapture-based abundance estimators. Analyses of data from all sources using various methods are consistent and indicate that the...
