Major and Trace-Element Data from Stream-Sediment and Rock Samples Collected in the Taylor Mountains 1:250,000-Scale Quadrangle, Alaska
Elizabeth A. Bailey, Gregory K. Lee, Seth H. Mueller, Bronwen Wang, Zoe Ann Brown, Greg A. Beischer
2007, Open-File Report 2007-1196
In the summers of 2004, 2005, and 2006, the U.S. Geological Survey conducted a reconnaissance geochemical survey of the drainage basins throughout most of the Taylor Mountains 1:250,000-scale quadrangle, in southwestern Alaska. The purpose of the study was to locate areas of potential interest for ore minerals, provide data that...
Estimating the amount of eroded section in a partially exhumed basin from geophysical well logs: An example from the North Slope
W. Matthew Burns, Daniel O. Hayba, Elisabeth L. Rowan, David W. Houseknecht
2007, Professional Paper 1732-D
The reconstruction of burial and thermal histories of partially exhumed basins requires an estimation of the amount of erosion that has occurred since the time of maximum burial. We have developed a method for estimating eroded thickness by using porosity-depth trends derived from borehole sonic logs of wells in the...
Hydrology and Flood Profiles of Duck Creek and Jordan Creek Downstream from Egan Drive, Juneau, Alaska
Janet H. Curran
2007, Scientific Investigations Report 2006-5323
Hydrologic and hydraulic updates for Duck Creek and the lower part of Jordan Creek in Juneau, Alaska, included computation of new estimates of peak streamflow magnitudes and new water-surface profiles for the 10-, 50-, 100-, and 500-year floods. Computations for the 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year...
Contaminated salmon and the public's trust
Samuel N. Luoma, Ragnar E. Lofstedt
2007, Environmental Science & Technology (41) 1811-1814
Scientific uncertainties often make it difficult for environmental policy makers to determine how to communicate risks to the public. A constructive, holistic, multisectoral dialogue about an issue can improve understanding of uncertainties from different perspectives and clarify options for risk communication. Many environmental issues could benefit from explicit promotion of...
Seasonal variation in nutrient retention during inundation of a short-hydroperiod floodplain
G.B. Noe, C.R. Hupp
2007, River Research and Applications (23) 1088-1101
Floodplains are generally considered to be important locations for nutrient retention or inorganic-to-organic nutrient conversions in riverine ecosystems. However, little is known about nutrient processing in short-hydroperiod floodplains or seasonal variation in floodplain nutrient retention. Therefore, we quantified the net uptake, release or transformation of nitrogen (N), phosphorus (P) and...
Chronic Wasting Disease
Bryan Richards
2007, Fact Sheet 2007-3070
Chronic wasting disease (CWD) is an always-fatal, neurological illness occurring in North American cervids (members of the deer family), including white-tailed deer, mule deer, elk and moose. Since its discovery in 1967, CWD has spread geographically and increased in prevalence locally. CWD is contagious; it can be transmitted freely within...
Toward a transport-based analysis of nutrient spiraling and uptake in streams
Robert L. Runkel
2007, Limnology and Oceanography: Methods (5) 50-62
Nutrient addition experiments are designed to study the cycling of nutrients in stream ecosystems where hydrologic and nonhydrologic processes determine nutrient fate. Because of the importance of hydrologic processes in stream ecosystems, a conceptual model known as nutrient spiraling is frequently employed. A central part of the nutrient spiraling approach...
Oregon Spotted Frog (Rana pretiosa) movement and demography at Dilman Meadow: Implications for future monitoring
Nathan D. Chelgren, Christopher A. Pearl, Jay Bowerman, M. J. Adams
2007, Open-File Report 2007-1016
From 2001 to 2005, we studied the demography and seasonal movement of Oregon spotted frogs (Rana pretiosa) translocated into created ponds in Dilman Meadow in central Oregon. Our objectives were to inform future monitoring and management at the site, and to elucidate poorly known aspects of the species’ population ecology....
Steeply dipping heaving bedrock, Colorado: Part 1 - Heave features and physical geological framework
D.C. Noe, J.D. Higgins, H. W. Olsen
2007, Environmental & Engineering Geoscience (13) 289-308
Differentially heaving bedrock has caused severe damage near the Denver metropolitan area. This paper describes heave-feature morphologies, the underlying bedrock framework, and their inter-relationship. The heave features are linear to curvilinear and may attain heights of 0.7 m (2.4 ft), widths of 58 m (190 ft), and lengths of 1,067...
Influence of fluctuating water levels on mercury concentrations in adult walleye
T.M. Selch, C.W. Hoagstrom, E.J. Weimer, J.P. Duehr, S. R. Chipps
2007, Bulletin of Environmental Contamination and Toxicology (79) 36-40
[No abstract available]...
Hydrographic characterization of two tidal creeks with implications for watershed land use, flushing times, and benthic production
C. Buzzelli, Austin F. Holland, D.M. Sanger, P.C. Conrads
2007, Estuaries and Coasts (30) 321-330
Many coastal ecosystems are undergoing anthropogenic stress from large increases in population and urbanization. In many regions changes in freshwater and material inputs to the coastal zone are altering the biogeochemical and biological capacities of ecosystems. Despite increased watershed inputs, large tidal volumes and flushing indicative of macrotidal estuaries can...
Assessment of contamination from arsenical pesticide use on orchards in the great valley region, Virginia and West Virginia, USA
Gilpin R. Robinson Jr., Peter Larkins, Carol J. Boughton, Bradley W. Reed, Philip L. Sibrell
2007, Journal of Environmental Quality (36) 654-663
Lead arsenate pesticides were widely used in apple orchards from 1925 to 1955. Soils from historic orchards in four counties in Virginia and West Virginia contained elevated concentrations of As and Pb, consistent with an arsenical pesticide source. Arsenic concentrations in approximately 50% of the orchard site soils and approximately...
Porphyry Cu-Au and associated polymetallic Fe-Cu-Au deposits in the Beiya Area, western Yunnan Province, south China
X.-W. Xu, X.-P. Cai, Q.-B. Xiao, S. G. Peters
2007, Ore Geology Reviews (31) 224-246
The Alkaline porphyries in the Beiya area are located east of the Jinshajiang suture, as part of a Cenozoic alkali-rich porphyry belt in western Yunnan. The main rock types include quartz-albite porphyry, quartz-K-feldspar porphyry and biotite-K-feldspar porphyry. These porphyries are characterised by high alkalinity [(K2O + Na2O)% > 10%], high...
Forward model nonlinearity versus inverse model nonlinearity
S. Mehl
2007, Ground Water (45) 791-794
The issue of concern is the impact of forward model nonlinearity on the nonlinearity of the inverse model. The question posed is, "Does increased nonlinearity in the head solution (forward model) always result in increased nonlinearity in the inverse solution (estimation of hydraulic conductivity)?" It is shown that the two...
Enhancing water cycle measurements for future hydrologic research
H.W. Loescher, J.M. Jacobs, O. Wendroth, D.A. Robinson, G.S. Poulos, K. McGuire, P. Reed, B.P. Mohanty, J. B. Shanley, W. Krajewski
2007, Bulletin of the American Meteorological Society (88) 669-676
The Consortium of Universities for the Advancement of Hydrologic Sciences, Inc., established the Hydrologic Measurement Facility to transform watershed-scale hydrologic research by facilitating access to advanced instrumentation and expertise that would not otherwise be available to individual investigators. We outline a committee-based process that determined which suites of instrumentation best...
Differentiating the Bishop ash bed and related tephra layers by elemental-based similarity coefficients of volcanic glass shards using solution inductively coupled plasma-mass spectrometry (S-ICP-MS)
J.R. Knott, A.M. Sarna-Wojcicki, I.P. Montanez, E. Wan
2007, Quaternary International (166) 79-86
Volcanic glass samples from the same volcanic center (intra-source) often have a similar major-element composition. Thus, it can be difficult to distinguish between individual tephra layers, particularly when using similarity coefficients calculated from electron microprobe major-element measurements. Minor/trace element concentrations in glass...
East asian gold: Deciphering the anomaly of phanerozoic gold in precambrian cratons
R.J. Goldfarb, C. Hart, G. Davis, D. Groves
2007, Economic Geology (102) 341-345
Early Cretaceous orogenic gold deposits in eastern Asia are globally unique in that large Phanerozoic lode gold deposits occur in Archean-Paleoproterozoic cratons. In the northern Pacific region, ca. 125 Ma orogenic gold deposits in the North China, Yangzte, and Siberian craton margins, as well as in young terranes in California,...
Responses of prairie arthropod communities to fire and fertilizer: Balancing plant and arthropod conservation
M.K. Hartley, W.E. Rogers, E. Siemann, J. Grace
2007, American Midland Naturalist (157) 92-105
Fire is an important tool for limiting woody plant invasions into prairies, but using fire management to maintain grassland plant communities may inadvertently reduce arthropod diversity. To test this, we established twenty-four 100 m2 plots in a tallgrass prairie in Galveston County, Texas, in spring 2000. Plots were assigned a...
Habitat characteristics of adult frosted elfins (Callophrys irus) in sandplain communities of southeastern Massachusetts, USA
G. Albanese, P.D. Vickery, P.R. Sievert
2007, Biological Conservation (136) 53-64
Changes to land use and disturbance frequency threaten disturbance-dependent Lepidoptera within sandplain habitats of the northeastern United States. The frosted elfin (Callophrys irus) is a rare and declining monophagous butterfly that is found in xeric open habitats maintained by disturbance. We surveyed potential habitat for adult frosted elfins at four...
Power to detect trend in short-term time series of bird abundance
W.E. Thogmartin, B. R. Gray, M. Gallagher, N. Young, J.J. Rohweder, M. G. Knutson
2007, Condor (109) 943-948
Avian point counts for population monitoring are often collected over a short timespan (e.g., 3-5 years). We examined whether power was adequate (power ???0.80) in short-duration studies to warrant the calculation of trend estimates. We modeled power to detect trends in abundance indices of eight bird species occurring across three...
Investigators share improved understanding of the North American carbon cycle
R.A. Birdsey, R. Cook, S. Denning, P. Griffith, B. Law, J. Masek, A. Michalak, S. Ogle, D. Ojima, Y. Pan, C. Sabine, E. Sheffner, E. Sundquist
2007, Conference Paper, Eos
[No abstract available]...
The geology of the Morro Velho gold deposit in the Archean Rio das Velhas greenstone belt, Quadrilátero Ferrífero, Brazil
Diogenes Scipioni Vial, Ed DeWitt, Lydia Maria Lobato, Charles H. Thorman
2007, Ore Geology Reviews (32) 511-542
The Morro Velho gold deposit, Quadrilátero Ferrífero region, Minas Gerais, Brazil, is hosted by rocks at the base of the Archean Rio das Velhas greenstone belt. The deposit occurs within a thick carbonaceous phyllite package, containing intercalations of felsic and intermediate volcaniclastic rocks and dolomites. Considering the temporal and spatial...
Factors to consider for trace element deposition biomonitoring surveys with lichen transplants
S. Ayrault, R. Clochiatti, F. Carrot, L. Daudin, J. P. Bennett
2007, Science of the Total Environment (372) 717-727
A trace element deposition biomonitoring experiment with transplants of the fruticose lichen Evernia prunastri was developed, aimed at monitoring the effects of different exposure parameters (exposure orientation and direct rain) and to the elements Ti, V, Cr, Co, Cu, Zn, Rb, Cd, Sb and Pb. Accumulations were observed for most...
Effect of bedrock permeability on subsurface stormflow and the water balance of a trenched hillslope at the Panola Mountain Research Watershed, Georgia, USA
Meerveld H. J. Tromp-van H. J., N.E. Peters, Jeffery J. McDonnell
2007, Hydrological Processes (21) 750-769
The effect of bedrock permeability on subsurface stormflow initiation and the hillslope water balance is poorly understood. Previous hillslope hydrological studies at the Panola Mountain Research Watershed (PMRW), Georgia, USA, have assumed that the bedrock underlying the trenched hillslope is effectively impermeable. This paper presents a series of sprinkling experiments...
Developing a flood monitoring system from remotely sensed data for the Limpopo basin
K.O. Asante, R.D. Macuacua, G. A. Artan, R.W. Lietzow, J. P. Verdin
2007, IEEE Transactions on Geoscience and Remote Sensing (45) 1709-1714
This paper describes the application of remotely sensed precipitation to the monitoring of floods in a region that regularly experiences extreme precipitation and flood events, often associated with cyclonic systems. Precipitation data, which are derived from spaceborne radar aboard the National Aeronautics and Space Administration's Tropical Rainfall Measuring Mission and...
