Surface complexation modeling of U(VI) adsorption by aquifer sediments from a former mill tailings site at Rifle, Colorado
S.P. Hyun, P.M. Fox, J.A. Davis, K.M. Campbell, K.F. Hayes, P.E. Long
2009, Environmental Science & Technology (43) 9368-9373
A study of U(VI) adsorption by aquifer sediment samples from a former uranium mill tailings site at Rifle, Colorado, was conducted under oxic conditions as a function of pH, U(VI), Ca, and dissolved carbonate concentration. Batch adsorption experiments were performed using <2mm size sediment fractions, a sand-sized fraction, and artificial...
Web-based decision support and visualization tools for water quality management in the Chesapeake Bay watershed
C. Mullinix, P. Hearn, H. Zhang, J. Aguinaldo
2009, Conference Paper, 2009 17th International Conference on Geoinformatics, Geoinformatics 2009
Federal, State, and local water quality managers charged with restoring the Chesapeake Bay ecosystem require tools to maximize the impact of their limited resources. To address this need, the U.S. Geological Survey (USGS) and the Environmental Protection Agency's Chesapeake Bay Program (CBP) are developing a suite of Web-based tools called...
How useful are the "other" semipermeable membrane devices (SPMDs); the mini-unit (15.2 cm long)?
Steven L. Goodbred, Wade L. Bryant Jr., Michael R. Rosen, David Alvarez, Terri Spencer
2009, Science of the Total Environment (407) 4149-4156
Mini (15.2 cm) semipermeable membrane devices (SPMDs) were used successfully in 169 streams from six metropolitan areas of the US to sequester hydrophobic organic compounds (HOCs) that are indicative of urbanization. A microscale assay the P450RGS, which responds to compounds that bind to the aryl hydrocarbon receptor (AhR), and the Fluoroscan,...
Rise and fall over 26 years of a marine epizootic in Hawaiian green sea turtles
Milani Chaloupka, George H. Balazs, Thierry M. Work
2009, Journal of Wildlife Diseases (45) 1138-1142
Estimates of chronic disease prevalence are needed to improve our understanding of marine disease epizootiology, which is poorly known for marine megafauna such as marine turtles. An emerging worldwide threat to green sea turtles (Chelonia mydas) is fibropapillomatosis (FP), which is a pandemic tumor-forming disease associated with herpesviruses. We report...
Temporal latitudinal-gradient dynamics and tropical instability of deep-sea species diversity
Moriaki Yasuhara, G. Hunt, T. M. Cronin, H. Okahashi
2009, Proceedings of the National Academy of Sciences of the United States of America (106) 21717-21720
A benthic microfaunal record from the equatorial Atlantic Ocean over the past four glacial-interglacial cycles was investigated to understand temporal dynamics of deep-sea latitudinal species diversity gradients (LSDGs). The results demonstrate unexpected instability and high amplitude fluctuations of species diversity in the tropical deep ocean that are correlated with orbital-scale...
Northern Monterey Bay upwelling shadow front: Observations of a coastally and surface-trapped buoyant plume
C.B. Woodson, L. Washburn, J.A. Barth, D.J. Hoover, A.R. Kirincich, M.A. McManus, J.P. Ryan, J. Tyburczy
2009, Journal of Geophysical Research C: Oceans (114)
During the upwelling season in central California, northwesterly winds along the coast produce a strong upwelling jet that originates at Point A??o Nuevo and flows southward across the mouth of Monterey Bay. A convergent front with a mean temperature change of 3.77 ?? 0.29??C develops between the warm interior waters...
Simulating and understanding sand wave variation: A case study of the Golden Gate sand waves
F. Sterlini, S.J.M.H. Hulscher, D.M. Hanes
2009, Journal of Geophysical Research F: Earth Surface (114)
In this paper we present a detailed comparison between measured features of the Golden Gate sand wave field and the results of a nonlinear sand wave model. Because the Golden Gate sand waves exhibit large variation in their characteristics and in their environmental physics, this area gives us the opportunity...
Effects of rodent community diversity and composition on prevalence of an endemic bacterial pathogen - Bartonella
Y. Bai, M.Y. Kosoy, C.H. Calisher, J.F. Cully Jr., S.K. Collinge
2009, Biodiversity (10) 3-11
By studying Bartonella prevalence in rodent communities from 23 geographic sites in the western United States and one site in northern Mexico, the present study focused on the effects of rodent community diversity (measured by richness and Shannon index) and composition on prevalence of Bartonella infections. The analysis showed negative correlations of Bartonella prevalence with rodent...
Estimating nitrogen loading to ground water and assessing vulnerability to nitrate contamination in a large karstic springs Basin, Florida
B. G. Katz, A.A. Sepulveda, R.J. Verdi
2009, Journal of the American Water Resources Association (45) 607-627
A nitrogen (N) mass-balance budget was developed to assess the sources of N affecting increasing ground-water nitrate concentrations in the 960-km 2 karstic Ichetucknee Springs basin. This budget included direct measurements of N species in rainfall, ground water, and spring waters, along with estimates of N loading from fertilizers, septic...
Scaling the effects of moose browsing on forage distribution, from the geometry of plant canopies to landscapes
N. R. De Jager, J. Pastor, A.L. Hodgson
2009, Ecological Monographs (79) 281-297
Landscape heterogeneity influences large herbivores by altering their feeding rates, but as herbivores attempt to maximize feeding rates they also create spatial heterogeneity by altering plant growth. Herbivore feeding rates thus provide a quantitative link between the causes and consequences of spatial heterogeneity in herbivore-dominated ecosystems. The fractal geometry of...
Factors influencing densities of non-indigenous species in the ballast water of ships arriving at ports in Puget Sound, Washington, United States
J.R. Cordell, D. J. Lawrence, N.C. Ferm, L.M. Tear, S.S. Smith, R.P. Herwig
2009, Aquatic Conservation: Marine and Freshwater Ecosystems (19) 322-343
Oceanographic characteristics and the presence of international shipping in Puget Sound, Washington, USA contribute to its vulnerability to non-indigenous species (NIS) invasions. To evaluate NIS arriving in ballast water, zooplankton was sampled in 380 ballast tanks of ships after they entered Puget Sound. Taxa were classified into a higher risk...
Isotopic composition of low-latitude paleoprecipitation during the Early Cretaceous
M.B. Suarez, Luis A. Gonzalez, Greg A. Ludvigson, F.J. Vega, J. Alvarado-Ortega
2009, Geological Society of America Bulletin (121) 1584-1595
The response of the hydrologic cycle in global greenhouse conditions is important to our understanding of future climate change and to the calibration of global climate models. Past greenhouse conditions, such as those of the Cretaceous, can be used to provide empirical data with which to evaluate climate models. Recent...
SBAS-InSAR analysis of surface deformation at Mauna Loa and Kilauea volcanoes in Hawaii
F. Casu, Riccardo Lanari, E. Sansosti, G. Solaro, Pietro Tizzani, Michael Poland, Asta Mikijus
2009, Conference Paper, International Geoscience and Remote Sensing Symposium (IGARSS)
We investigate the deformation of Mauna Loa and Kllauea volcanoes, Hawai'i, by exploiting the advanced differential Synthetic Aperture Radar Interferometry (InSAR) technique referred to as the Small BAseline Subset (SBAS) algorithm. In particular, we present time series of line-of-sight (LOS) displacements derived from SAR data acquired by the ASAR instrument,...
Geology and geomorphology of Bear Lake Valley and upper Bear River, Utah and Idaho
M.C. Reheis, B.J.C. Laabs, D. S. Kaufman
2009, Special Paper of the Geological Society of America 15-48
Bear Lake, on the Idaho-Utah border, lies in a fault-bounded valley through which the Bear River flows en route to the Great Salt Lake. Surficial deposits in the Bear Lake drainage basin provide a geologic context for interpretation of cores from Bear Lake deposits. In addition to groundwater discharge, Bear...
Systematic approaches to comprehensive analyses of natural organic matter
Jerry A. Leenheer
2009, Annals of Environmental Science (3) 1-130
The more that is learned of the chemistry of aquatic natural organic matter (NOM) the greater is the scientific appreciation of the vast complexity of this subject. This complexity is due not only to a multiplicity of precursor molecules in any environment but to their associations with each other and...
Mercury and trace element contents of Donbas coals and associated mine water in the vicinity of Donetsk, Ukraine
A. Kolker, B.S. Panov, Y.B. Panov, E. R. Landa, K.M. Conko, V.A. Korchemagin, T. Shendrik, J.D. McCord
2009, International Journal of Coal Geology (79) 83-91
Mercury-rich coals in the Donets Basin (Donbas region) of Ukraine were sampled in active underground mines to assess the levels of potentially harmful elements and the potential for dispersion of metals through use of this coal. For 29 samples representing c11 to m3 Carboniferous coals, mercury contents range from 0.02...
Postmortem diagnostic investigation of disease in free-ranging marine turtle populations: A review of common pathologic findings and protocols
Mark Flint, Janet C. Patterson-Kane, C.J. Limpus, Thierry M. Work, David Blair, Paul C. Mills
2009, Journal of Veterinary Diagnostic Investigation (21) 733-759
Over the past few decades, there have been increasing numbers of reports of diseases in marine turtles. Furthermore, in recent years, there have been documented instances of apparently new diseases emerging in these species of which the etiology and/or pathogenesis remain unknown. These instances i) raise concern for the survival...
U.S. Geological Survey research in Handcart Gulch, Colorado—An alpine watershed with natural acid-rock drainage
Andrew H. Manning, Jonathan S. Caine, Philip L. Verplanck, Dana J. Bove, Katherine G. Kahn
2009, Conference Paper, Planning for an uncertain future - Monitoring, integration, and adaptation (SIR 2009-5049)
Handcart Gulch is an alpine watershed along the Continental Divide in the Colorado Rocky Mountain Front Range. It contains an unmined mineral deposit typical of many hydrothermal mineral deposits in the intermountain west, composed primarily of pyrite with trace metals including copper and molybdenum. Springs and the trunk stream have...
Bivergent thrust wedges surrounding oceanic island arcs: Insight from observations and sandbox models of the northeastern caribbean plate
Uri S. ten Brink, S. Marshak, Bruna J.L. Granja
2009, Geological Society of America Bulletin (121) 1522-1536
At several localities around the world, thrust belts have developed on both sides of oceanic island arcs (e.g., Java-Timor, Panama, Vanuatu, and the northeastern Caribbean). In these localities, the overall vergence of the backarc thrust belt is opposite to that of the forearc thrust belt. For example, in the northeastern...
Trends in concentrations and use of agricultural herbicides for Corn Belt rivers, 1996-2006
Aldo V. Vecchia, Robert J. Gilliom, Daniel J. Sullivan, David L. Lorenz, Jeffrey D. Martin
2009, Environmental Science & Technology (43) 9096-9102
Trends in the concentrations and agricultural use of four herbicides (atrazine, acetochlor, metolachlor, and alachlor) were evaluated for major rivers of the Corn Belt for two partially overlapping time periods: 1996-2002 and 2000-2006. Trends were analyzed for 11 sites on the mainstems and selected tributaries in the Ohio, Upper Mississippi,...
Mesozoic magmatism in an upper- to middle-crustal section through the Cordilleran continental margin arc, eastern Transverse Ranges, California
S.K. Needy, J. L. Anderson, J. L. Wooden, R.J. Fleck, A. P. Barth, Scott R. Paterson, V. Memeti, G.S. Pignotta
2009, Special Paper of the Geological Society of America 187-218
The eastern Transverse Ranges provide essentially continuous exposure for >100 km across the strike of the Mesozoic Cordilleran orogen. Thermobarometric calculations based on hornblende and plagioclase compositions in Mesozoic plutonic rocks show that the fi rst-order distribution of rock units resulted from differential Laramide exhumation. Mesozoic supracrustal rocks are preserved...
Integrated sequence stratigraphy of the postimpact sediments from the Eyreville core holes, Chesapeake Bay impact structure inner basin
James V. Browning, K.G. Miller, P.P. McLaughlin Jr., Lucy E. Edwards, A.A. Kulpecz, David S. Powars, B.S. Wade, M.D. Feigenson, J.D. Wright
2009, Special Paper of the Geological Society of America 775-810
The Eyreville core holes provide the first continuously cored record of postimpact sequences from within the deepest part of the central Chesapeake Bay impact crater. We analyzed the upper Eocene to Pliocene postimpact sediments from the...
Geologic columns for the ICDP-USGS Eyreville A and B cores, Chesapeake Bay impact structure: Sediment-clast breccias, 1096 to 444 m depth
Lucy E. Edwards, David S. Powars, Gregory Gohn, H. Dypvik
2009, Special Paper of the Geological Society of America 51-89
The Eyreville A and B cores, recovered from the “moat” of the Chesapeake Bay impact structure, provide a thick section of sediment-clast breccias and minor stratified sediments from 1095.74 to 443.90 m. This paper discusses the...
Detecting declines in the abundance of a bull trout (Salvelinus confluentus) population: Understanding the accuracy, precision, and costs of our efforts
R. Al-Chokhachy, P. Budy, M. Conner
2009, Canadian Journal of Fisheries and Aquatic Sciences (66) 649-658
Using empirical field data for bull trout (Salvelinus confluentus), we evaluated the trade-off between power and sampling effort-cost using Monte Carlo simulations of commonly collected mark-recapture-resight and count data, and we estimated the power to detect changes in abundance across different time intervals. We also evaluated the effects of monitoring...
Postglacial sedimentary record of the Southern California continental shelf and slope, Point Conception to Dana Point
C.K. Sommerfield, H.J. Lee, W. R. Normark
2009, Special Paper of the Geological Society of America 89-115
Sedimentary strata on the Southern California shelf and slope (Point Conception to Dana Point) display patterns and rates of sediment accumulation that convey information on sea-level inundation, sediment supply, and oceanic transport processes following the Last Glacial Maximum. In Santa Monica Bay and San Pedro Bay, postglacial transgression is recorded...
