Lethal and sublethal effects of ammonia to juvenile Lampsilis mussels (Unionidae) in sediment and water-only exposures
T.J. Newton, M.R. Bartsch
2007, Environmental Toxicology and Chemistry (26) 2057-2065
We compared the sensitivity of two juvenile unionid mussels (Lampsilis cardium and Lampsilis higginsii) to ammonia in 96-h water-only and sediment tests by use of mortality and growth measurements. Twenty mussels were placed in chambers buried 2.5 cm into reference sediments to approximate pore-water exposure (sediment tests) or elevated above...
Stability and uncertainty of finite-fault slip inversions: Application to the 2004 Parkfield, California, earthquake
S. Hartzell, P. Liu, C. Mendoza, C. Ji, K.M. Larson
2007, Bulletin of the Seismological Society of America (97) 1911-1934
The 2004 Parkfield, California, earthquake is used to investigate stability and uncertainty aspects of the finite-fault slip inversion problem with different a priori model assumptions. We utilize records from 54 strong ground motion stations and 13 continuous, 1-Hz sampled, geodetic instruments. Two inversion procedures are compared: a linear least-squares subfault-based...
Consequences of land-cover misclassification in models of impervious surface
Gerard McMahon
2007, Photogrammetric Engineering and Remote Sensing (73) 1343-1353
Model estimates of impervious area as a function of landcover area may be biased and imprecise because of errors in the land-cover classification. This investigation of the effects of land-cover misclassification on impervious surface models that use National Land Cover Data (NLCD) evaluates the consequences of adjusting land-cover within a...
Composite analysis for Escherichia coli at coastal beaches
E.E. Bertke
2007, Journal of Great Lakes Research (33) 335-341
At some coastal beaches, concentrations of fecal-indicator bacteria can differ substantially between multiple points at the same beach at the same time. Because of this spatial variability, the recreational water quality at beaches is sometimes determined by stratifying a beach into several areas and collecting a sample from each area...
Landslide susceptibility revealed by LIDAR imagery and historical records, Seattle, Washington
W.H. Schulz
2007, Engineering Geology (89) 67-87
Light detection and ranging (LIDAR) data were used to visually map landslides, headscarps, and denuded slopes in Seattle, Washington. Four times more landslides were mapped than by previous efforts that used aerial photographs. The mapped landforms (landslides, headscarps, and denuded slopes) were created by many individual landslides. The spatial distribution...
Insights into the use of time-lapse GPR data as observations for inverse multiphase flow simulations of DNAPL migration
R.H. Johnson, E. P. Poeter
2007, Journal of Contaminant Hydrology (89) 136-155
Perchloroethylene (PCE) saturations determined from GPR surveys were used as observations for inversion of multiphase flow simulations of a PCE injection experiment (Borden 9??m cell), allowing for the estimation of optimal bulk intrinsic permeability values. The resulting fit statistics and analysis of residuals (observed minus simulated PCE saturations) were used...
Evaluation of sulfate reduction at experimentally induced mixing interfaces using small-scale push-pull tests in an aquifer-wetland system
T.A. Kneeshaw, Jennifer T. McGuire, Erik W. Smith, Isabelle M. Cozzarelli
2007, Applied Geochemistry (22) 2618-2629
This paper presents small-scale push–pull tests designed to evaluate the kinetic controls on SO42-">SO42- reduction in situ at mixing interfaces between a wetland and aquifer impacted by landfill leachate at the Norman Landfill research site, Norman, OK. Quantifying the...
How was the Triassic Songpan-Ganzi basin filled? A provenance study
E. Enkelmann, A. Weislogel, L. Ratschbacher, E. Eide, A. Renno, J. Wooden
2007, Tectonics (26)
The Triassic Songpan-Ganzi complex comprises >200,000 km2 of 5-15 km thick turbiditic sediments. Although surrounded by several magmatic and orogenic belts, the Triassic high- and ultrahigh-pressure Qinling-Tongbai-Hong'an-Dabie (QTHD) orogen, located several hundred kilometers to the east, was proposed as its major source. Middle to Late Triassic samples from the northern...
Mass balances of mercury and nitrogen in burned and unburned forested watersheds at Acadia National Park, Maine, USA
S.J. Nelson, K.B. Johnson, J. S. Kahl, T.A. Haines, I.J. Fernandez
2007, Environmental Monitoring and Assessment (126) 69-80
Precipitation and streamwater samples were collected from 16 November 1999 to 17 November 2000 in two watersheds at Acadia National Park, Maine, and analyzed for mercury (Hg) and dissolved inorganic nitrogen (DIN, nitrate plus ammonium). Cadillac Brook watershed burned in a 1947 fire that destroyed vegetation and soil organic matter....
Landscape factors influencing the spatial distribution and abundance of mosquito vector Culex quinquefasciatus (Diptera: Culicidae) in a mixed residential-agricultural community in Hawai'i
M.E. Reiter, D.A. Lapointe
2007, Journal of Medical Entomology (44) 861-868
Mosquito-borne avian diseases, principally avian malaria (Plasmodium relictum Grassi and Feletti) and avian pox (Avipoxvirus sp.) have been implicated as the key limiting factor associated with recent declines of endemic avifauna in the Hawaiian Island archipelago. We present data on the relative abundance, infection status, and spatial distribution of the...
Water use regimes: Characterizing direct human interaction with hydrologic systems
Peter K. Weiskel, Richard M. Vogel, Peter A. Steeves, Philip J. Zarriello, Leslie A. DeSimone, Kernell G. Ries III
2007, Water Resources Research (43)
The sustainability of human water use practices is a rapidly growing concern in the United States and around the world. To better characterize direct human interaction with hydrologic systems (stream basins and aquifers), we introduce the concept of the water use regime. Unlike scalar indicators of anthropogenic hydrologic stress in...
Integrated geologic and geophysical studies of North American continental intraplate seismicity
X. Van Lanen, Walter D. Mooney
2007, Special Paper of the Geological Society of America (425) 101-112
The origin of earthquakes within stable continental regions has been the subject of debate over the past thirty years. Here, we examine the correlation of North American stable continental region earthquakes using five geologic and geophysical data sets: (1) a newly compiled age-province map; (2) Bouguer...
Elements of the iron and manganese cycles in Lake Baikal
L.Z. Granina, E. Callender
2007, Geochemistry International (45) 918-925
Using data obtained in recent years, we considered the external mass balance and characteristics of internal iron and manganese cycles in Lake Baikal (biological uptake, remineralization, sedimentary and diffusive fluxes, accumulation in sediments, time of renewal, etc.). Some previous results and common concepts were critically reevaluated. ?? Pleiades Publishing, Ltd....
Investigation of the groundwater system at Masaya Caldera, Nicaragua, using transient electromagnetics and numerical simulation
R.E. MacNeil, W. E. Sanford, C.B. Connor, S.K. Sandberg, M. Diez
2007, Journal of Volcanology and Geothermal Research (166) 217-232
The distribution of groundwater beneath Masaya Volcano, in Nicaragua, and its surrounding caldera was characterized using the transient electromagnetic method (TEM). Multiple soundings were conducted at 30 sites. Models of the TEM data consistently indicate a resistive layer that is underlain by one or more conductive layers. These two layers...
The oxygen-18 isotope approach for measuring aquatic metabolism in high-productivity waters
Craig R. Tobias, John Karl Bohlke, Judson W. Harvey
2007, Limnology and Oceanography (52) 1439-1453
We examined the utility of δ18O2 measurements in estimating gross primary production (P), community respiration (R), and net metabolism (P : R) through diel cycles in a productive agricultural stream located in the midwestern U.S.A. Large diel swings in O2(±200 µmol L−1) were accompanied by large diel variation in δ18O2 (±10‰). Simultaneous...
Mid-Pliocene planktic foraminifer assemblage of the North Atlantic Ocean
H.J. Dowsett, M.M. Robinson
2007, Micropaleontology (53) 105-126
The US Geological Survey Pliocene Research, Interpretation and Synoptic Mapping (PRISM) North Atlantic faunal data set provides a unique, temporally constrained perspective to document and evaluate the quantitative geographic distribution of key mid-Pliocene taxa. Planktic foraminifer census data from within the PRISM time slab (3.29 to 2.97 Ma) at thirteen...
A simple model for calculating tsunami flow speed from tsunami deposits
B. E. Jaffe, G. Gelfenbuam
2007, Sedimentary Geology (200) 347-361
This paper presents a simple model for tsunami sedimentation that can be applied to calculate tsunami flow speed from the thickness and grain size of a tsunami deposit (the inverse problem). For sandy tsunami deposits where grain size and thickness vary gradually...
Invasive plants and their ecological strategies: Prediction and explanation of woody plant invasion in New England
P.M. Herron, C.T. Martine, A.M. Latimer, S. A. Leicht-Young
2007, Diversity and Distributions (13) 633-644
Effective management of introduced species requires the early identification of species that pose a significant threat of becoming invasive. To better understand the invasive ecology of species in New England, USA, we compiled a character data set with which to compare non-native species that are known invaders to non-native species...
Improving GPR image resolution in lossy ground using dispersive migration
C.P. Oden, M.H. Powers, D.L. Wright, G.R. Olhoeft
2007, Conference Paper, IEEE Transactions on Geoscience and Remote Sensing
As a compact wave packet travels through a dispersive medium, it becomes dilated and distorted. As a result, ground-penetrating radar (GPR) surveys over conductive and/or lossy soils often result in poor image resolution. A dispersive migration method is presented that combines an inverse dispersion filter with frequency-domain migration. The method...
Structure and composition of a watershed-scale sediment information network
W. R. Osterkamp, J. R. Gray, J.B. Laronne, J.R. Martin
2007, International Journal of Sediment Research (22) 238-246
A 'Watershed-Scale Sediment Information Network' (WaSSIN), designed to complement UNESCO's International Sedimentation Initiative, was endorsed as an initial project by the World Association for Sedimentation and Erosion Research. WaSSIN is to address global fluvial-sediment information needs through a network approach based on consistent protocols for the collection, analysis, and storage...
Estimating locations and total magnetization vectors of compact magnetic sources from scalar, vector, or tensor magnetic measurements through combined Helbig and Euler analysis
J. D. Phillips, M.N. Nabighian, D.V. Smith, Y. Li
2007, Conference Paper, SEG Technical Program Expanded Abstracts
The Helbig method for estimating total magnetization directions of compact sources from magnetic vector components is extended so that tensor magnetic gradient components can be used instead. Depths of the compact sources can be estimated using the Euler equation, and their dipole moment magnitudes can be estimated using a least...
Clean coal initiatives in Indiana
B.H. Bowen, M.W. Irwin, F.T. Sparrow, Maria Mastalerz, Z. Yu, R.A. Kramer
2007, International Journal of Energy Sector Management (1) 96-108
Purpose - Indiana is listed among the top ten coal states in the USA and annually mines about 35 million short tons (million tons) of coal from the vast reserves of the US Midwest Illinois Coal Basin. The implementation and commercialization of clean coal technologies is important to the economy...
Physical and hormonal examination of Missouri River shovelnose sturgeon reproductive stage: A reference guide
M. L. Wildhaber, D. M. Papoulias, A. J. DeLonay, D. E. Tillitt, J.L. Bryan, M.L. Annis
2007, Journal of Applied Ichthyology (23) 382-401
From May 2001 to June 2002 Wildhaber et al. (2005) conducted monthly sampling of Lower Missouri River shovelnose sturgeon (Scaphirhynchus platorynchus) to develop methods for determination of sex and the reproductive stage of sturgeons in the field. Shovelnose sturgeon were collected from the Missouri River and ultrasonic and endoscopic imagery and...
Postearthquake relaxation and aftershock accumulation linearly related after the 2003 M 6.5 Chengkung, Taiwan, and the 2004 M 6.0 Parkfield, California, earthquakes
J.C. Savage, S.-B. Yu
2007, Bulletin of the Seismological Society of America (97) 1632-1645
We treat both the number of earthquakes and the deformation following a mainshock as the superposition of a steady background accumulation and the postearthquake process. The preseismic displacement and seismicity rates ru and rE are used as estimates of the background rates. Let t be the time after the...
An automated approach to detecting signals in electroantennogram data
D. H. Slone, B.T. Sullivan
2007, Journal of Chemical Ecology (33) 1748-1762
Coupled gas chromatography/electroantennographic detection (GC-EAD) is a widely used method for identifying insect olfactory stimulants present in mixtures of volatiles, and it can greatly accelerate the identification of insect semiochemicals. In GC-EAD, voltage changes across an insect's antenna are measured while the antenna is exposed to compounds eluting from a...
