Influence of pH on the acute toxicity of ammonia to juvenile freshwater mussels (fatmucket, Lampsills siliquoidea)
N. Wang, R.J. Erickson, C.G. Ingersoll, C.D. Ivey, E.L. Brunson, T. Augspurger, M.C. Barnhart
2008, Environmental Toxicology and Chemistry (27) 1141-1146
The objective of the present study was to evaluate the influence of pH on the toxicity of ammonia to juvenile freshwater mussels. Acute 96-h ammonia toxicity tests were conducted with 10-d-old juvenile mussels (fatmucket, Lampsilis siliquoidea) at five pH levels ranging from 6.5 to 9.0 in flow-through diluter systems at...
Integrating remotely sensed land cover observations and a biogeochemical model for estimating forest ecosystem carbon dynamics
J. Liu, S. Liu, Thomas R. Loveland, L.L. Tieszen
2008, Ecological Modelling (219) 361-372
Land cover change is one of the key driving forces for ecosystem carbon (C) dynamics. We present an approach for using sequential remotely sensed land cover observations and a biogeochemical model to estimate contemporary and future ecosystem carbon trends. We applied the General Ensemble Biogeochemical Modelling System (GEMS) for the...
Using the FORE-SCE model to project land-cover change in the southeastern United States
Terry Sohl, Kristi L. Sayler
2008, Ecological Modelling (219) 49-65
A wide variety of ecological applications require spatially explicit current and projected land-use and land-cover data. The southeastern United States has experienced massive land-use change since European settlement and continues to experience extremely high rates of forest cutting, significant urban development, and changes in agricultural land use. Forest-cover patterns and...
Permeability of continental crust influenced by internal and external forcing
S.A. Rojstaczer, S. E. Ingebritsen, D.O. Hayba
2008, Geofluids (8) 128-139
The permeability of continental crust is so highly variable that it is often considered to defy systematic characterization. However, despite this variability, some order has been gleaned from globally compiled data. What accounts for the apparent coherence of mean permeability in the continental crust (and permeability–depth relations) on a very...
ALLTEM UXO detection and discrimination
T.H. Asch, D.L. Wright, C.W. Moulton, T.P. Irons, M.N. Nabighian
2008, Conference Paper, SEG Technical Program Expanded Abstracts
ALLTEM is a multi-axis electromagnetic induction system designed for unexploded ordnance (UXO) applications. It uses a continuous triangle-wave excitation and provides good late-time signal-to-noise ratio (SNR) especially for ferrous targets. Multi-axis transmitter (Tx) and receiver (Rx) systems such as ALLTEM provide a richer data set from which to invert for...
Validation of exposure time for discharge measurements made with two bottom-tracking acoustic doppler current profilers
J. A. Czuba, K. Oberg
2008, Conference Paper, Proceedings of the IEEE working conference on current measurement technology
Previous work by Oberg and Mueller of the U.S. Geological Survey in 2007 concluded that exposure time (total time spent sampling the flow) is a critical factor in reducing measurement uncertainty. In a subsequent paper, Oberg and Mueller validated these conclusions using one set of data to show that the...
Evaluation of a method for determining concentrations of isoeugenol, an AQUI-S residue, in fillet tissue from freshwater fish species.
J.R. Meinertz, Theresa M. Schreier, J.A. Bernardy
2008, Journal of AOAC International (91) 884-891
AQUI-S is a fish anesthetic/sedative that is approved for use in a number of countries throughout the world and has the potential for use in the United States. The active ingredient in AQUI-S is isoeugenol. A method for determining isoeugenol concentrations in edible fillet tissue is needed for regulatory purposes,...
MODIS and SeaWIFS on-orbit lunar calibration
Jielun Sun, R.E. Eplee Jr., X. Xiong, T. Stone, G. Meister, C.R. McClain
2008, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
The Moon plays an important role in the radiometric stability monitoring of the NASA Earth Observing System's (EOS) remote sensors. The MODIS and SeaWIFS are two of the key instruments for NASA's EOS missions. The MODIS Protoflight Model (PFM) on-board the Terra spacecraft and the MODIS Flight Model 1 (FM1)...
Trends of pesticides and nitrate in ground water of the Central Columbia Plateau, Washington, 1993-2003
L. Frans
2008, Conference Paper, Journal of Environmental Quality
Pesticide and nitrate data for ground water sampled in the Central Columbia Plateau, Washington, between 1993 and 2003 by the U.S. Geological Survey National Water-Quality Assessment Program were evaluated for trends in concentration. A total of 72 wells were sampled in 1993-1995 and again in 2002-2003 in three well networks...
Decadal-scale changes of nitrate in ground water of the United States, 1988-2004
Michael G. Rupert
2008, Journal of Environmental Quality (37) S240-S248
This study evaluated decadal-scale changes of nitrate concentrations in groundwater samples collected by the USGS National Water-Quality Assessment Program from 495 wells in 24 well networks across the USA in predominantly agricultural areas. Each well network was sampled once during 1988-1995 and resampled once during 2000-2004. Statistical tests of decadal-scale...
Monitoring programs to assess reintroduction efforts: A critical component in recovery
E. Muths, V. Dreitz
2008, Animal Biodiversity and Conservation (31) 47-56
Reintroduction is a powerful tool in our conservation toolbox. However, the necessary follow-up, i.e. long-term monitoring, is not commonplace and if instituted may lack rigor. We contend that valid monitoring is possible, even with sparse data. We present a means to monitor based on demographic data and a projection model...
Deformation and stress-change modeling at Sierra Negra volcano, Galapagos, from ENVISAT INSAR and GPS observations
Sigurjon Jonsson, W.W. Chadwick, Michael Poland, D. Geist
2008, Conference Paper, European Space Agency, (Special Publication) ESA SP
We use radar interferograms and GPS observations to constrain models of magma accumulation and faulting at Sierra Negra volcano, Galápagos, during the years before its 2005 eruption. The data have shown ~5 m of pre-eruption uplift and multiple trapdoor faulting events on an intra-caldera fault system. We find the...
Fate and transport of pesticides in the ground water systems of southwest Georgia, 1993-2005
M.S. Dalton, E. A. Frick
2008, Conference Paper, Journal of Environmental Quality
Modern agricultural practices in the United States have resulted in nearly unrivaled efficiency and productivity. Unfortunately, there is also the potential for release of these compounds to the environment and consequent adverse affects on wildlife and human populations. Since 1993, the National Water-Quality Assessment (NAWQA) program of the U.S. Geological...
Measuring gravity currents in the Chicago River, Chicago, Illinois
K. A. Oberg, J. A. Czuba, K. K. Johnson
2008, Conference Paper, Proceedings of the IEEE working conference on current measurement technology
Recent studies of the Chicago River have determined that gravity currents are responsible for persistent bidirectional flows that have been observed in the river. A gravity current is the flow of one fluid within another caused by a density difference between the fluids. These studies demonstrated how acoustic Doppler current...
Dual-RiverSonde measurements of two-dimensional river flow patterns
C.C. Teague, D.E. Barrick, P.M. Lilleboe, Ralph T. Cheng, Paul Stumpner, Jon R. Burau
2008, Conference Paper, Proceedings of the IEEE Working Conference on Current Measurement Technology
Two-dimensional river flow patterns have been measured using a pair of RiverSondes in two experiments in the Sacramento-San Joaquin River Delta system of central California during April and October 2007. An experiment was conducted at Walnut Grove, California in order to explore the use of dual RiverSondes to measure flow...
L5 TM radiometric recalibration procedure using the internal calibration trends from the NLAPS trending database
G. Chander, Md. O. Haque, E. Micijevic, J. A. Barsi
2008, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
From the Landsat program's inception in 1972 to the present, the earth science user community has benefited from a historical record of remotely sensed data. The multispectral data from the Landsat 5 (L5) Thematic Mapper (TM) sensor provide the backbone for this extensive archive. Historically, the radiometric calibration procedure for...
Radiometric cross-calibration of the Terra MODIS and Landsat 7 ETM+ using an invariant desert site
T. Choi, A. Angal, G. Chander, X. Xiong
2008, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
A methodology for long-term radiometric cross-calibration between the Terra Moderate Resolution Imaging Spectroradiometer (MODIS) and Landsat 7 (L7) Enhanced Thematic Mapper Plus (ETM+) sensors was developed. The approach involves calibration of near-simultaneous surface observations between 2000 and 2007. Fifty-seven cloud-free image pairs were carefully selected over the Libyan desert for...
Agriculture-related trends in groundwater quality of the glacial deposits aquifer, central Wisconsin
D. A. Saad
2008, Conference Paper, Journal of Environmental Quality
Measuring and understanding trends in groundwater quality is necessary for determining whether changes in land-management practices have an effect on groundwater quality. This paper describes an approach that was used to measure and understand trends using data from two groundwater studies conducted in central Wisconsin as part of the USGS...
100 Myr record of sequences, sedimentary facies and sea level change from Ocean Drilling Program onshore coreholes, US Mid-Atlantic coastal plain
J.V. Browning, K.G. Miller, P. J. Sugarman, M.A. Kominz, P.P. McLaughlin, A.A. Kulpecz, M.D. Feigenson
2008, Basin Research (20) 227-248
We analyzed the latest Early Cretaceous to Miocene sections (???110-7Ma) in 11 New Jersey and Delaware onshore coreholes (Ocean Drilling Program Legs 150X and 174AX). Fifteen to seventeen Late Cretaceous and 39-40 Cenozoic sequence boundaries were identified on the basis of physical and temporal breaks. Within-sequence changes follow predictable patterns...
Zero-inflated modeling of fish catch per unit area resulting from multiple gears: Application to channel catfish and shovelnose sturgeon in the Missouri River
A. Arab, M. L. Wildhaber, C. K. Wikle, C.N. Gentry
2008, North American Journal of Fisheries Management (28) 1044-1058
Fisheries studies often employ multiple gears that result in large percentages of zero values. We considered a zero-inflated Poisson (ZIP) model with random effects to address these excessive zeros. By employing a Bayesian ZIP model that simultaneously incorporates data from multiple gears to analyze data from the Missouri River, we...
Downflow limestone beds for treatment of net-acidic, oxic, iron-laden drainage from a flooded Anthracite Mine, Pennsylvania, USA: 1. Field evaluation
C.A. Cravotta III, S.J. Ward
2008, Mine Water and the Environment (27) 67-85
Passive-treatment systems that route acidic mine drainage (AMD) through crushed limestone and/or organic-rich substrates have been used to remove the acidity and metals from various AMD sources, with a wide range of effects. This study evaluates treatment of net-acidic, oxic, iron-laden AMD with limestone alone, and with organic-rich compost layered...
The release of dissolved actinium to the ocean: A global comparison of different end-members
W. Geibert, M. Charette, G. Kim, W.S. Moore, J. Street, M. Young, A. Paytan
2008, Marine Chemistry (109) 409-420
The measurement of short-lived 223Ra often involves a second measurement for supported activities, which represents 227Ac in the sample. Here we exploit this fact, presenting a set of 284 values on the oceanic distribution of 227Ac, which was collected when analyzing water samples for short-lived radium isotopes by the radium...
Using semi-permeable membrane devices and stable nitrogen isotopes to detect anthropogenic influences on the Truckee River, USA
L. Saito, Michael R. Rosen, S. Chandra, C.H. Fritsen, J.A. Arufe, C. Redd
2008, Environmental Engineering Science (25) 585-600
Stable nitrogen isotopes (??15N) and semipermeable membrane devices (SPMDs) were used together to provide evidence of potential anthropogenic connections to aquatic organisms in the Truckee River, which flows through the Reno/Sparks metropolitan area in Nevada. Crayfish, snail, and periphyton ??15N values, and SPMD toxicity data collected during high and low...
Amphipod densities and indices of wetland quality across the upper-Midwest, USA
M.J. Anteau, A. D. Afton
2008, Wetlands (28) 184-196
Nutritional, behavioral, and diet data for lesser scaup (Aythya affinis [Eyton, 1838]) indicates that there has been a decrease in amphipod (Gammarus lacustris [G. O. Sars, 1863] and Hyalella azteca [Saussure, 1858]) density and wetland quality throughout the upper-Midwest, USA. Accordingly, we estimated densities of Gammarus and Hyalella in six...
Evaluation of Landsat-7 SLC-off image products for forest change detection
Michael A. Wulder, Stephanie M. Ortlepp, Joanne C. White, Susan Maxwell
2008, Canadian Journal of Remote Sensing (34) 93-99
Since July 2003, Landsat-7 ETM+ has been operating without the scan line corrector (SLC), which compensates for the forward motion of the satellite in the imagery acquired. Data collected in SLC-off mode have gaps in a systematic wedge-shaped pattern outside of the central 22 km swath of the imagery; however,...
