Mercury effects on predator avoidance behavior of a forage fish, golden shiner (Notemigonus crysoleucas)
H.M. Webber, T.A. Haines
2003, Environmental Toxicology and Chemistry (22) 1556-1561
Mercury contamination of fish is widespread in North America and has resulted in the establishment of fish consumption advisories to protect human health, However, the effects of mercury exposure to fish have seldom been investigated. We examined the effects of dietary mercury exposure at environmental levels in a common forage...
Ostracode-based reconstruction from 23,300 to about 20,250 cal yr BP of climate, and paleohydrology of a groundwater-fed pond near St. Louis, Missouri
B. Curry, D. Delorme
2003, Journal of Paleolimnology (29) 199-207
The water chemistry of a groundwater-fed sinkhole-pond near St. Louis, Missouri, and its associated climate during the last glaciation are reconstructed by comparison with autecological data of modern ostracodes from about 5,500 sites in Canada. A 4.8-m succession of fossiliferous sediment yielded ostracode assemblages that collectively are generally found today...
Latitudinal comparisons of walleye growth in North America and factors influencing growth of walleyes in Kansas reservoirs
M.C. Quist, C.S. Guy, R.D. Schultz, J.L. Stephen
2003, North American Journal of Fisheries Management (23) 677-692
We compared the growth of walleyes Stizostedion vitreum in Kansas to that of other populations throughout North America and determined the effects of the abundance of gizzard shad Dorosoma cepedianum and temperature on the growth of walleyes in Kansas reservoirs. Age was estimated from scales and otoliths collected from walleyes...
Effects of disturbance on contribution of energy sources to growth of juvenile chinook salmon (Oncorhynchus tshawytscha) in boreal streams
R.W. Perry, M.J. Bradford, J.A. Grout
2003, Canadian Journal of Fisheries and Aquatic Sciences (60) 390-400
We used stable isotopes of carbon in a growth-dependent tissue-turnover model to quantify the relative contribution of autochthonous and terrestrial energy sources to juvenile chinook salmon (Oncorhynchus tshawytscha) in five small boreal streams tributary to the upper Yukon River. We used a tissue-turnover model because fish did not grow enough...
Estimation of ground motion for Bhuj (26 January 2001; Mw 7.6) and for future earthquakes in India
S.K. Singh, B.K. Bansal, S.N. Bhattacharya, J.F. Pacheco, R.S. Dattatrayam, M. Ordaz, G. Suresh, Kamal, S. E. Hough
2003, Bulletin of the Seismological Society of America (93) 353-370
Only five moderate and large earthquakes (Mw ≥5.7) in India—three in the Indian shield region and two in the Himalayan arc region—have given rise to multiple strong ground-motion recordings. Near-source data are available for only two of these events. The Bhuj earthquake (Mw 7.6), which...
Projecting global datasets to achieve equal areas
E.L. Usery, M.P. Finn, J.D. Cox, T. Beard, S. Ruhl, M. Bearden
2003, Cartography and Geographic Information Science (30) 69-79
Scientists routinely accomplish global modeling in the raster domain, but recent research has indicated that the transformation of large areas through map projection equations leads to errors. This research attempts to gauge the extent of map projection and resampling effects on the tabulation of categorical areas by comparing the results...
Modeling Np and Pu transport with a surface complexation model and spatially variant sorption capacities: Implications for reactive transport modeling and performance assessments of nuclear waste disposal sites
P. D. Glynn
2003, Computers & Geosciences (29) 331-349
One-dimensional (1D) geochemical transport modeling is used to demonstrate the effects of speciation and sorption reactions on the ground-water transport of Np and Pu, two redox-sensitive elements. Earlier 1D simulations (Reardon, 1981) considered the kinetically limited dissolution of calcite and its effect on ion-exchange reactions (involving 90Sr, Ca, Na, Mg and...
A finite-volume ELLAM for three-dimensional solute-transport modeling
T.F. Russell, C.I. Heberton, Leonard F. Konikow, G.Z. Hornberger
2003, Ground Water (41) 258-272
A three-dimensional finite-volume ELLAM method has been developed, tested, and successfully implemented as part of the U.S. Geological Survey (USGS) MODFLOW-2000 ground water modeling package. It is included as a solver option for the Ground Water Transport process. The FVELLAM uses space-time finite volumes oriented along the streamlines of the...
Development of small carbonate banks on the south Florida platform margin: Response to sea level and climate change
David J. Mallinson, Albert C. Hine, Pamela Hallock, Stanley D. Locker, Eugene Shinn, David Naar, Brian Donahue, Douglas C. Weaver
2003, Marine Geology (199) 45-63
Geophysical and coring data from the Dry Tortugas, Tortugas Bank, and Riley’s Hump on the southwest Florida margin reveal the stratigraphic framework and growth history of these carbonate banks. The Holocene reefs of the Dry Tortugas and Tortugas Bank are approximately 14 and 10 m thick, respectively, and are situated...
Using regression methods to estimate stream phosphorus loads at the Illinois River, Arkansas
B. E. Haggard, T. S. Soerens, W. R. Green, R. P. Richards
2003, Applied Engineering in Agriculture (19) 187-194
The development of total maximum daily loads (TMDLs) requires evaluating existing constituent loads in streams. Accurate estimates of constituent loads are needed to calibrate watershed and reservoir models for TMDL development. The best approach to estimate constituent loads is high frequency sampling, particularly during storm events, and mass integration of...
Influence of flow and temperature on survival of wild subyearling fall chinook salmon in the Snake River
W.P. Connor, H.L. Burge, J.R. Yearsley, T.C. Bjornn
2003, North American Journal of Fisheries Management (23) 362-375
Summer flow augmentation to increase the survival of wild subyearling fall chinook salmon Oncorhynchus tshawytscha is implemented annually to mitigate for the development of the hydropower system in the Snake River basin, but the efficacy of this practice has been disputed. We studied some of the factors affecting survival of...
Interactions between dissolved organic matter and mercury in the Florida Everglades
G. Aiken, M. Haitzer, J. N. Ryan, K. Nagy, George Aiken
Boutron C.Ferrari C., editor(s)
2003, Journal De Physique. IV : JP (107) 29-32
Experiments were conducted using organic matter isolated from various surface waters in the Florida Everglades to study the interactions between dissolved organic matter (DOM) and Hg (II). Conditional distribution coefficients ( ), obtained using an equilibriurn dialysis ligand exchange method, were strongly affected by...
The saturated zone at Yucca Mountain: An overview of the characterization and assessment of the saturated zone as a barrier to potential radionuclide migration
A.-A. Eddebbarh, G.A. Zyvoloski, B.A. Robinson, E. M. Kwicklis, P.W. Reimus, B.W. Arnold, T. Corbet, S.P. Kuzio, C. Faunt
2003, Journal of Contaminant Hydrology (62-63) 477-493
The US Department of Energy is pursuing Yucca Mountain, Nevada, for the development of a geologic repository for the disposal of spent nuclear fuel and high-level radioactive waste, if the repository is able to meet applicable radiation protection standards established by the US Nuclear Regulatory Commission and the US Environmental...
Simulating ground water-lake interactions: Approaches and insights
R. J. Hunt, H.M. Haitjema, J. T. Krohelski, D. T. Feinstein
2003, Ground Water (41) 227-237
Approaches for modeling lake-ground water interactions have evolved significantly from early simulations that used fixed lake stages specified as constant head to sophisticated LAK packages for MODFLOW. Although model input can be complex, the LAK package capabilities and output are superior to methods that rely on a fixed lake stage...
Shallow soil CO2 flow along the San Andreas and Calaveras Faults, California
J.L. Lewicki, William C. Evans, G.E. Hilley, M.L. Sorey, J.D. Rogie, S.L. Brantley
2003, Journal of Geophysical Research B: Solid Earth (108)
We evaluate a comprehensive soil CO2 survey along the San Andreas fault (SAF) in Parkfield, and the Calaveras fault (CF) in Hollister, California, in the context of spatial and temporal variability, origin, and transport of CO2 in fractured terrain. CO2 efflux was measured within grids with portable instrumentation and continously...
Slip distribution of the 1952 Tokachi-Oki earthquake (M 8.1) along the Kuril Trench deduced from tsunami waveform inversion
K. Hirata, E. Geist, K. Satake, Y. Tanioka, S. Yamaki
2003, Journal of Geophysical Research B: Solid Earth (108)
We inverted 13 tsunami waveforms recorded in Japan to estimate the slip distribution of the 1952 Tokachi-Oki earthquake (M 8.1), which occurred southeast off Hokkaido along the southern Kuril subduction zone. The previously estimated source area determined from tsunami travel times [Hatori, 1973] did not coincide with the observed aftershock...
Estimating population trends with a linear model
Jonathan Bart, Brian D. Collins, R. I. G. Morrison
2003, The Condor (105) 367-372
We describe a simple and robust method for estimating trends in population size. The method may be used with Breeding Bird Survey data, aerial surveys, point counts, or any other program of repeated surveys at permanent locations. Surveys need not be made at each location during each survey period. The...
Influence of transitional volcanic strata on lateral diversion at Yucca Mountain, Nevada
Lorraine E. Flint, Alan L. Flint, John S. Selker
2003, Water Resources Research (39) 4-1-4-17
Natural hydraulic barriers exist at Yucca Mountain, Nevada, a potential high‐level nuclear waste repository, that have been identified as possible lateral diversions for reducing deep percolation through the waste storage area. Historical development of the conceptual model of lateral diversion has been limited by available field data, but numerical investigations...
MODFLOW 2000 Head Uncertainty, a First-Order Second Moment Method
H.S. Glasgow, M.D. Fortney, J. Lee, A.J. Graettinger, H. W. Reeves
2003, Ground Water (41) 342-350
A computationally efficient method to estimate the variance and covariance in piezometric head results computed through MODFLOW 2000 using a first-order second moment (FOSM) approach is presented. This methodology employs a first-order Taylor series expansion to combine model sensitivity with uncertainty in geologic data. MODFLOW 2000 is used to calculate...
Inorganic nitrogen transformations in the bed of the Shingobee River, Minnesota: Integrating hydrologic and biological processes using sediment perfusion cores
R.W. Sheibley, J.H. Duff, A. P. Jackman, F.J. Triska
2003, Limnology and Oceanography (48) 1129-1140
Inorganic N transformations were examined in streambed sediments from the Shingobee River using sediment perfusion cores. The experimental design simulated groundwater-stream water mixing within sediment cores, which provided a well-defined one-dimensional representation of in situ hydrologic conditions. Two distinct hydrologic and chemical settings were preserved in the sediment cores: the...
Density of the continental roots: Compositional and thermal contributions
M.K. Kaban, P. Schwintzer, I.M. Artemieva, Walter D. Mooney
2003, Earth and Planetary Science Letters (209) 53-69
The origin and evolution of cratonic roots has been debated for many years. Precambrian cratons are underlain by cold lithospheric roots that are chemically depleted. Thermal and petrologic data indicate that Archean roots are colder and more chemically depleted than Proterozoic roots. This observation has led to the hypothesis that...
Comparison of approaches for simulating reactive solute transport involving organic degradation reactions by multiple terminal electron acceptors
Gary P. Curtis
2003, Computers & Geosciences (29) 319-329
Reactive solute transport models are useful tools for analyzing complex geochemical behavior resulting from biodegradation of organic compounds by multiple terminal electron acceptors (TEAPs). The usual approach of simulating the reactions of multiple TEAPs by an irreversible Monod rate law was compared with simulations that assumed a partial local equilibrium...
Shallow-velocity models at the Kilauea Volcano, Hawaii, determined from array analyses of tremor wavefields
G. Saccorotti, B. Chouet, P. Dawson
2003, Geophysical Journal International (152) 633-648
The properties of the surface wavefield at Kilauea Volcano are analysed using data from small-aperture arrays of short-period seismometers deployed in and around the Kilauea caldera. Tremor recordings were obtained during two Japan-US cooperative experiments conducted in 1996 and 1997. The seismometers were deployed in three semi-circular arrays with apertures...
Optical dating of tufa via in situ aeolian sand grains: A case example from the Southern High Plains, USA
J. Rich, S. Stokes, W. Wood, R. Bailey
2003, Conference Paper, Quaternary Science Reviews
Precipitated carbonates (commonly termed tufas or travertines) maybe of considerable utility for palaeoenvironmental reconstruction. Their potential, however, for such reconstruction is commonly limited by difficulties associated with their absolute age control. Attempts to date such deposits via uranium series techniques have been complicated by their chemically open behaviour. Here we...
Seasonal movement of the Slumgullion landslide determined from global positioning system surveys and field instrumentation, July 1998-March 2002
J. A. Coe, W. L. Ellis, J. W. Godt, W. Z. Savage, J. E. Savage, J. A. Michael, J.D. Kibler, P. S. Powers, D. J. Lidke, S. Debray
2003, Engineering Geology (68) 67-101
Measurements of landslide movement made by global positioning system surveys and extensometers over a 3.5-year period show that the Slumgullion landslide in the San Juan Mountains of southwest Colorado moved throughout the monitoring period, but that daily velocities varied on a seasonal basis. Landslide velocities peaked in the early spring...
