Characterization and copper binding of humic and nonhumic organic matter isolated from the South Platte River: Evidence for the presence of nitrogenous binding site
J.-P. Croue, M.F. Benedetti, D. Violleau, J.A. Leenheer
2003, Environmental Science & Technology (37) 328-336
Humic substances typically constitute 40−60% of the dissolved organic matter (DOM) in surface waters. However, little information is available regarding the metal binding properties of the nonhumic hydrophilic portion of the DOM. In this study, humic and nonhumic DOM samples were isolated from the South Platte River...
Fault systems of the 1971 San Fernando and 1994 Northridge earthquakes, southern California: Relocated aftershocks and seismic images from LARSE II
G. S. Fuis, R.W. Clayton, P.M. Davis, T. Ryberg, W. J. Lutter, D. A. Okaya, E. Hauksson, C. Prodehl, J.M. Murphy, M.L. Benthien, S.A. Baher, M.D. Kohler, K. Thygesen, G. Simila, Gordon R. Keller
2003, Geology (31) 171-174
We have constructed a composite image of the fault systems of the M 6.7 San Fernando (1971) and Northridge (1994), California, earthquakes, using industry reflection and oil test well data in the upper few kilometers of the crust, relocated aftershocks in the seismogenic crust, and LARSE II (Los Angeles Region...
The 1997 eruption of Okmok Volcano, Alaska: A synthesis of remotely sensed imagery
M.R. Patrick, J. Dehn, K.R. Papp, Z. Lu, K. Dean, L. Moxey, P. Izbekov, R. Guritz
2003, Journal of Volcanology and Geothermal Research (127) 87-105
Okmok Volcano, in the eastern Aleutian Islands, erupted in February and March of 1997 producing a 6-km-long lava flow and low-level ash plumes. This caldera is one of the most active in the Aleutian Arc, and is now the focus of international multidisciplinary studies. A synthesis of remotely sensed data...
Mapping Shoreline Change Using Digital Orthophotogrammetry on Maui, Hawaii
C. Fletcher, J. Rooney, M. Barbee, S.-C. Lim, B. Richmond
2003, Conference Paper, Journal of Coastal Research
Digital, aerial orthophotomosaics with 0.5-3.0 m horizontal accuracy, used with NOAA topographic maps (T-sheets), document past shoreline positions on Maui Island, Hawaii. Outliers in the shoreline position database are determined using a least median of squares regression. Least squares linear regression of the reweighted data (outliers excluded) is used to...
Paleomagnetism and geochronology of an Early Proterozoic quartz diorite in the southern Wind River Range, Wyoming, USA
S. S. Harlan, J.W. Geisman, W. R. Premo
2003, Tectonophysics (362) 105-122
We present geochronologic and paleomagnetic data from a north-trending quartz diorite intrusion that cuts Archean metasedimentary and metaigneous rocks of the South Pass Greenstone Belt of the Wyoming craton. The quartz diorite was previously thought to be either Archean or Early Proterozoic (?) in age and is cut by north...
Rheology of the lithosphere inferred from postseismic uplift following the 1959 Hebgen Lake earthquake
T. Nishimura, W. Thatcher
2003, Journal of Geophysical Research B: Solid Earth (108)
We have modeled the broad postseismic uplift measured by geodetic leveling in the epicentral area of the 1959 Mw = 7.3 Hebgen Lake, Montana earthquake, a normal faulting event in the northern Basin and Range province. To fit the observed uplift we calculate synthetic postseismic deformation using the relaxation response...
Volcano seismology
B. Chouet
2003, Pure and Applied Geophysics (160) 739-788
A fundamental goal of volcano seismology is to understand active magmatic systems, to characterize the configuration of such systems, and to determine the extent and evolution of source regions of magmatic energy. Such understanding is critical to our assessment of eruptive behavior and its hazardous impacts. With the emergence of...
Wolf population dynamics
Todd K. Fuller, L. David Mech, Jean Fitts Cochrane
L. David Mech, Luigi Boitani, editor(s)
2003, Book chapter, Wolves: Behavior, ecology, and conservation
A large, dark wolf poked his nose out of the pines in Yellowstone National Park as he thrust a broad foot deep into the snow and plowed ahead. Soon a second animal appeared, then another, and a fourth. A few minutes later, a pack of thirteen lanky wolves had filed...
Living with a large reduction in permited loading by using a hydrograph-controlled release scheme
P.A. Conrads, W.P. Martello, N.R. Sullins
2003, Environmental Monitoring and Assessment (81) 97-106
The Total Maximum Daily Load (TMDL) for ammonia and biochemical oxygen demand for the Pee Dee, Waccamaw, and Atlantic Intracoastal Waterway system near Myrtle Beach, South Carolina, mandated a 60-percent reduction in point-source loading. For waters with a naturally low background dissolved-oxygen concentrations, South Carolina anti-degradation rules in the water-quality...
Hydrostratigraphic modeling of a complex, glacial-drift aquifer system for importation into MODFLOW
B.L. Herzog, D.R. Larson, C.C. Abert, S.D. Wilson, G.S. Roadcap
2003, Ground Water (41) 57-65
Deposition from at least three episodes of glaciation left a complex glacial-drift aquifer system in central Illinois. The deepest and largest of these aquifers, the Sankoty-Mahomet Aquifer, occupies the lower part of a buried bedrock valley and supplies water to communities throughout central Illinois. Thin, discontinuous aquifers are present within...
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...
Predicting changes in hydrologic retention in an evolving semi-arid alluvial stream
J. W. Harvey, M.H. Conklin, R.S. Koelsch
2003, Advances in Water Resources (26) 939-950
Hydrologic retention of solutes in hyporheic zones or other slowly moving waters of natural channels is thought to be a significant control on biogeochemical cycling and ecology of streams. To learn more about factors affecting hydrologic retention, we repeated stream-tracer injections for 5 years...
Genetic assessment of strain-specific sources of lake trout recruitment in the Great Lakes
Kevin S. Page, Kim T. Scribner, Kristine R. Bennett, Laura M. Garzel, Mary K. Burnham-Curtis
2003, Transactions of the American Fisheries Society (132) 877-894
Populations of wild lake trout Salvelinus namaycush have been extirpated from nearly all their historical habitats across the Great Lakes. Efforts to restore self-sustaining lake trout populations in U.S. waters have emphasized the stocking of coded-wire-tagged juveniles from six hatchery strains (Seneca Lake, Lewis Lake, Green Lake, Apostle Islands, Isle Royale, and...
Sea lamprey (Petromyzon marinus) parasite-host interactions in the Great Lakes
James R. Bence, Roger A. Bergstedt, Gavin C. Christie, Phillip A. Cochran, Mark P. Ebener, Joseph F. Koonce, Michael A. Rutter, William D. Swink
2003, Journal of Great Lakes Research (29) 253-282
Prediction of how host mortality responds to efforts to control sea lampreys (Petromyzon marinus) is central to the integrated management strategy for sea lamprey (IMSL) in the Great Lakes. A parasite-host submodel is used as part of this strategy, and this includes a type-2 multi-species functional response, a developmental response,...
Native weeds and exotic plants: Relationships to disturbance in mixed-grass prairie
D.L. Larson
2003, Plant Ecology (169) 317-333
Disturbance frequently is implicated in the spread of invasive exotic plants. Disturbances may be broadly categorized as endogenous (e.g., digging by fossorial animals) or exogenous (e.g., construction and maintenance of roads and trails), just as weedy species may be native or exotic in origin. The objective of this study was...
Simulation of unsteady flow and solute transport in a tidal river network
X. Zhan
2003, Engineering Computations (Swansea, Wales) (20) 754-767
A mathematical model and numerical method for water flow and solute transport in a tidal river network is presented. The tidal river network is defined as a system of open channels of rivers with junctions and cross sections. As an example, the Pearl River in China is represented by a...
The distribution of meteoric 36Cl/Cl in the United States: A comparison of models
S. Moysey, S.N. Davis, M. Zreda, L.D. Cecil
2003, Hydrogeology Journal (11) 615-627
The natural distribution of 36Cl/Cl in groundwater across the continental United States has recently been reported by Davis et al. (2003). In this paper, the large-scale processes and atmospheric sources of 36Cl and chloride responsible for controlling the observed 36Cl/Cl distribution are discussed. The dominant process that affects 36Cl/Cl in...
An enhanced cluster analysis program with bootstrap significance testing for ecological community analysis
J.E. McKenna Jr.
2003, Environmental Modelling and Software (18) 205-220
The biosphere is filled with complex living patterns and important questions about biodiversity and community and ecosystem ecology are concerned with structure and function of multispecies systems that are responsible for those patterns. Cluster analysis identifies discrete groups within multivariate data and is an effective method of coping with...
Erosion of an ancient mountain range, the Great Smoky Mountains, North Carolina and Tennessee
A. Matmon, P.R. Bierman, J. Larsen, S. Southworth, M. Pavich, R. Finkel, M. Caffee
2003, American Journal of Science (303) 817-855
Analysis of 10Be and 26Al in bedrock (n=10), colluvium (n=5 including grain size splits), and alluvial sediments (n=59 including grain size splits), coupled with field observations and GIS analysis, suggest that erosion rates in the Great Smoky Mountains are controlled by subsurface bedrock erosion and diffusive slope processes. The results indicate...
Icelandic-type crust
G.R. Foulger, Z. Du, B.R. Julian
2003, Geophysical Journal International (155) 567-590
Numerous seismic studies, in particular using receiver functions and explosion seismology, have provided a detailed picture of the structure and thickness of the crust beneath the Iceland transverse ridge. We review the results and propose a structural model that is consistent with all the observations. The upper crust is typically...
An index of biological integrity (IBI) for Pacific Northwest rivers
C.A. Mebane, T.R. Maret, R. M. Hughes
2003, Transactions of the American Fisheries Society (132) 239-261
The index of biotic integrity (IBI) is a commonly used measure of relative aquatic ecosystem condition; however, its application to coldwater rivers over large geographic areas has been limited. A seven-step process was used to construct and test an IBI applicable to fish assemblages in coldwater rivers throughout the U.S....
Environmental fate and effects of the lampricide TFM: A review
T.D. Hubert
2003, Conference Paper, Journal of Great Lakes Research
Use of 3-trifluoromethyl-4-nitrophenol (TFM) is limited geographically to the Great Lakes basin where it is the principal agent used in control of the sea lamprey (Petromyzon marinus). It is clear from available data that TFM has effects on the environment, but the effects reported are transient. Individual organisms and aquatic...
Two-dimensional inverse and three-dimensional forward modeling of MT (magnetotelluric) data to evaluate the mineral potential of the Amphitheater Mountains, Alaska, USA
Louise Pellerin, Jeanine M. Schmidt, G. Michael Hoversten
2003, Conference Paper, Proceedings of the 3DEM-3 symposium: Three dimensional electromagnetics III: ASEG Special Publications 2003(1)
As part of an integrated geological and geophysical study to assess the mineral potential in the Amphitheater Mountains of south-central Alaska, USA, two magnetotelluric (MT) profiles were acquired during the summer of 2002. The two parallel MT lines, along with helicopter electromagnetic (HEM) and magnetic data acquired by the State...
Effects of channel modification on fish habitat in the upper Yellowstone River: Final report to the USACE, Omaha
Zachary H. Bowen, Ken D. Bovee, Terry J. Waddle
2003, Open-File Report 2003-476
A two-dimensional hydrodynamic simulation model was coupled with a geographic information system (GIS) to produce a variety of habitat classification maps for three study reaches in the upper Yellowstone River basin in Montana. Data from these maps were used to examine potential effects of channel modification on shallow, slow current...
Evaluation of the eastern (Centrocercus urophasianus urophasianus) and western (Centrocercus urophasianus phaios) subspecies of Sage-grouse using mitochondrial control-region sequence data
N.G. Benedict, S.J. Oyler-McCance, S.E. Taylor, C.E. Braun
2003, Conservation Genetics (4) 301-310
The status of Sage-grouse (Centrocercus urophasianus) is of increasing concern, as populations throughout its range have contracted as a result of habitat loss and degradation. Historically, Sage-grouse were classified into two subspecies: eastern(C. u. urophasianus) and western Sage-grouse (C. u. phaios) based on slight...
