The Mahomet aquifer: A transboundary resource in east-central Illinois
D.R. Larson, E. Mehnert, B.L. Herzog
2003, Conference Paper, Water International
Emerging intrastate transboundary issues focus on use of the Mahomet aquifer, which underlies about fifteen counties and many other political entities in east-central Illinois. This sand and gravel aquifer in the lower part of the buried Mahomet Bedrock Valley ranges between four and fourteen miles wide and from about 50...
Facilitation of survival and growth of Baccharis halimifolia L. by Spartina alterniflora Loisel. In a created Louisiana salt marsh
J. Egerova, C. Edward Proffitt, Steven E. Travis
2003, Wetlands (23) 250-256
Coastal wetland loss is a major environmental issue in the Mississippi Delta region of the southern United States, where grasses such as Spartina alterniflora may play a critical role both as early colonizers on created sites and as facilitators of other marsh grasses and shrubs, particularly at high intertidal elevations. We explored...
Variable near-surface deformation along the Commerce segment of the Commerce geophysical lineament, southeast Missouri to southern Illinois, USA
J. K. Odum, W. J. Stephenson, R. A. Williams
2003, Tectonophysics (368) 155-170
Recent studies have demonstrated a plausible link between surface and near-surface tectonic features and the vertical projection of the Commerce geophysical lineament (CGL). The CGL is a 5- to 10-km-wide zone of basement magnetic and gravity anomalies traceable for more than 600 km, extending from Arkansas through southeast Missouri and...
Geographical distribution of organochlorine pesticides (OCPs) in polar bears (Ursus maritimus) in the Norwegian and Russian Arctic
E. Lie, A. Bernhoft, F. Riget, Stanislav Belikov, Andrei N. Boltunov, A.E. Derocher, G.W. Garner, O. Wiig, J.U. Skaare
2003, Science of the Total Environment (306) 159-170
Geographical variation of organochlorine pesticides (OCPs) was studied in blood samples from 90 adult female polar bear (Ursus maritimus) from Svalbard, Franz Josef Land, Kara Sea, East-Siberian Sea and Chukchi Sea. In all regions, oxychlordane was the dominant OCP. Regional differences in mean levels of HCB, oxychlordane, trans-nonachlor, ??-HCH, ??-HCH...
High-resolution multibeam mapping and submersible surveys of topographic features in the northwestern Gulf of Mexico
E.L. Hickerson, G.P. Schmahl, D.C. Weaver, J.V. Gardner
2003, Conference Paper, Oceans Conference Record (IEEE)
The Flower Garden Banks National Marine Sanctuary (FGBNMS) and the USGS Pacific Seafloor Mapping Project mapped about 2000 km2 of the northwestern Gulf of Mexico continental shelf during June 2002, using a Kongsberg Simrad EM1000 multibeam echosounder. Mapping focused on select topographic highs thave hae been idetnnfied as biological features...
Late Holocene estuarine-inner shelf interactions; is there evidence of an estuarine retreat path for Tampa Bay, Florida?
B.T. Donahue, A. C. Hine, S. Tebbens, S. D. Locker, D.C. Twichell
2003, Marine Geology (200) 219-241
The purpose of this study was to determine if and how a large, modern estuarine system, situated in the middle of an ancient carbonate platform, has affected its adjacent inner shelf both in the past during the last, post-glacial sea-level rise and during the present. An additional purpose was to...
Difficulties in determining factors that influence effective groundwater recharge in Ohio
J. Ashooh, J. Liu, E. Mueller, S. Sherer, N. Woggon, D.H. Dumouchelle, M. Eberle
2003, Ohio Journal of Science (103) 67-68
As part of a COSI Academy research project, data from a recent statewide analysis of effective groundwater recharge were reexamined by students to further discern relations between recharge and selected environmental characteristics of individual drainage basins: 1) location of the main stem of a river relative to coarse and fine...
Effect of different sampling schemes on the spatial placement of conservation reserves in Utah, USA
S.D. Bassett, T.C. Edwards Jr.
2003, Biological Conservation (113) 141-151
We evaluated the effect of three different sampling schemes used to organize spatially explicit biological information had on the spatial placement of conservation reserves in Utah, USA. The three sampling schemes consisted of a hexagon representation developed by the EPA/EMAP program (statistical basis), watershed boundaries (ecological), and the current county...
Using fecal glucocorticoids for stress assessment in Mourning Doves
Brian E. Washburn, Joshua J. Millspaugh, John H. Schulz, Susan B. Jones, T. Mong
2003, Condor (105) 696-706
Fecal glucocorticoid assays provide a potentially useful, noninvasive means to study physiological responses of wildlife to various stressors. The objective of our study was to validate a method for measuring glucocorticoid metabolites in Mourning Dove (Zenaida macroura) feces. We validated the assay using standard procedures (e.g., parallelism, recovery of exogenous...
Intrastab Earthquakes: Dehydration of the Cascadia Slab
L.A. Preston, K. C. Creager, R. S. Crosson, T.M. Brocher, A.M. Trehu
2003, Science (302) 1197-1200
We simultaneously invert travel times of refracted and wide-angle reflected waves for three-dimensional compressional-wave velocity structure, earthquake locations, and reflector geometry in northwest Washington state. The reflector, interpreted to be the crust-mantle boundary (Moho) of the subducting Juan de Fuca plate, separates intrastab earthquakes into two groups, permitting a new...
Effects of ration level on immune functions in chinook salmon (Oncorhynchus tshawytscha)
S.W. Alcorn, R.J. Pascho, A.L. Murray, K.D. Shearer
2003, Aquaculture (217) 529-545
The relationship between nutritional status and disease resistance in cultured salmonids can be affected by dietary manipulations. Careful attention to feeding levels may be important to avoid imbalances in nutrient levels that could ultimately impair a fish's ability to resist infectious microorganisms. In the current study, fish in three feed-level...
A special issue devoted to gold deposits in Northern Nevada: Part 1. Regional studies and epitherrmal deposits
D. A. John, A. H. Hofstra, T. G. Theodore
2003, Economic Geology (98) 225-234
No abstract available....
Comparison of electrofishing and rotenone for sampling largemouth bass in vegetated areas of two Florida lakes
W.B. Tate, M. S. Allen, R.A. Myers, J.R. Estes
2003, North American Journal of Fisheries Management (23) 181-188
We compared the sampling precision and efficiency of electrofishing and rotenone for assessing populations of largemouth bass Micropterus salmoides in vegetated portions of two Florida lakes. Sampling was conducted at Lochloosa and Orange lakes in north-central Florida from 1990 to 1999. Significant differences in length frequencies were determined between the...
Geothermometry, geochronology, and mass transfer associated with hydrothermal alteration of a rhyolitic hyaloclastite from Ponza Island, Italy
S. P. Altaner, R.F. Ylagan, S.M. Savin, J.L. Aronson, H. E. Belkin, A. Pozzuoli
2003, Geochimica et Cosmochimica Acta (67) 275-288
A rhyolitic hyaloclastite from Ponza Island, Italy, was hydrothermally altered, producing four distinct alteration zones based on X-ray diffraction mineralogy and field textures: (1) nonpervasive argillic zone; (2) propylitic zone; (3) silicic zone; and (4) sericitic zone. The unaltered hyaloclastite is volcanic breccia with clasts of vesiculated obsidian in a...
The behavior of U- and Th-series nuclides in groundwater
D. Porcelli, P.W. Swarzenski
2003, Reviews in Mineralogy and Geochemistry (52)
[No abstract available]...
The early Mesozoic Birdsboro central Atlantic margin basin in the Mid-Atlantic region, eastern United States
R. T. Faill
2003, Geological Society of America Bulletin (115) 406-421
The early Mesozoic Birdsboro basin (new name) was a single, elongate depositional trough in the present Mid-Atlantic area of the eastern United States, extending north-eastward from central Virginia across Maryland, Pennsylvania, and New Jersey into southern New York. What now remains after erosion comprises the Barboursville, Culpeper, Gettysburg, and Newark...
Managing a subsidized predator population: Reducing common raven predation on desert tortoises
W.I. Boarman
2003, Environmental Management (32) 205-217
Human communities often are an inadvertent source of food, water, and other resources to native species of wildlife. Because these resources are more stable and predictable than those in a natural environment, animals that subsist on them are able to increase in numbers and expand their range, much to the...
Effects of desert wildfires on desert tortoise (Gopherus agassizii) and other small vertebrates
T. C. Esque, C.R. Schwalbe, L.A. DeFalco, R.B. Duncan, T.J. Hughes
2003, Southwestern Naturalist (48) 103-111
We report the results of standardized surveys to determine the effects of wildfires on desert tortoises (Gopherus agassizii) and their habitats in the northeastern Mojave Desert and northeastern Sonoran Desert. Portions of 6 burned areas (118 to 1,750 ha) were examined for signs of mortality of vertebrates. Direct effects of...
Application of two hydrologic models with different runoff mechanisms to a hillslope dominated watershed in the northeastern US: A comparison of HSPF and SMR
M.S. Johnson, W.F. Coon, V.K. Mehta, T.S. Steenhuis, E.S. Brooks, J. Boll
2003, Journal of Hydrology (284) 57-76
Differences in the simulation of hydrologic processes by watershed models directly affect the accuracy of results. Surface runoff generation can be simulated as either: (1) infiltration-excess (or Hortonian) overland flow, or (2) saturation-excess overland flow. This study compared the Hydrological Simulation Program - FORTRAN (HSPF) and the Soil Moisture Routing...
Paleolimnology of Lake Tanganyika, East Africa, over the past 100 k yr
C.A. Scholz, J.W. King, G.S. Ellis, Peter K. Swart, J.C. Stager, Steven M. Colman
2003, Conference Paper, Journal of Paleolimnology
New sediment core data from a unique slow-sedimentation rate site in Lake Tanganyika contain a much longer and continuous record of limnological response to climate change than have been previously observed in equatorial regions of central Africa. The new core site was first located through an extensive seismic reflection survey...
On the preservation of laminated sediments along the western margin of North America
A. VanGeen, Yen Zheng, J.M. Bernhard, K.G. Cannariato, J. Carriquiry, W.E. Dean, B.W. Eakins, J.D. Ortiz, J. Pike
2003, Paleoceanography (18) 22-1
Piston, gravity, and multicores as well as hydrographic data were collected along the Pacific margin of Baja California to reconstruct past variations in the intensity of the oxygen-minimum zone (OMZ). Gravity cores collected from within the OMZ north of 24??N did not contain laminated surface sediments even though bottom water...
Earthquake occurrence modeling for evaluating seismic risks to roadway systems
D. Perkins, C. Taylor
Beavers J.E., editor(s)
2003, Conference Paper, Technical Council on Lifeline Earthquake Engineering Monograph
The results of the application of a variety of techniques, which included bootstrap sampling, the use of antithetic values, the use of Latin squares sampling, use of control functions, a compound Poisson approach, and importance sampling, were presented. It was found that extremely large reductions in the number of simulations...
Evaluating tsunami hazards from debris flows
P. Watts, J. S. Walder
Rickenmann D.Chen C.L., editor(s)
2003, Conference Paper, International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings
Debris flows that enter water bodies may have significant kinetic energy, some of which is transferred to water motion or waves that can impact shorelines and structures. The associated hazards depend on the location of the affected area relative to the point at which the debris flow enters the water....
Simulation of ground motion using the stochastic method
D.M. Boore
2003, Pure and Applied Geophysics (160) 635-676
A simple and powerful method for simulating ground motions is to combine parametric or functional descriptions of the ground motion's amplitude spectrum with a random phase spectrum modified such that the motion is distributed over a duration related to the earthquake magnitude and to the distance from the source. This...
Distributional comments on some members of the herpetofauna of the Mosquitia, Honduras
L.D. Wilson, J.R. McCranie, S. Gotte, J.H. Townsend
2003, Herpetological Bulletin 15-19
[No abstract available]...
