Transport and fate of organic wastes in groundwater at the Stringfellow hazardous waste disposal site, southern California
J.A. Leenheer, J. Hsu, L. B. Barber
2001, Journal of Contaminant Hydrology (51) 163-178
In January 1999, wastewater influent and effluent from the pretreatment plant at the Stringfellow hazardous waste disposal site were sampled along with groundwater at six locations along the groundwater contaminant plume. The objectives of this sampling and study were to identify at the compound class level the unidentified 40–60% of wastewater organic contaminants, and to determine...
Estimating repeatability of egg size
Paul L. Flint, R.F. Rockwell, J.S. Sedinger
2001, The Auk (118) 500-503
Measures of repeatability have long been used to assess patterns of variation in egg size within and among females. We compared different analytical approaches for estimating repeatability of egg size of Black Brant. Separate estimates of repeatability for eggs of each clutch size and laying sequence number varied from 0.49...
Evaluation of commercially prepared transport systems for nonlethal detection of Aeromonas salmonicida in salmonid fish
R. C. Cipriano, G. L. Bullock
2001, Journal of Aquatic Animal Health (13) 96-104
In vitro studies indicated that commercially prepared transport systems containing Amies, Stuart's, and Cary-Blair media worked equally well in sustaining the viability of the fish pathogen Aeromonas salmonicida, which causes furunculosis. The bacterium remained viable without significant increase or decrease in cell numbers for as long as 48 h of...
Selection of habitats by Emperor Geese during brood rearing
Joel A. Schmutz
2001, Waterbirds (24) 394-401
Although forage quality strongly affects gosling growth and consequently juvenile survival, the relative use of different plant communities by brood rearing geese has been poorly studied. On the Yukon-Kuskokwim Delta, Alaska, population growth and juvenile recruitment of Emperor Geese (Chen canagica) are comparatively low, and it is unknown whether their...
Correlation of ground motion and intensity for the 17 January 1994 Northridge, California, earthquake
J. Boatwright, K. Thywissen, L. C. Seekins
2001, Bulletin of the Seismological Society of America (91) 739-752
We analyze the correlations between intensity and a set of groundmotion parameters obtained from 66 free-field stations in Los Angeles County that recorded the 1994 Northridge earthquake. We use the tagging intensities from Thywissen and Boatwright (1998) because these intensities are determined independently on census tracts, rather than interpolated from...
Catchment-scale variation in the nitrate concentrations of groundwater seeps in the Catskill Mountains, New York, U.S.A.
A.J. West, S.E.G. Findlay, Douglas A. Burns, K.C. Weathers, Gary M. Lovett
2001, Water, Air, & Soil Pollution (132) 389-400
Forested headwater streams in the Catskill Mountains of New York show significant among-catchment variability in mean annual nitrate (NO3-) concentrations. Large contributions from deep groundwater with high NO3- concentrations have been invoked to explain high NO3- concentrations in stream water during the growing season. To determine whether variable contributions of...
Mineralogy of the last lunar basalts: Results from Clementine
M.I. Staid, C.M. Pieters
2001, Journal of Geophysical Research E: Planets (106) 27887-27900
The last major phase of lunar volcanism produced extensive high-titanium mare deposits on the western nearside which remain unsampled by landing missions. The visible and near-infrared reflectance properties of these basalts are examined using Clementine multispectral images to better constrain their mineralogy. A much stronger 1 μm ferrous absorption was...
The Ordovician Sebree Trough: An oceanic passage to the Midcontinent United States
Dennis R. Kolata, W.D. Huff, Stig M. Bergstrom
2001, Geological Society of America Bulletin (113) 1067-1078
The Sebree Trough is a relatively narrow, shale-filled sedimentary feature extending for several hundred kilometers across the Middle and Late Ordovician carbonate platform of the Midcontinent United States. The dark graptolitic shales within the trough stand in contrast to the coeval bryozoan-brachiopod-echinoderm– rich limestones on the flanking platforms. We infer...
Effect of natural gas exsolution on specific storage in a confined aquifer undergoing water level decline
R. M. Yager, J.C. Fountain
2001, Ground Water (39) 517-525
The specific storage of a porous medium, a function of the compressibility of the aquifer material and the fluid within it, is essentially constant under normal hydrologic conditions. Gases dissolved in ground water can increase the effective specific storage of a confined aquifer, however, during water level declines. This causes...
Enantiomeric composition of chiral polychlorinated biphenyl atropisomers in aquatic and riparian biota
C.S. Wong, A.W. Garrison, P.D. Smith, W.T. Foreman
2001, Environmental Science & Technology (35) 2448-2454
The enantiomeric composition of polychlorinated biphenyl (PCB) atropisomers was measured in river and riparian biota (fish, bivalves, crayfish, water snakes, barn swallows) from selected sites throughout the United States by using chiral gas chromatography/mass spectrometry. Nonracemic enantiomeric fractions (EFs) were observed for PCBs 91, 95, 136, and 149 for aquatic...
Andrei borisovich vistelius: A dominant figure in 20th century mathematical geology
D. F. Merriam
2001, Natural Resources Research (10) 297-304
Andrei Borisovich Vistelius (1915-1995), along with William Christian Krumbein (1902-1979) and John Cedric Griffiths (1912-1992), were dominant figures in the formative and development years of mathematical (or quantitative) geology as a subdiscipline of geology....
Production of stream habitat gradients by montane watersheds: Hypothesis tests based on spatially explicit path analyses
D.J. Isaak, W.A. Hubert
2001, Canadian Journal of Fisheries and Aquatic Sciences (58) 1089-1103
We studied how the features of mountain watersheds interact to cause gradients in three stream attributes: baseflow stream widths, total alkalinity, and stream slope. A priori hypotheses were developed before being tested in a series of path analyses using data from 90 stream reaches on 24 second- to fourth-order streams...
Backcountry water quality in Grand Teton National Park
N. Tippets, S. O'Ney, A.M. Farag
2001, Park Science (21) 25-27
Over the past several decades, visitor use of the backcountry areas of Grand Teton National Park (Wyoming) has dramatically increased. The water quality of clear, sparkling mountain streams and lakes is being impacted by concentrated recreational use where, because of the potential for future wilderness designation, no restroom facilities are...
Radiocarbon dating of dissolved inorganic carbon in groundwater from confined parts of the Upper Floridan aquifer, Florida, USA
Niel Plummer, C.L. Sprinkle
2001, Hydrogeology Journal (9) 127-150
Geochemical reaction models were evaluated to improve radiocarbon dating of dissolved inorganic carbon (DIC) in groundwater from confined parts of the Upper Floridan aquifer in central and northeastern Florida, USA. The predominant geochemical reactions affecting the 14C activity of DIC include (1) dissolution of dolomite and anhydrite with calcite precipitation...
Late Quaternary vegetation history of Rough Canyon, south-central New Mexico, USA
J.L. Betancourt, Kate Aasen Rylander, C. Penalba, J.L. McVickar
2001, Palaeogeography, Palaeoclimatology, Palaeoecology (165) 71-95
South-central New Mexico, USA, at the junction of the Rocky Mountains, High Plains and Chihuahuan Desert, is one of the better known regions in the late Quaternary of North America. Plant macrofossils and pollen from a packrat midden series in Rough Canyon, New Mexico allows refinement of plant distributions and...
Interactive visualization of vegetation dynamics
B. C. Reed, D. Swets, L. Bard, J. Brown, James Rowland
2001, Conference Paper, International Geoscience and Remote Sensing Symposium (IGARSS)
Satellite imagery provides a mechanism for observing seasonal dynamics of the landscape that have implications for near real-time monitoring of agriculture, forest, and range resources. This study illustrates a technique for visualizing timely information on key events during the growing season (e.g., onset, peak, duration, and end of growing season),...
Factors controlling the configuration of the fresh-saline water interface in the Dead Sea coastal aquifers: Synthesis of TDEM surveys and numerical groundwater modeling
Y. Yechieli, U. Kafri, M. Goldman, C.I. Voss
2001, Hydrogeology Journal (9) 367-377
TDEM (time domain electromagnetic) traverses in the Dead Sea (DS) coastal aquifer help to delineate the configuration of the interrelated fresh-water and brine bodies and the interface in between. A good linear correlation exists between the logarithm of TDEM resistivity and the chloride concentration of groundwater, mostly in the higher...
Geoarchaeology at Gilman Falls: An Archaic Quarry and Manufacturing Site in Central Maine, U.S.A
D. Sanger, A.R. Kelley, H. N. Berry IV
2001, Geoarchaeology - An International Journal (16) 633-665
Interdisciplinary investigations at the Milford Reservoir, central Maine, resulted in excavation and analysis of a Middle Archaic quarry and manufacturing site at Gilman Falls, dated to between 7300 and 6300 yr B.P. Lithological analysis indicates that the majority of the artifacts came from very local outcrops, providing low-grade metamorphic rocks....
A lone biodetrital mound in the Chesterian (Carboniferous) of Alabama?
D. C. Kopaska-Merkel, D.W. Haywick
2001, Sedimentary Geology (145) 253-268
A carbonate mound in the Chesterian Bangor Limestone of Lawrence County, Alabama, consists chiefly of packstone and grainstone dominated by echinoderm ossicles and fragments of fenestrate bryozoans. In-situ colonies of the rugose coral Caninia flaccida comprise about 8% of the mound by volume. The exposed portion of the mound is...
2,3,7,8-Tetrachlorodibenzo-p-dioxin induces apoptotic cell death and cytochrome P4501A expression in developing Fundulus heteroclitus embryos
B.H. Toomey, S. Bello, M.E. Hahn, S. Cantrell, P. Wright, D. E. Tillitt, R.T. Di Giulio
2001, Aquatic Toxicology (53) 127-138
Fundulus heteroclitus embryos were exposed to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) during early development using nanoinjection or water bath exposure. TCDD caused developmental abnormalities that included hemorrhaging, loss of vascular integrity, edema, stunted development and death. The LC50 and LD50 of TCDD for Fundulus embryos were ???19.7??9.5 pg TCDD/??l (water bath) and 0.25??0.09...
Biodegradation of MTBE by indigenous aquifer microorganisms under artificial oxic conditions
J. E. Landmeyer, P. M. Bradley
2001, Conference Paper, ACS National Meeting Book of Abstracts
Oxygen in the form of a metal peroxide slurry (MgO2 and water) was added to an anoxic part of a gasoline-contaminated aquifer in South Carolina to test the hypothesis that artificial oxic conditions will lead to MTBE biodegradation by indigenous microorganisms in anoxic, gasoline-contaminated aquifers. The slurry slowly released dissolved...
Working in the Pacific
J. I. Tracey Jr.
2001, Atoll Research Bulletin 11-22
[No abstract available]...
Oxytetracycline depletion from skin-on fillet tissue of coho salmon fed oxytetracycline medicated feed in freshwater at temperatures less than 9°C
Jeffery R. Meinertz, Mark P. Gaikowski, Guy R. Stehly, William H. Gingerich, Joy A. Evered
2001, Aquaculture (198) 29-39
Oxytetracycline (OTC) is a broad spectrum antibacterial agent approved in the USA for treating certain bacterial diseases in salmonids cultured in freshwater at temperatures greater than or equal to 9°C. This study was conducted to provide the information necessary to expand the OTC label to include treatment of diseased salmonids...
Three-parameter AVO crossplotting in anisotropic media
Chen Hao, J.P. Castagna, R.L. Brown, A.C.B. Ramos
2001, Geophysics (66) 1359-1363
Amplitude versus offset (AVO) interpretation can be facilitated by crossplotting AVO intercept (A), gradient (B), and curvature (C) terms. However, anisotropy, which exists in the real world, usually complicates AVO analysis. Recognizing anisotropic behavior on AVO crossplots can help avoid AVO interpretation errors.Using a modification to a three-term (A, B, and C)...
Stress drop with constant, scale independent seismic efficiency and overshoot
N.M. Beeler
2001, Geophysical Research Letters (28) 3353-3356
To model dissipated and radiated energy during earthquake stress drop, I calculate dynamic fault slip using a single degree of freedom spring-slider block and a laboratory-based static/kinetic fault strength relation with a dynamic stress drop proportional to effective normal stress. The model is scaled to earthquake size assuming a circular...
