Aquifer/aquitard interfaces: Mixing zones that enhance biogeochemical reactions
P.B. McMahon
2001, Hydrogeology Journal (9) 34-43
Several important biogeochemical reactions are known to occur near the interface between aquifer and aquitard sediments. These reactions include O2 reduction; denitrification; and Fe3+, SO42-, and CO2 (methanogenesis) reduction. In some settings, these reactions occur on the aquitard side of the interface as electron acceptors move from the aquifer into...
Transport processes near coastal ocean outfalls
M.A. Noble, C. R. Sherwood, Hooi-Ling Lee, J. Xu, P. Dartnell, G. Robertson, M. Martini
2001, Conference Paper, Oceans Conference Record (IEEE)
The central Southern California Bight is an urbanized coastal ocean where complex topography and largescale atmospheric and oceanographic forcing has led to numerous sediment-distribution patterns. Two large embayments, Santa Monica and San Pedro Bays, are connected by the short, very narrow shelf off the Palos Verdes peninsula. Ocean-sewage outfalls are...
Plant-uptake of uranium: Hydroponic and soil system studies
A. Ramaswami, P. Carr, M. Burkhardt
2001, International Journal of Phytoremediation (3) 189-201
Limited information is available on screening and selection of terrestrial plants for uptake and translocation of uranium from soil. This article evaluates the removal of uranium from water and soil by selected plants, comparing plant performance in hydroponic systems with that in two soil systems (a sandy-loam soil and an...
Observations of Daily Temperature Patterns in the Southern Florida Everglades
R.W. Schaffranek, H. L. Jenter
Hayes D.F.Hayes D.F., editor(s)
2001, Conference Paper, Proceedings of the 2001 Wetlands Engineering and River Restoration Conference
Temperature is an important factor affecting key hydrological and ecological processes within the subtropical wetlands of the Florida Everglades. Comprehensive measurements are being made to quantify the temporal and spatial variability of the water-temperature regime. Data collected in 2000 at a location near the central flow pathway of the ecosystem...
Finding disease-carrying mosquitoes from space
S.C. Guptill
2001, Geotimes (46) 26-27
[No abstract available]...
1857 slip on the San Andreas fault Southeast of Cholame, California
J. J. Lienkaemper
2001, Bulletin of the Seismological Society of America (91) 1659-1672
Sieh and Jahns (1984) forecasted that the next moderate Parkfield earthquake might trigger a major earthquake along a fault segment greater than 30 km long southeast of Cholame. Their forecast assumed (1) the slip was 3-4 m in 1857 and characteristic of the segment; (2) a slip rate of 3.4...
Mississippi Valley-type lead-zinc deposits through geological time: Implications from recent age-dating research
D. L. Leach, D. Bradley, Michael T. Lewchuk, David T. A. Symons, G. De Marsily, J. Brannon
2001, Mineralium Deposita (36) 711-740
Remarkable advances in age dating Mississippi Valley-type (MVT) lead-zinc deposits provide a new opportunity to understand how and where these deposits form in the Earth's crust. These dates are summarized and examined in a framework of global tectonics, paleogeography, fluid migration, and paleoclimate. Nineteen districts have been dated by paleomagnetic...
Predictions of sediment toxicity using consensus-based freshwater sediment quality guidelines
C.G. Ingersoll, D.D. MacDonald, N. Wang, J.L. Crane, L.J. Field, P.S. Haverland, N.E. Kemble, R.A. Lindskoog, C. Severn, D.E. Smorong
2001, Archives of Environmental Contamination and Toxicology (41) 8-21
The objectives of this study were to compare approaches for evaluating the combined effects of chemical mixtures on the toxicity in field-collected sediments and to evaluate the ability of consensus-based probable effect concentrations (PECs) to predict toxicity in a freshwater database on both a national and regional geographic basis. A...
Contaminant sensitivity of threatened and endangered fishes compared to standard surrogate species
L.C. Sappington, F.L. Mayer, F.J. Dwyer, D.R. Buckler, J.R. Jones, Mark R. Ellersieck
2001, Environmental Toxicology and Chemistry (20) 2869-2876
Standard environmental assessment procedures are designed to protect terrestrial and aquatic species. However, it is not known if endangered species are adequately protected by these procedures. At present, toxicological data obtained from studies with surrogate test fishes are assumed to be applicable to endangered fish species, but this assumption has...
Ancient drainage basin of the Tharsis region, Mars: Potential source for outflow channel systems and putative oceans or paleolakes
J. M. Dohm, J.C. Ferris, V.R. Baker, R. C. Anderson, T.M. Hare, R.G. Strom, N.G. Barlow, K. L. Tanaka, J.E. Klemaszewski, D. H. Scott
2001, Journal of Geophysical Research E: Planets (106) 32943-32958
Paleotopographic reconstructions based on a synthesis of published geologic information and high-resolution topography, including topographic profiles, reveal the potential existence of an enormous drainage basin/aquifer system in the eastern part of the Tharsis region during the Noachian Period. Large topographic highs formed the margin of the gigantic drainage basin. Subsequently,...
Scleria lacustris (Cyperaceae), an aquatic and wetland sedge introduced to Florida
C.C. Jacono
2001, SIDA, Contributions to Botany (19) 1163-1170
A non-native species of Scleria, S. lacustris is reported from six counties and three major hydrologic regions in Florida. Biogeography and habitat in Florida are addressed. A description, key features and illustration are presented....
Local site effects and dynamic soil behavior
E. Afak
2001, Soil Dynamics and Earthquake Engineering (21) 453-458
Amplitudes of seismic waves increase significantly as they pass through soft soil layers near the earth's surface. This phenomenon, commonly known as site amplification, is a major factor influencing the extent of damage on structures. It is crucial that site amplification is accounted for when designing structures on soft soils....
Known and suggested quaternary faulting in the midcontinent United States
R. L. Wheeler, A. J. Crone
2001, Engineering Geology (62) 51-78
The midcontinent United States between the Appalachian and Rocky Mountains contains 40 known faults or other potentially tectonic features for which published geologic information shows or suggests Quaternary tectonic faulting. We report results of a systematic evaluation of published and other publicly available geologic evidence of Quaternary faulting. These results...
Brecciated and mineralized coals in Union County Western Kentucky coal field
J.C. Hower, D.A. Williams, C.F. Eble, T. Sakulpitakphon, D.P. Moecher
2001, International Journal of Coal Geology (47) 223-234
Coals from the D-2 and D-3 boreholes in the Grove Center 7 1/2 min quadrangle, Union County, KY, have been found to be highly brecciated and mineralized. The mineralization is dominated by a carbonate assemblage with minor sulfides and sulfates. Included among the secondary minerals is the lead selenide, clausthalite....
Strain accumulation and rotation in the Eastern California Shear Zone
J.C. Savage, Weijun Gan, J. L. Svarc
2001, Journal of Geophysical Research B: Solid Earth (106) 21995-22007
Although the Eastern California Shear Zone (ECSZ) (strike ∼N25°W) does not quite coincide with a small circle drawn about the Pacific-North America pole of rotation, trilateration and GPS measurements demonstrate that the motion within the zone corresponds to right-lateral simple shear across a vertical plane (strike N33°W±5°) roughly parallel to...
Neckband retention for lesser snow geese in the western Arctic
M.D. Samuel, Diana R. Goldberg, A. E. Smith, W. Baranyuk, E.G. Cooch
2001, Journal of Wildlife Management (65) 797-807
Neckbands are commonly used in waterfowl studies (especially geese) to identify individuals for determination of movement and behavior and to estimate population parameters. Substantial neckband loss can adversely affect these research objectives and produce biased survival estimates. We used capture, recovery, and observation histories for lesser snow geese (Chen caerulescens...
The roughness of natural terrain: A planetary and remote sensing perspective
Michael K. Shepard, Bruce A. Campbell, Mark H. Bulmer, Lisa R. Gaddis, Tom G. Farr, Jeffrey J. Plaut
2001, Journal of Geophysical Research E: Planets (106) 32777-32795
We examine the various methods and parameters in common use for quantifying and reporting surface topographic "roughness." It is shown that scale-dependent roughness parameters are almost always required, though not widely used. We suggest a method of standardizing the parameters that are computed and reported so that topographic data gathered...
Antibody-producing cells correlated to body weight in juvenile chinook salmon (Oncorhynchus tshawytscha) acclimated to optimal and elevated temperatures
L.N.M. Harrahy, C.B. Schreck, A.G. Maule
2001, Fish and Shellfish Immunology (11) 653-659
The immune response of juvenile chinook salmon (Oncorhynchus tshawytscha) ranging in weight from approximately 10 to 55 g was compared when the fish were acclimated to either 13 or 21?? C. A haemolytic plaque assay was conducted to determine differences in the number of antibody-producing cells (APC) among fish of...
Databases and simplified geology for mineralized areas, claims, mines and prospects in Wyoming
Anna B. Wilson, Terry L. Klein, William D. Heran
2001, Open-File Report 2001-497
No abstract available....
Effects of a test flood on fishes of the Colorado River in Grand Canyon, Arizona
R.A. Valdez, T.L. Hoffnagle, C.C. McIvor, T. McKinney, W.C. Leibfried
2001, Ecological Applications (11) 686-700
A beach/habitat-building flow (i.e., test flood) of 1274 m3/s, released from Glen Canyon Dam down the Colorado River through Grand Canyon, had little effect on distribution, abundance, or movement of native fishes, and only short-term effects on densities of some nonnative species. Shoreline and backwater catch rates of native fishes,...
Dietary restriction causes chronic elevation of corticosterone and enhances stress response in red-legged kittiwake chicks
A.S. Kitaysky, E.V. Kitaiskaia, J.C. Wingfield, John F. Piatt
2001, Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology (171) 701-709
Release of corticosterone in hungry kittiwake chicks facilitates begging and allows them to restore depleted energy reserves by increasing parental food provisioning. However, in order to avoid detrimental effects of chronic elevation of corticosterone, chicks might suppress adrenocortical activity in response to prolonged food shortages. In this study we examined...
Oral chytridiomycosis in the mountain yellow-legged frog (Rana muscosa)
G. M. Fellers, D. E. Green, J.E. Longcore
2001, Copeia (2001) 945-953
The chytrid fungus Batrachochytrium dendrobatidis was originally reported in wild frog populations in Panama and Australia, and from captive frogs in the U.S. National Zoological Park (Washington, DC). This recently described fungus affects the keratinized epidermis of amphibians and has been implicated as a causative factor in the declines of...
Winter severity and wolf predation on a formerly wolf-free elk herd
L. David Mech, Douglas W. Smith, Kerry M. Murphy, Daniel R. MacNulty
2001, Journal of Wildlife Management (65) 998-1003
We studied wolf (Canis lupus) predation on elk (Cervus elaphus) in Yellowstone National Park from 17 March to 15 April 1997 (severe winter conditions) and from 2 to 31 March 1998 (mild winter conditions) 2-3 years after wolves were reintroduced to the park. Elk composed 91 % of 117 kills....
Adiabatic temperature changes of magma-gas mixtures during ascent and eruption
L.G. Mastin, M.S. Ghiorso
2001, Contributions to Mineralogy and Petrology (141) 307-321
Most quantitative studies of flow dynamics in eruptive conduits during volcanic eruptions use a simplified energy equation that ignores either temperature changes, or the thermal effects of gas exsolution. In this paper we assess the effects of those simplifications by analyzing the influence of equilibrium gas exsolution and expansion on...
Engelmann spruce nitrogen dynamics across a nitrogen deposition gradient in Colorado, USA
H.M. Rueth, Jill Baron
2001, Ekologia (20) 43-49
No abstract available....
