Temporal and spatial variability of fecal indicator bacteria in the surf zone off Huntington Beach, CA
L.K. Rosenfeld, C.D. McGee, G.L. Robertson, M.A. Noble, B.H. Jones
2006, Marine Environmental Research (61) 471-493
Fecal indicator bacteria concentrations measured in the surf zone off Huntington Beach, CA from July 1998-December 2001 were analyzed with respect to their spatial patterns along 23 km of beach, and temporal variability on time scales from hourly to fortnightly. The majority of samples had bacterial concentrations less than, or...
Classification of leafy spurge with earth observing-1 advanced land imager
S. Stitt, R. Root, K. Brown, S. Hager, C. Mladinich, G.L. Anderson, K. Dudek, M.R. Bustos, R. Kokaly
2006, Rangeland Ecology and Management (59) 507-511
Leafy spurge (Euphorbia esula L.) is an invasive exotic plant that can completely displace native plant communities. Automated techniques for monitoring the location and extent of leafy spurge, especially if available on a seasonal basis, could add greatly to the effectiveness of control measures. As part of a larger study...
Genetic management guidelines for captive propagation of freshwater mussels (unionoidea)
J. W. Jones, E.M. Hallerman, R. J. Neves
2006, Journal of Shellfish Research (25) 527-535
Although the greatest global diversity of freshwater mussels (???300 species) resides in the United States, the superfamily Unionoidea is also the most imperiled taxon of animals in the nation. Thirty-five species are considered extinct, 70 species are listed as endangered or threatened, and approximately 100 more are species of conservation...
Seismomagnetic effects from the long-awaited 28 September 2004 M 6.0 parkfield earthquake
M.J.S. Johnston, Y. Sasai, G.D. Egbert, R.J. Mueller
2006, Bulletin of the Seismological Society of America (96)
Precise measurements of local magnetic fields have been obtained with a differentially connected array of seven synchronized proton magnetometers located along 60 km of the locked-to-creeping transition region of the San Andreas fault at Parkfield, California, since 1976. The M 6.0 Parkfield earthquake on 28 September 2004, occurred within this...
Late Holocene lake-level fluctuations in Walker Lake, Nevada, USA
F. Yuan, B.K. Linsley, S. S. Howe, S.P. Lund, J. P. McGeehin
2006, Palaeogeography, Palaeoclimatology, Palaeoecology (240) 497-507
Walker Lake, a hydrologically closed, saline, and alkaline lake, is situated along the western margin of the Great Basin in Nevada of the western United States. Analyses of the magnetic susceptibility (??), total inorganic carbon (TIC), and oxygen isotopic composition (??18O) of carbonate sediments including ostracode shells (Limnocythere ceriotuberosa) from...
CO2 and CH4 exchanges between land ecosystems and the atmosphere in northern high latitudes over the 21st century
Q. Zhuang, J. M. Melillo, M.C. Sarofim, D. W. Kicklighter, A. D. McGuire, B.S. Felzer, A. Sokolov, R.G. Prinn, P.A. Steudler, S. Hu
2006, Geophysical Research Letters (33)
Terrestrial ecosystems of the northern high latitudes (above 50??N) exchange large amounts of CO2 and CH4 with the atmosphere each year. Here we use a process-based model to estimate the budget of CO 2 and CH4 of the region for current climate conditions and for future scenarios by considering effects...
Estimating background and threshold nitrate concentrations using probability graphs
S.V. Panno, W.R. Kelly, A.T. Martinsek, Keith C. Hackley
2006, Ground Water (44) 697-709
Because of the ubiquitous nature of anthropogenic nitrate (NO 3-) in many parts of the world, determining background concentrations of NO3- in shallow ground water from natural sources is probably impossible in most environments. Present-day background must now include diffuse sources of NO3- such as disruption of soils and oxidation...
A spatially explicit approach for evaluating relationships among coastal cutthroat trout, habitat, and disturbance in small Oregon streams
R. E. Gresswell, C.E. Torgersen, D.S. Bateman, T.J. Guy, S.R. Hendricks, J. E. B. Wofford
R. Flint Hughes, L. Wang, P. Seelbach, editor(s)
2006, Book chapter, Landscape Influences on Stream Habitats and Biological Assemblages
Abstract has not been submitted...
Overview of investigations into mercury in ground water, soils, and septage, New Jersey coastal plain
J. L. Barringer, Zoltan Szabo
2006, Water, Air, & Soil Pollution (175) 193-221
Since the early 1980s, investigations by health departments of eight counties in southern New Jersey, by the NJ Department of Environmental Protection (NJDEP), and subsequently by the US Geological Survey (USGS), have shown that Hg concentrations in water tapped by about 600 domestic wells exceed the maximum contaminant level (MCL)...
Spatio-temporal availability of soft mast in clearcuts in the Southern Appalachians
M. J. Reynolds-Hogland, M.S. Mitchell, R. A. Powell
2006, Forest Ecology and Management (237) 103-114
Soft mast is an important resource for many wild populations in the Southern Appalachians, yet the way clear-cutting affects availability of soft mast though time is not fully understood. We tested a theoretical model of temporal availability of soft mast in clearcuts using empirical data on percent cover and berry...
A landscape perspective of the stream corridor invasion and habitat characteristics of an exotic (Dioscorea oppositifolia) in a pristine watershed in Illinois
J.R. Thomas, B. Middleton, D.J. Gibson
2006, Biological Invasions (8) 1103-1113
The spatial distribution of exotics across riparian landscapes is not uniform, and research elaborating the environmental constraints and dispersal behavior that underlie these patterns of distribution is warranted. This study examined the spatial distribution, growth patterns, and habitat constraints of populations of the invasive Dioscorea oppositifolia in a forested stream...
CPT-based probabilistic and deterministic assessment of in situ seismic soil liquefaction potential
R.E.S. Moss, R.B. Seed, R. E. Kayen, J.P. Stewart, A. Der Kiureghian, K.O. Cetin
2006, Journal of Geotechnical and Geoenvironmental Engineering (132) 1032-1051
This paper presents a complete methodology for both probabilistic and deterministic assessment of seismic soil liquefaction triggering potential based on the cone penetration test (CPT). A comprehensive worldwide set of CPT-based liquefaction field case histories were compiled and back analyzed, and the data then used to develop probabilistic triggering correlations....
Alkaline volcanic rocks from the Columbia Hills, Gusev crater, Mars
H.Y. McSween, S. W. Ruff, R.V. Morris, J.F. Bell III, Kenneth E. Herkenhoff, Ralf Gellert, K.R. Stockstill, L.L. Tornabene, S. W. Squyres, J.A. Crisp, P. R. Christensen, T.J. McCoy, D. W. Mittlefehldt, M. Schmidt
2006, Journal of Geophysical Research E: Planets (111)
Irvine, Backstay, and Wishstone are the type specimens for three classes of fine-grained or fragmental, relatively unaltered rocks with distinctive thermal emission spectra, found as float on the flanks of the Columbia Hills. Chemical analyses indicate that these rocks are mildly alkaline basalt, trachybasalt, and tephrite, respectively. Their mineralogy consists...
Groundwater-transported dissolved organic nitrogen exports from coastal watersheds
K.D. Kroeger, Marci L. Cole, I. Valiela
2006, Limnology and Oceanography (51) 2248-2261
We analyzed groundwater-transported nitrogen (N) exports from 41 watershed segments that comprised 10 Cape Cod, Massachusetts watersheds to test the hypotheses that chemical form of N exports is related to land use and to length of flow paths through watersheds. In the absence of human habitation, these glacial outwash-plain watersheds...
Secondary gas emissions during coal desorption, Marathon Grassim Oskolkoff-1 Well, Cook Inlet Basin, Alaska: Implications for resource assessment
C.E. Barker, T. Dallegge
2006, Bulletin of Canadian Petroleum Geology (54) 273-291
Cuttings samples of sub-bituminous humic coals from the Oligocene to Pliocene Tyonek Formation, Cook Inlet Basin, Alaska show secondary gas emissions whose geochemistry is consistent with renewed microbial methanogenesis during canister desorption. The renewed methanogenesis was noted after initial desorption measurements had ceased and a canister had an air and...
Foraging behavior of redheads (Aythya americana) wintering in Texas and Louisiana
M.C. Woodin, T.C. Michot
2006, Conference Paper, Hydrobiologia
Redheads, Aythya americana, concentrate in large numbers annually in traditional wintering areas along the western and northern rim of the Gulf of Mexico. Two of these areas are the Laguna Madre of Texas and Chandeleur Sound of Louisiana. We collected data on 54,340 activities from 103 redhead flocks in Texas...
Reproductive condition and occurrence of intersex in bighead carp and silver carp in the Missouri River
D. M. Papoulias, D. Chapman, D. E. Tillitt
2006, Hydrobiologia (571) 355-360
Little is known about the reproductive biology of the exotic bighead carp Hypophthalmichthys nobilis and silver carp Hypophthalmichthys molitrix in the Missouri River. In order to fill this gap in understanding, herein is described the reproductive condition of these Asian carps. Evidence is presented which indicates that bighead and silver...
Testing the use of aeromagnetic data for the determination of Curie depth in California
H.E. Ross, R.J. Blakely, Mark D. Zoback
2006, Geophysics (71)
Using California as a test region, we have examined the feasibility of using Curie-isotherm depths, estimated from magnetic anomalies, as a proxy for lithospheric thermal structure. Our method follows previous studies by dividing a regional aeromagnetic database into overlapping subregions and analyzing the power-density spectrum of each subregion, but we...
Protolith and metamorphic ages of the Haiyangsuo Complex, eastern China: A non-UHP exotic tectonic slab in the Sulu ultrahigh-pressure terrane
J. G. Liou, T. Tsujimori, W. Chu, R. Y. Zhang, J. L. Wooden
2006, Conference Paper, Mineralogy and Petrology
The Haiyangsuo Complex in the NE Sulu ultrahigh-pressure (UHP) terrane has discontinuous, coastal exposures of Late Archean gneiss with amphibolitized granulite, amphibolite, Paleoproterozoic metagabbroic intrusives, and Cretaceous granitic dikes over an area of about 15 km2. The U-Pb SHRIMP dating of zircons indicates that theprotolith age of a garnet-biotite gneiss...
A specter of coexistence: Is centrifugal community organization haunted by the ghost of competition?
Gideon Wasserberg, B.P. Kotler, D.W. Morris, Z. Abramsky
2006, Israel Journal of Ecology and Evolution (52) 123-140
In a centrifugally organized community species prefer the same habitat (called "core") but differ in their secondary habitat preferences. The first model of centrifugal community organization (CCO) predicted that optimally foraging, symmetrically competing species would share use of the core habitat at all density combinations. But one might also assume...
On the discovery of CO nighttime emissions on Titan by Cassini/VIMS: Derived stratospheric abundances and geological implications
K. H. Baines, P. Drossart, M. A. Lopez-Valverde, S.K. Atreya, Christophe Sotin, T.W. Momary, R. H. Brown, B. J. Buratti, R. N. Clark, P. D. Nicholson
2006, Planetary and Space Science (54) 1552-1562
We present a quantitative analysis of CO thermal emissions discovered on the nightside of Titan by Baines et al. [2005. The atmospheres of Saturn and Titan in the near-infrared: First results of Cassini/VIMS. Earth, Moon, and Planets, 96, 119-147]. in Cassini/VIMS spectral imagery. We identify these emission features as the...
Using self-organizing maps to determine observation threshold limit predictions in highly variant data
C.A. Paganoni, K.C. Chang, M. B. Robblee
2006, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
A significant data quality challenge for highly variant systems surrounds the limited ability to quantify operationally reasonable limits on the data elements being collected and provide reasonable threshold predictions. In many instances, the number of influences that drive a resulting value or operational range is too large to enable physical...
Gas-water-rock interactions in Frio Formation following CO2 injection: Implications for the storage of greenhouse gases in sedimentary basins
Yousif K. Kharaka, David R. Cole, Susan D. Hovorka, W.D. Gunter, Kevin G. Knauss, Barry M. Freifeild
2006, Geology (34) 577-580
To investigate the potential for the geologic storage of CO2 in saline sedimentary aquifers, 1600 t of CO2 were injected at 1500 m depth into a 24-m-thick sandstone section of the Frio Formation, a regional brine and oil reservoir in the U.S. Gulf Coast....
Size dimorphism, molt status, and body mass variation of Prairie Falcons nesting in the Snake River Birds of Prey National Conservation Area
Karen Steenhof, James O. McKinley
2006, Journal of Raptor Research (40) 71-75
Birds face challenges in how they allocate energy during the reproductive season. Most temperate zone species do not breed and molt at the same time, presumably because of the high energy demands of these two activities (Espie et al. 1996 and citations therein). However, representatives of at least four raptor...
Geophysical setting of the 2000 ML 5.2 Yountville, California, earthquake: Implications for seismic Hazard in Napa Valley, California
V.E. Langenheim, R. W. Graymer, R.C. Jachens
2006, Bulletin of the Seismological Society of America (96) 1192-1198
The epicenter of the 2000 ML 5.2 Yountville earthquake was located 5 km west of the surface trace of the West Napa fault, as defined by Helley and Herd (1977). On the basis of the re-examination of geologic data and the analysis of potential field data, the earthquake occurred on...
