Are southern California's fragmented saltmarshes capable of sustaining endemic bird populations?
A.N. Powell
Greenberg R.Maldonado J.E.Droege S.McDonald M.V., editor(s)
2006, Studies in Avian Biology 198-204
Loss of coastal saltmarshes in southern California has been estimated at 75-90% since presettlement times. The remaining wetlands are mostly fragmented and degraded, and most frequently have harsh edges adjacent to urban landscapes. Non-migratory Belding's Savannah Sparrows (Passerculus sandwichensis beldingi) and Light-footed Clapper Rails (Rallus longirostris levipes) are endemic to...
Development of the performance confirmation program at YUCCA mountain, nevada
G.D. LeCain, D. Barr, D. Weaver, R. Snell, S.W. Goodin, F.D. Hansen
2006, Conference Paper, Proceedings of the 11th International High Level Radioactive Waste Management Conference, IHLRWM
The Yucca Mountain Performance Confirmation program consists of tests, monitoring activities, experiments, and analyses to evaluate the adequacy of assumptions, data, and analyses that form the basis of the conceptual and numerical models of flow and transport associated with a proposed radioactive waste repository at Yucca Mountain, Nevada. The Performance...
Assimilation of snow covered area information into hydrologic and land-surface models
M.P. Clark, A.G. Slater, A.P. Barrett, L.E. Hay, G.J. McCabe, B. Rajagopalan, G.H. Leavesley
2006, Advances in Water Resources (29) 1209-1221
This paper describes a data assimilation method that uses observations of snow covered area (SCA) to update hydrologic model states in a mountainous catchment in Colorado. The assimilation method uses SCA information as part of an ensemble Kalman filter to alter the sub-basin distribution of snow as well as the...
Environmental and geochemical record of human-induced changes in C storage during the last millennium in a temperate wetland (Las Tablas de Daimiel National Park, central Spain)
F. Dominguez-Castro, J.I. Santisteban, R. Mediavilla, W.E. Dean, E. Lopez-Pamo, M. J. Gil-Garcia, M. B. Ruiz-Zapata
2006, Conference Paper, Tellus, Series B: Chemical and Physical Meteorology
Las Tablas de Daimiel National Park has experienced many hydrological and ecological modifications through out its history, both of natural as well as anthropogenic origin, which have affected its carbon storage capacity and carbon fluxes. The study of those variations has been carried out by the analysis of its sedimentary...
Atmospheric chemistry of a 33-34 hour old volcanic cloud from Hekla Volcano (Iceland): Insights from direct sampling and the application of chemical box modeling
William I. Rose Jr., G.A. Millard, T.A. Mather, D.E. Hunton, B. Anderson, C. Oppenheimer, B.F. Thornton, T.M. Gerlach, A.A. Viggiano, Y. Kondo, T.M. Miller, J.O. Ballenthin
2006, Journal of Geophysical Research D: Atmospheres (111)
On 28 February 2000, a volcanic cloud from Hekla volcano, Iceland, was serendipitously sampled by a DC-8 research aircraft during the SAGE III Ozone Loss and Validation Experiment (SOLVE I). It was encountered at night at 10.4 km above sea level (in the lower stratosphere) and 33-34 hours after emission....
Effect of thermal maturation on the K-Ar, Rb-Sr and REE systematics of an organic-rich New Albany Shale as determined by hydrous pyrolysis
Norbert Clauer, Sambhudas Chaudhuri, M. D. Lewan, T. Toulkeridis
2006, Chemical Geology (234) 169-177
Hydrous-pyrolysis experiments were conducted on an organic-rich Devonian-Mississippian shale, which was also leached by dilute HCl before and after pyrolysis, to identify and quantify the induced chemical and isotopic changes in the rock. The experiments significantly affect the organic-mineral organization, which plays an important role in natural interactions during diagenetic...
Soluble reactive phosphorus transport and retention in tropical, rainforest streams draining a volcanic and geothermally active landscape in Costa Rica.: Long-term concentration patterns, pore water environment and response to ENSO events
F.J. Triska, C. M. Pringle, J.H. Duff, R.J. Avanzino, A. Ramirez, M. Ardon, A. P. Jackman
2006, Biogeochemistry (81) 131-143
Soluble reactive phosphorus (SRP) transport/retention was determined at four sites in three rainforest streams draining La Selva Biological Station, Costa Rica. La Selva is located at the base of the last remaining intact rainforest transect from 30 m above sea level to 3000 m along the entire Caribbean slope of...
A simple method of predicting S-wave velocity
Myung W. Lee
2006, Geophysics (71)
Prediction of shear-wave velocity plays an important role in seismic modeling, amplitude analysis with offset, and other exploration applications. This paper presents a method for predicting S-wave velocity from the P-wave velocity on the basis of the moduli of dry rock. Elastic velocities of water-saturated sediments at low frequencies can...
Nutritional condition of Pacific Black Brant wintering at the extremes of their range
D.D. Mason, P.S. Barboza, David H. Ward
2006, Condor (108) 678-690
Endogenous stores of energy allow birds to survive periods of severe weather and food shortage during winter. We documented changes in lipid, protein, moisture, and ash in body tissues of adult female Pacific Black Brant (Branta bernicla nigricans) and modeled the energetic costs of wintering. Birds were collected at the...
Grassland songbirds in a dynamic management landscape: Behavioral responses and management strategies
N.G. Perlut, A.M. Strong, T.M. Donovan, N. J. Buckley
2006, Ecological Applications (16) 2235-2247
In recent decades, earlier and more frequent harvests of agricultural grasslands have been implicated as a major cause of population declines in grassland songbirds. From 2002 to 2005, in the Champlain Valley of Vermont and New York, USA, we studied the reproductive success of Savannah Sparrows (Passerculus sandwichensis) and Bobolinks...
New ghost-node method for linking different models with varied grid refinement
S.C. James, J.E. Dickinson, S.W. Mehl, M. C. Hill, S. A. Leake, G.A. Zyvoloski, A.-A. Eddebbarh
2006, Conference Paper, Proceedings of the 11th International High Level Radioactive Waste Management Conference, IHLRWM
A flexible, robust method for linking grids of locally refined ground-water flow models constructed with different numerical methods is needed to address a variety of hydrologic problems. This work outlines and tests a new ghost-node model-linking method for a refined "child" model that is contained within a larger and coarser...
Numerical simulation of tsunami generation by cold volcanic mass flows at Augustine Volcano, Alaska
C. F. Waythomas, P. Watts, J. S. Walder
2006, Natural Hazards and Earth System Sciences (6) 671-685
Many of the world's active volcanoes are situated on or near coastlines. During eruptions, diverse geophysical mass flows, including pyroclastic flows, debris avalanches, and lahars, can deliver large volumes of unconsolidated debris to the ocean in a short period of time and thereby generate tsunamis. Deposits of both hot and...
The ionospheric impact on GPS performance in southern polar region
C.-K. Hong, D. A. Grejner-Brzezinska, N. Arslan, M. Willis, L. Hothem
2006, Conference Paper, Proceedings of the Institute of Navigation - 19th International Technical Meeting of the Satellite Division, ION GNSS 2006
The primary objective of this paper is to present the results of the study of the effects of varying ionospheric conditions on the GPS signal tracking in the southern polar region. In the first stage of this study, the data collected by the OSU/USGS team in October-November 2003 within the...
Body-wave traveltime and amplitude shifts from asymptotic travelling wave coupling
F. Pollitz
2006, Geophysical Journal International (167) 705-736
We explore the sensitivity of finite-frequency body-wave traveltimes and amplitudes to perturbations in 3-D seismic velocity structure relative to a spherically symmetric model. Using the approach of coupled travelling wave theory, we consider the effect of a structural perturbation on an isolated portion of the seismogram. By convolving the spectrum...
Glacial modification of granite tors in the Cairngorms, Scotland
A.M. Hall, W.M. Phillips
2006, Journal of Quaternary Science (21) 811-830
A range of evidence indicates that many granite tors in the Cairngorms have been modified by the flow of glacier ice during the Pleistocene. Comparisons with SW England and the use of a space-time transformation across 38 tor groups in the Cairngorms allow a model to be developed for progressive...
Research approach to teaching groundwater biodegradation in karst aquifers
L. King, T. Byl, R. Painter
2006, Conference Paper, ASEE Annual Conference and Exposition, Conference Proceedings
TSU in partnership with the USGS has conducted extensive research regarding biode??gradation of contaminants in karst aquifers. This research resulted in the development of a numerical approach to modeling biodegradation of contaminants in karst aquifers that is taught to environmental engineering students in several steps. First, environmental engineering students are...
Environmental contaminants in fish and their associated risk to piscivorous wildlife in the Yukon River Basin, Alaska
J.E. Hinck, C. J. Schmitt, K. R. Echols, T.W. May, C.E. Orazio, D. E. Tillitt
2006, Archives of Environmental Contamination and Toxicology (51) 661-672
Organochlorine chemical residues and elemental contaminants were measured in northern pike (Esox lucius), longnose sucker (Catostomus catostomus), and burbot (Lota lota) from 10 sites in the Yukon River Basin (YRB) during 2002. Contaminant concentrations were compared to historical YRB data and to toxicity thresholds for fish and piscivorous wildlife from...
Nitrogen sources and cycling in the San Francisco Bay estuary: A nitrate dual isotopic composition approach
Scott D. Wankel, C. Kendall, C.A. Francis, A. Paytan
2006, Limnology and Oceanography (51) 1654-1664
We used the dual isotopic composition of nitrate (δ15N and δ18O) within the estuarine system of San Francisco (SF) Bay, California, to explore the utility of this approach for tracing sources and cycling of nitrate (NO2−). Surface water samples from 49 sites within the estuary were sampled during July–August 2004....
Prediction and discovery of new geothermal resources in the Great Basin: Multiple evidence of a large undiscovered resource base
M.F. Coolbaugh, G. L. Raines, R. E. Zehner, L. Shevenell, C.F. Williams
2006, Conference Paper, Transactions - Geothermal Resources Council
Geothermal potential maps by themselves cannot directly be used to estimate undiscovered resources. To address the undiscovered resource base in the Great Basin, a new and relatively quantitative methodology is presented. The methodology involves three steps, the first being the construction of a data-driven probabilistic model of the location of...
Evaluating uncertainty in predicting spatially variable representative elementary scales in fractured aquifers, with application to Turkey Creek Basin, Colorado
Tristan P. Wellman, Eileen P. Poeter
2006, Water Resources Research (42)
Computational limitations and sparse field data often mandate use of continuum representation for modeling hydrologic processes in large‐scale fractured aquifers. Selecting appropriate element size is of primary importance because continuum approximation is not valid for all scales. The traditional approach is to select elements by identifying a single representative elementary...
Sediment distribution and transport across the continental shelf and slope under idealized wind forcing
S.A. Condie, C. R. Sherwood
2006, Progress in Oceanography (70) 255-270
Resuspension, transport, and deposition of sediments over the continental shelf and slope are complex processes and there is still a need to understand the underlying spatial and temporal dynamical scales. As a step towards this goal, a two-dimensional slice model (zero gradients in the alongshore direction) based on the primitive...
Dietary exposure of largemouth bass to OCPs changes expression of genes important for reproduction
Natalia Garcia-Reyero, D.S. Barber, T. S. Gross, K. G. Johnson, M. S. Sepulveda, N.J. Szabo, N. D. Denslow
2006, Aquatic Toxicology (78) 358-369
Dieldrin and p,p???-DDE are ubiquitous contaminants known to act as endocrine disruptors, causing impaired development and reproduction in fish and wildlife. In order to elucidate the mechanisms by which dieldrin and p,p???-DDE cause endocrine disruption in largemouth bass (Micropterus salmoides), fish were exposed subchronically through the diet to both contaminants....
Fuel loads, fire regimes, and post-fire fuel dynamics in Florida Keys pine forests
J.P. Sah, M.S. Ross, J.R. Snyder, S. Koptur, H.C. Cooley
2006, International Journal of Wildland Fire (15) 463-478
In forests, the effects of different life forms on fire behavior may vary depending on their contributions to total fuel loads. We examined the distribution of fuel components before fire, their effects on fire behavior, and the effects of fire on subsequent fuel recovery in pine forests within the National...
Comparison of selenium bioaccumulation in the clams Corbicula fluminea and Potamocorbula amurensis: A bioenergetic modeling approach
B.-G. Lee, J.-S. Lee, S. N. Luoma
2006, Environmental Toxicology and Chemistry (25) 1933-1940
Selenium uptake from food (assimilation efficiency) and dissolved phase (influx rate) as well as loss kinetics (efflux rate) were compared between two bivalves, Corbicula fluminea and Potamocorbula amurensis. The effects of salinity and temperature on these kinetic parameters for both clam species also were evaluated. The Asiatic clam, C. fluminea,...
Comparison of the historical record of earthquake hazard with seismic-hazard models for New Zealand and the continental United States
Mark W. Stirling, Mark D. Petersen
2006, Bulletin of the Seismological Society of America (96) 1978-1994
We compare the historical record of earthquake hazard experienced at 78 towns and cities (sites) distributed across New Zealand and the continental United States with the hazard estimated from the national probabilistic seismic-hazard (PSH) models for the two countries. The two PSH models are constructed with similar methodologies and data....
