Earthquake lights and the stress-activation of positive hole charge carriers in rocks
F. St-Laurent, J.S. Derr, F.T. Freund
2006, Physics and Chemistry of the Earth (31) 305-312
Earthquake-related luminous phenomena (also known as earthquake lights) may arise from (1) the stress-activation of positive hole (p-hole) charge carriers in igneous rocks and (2) the accumulation of high charge carrier concentrations at asperities in the crust where the stress rates increase very rapidly as an earthquake approaches. It is...
A framework for spatial risk assessments: Potential impacts of nonindigenous invasive species on native species
Craig R. Allen, A.R. Johnson, L. Parris
2006, Ecology and Society (11)
Many populations of wild animals and plants are declining and face increasing threats from habitat fragmentation and loss as well as exposure to stressors ranging from toxicants to diseases to invasive nonindigenous species. We describe and demonstrate a spatially explicit ecological risk assessment that allows for the incorporation of a...
Warming and earlier spring increase Western U.S. forest wildfire activity
A.L. Westerling, H.G. Hidalgo, D.R. Cayan, T.W. Swetnam
2006, Science (313) 940-943
Western United States forest wildfire activity is widely thought to have increased in recent decades, yet neither the extent of recent changes nor the degree to which climate may be driving regional changes in wildfire has been systematically documented. Much of the public and scientific discussion of changes in western...
Effect of summer throughfall exclusion, summer drought, and winter snow cover on methane fluxes in a temperate forest soil
W. Borken, E.A. Davidson, K. Savage, E.T. Sundquist, P. Steudler
2006, Soil Biology and Biochemistry (38) 1388-1395
Soil moisture strongly controls the uptake of atmospheric methane by limiting the diffusion of methane into the soil, resulting in a negative correlation between soil moisture and methane uptake rates under most non-drought conditions. However, little is known about the effect of water stress on methane uptake in temperate forests...
Bald Friar Metabasalt and Kennett Square Amphibolite: Two Iapetan Ocean Floor Basalts
R.C. Smith II
2006, Northeastern Geology and Environmental Sciences (28) 238-253
The Bald Friar Metabasalt (BFM) and Kennett Square Amphibolite (KSA) are basaltic units found in the Piedmont of southeastern Pennsylvania. The BFM is also recognized in northern Maryland. Both are believed to represent fragments of the floor of the Iapetus Ocean, but are not known occur in direct association with...
Evaluating the relative contributions of hydroperiod and soil fertility on growth of south Florida mangroves
K. W. Krauss, T.W. Doyle, R.R. Twilley, V. H. Rivera-Monroy, J.K. Sullivan
2006, Hydrobiologia (569) 311-324
Low and high water periods create contrasting challenges for trees inhabiting periodically flooded wetlands. Low to moderate flood durations and frequencies may bring nutrient subsidies, while greater hydroperiods can be energetically stressful because of oxygen deficiency. We tested the hypothesis that hydroperiod affects the growth of mangrove seedlings and saplings...
Genetic characterization of Zostera asiatica on the Pacific Coast of North America
Sandra L. Talbot, S. Wyllie-Echeverria, David H. Ward, Jolene R. Rearick, George K. Sage, B. Chesney, R. C. Phillips
2006, Aquatic Botany (85) 169-176
We gathered sequence information from the nuclear 5.8S rDNA gene and associated internal transcribed spacers, ITS-1 and ITS-2 (5.8S rDNA/ITS), and the chloroplast maturase K (matK) gene, from Zostera samples collected from subtidal habitats in Monterey and Santa Barbara (Isla Vista) bays, California, to test the hypothesis that these plants are conspecific...
Effects of substrate and hydrodynamic conditions on the formation of mussel beds in a large river
Y. Morales, L.J. Weber, A.E. Mynett, T.J. Newton
2006, Journal of the North American Benthological Society (25) 664-676
A numerical model for simulation of freshwater mussel dynamics was used to investigate the effects of substrate and hydrodynamic conditions on the formation of mussel beds in a 10-km reach of the Upper Mississippi River (UMR). Suitable habitats for mussel survival were identified by creating a dimensionless parameter (shear stress...
A static predictor of seismic demand on frames based on a post-elastic deflected shape
Y. Mori, T. Yamanaka, N. Luco, C.A. Cornell
2006, Earthquake Engineering and Structural Dynamics (35) 1295-1318
Predictors of seismic structural demands (such as inter-storey drift angles) that are less time-consuming than nonlinear dynamic analysis have proven useful for structural performance assessment and for design. Luco and Cornell previously proposed a simple predictor that extends the idea of modal superposition (of the first two modes) with the...
Mortality and pathology in brown bullheads Amieurus nebulosus associated with a spontaneous Edwardsiella ictaluri outbreak under tank culture conditions
L. R. Iwanowicz, A.R. Griffin, Deborah D. Cartwright, V. S. Blazer
2006, Diseases of Aquatic Organisms (70) 219-225
Brown bullheads Amieurus nebulosus (family Ictaluridae) are commonly used as a sentinel of environmental contamination. These fish are not generally cultured under laboratory conditions and little is known about their disease susceptibility. Here we report an outbreak of disease due to Edwardsiella ictaluri in a laboratory population of tank-reared, wild-caught...
The 2005 La Conchita, California, landslide
R.W. Jibson
2006, Conference Paper, Landslides
[No abstract available]...
Should heterogeneity be the basis for conservation? Grassland bird response to fire and grazing
S.D. Fuhlendorf, W.C. Harrell, David M. Engle, R.G. Hamilton, C.A. Davis, David M. Leslie Jr.
2006, Ecological Applications (16) 1706-1716
In tallgrass prairie, disturbances such as grazing and fire can generate patchiness across the landscape, contributing to a shifting mosaic that presumably enhances biodiversity. Grassland birds evolved within the context of this shifting mosaic, with some species restricted to one or two patch types created under spatially and temporally distinct...
Spatial use by wintering greater white-fronted geese relative to a decade of habitat change in California's Central Valley
Joshua T. Ackerman, John Y. Takekawa, D.L. Orthmeyer, J. P. Fleskes, J.L. Yee, K.L. Kruse
2006, Journal of Wildlife Management (70) 965-976
We investigated the effect of recent habitat changes in California's Central Valley on wintering Pacific greater white-fronted geese (Anser albifrons frontalis) by comparing roost-to-feed distances, distributions, population range sizes, and habitat use during 1987-1990 and 1998-2000. These habitat changes included wetland restoration and agricultural land enhancement due to the 1990...
Hazardous cracks running through Arizona
R. Harris, M.L. Allison
2006, Geotimes (51) 24-27
[No abstract available]...
Foreword: Climate-disturbance interactions in boreal forest ecosystems
A. D. McGuire, M. Apps
2006, Conference Paper, Mitigation and Adaptation Strategies for Global Change
[No abstract available]...
USGS National Wildlife Health Center's Quarterly Wildlife Mortality Report
K. A. Converse, R. Sohn, G. McLaughlin
2006, Supplement to the Journal of Wildlife Diseases (42)
Predicting water-surface fluctuation of continental lakes: A RS and GIS based approach in Central Mexico
M.E. Mendoza, G. Bocco, M. Bravo, Granados E. Lopez, W. R. Osterkamp
2006, Water Resources Management (20) 291-311
Changes in the water-surface area occupied by the Cuitzeo Lake, Mexico, during the 1974-2001 period are analysed in this study. The research is based on remote sensing and geographic information techniques, as well as statistical analysis. High-resolution satellite image data were used to analyse the 1974-2000 period, and very low-resolution...
Usoi dam wave overtopping and flood routing in the Bartang and Panj Rivers, Tajikistan
J. C. Risley, J. S. Walder, R.P. Denlinger
2006, Natural Hazards (38) 375-390
The Usoi dam was created in the winter of 1911 after an enormous seismogenic rock slide completely blocked the valley of the Bartang River in the Pamir Mountains of southeastern Tajikistan. At present the dam impounds 17 million cubic meters of water in Lake Sarez. Flood volume and discharge estimates...
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...
A holistic approach to taxonomic evaluation of two closely related endangered freshwater mussel species, the oyster mussel Epioblasma capsaeformis and tan riffleshell Epioblasma florentina walkeri (Bivalvia: Unionidae)
J. W. Jones, R. J. Neves, S.A. Ahlstedt, E.M. Hallerman
2006, Journal of Molluscan Studies (72) 267-283
Species in the genus Epioblasma have specialized life history requirements and represent the most endangered genus of freshwater mussels (Unionidae) in the world. A genetic characterization of extant populations of the oyster mussel E. capsaeformis and tan riffleshell E. florentina walkeri sensu late was conducted to assess taxonomic validity and...
Local thickening of the Cascadia forearc crust and the origin of seismic reflectors in the uppermost mantle
A.J. Calvert, K. Ramachandran, H. Kao, M. A. Fisher
2006, Tectonophysics (420) 175-188
Seismic reflection profiles from three different surveys of the Cascadia forearc are interpreted using P wave velocities and relocated hypocentres, which were both derived from the first arrival travel time inversion of wide-angle seismic data and local earthquakes. The subduction decollement, which is characterized beneath the continental shelf by a...
The atmospheres of Saturn and Titan in the near-infrared: First results of Cassini/Vims
K. H. Baines, T.W. Momary, B. J. Buratti, D. L. Matson, R.M. Nelson, P. Drossart, B. Sicardy, V. Formisano, G. Bellucci, A. Coradini, C. Griffith, R. H. Brown, J.-P. Bibring, Y. Langevin, F. Capaccioni, P. Cerroni, R. N. Clark, M. Combes, D. P. Cruikshank, R. Jaumann, T.B. McCordt, V. Mennella, P. D. Nicholson, Christophe Sotin
2006, Earth, Moon and Planets (96) 119-147
The wide spectral coverage and extensive spatial, temporal, and phase-angle mapping capabilities of the Visual Infrared Mapping Spectrometer (VIMS) onboard the Cassini-Huygens Orbiter are producing fundamental new insights into the nature of the atmospheres of Saturn and Titan. For both bodies, VIMS maps over time and solar phase angles provide...
Methods in polarized light microscopy: An overview and historical perspective
D. E. Kile
2006, Conference Paper, Microscopy and Microanalysis
[No abstract available]...
Strontium
J.A. Ober
2006, Mining Engineering (58) 57
China, Mexico, Spain and Turkey are the world's leading producers of celestite (strontium sulphate). These countries accounted for 98% of the total world production in 2005. For the same period, US apparent consumption of strontium decreased to 12.3 kt. Imports were 21.2 kt, of which 84% came from Mexico. Imports...
Risk of Myxobolus cerebralis infection to rainbow trout in the Madison River, Montana, USA
R.C. Krueger, B.L. Kerans, E.R. Vincent, C. Rasmussen
2006, Ecological Applications (16) 770-783
Myxobolus cerebralis, the parasite that causes salmonid whirling disease, has had detrimental effects on several salmonid populations in the Intermountain West, including the rainbow trout in the Madison River, Montana, USA. The goal of this study was to examine relationships among characteristics of the environment, Tubifex tubifex (the alternate host)...
