Explosion source strong ground motions in the Mississippi embayment
C.A. Langston, P. Bodin, C. Powell, M. Withers, S. Horton, Walter D. Mooney
2006, Bulletin of the Seismological Society of America (96) 1038-1054
Two strong-motion arrays were deployed for the October 2002 Embayment Seismic Excitation Experiment to study the spatial variation of strong ground motions in the deep, unconsolidated sediments of the Mississippi embayment because there are no comparable strong-motion data from natural earthquakes in the area. Each linear array consisted of eight...
Ontogenesis of endangered humpback chub (Gila cypha) in the Little Colorado River, Arizona
Dennis M. Stone, Owen T. Gorman
2006, American Midland Naturalist (155) 123-135
The largest population of endangered humpback chub Gila cypha inhabits the Colorado River below Glen Canyon Dam and the lower 14 km of the Little Colorado River (LCR), Arizona. Currently, adults from both rivers spawn and their progenies grow and recruit to adulthood primarily within the LCR, where we studied G....
A tamarisk habitat suitability map for the continental US
J.T. Morisette, C. S. Jarnevich, A. Ullah, W. Cai, J.A. Pedelty, J.E. Gentle, T.J. Stohlgren, J.L. Schnase
2006, Frontiers in Ecology and the Environment (4) 11-17
This paper presents a national-scale map of habitat suitability for tamarisk (Tamarix spp, salt cedar), a high-priority invasive species. We successfully integrate satellite data and tens of thousands of field sampling points through logistic regression modeling to create a habitat suitability map that is 90% accurate. This interagency effort...
A trait-based test for habitat filtering: Convex hull volume
W.K. Cornwell, D.W. Schwilk, D. D. Ackerly
2006, Ecology (87) 1465-1471
Community assembly theory suggests that two processes affect the distribution of trait values within communities: competition and habitat filtering. Within a local community, competition leads to ecological differentiation of coexisting species, while habitat filtering reduces the spread of trait values, reflecting shared ecological tolerances. Many statistical tests for the effects...
Foraging destinations and marine habitat use of short-tailed albatrosses: A multi-scale approach using first-passage time analysis
R.M. Suryan, F. Sato, G.R. Balogh, Hyrenbach K. David, P.R. Sievert, K. Ozaki
2006, Deep-Sea Research Part II: Topical Studies in Oceanography (53) 370-386
We used satellite telemetry, remotely sensed data (bathymetry, chlorophyll a (chl a), sea-surface temperature (SST), wind speed) and first-passage time (FPT) analysis to determine the distribution, movement patterns, and habitat associations of short-tailed albatrosses (Phoebastria albatrus) during the non-breeding season, 2002 and 2003. Satellite transmitters were deployed on birds immediately...
The effect of multiple stressors on salt marsh end-of-season biomass
J.M. Visser, C.E. Sasser, B.S. Cade
2006, Estuaries and Coasts (29) 331-342
It is becoming more apparent that commonly used statistical methods (e.g. analysis of variance and regression) are not the best methods for estimating limiting relationships or stressor effects. A major challenge of estimating the effects associated with a measured subset of limiting factors is to account for the effects of...
Distribution of grizzly bears in the Greater Yellowstone Ecosystem, 2004
C.C. Schwartz, M.A. Haroldson, K. Gunther, D. Moody
2006, Ursus (17) 63-66
The US Fish and Wildlife Service (USFWS) proposed delisting the Yellowstone grizzly bear (Ursus arctos horribilis) in November 2005. Part of that process required knowledge of the most current distribution of the species. Here, we update an earlier estimate of occupied range (1990–2000) with data through 2004. We used kernel...
Location and timing of river-aquifer exchanges in six tributaries to the Columbia River in the Pacific Northwest of the United States
C.P. Konrad
2006, Journal of Hydrology (329) 444-470
The flow of water between rivers and contiguous aquifers influences the quantity and quality of water resources, particularly in regions where precipitation and runoff are unevenly distributed through the year, such as the Columbia Basin (CB) in northwestern United States. Investigations of basin hydrogeology and gains and losses of streamflow...
Coulomb stress transfer and tectonic loading preceding the 2002 Denali fault earthquake
Charles G. Bufe
2006, Bulletin of the Seismological Society of America (96) 1662-1674
Pre-2002 tectonic loading and Coulomb stress transfer are modeled along the rupture zone of the M 7.9 Denali fault earthquake (DFE) and on adjacent segments of the right-lateral Denali–Totschunda fault system in central Alaska, using a three-dimensional boundary-element program. The segments modeled closely follow, for about 95°, the arc...
Abundance and distribution of selected elements in soils, stream sediments, and selected forage plants from desert tortoise habitats in the Mojave and Colorado deserts, USA
M.A. Chaffee, K.H. Berry
2006, Journal of Arid Environments (67) 35-87
A baseline and background chemical survey was conducted in southeastern California, USA, to identify potential sources of toxicants in natural and anthropogenically-altered habitats of the threatened desert tortoise (Gopherus agassizii). Soil, stream sediment, and plant samples were collected from six tortoise habitat study areas in the Mojave and Colorado deserts...
Neural network prediction of carbonate lithofacies from well logs, Big Bow and Sand Arroyo Creek fields, Southwest Kansas
L. Qi, T.R. Carr
2006, Computers & Geosciences (32) 947-964
In the Hugoton Embayment of southwestern Kansas, St. Louis Limestone reservoirs have relatively low recovery efficiencies, attributed to the heterogeneous nature of the oolitic deposits. This study establishes quantitative relationships between digital well logs and core description data, and applies these relationships in a probabilistic sense to predict lithofacies in...
Sediment and nutrient accumulation within lowland bottomland ecosystems: An example from the Atchafalaya River Basin, Louisiana
C.R. Hupp, G.B. Noe
2006, Conference Paper, Hydrology and Management of Forested Wetlands - Proceeding of the International Conference
Sediment and nutrient deposition, storage, and transformations are important environmental functions of riverine forested wetland ecosystems, yet documentation and interpretation of sedimentation/nutrient processes remain incomplete. Our studies located in the Coastal Plain of southeastern USA, including the Atchafalaya Basin, La. (a distributary of the Mississippi River) serve as example for...
Effects of human recreation on the incubation behavior of American Oystercatchers
C.P. McGowan, T.R. Simons
2006, Wilson Journal of Ornithology (118) 485-493
Human recreational disturbance and its effects on wildlife demographics and behavior is an increasingly important area of research. We monitored the nesting success of American Oystercatchers (Haematopus palliatus) in coastal North Carolina in 2002 and 2003. We also used video monitoring at nests to measure the response of incubating birds...
Risk analysis for biological hazards: What we need to know about invasive species
T.J. Stohlgren, J.L. Schnase
2006, Risk Analysis (26) 163-173
Risk analysis for biological invasions is similar to other types of natural and human hazards. For example, risk analysis for chemical spills requires the evaluation of basic information on where a spill occurs; exposure level and toxicity of the chemical agent; knowledge of the physical processes involved in its rate...
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 heartbeat of the volcano: The discovery of episodic activity at Prometheus on Io
Ashley G. Davies, Lionel Wilson, Dennis Matson, Giovanni Leone, Laszlo P. Keszthelyi, Windy L. Jaeger
2006, Icarus (184) 460-477
The temporal signature of thermal emission from a volcano is a valuable clue to the processes taking place both at and beneath the surface. The Galileo Near Infrared Mapping Spectrometer (NIMS) observed the volcano Prometheus, on the jovian moon Io, on multiple occasions between 1996 and 2002. The 5 micron (μm) brightness of this volcano shows...
Integration of P- and SH-wave high-resolution seismic reflection and micro-gravity techniques to improve interpretation of shallow subsurface structure: New Madrid seismic zone
C.E. Bexfield, J.H. McBride, Andre J. M. Pugin, D. Ravat, S. Biswas, W.J. Nelson, T.H. Larson, S.L. Sargent, M.A. Fillerup, B.E. Tingey, L. Wald, M.L. Northcott, J.V. South, M.S. Okure, M.R. Chandler
2006, Tectonophysics (420) 5-21
Shallow high-resolution seismic reflection surveys have traditionally been restricted to either compressional (P) or horizontally polarized shear (SH) waves in order to produce 2-D images of subsurface structure. The northernmost Mississippi embayment and coincident New Madrid seismic zone (NMSZ) provide an ideal laboratory to study the experimental use of integrating...
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...
Estimation of temporary emigration in male toads
E. Muths, R. D. Scherer, P.S. Corn, B.A. Lambert
2006, Ecology (87) 1048-1056
Male boreal toads (Bufo boreas) are thought to return to the breeding site every year but, if absent in a particular year, will be more likely to return the following year. Using Pollock's robust design we estimated temporary emigration (the probability a male toad is absent from a breeding site...
A Bayesian random effects discrete-choice model for resource selection: Population-level selection inference
D.L. Thomas, D. Johnson, B. Griffith
2006, Journal of Wildlife Management (70) 404-412
Modeling the probability of use of land units characterized by discrete and continuous measures, we present a Bayesian random-effects model to assess resource selection. This model provides simultaneous estimation of both individual- and population-level selection. Deviance information criterion (DIC), a Bayesian alternative to AIC that is sample-size specific, is used...
Fishes associated with North Carolina shelf-edge hardbottoms and initial assessment of a proposed marine protected area
A.M. Quattrini, Steve W. Ross
2006, Bulletin of Marine Science (79) 137-163
Fish community data are limited from deeper shelf-edge hardbottoms along the southeastern U.S. continental shelf. This lack of data Hampers the design of recently proposed marine protected areas (MPAs) on the outer shelf of the southeastern U.S. During 2001-2004, sampling was conducted (57-25 m) to describe habitats and fish communities...
Lake sturgeon population characteristics in Rainy Lake, Minnesota and Ontario
W.E. Adams Jr., L.W. Kallemeyn, D.W. Willis
2006, Journal of Applied Ichthyology (22) 97-102
Rainy Lake contains a native population of lake sturgeon Acipenser fulvescens that has been largely unstudied. The aims of this study were to document the population characteristics of lake sturgeon in Rainy Lake and to relate environmental factors to year-class strength for this population. Gill-netting efforts throughout the study resulted...
Multidecadal climate variability of global lands and oceans
G.J. McCabe, M.A. Palecki
2006, International Journal of Climatology (26) 849-865
Principal components analysis (PCA) and singular value decomposition (SVD) are used to identify the primary modes of decadal and multidecadal variability in annual global Palmer Drought Severity Index (PDSI) values and sea-surface temperature (SSTs). The PDSI and SST data for 1925-2003 were detrended and smoothed (with a 10-year moving average)...
Chlorine toxicity to early life stages of freshwater mussels (Bivalvia: Unionidae)
T.W. Valenti, D.S. Cherry, R.J. Currie, R. J. Neves, J. W. Jones, R. Mair, C.M. Kane
2006, Conference Paper, Environmental Toxicology and Chemistry
Chlorine (Cl) is a highly toxic, widely used halogen disinfectant that is present in point-source pollution discharges from wastewater treatment plants and industrial facilities. The U.S. Environmental Protection Agency freshwater criteria for Cl are 19 ??g total residual Cl (TRC)/L as a maximum 1-h average concentration and 11 ??g TRC/L...
The composite method: An improved method for stream-water solute load estimation
Brent T. Aulenbach, R. P. Hooper
2006, Hydrological Processes (20) 3029-3047
The composite method is an alternative method for estimating stream-water solute loads, combining aspects of two commonly used methods: the regression-model method (which is used by the composite method to predict variations in concentrations between collected samples) and a period-weighted approach (which is used by the composite method to apply...
