Field determination of optimal dates for the discrimination of invasive wetland plant species using derivative spectral analysis
M. Laba, F. Tsai, Danielle Ogurcak, S. Smith, M. E. Richmond
2005, Photogrammetric Engineering and Remote Sensing (71) 603-611
Mapping invasive plant species in aquatic and terrestrial ecosystems helps to understand the causes of their progression, manage some of their negative consequences, and control them. In recent years, a variety of new remote-sensing techniques, like Derivative Spectral Analysis (DSA) of hyperspectral data, have been developed to facilitate this mapping....
Modeling of site occupancy dynamics for northern spotted owls, with emphasis on the effects of barred owls
Gail S. Olson, Robert G. Anthony, Eric D. Forsman, Steven H. Ackers, Peter J. Loschl, Janice A. Reid, Katie M. Dugger, Elizabeth M. Glenn, William J. Ripple
2005, Journal of Wildlife Management (69) 918-932
Northern spotted owls (Strix occidentalis caurina) have been studied intensively since their listing as a threatened species by the U.S. Fish and Wildlife Service in 1990. Studies of spotted owl site occupancy have used various binary response measures, but most of these studies have made the assumption that detectability is...
Leaf fluctuating asymmetry, soil disturbance and plant stress: A multiple year comparison using two herbs, Ipomoea pandurata and Cnidoscolus stimulosus
D.C. Freeman, M. L. Brown, J.J. Duda, J.H. Graraham, J.M. Emlen, A.J. Krzysik, H. Balbach, D.A. Kovacic, J.C. Zak
2005, Ecological Indicators (5) 85-95
We studied Cnidoscolus stimulosus and Ipomoea pandurata, two common herbs of the Fall Line Sandhills to assess their potential as ecosystem level stress indicators. We focused on plants because they are among the most persistent organisms in terrestrial ecosystems. We used developmental instability as an indicator of plant population stress....
Seismic joint analysis for non-destructive testing of asphalt and concrete slabs
N. Ryden, C.B. Park
2005, Conference Paper, Geotechnical Special Publication
A seismic approach is used to estimate the thickness and elastic stiffness constants of asphalt or concrete slabs. The overall concept of the approach utilizes the robustness of the multichannel seismic method. A multichannel-equivalent data set is compiled from multiple time series recorded from multiple hammer impacts at progressively different...
Possible pingos and a periglacial landscape in northwest Utopia Planitia
R.J. Soare, D.M. Burr, Bun Tseung J.-M. Wan
2005, Icarus (174) 373-382
Hydrostatic (closed-system) pingos are small, elongate to circular, ice-cored mounds that are perennial features of some periglacial landscapes. The growth and development of hydrostatic pingos is contingent upon the presence of surface water, freezing processes and of deep, continuous, ice-cemented permafrost. Other cold-climate landforms such as small-sized, polygonal patterned ground...
Orientation of three-component geophones in the San Andreas Fault observatory at depth Pilot Hole, Parkfield, California
V. Oye, W.L. Ellsworth
2005, Bulletin of the Seismological Society of America (95) 751-758
To identify and constrain the target zone for the planned SAFOD Main Hole through the San Andreas Fault (SAF) near Parkfield, California, a 32-level three-component (3C) geophone string was installed in the Pilot Hole (PH) to monitor and improve the locations of nearby earthquakes. The orientation of the 3C geophones...
Discovery sequence and the nature of low permeability gas accumulations
E. D. Attanasi
2005, Natural Resources Research (14) 129-135
There is an ongoing discussion regarding the geologic nature of accumulations that host gas in low-permeability sandstone environments. This note examines the discovery sequence of the accumulations in low permeability sandstone plays that were classified as continuous-type by the U.S. Geological Survey for the 1995 National Oil and Gas Assessment....
Temporal analysis of the frequency and duration of low and high streamflow: Years of record needed to characterize streamflow variability
S. Huh, D.A. Dickey, M. R. Meador, K.E. Ruhl
2005, Journal of Hydrology (310) 78-94
A temporal analysis of the number and duration of exceedences of high- and low-flow thresholds was conducted to determine the number of years required to detect a level shift using data from Virginia, North Carolina, and South Carolina. Two methods were used - ordinary least squares assuming a known error...
Application of wavelet analysis for monitoring the hydrologic effects of dam operation: Glen canyon dam and the Colorado River at lees ferry, Arizona
M.A. White, J. C. Schmidt, D.J. Topping
2005, River Research and Applications (21) 551-565
Wavelet analysis is a powerful tool with which to analyse the hydrologic effects of dam construction and operation on river systems. Using continuous records of instantaneous discharge from the Lees Ferry gauging station and records of daily mean discharge from upstream tributaries, we conducted wavelet analyses of the hydrologic structure...
Crack azimuths on Europa: The G1 lineament sequence revisited
A.R. Sarid, R. Greenberg, G.V. Hoppa, D.M. Brown Jr., P. Geissler
2005, Icarus (173) 469-479
The tectonic sequence in the anti-jovian area covered by regional mapping images from Galileo's orbit E15 is determined from a study of cross-cutting relationships among lineament features. The sequence is used to test earlier results from orbit G1, based on lower resolution images, which appeared to display a progressive change...
Home range and habitat use by Great Horned Owls (Bubo virginianus) in Southern California
J.R. Bennett, P.H. Bloom
2005, Journal of Raptor Research (39) 119-126
Great Horned Owls (Bubo virginianus) are a common, widespread species that can be found in a variety of habitats across most of North America, but little is known about their space and habitat requirements. Using radiotelemetry, location data were collected on nine male and five female Great Horned Owls to...
Real-time forecasts of tomorrow's earthquakes in California
M.C. Gerstenberger, S. Wiemer, L.M. Jones, P.A. Reasenberg
2005, Nature (435) 328-331
Despite a lack of reliable deterministic earthquake precursors, seismologists have significant predictive information about earthquake activity from an increasingly accurate understanding of the clustering properties of earthquakes. In the past 15 years, time-dependent earthquake probabilities based on a generic short-term clustering model have been made publicly available in near-real time...
The Circumpolar Arctic vegetation map
Donald A. Walker, Martha K. Raynolds, F.J.A. Daniels, E. Einarsson, A. Elvebakk, W.A. Gould, A.E. Katenin, S.S. Kholod, C. J. Markon, E. S. Melnikov, N.G. Moskalenko, Stephen S. Talbot, B.A. Yurtsev, L.C. Bliss, S.A. Edlund, S.C. Zoltai, M. Wilhelm, C. Bay, G. Gudjonsson, G.V. Ananjeva, D.S. Drozdov, L.A. Konchenko, Y.V. Korostelev, O.E. Ponomareva, N.V. Matveyeva, I.N. Safranova, R. Shelkunova, A.N. Polezhaev, B.E. Johansen, H.A. Maier, D.F. Murray, Michael D. Fleming, N.G. Trahan, T.M. Charron, S.M. Lauritzen, B.A. Vairin
2005, Journal of Vegetation Science (16) 267-282
Question: What are the major vegetation units in the Arctic, what is their composition, and how are they distributed among major bioclimate subzones and countries? Location: The Arctic tundra region, north of the tree line. Methods: A photo-interpretive approach was used to delineate the vegetation onto an Advanced Very High...
Variability in colony attendance of crevice-nesting horned puffins: Implications for population monitoring
A.M.A. Harding, John F. Piatt, G.V. Byrd, Scott A. Hatch, N. B. Konyukhov, E.U. Golubova, J.C. Williams
2005, Journal of Wildlife Management (69) 1279-1296
It is difficult to survey crevice-nesting seabirds because nest-sites are hard to identify and count, and the number of adult birds attending a colony can be extremely variable within and between days. There is no standardized method for surveying crevice-nesting horned puffins (Fratercula corniculata), and consequently little is known...
Indoor radon risk potential of Hawaii
G.M. Reimer, S.L. Szarzi
2005, Journal of Radioanalytical and Nuclear Chemistry (264) 365-369
A comprehensive evaluation of radon risk potential in the State of Hawaii indicates that the potential for Hawaii is low. Using a combination of factors including geology, soils, source-rock type, soil-gas radon concentrations, and indoor measurements throughout the state, a general model was developed that permits prediction for various regions...
Slicing up the San Francisco Bay Area: Block kinematics and fault slip rates from GPS-derived surface velocities
M. A. d'Alessio, I.A. Johanson, R. Burgmann, D.A. Schmidt, M.H. Murray
2005, Journal of Geophysical Research B: Solid Earth (110) 1-19
Observations of surface deformation allow us to determine the kinematics of faults in the San Francisco Bay Area. We present the Bay Area velocity unification (BA??VU??, "bay view"), a compilation of over 200 horizontal surface velocities computed from campaign-style and continuous Global Positioning System (GPS) observations from 1993 to 2003....
Prevalence and spatial distribution of intraerythrocytic parasite(s) in Puget Sound rockfish (Sebastes emphaeus) from the San Juan Archipelago, Washington (USA)
N. Van Der Straaten, A. Jacobson, D. Halos, P. Hershberger, A.A. Kocan, R. Kocan
2005, Journal of Parasitology (91) 980-982
Two morphologically distinct forms of an intraerythrocytic parasite(s) were detected by microscopic observation of Giemsa-stained blood films in 45.7% of 119 rockfish (Sebastes emphaeus) from the San Juan Archipelago (Washington State, U.S.A.). Infection prevalence for both forms was 53% in males, 44% in females, and 33% in fish of undetermined...
Underwater MASW to evaluate stiffness of water-bottom sediments
Choon B. Park, Richard D. Miller, Jianghai Xia, Julian M. Ivanov, G. V. Sonnichsen, James A Hunter, R. L. Good, R. A. Burns, H. Christian
2005, Leading Edge (Tulsa, OK) (24) 724-728
Stiffness measurements are often necessary for geotechnical characterization of an underwater site. Seismically, these measurements can be made through the dispersion analysis of the Rayleigh-type surface waves. Successful terrestrial application of this method has been reported by many investigators using spectral analysis of surface waves (SASW) and more recently using...
On pads and filters: Processing strong-motion data
D.M. Boore
2005, Bulletin of the Seismological Society of America (95) 745-750
Processing of strong-motion data in many cases can be as straightforward as filtering the acceleration time series and integrating to obtain velocity and displacement. To avoid the introduction of spurious low-frequency noise in quantities derived from the filtered accelerations, however, care must be taken to append zero pads of adequate...
Evaluating lek occupancy of greater sage-grouse in relation to landscape cultivation in the Dakotas
Joe T. Smith, Lester D. Flake, Kenneth F. Higgins, Gerald D. Kobriger, Collin G. Homer
2005, Western North American Naturalist (65) 310-320
Greater Sage-Grouse (Centrocercus urophasianus) have been declining in many states and provinces of North America, and North and South Dakota hold no exception to these declines. We studied effects of cultivated land on Greater Sage-Grouse lek abandonment in North and South Dakota. Landscape-level data were assessed using satellite imagery within...
Reconstructing a 180 yr record of natural and anthropogenic induced low-oxygen conditions from Louisiana continental shelf sediments
L.E. Osterman, R.Z. Poore, P.W. Swarzenski, R.E. Turner
2005, Geology (33) 329-332
Hypoxia on the Louisiana continental shelf is tied to nutrient Loading and freshwater stratification from the Mississippi River. Variations in the relative abundance of low-oxygen-tolerant benthic foraminifers in four sediment cores from the Louisiana shelf provide a proxy record of low-oxygen events. Core chronologies are obtained using 210Pb dating techniques....
The distribution of phosphorus in Popes Creek, VA, and in the Pocomoke River, MD: Two watersheds with different land management practices in the Chesapeake Bay Basin
N.S. Simon, O.P. Bricker, W. Newell, J. McCoy, R. Morawe
2005, Water, Air, & Soil Pollution (164) 189-204
This paper compares phosphorus (P) concentrations in sediments from two watersheds, one with, and one without, intensive animal agriculture. The watersheds are in the coastal plain of the Chesapeake Bay and have similar physiographic characteristics. Agriculture in the Pocomoke River, MD, watershed supplied 2.7 percent of all broiler chickens produced...
New standards for reducing gravity data: The North American gravity database
W. J. Hinze, C. Aiken, J. Brozena, B. Coakley, D. Dater, G. Flanagan, R. Forsberg, T. Hildenbrand, Gordon R. Keller, J. Kellogg, R. Kucks, X. Li, A. Mainville, R. Morin, M. Pilkington, D. Plouff, D. Ravat, D. Roman, J. Urrutia-Fucugauchi, M. Veronneau, M. Webring, D. Winester
2005, Geophysics (70)
The North American gravity database as well as databases from Canada, Mexico, and the United States are being revised to improve their coverage, versatility, and accuracy. An important part of this effort is revising procedures for calculating gravity anomalies, taking into account our enhanced computational power, improved terrain databases and...
Pitted cones and domes on Mars: Observations in Acidalia Planitia and Cydonia Mensae using MOC, THEMIS, and TES data
William H. Farrand, Lisa R. Gaddis, Laszlo P. Keszthelyi
2005, Journal of Geophysical Research E: Planets (110) 1-14
Domes and cones with summit pits located in Acidalia Planitia and Cydonia Mensae were studied using MOC and THEMIS images and a TES‐derived thermal inertia map. North of 40.5°N latitude, the features have a dome‐like morphology, and south of that latitude, the morphology is more cone‐like....
Characterizing the spatial structure of endangered species habitat using geostatistical analysis of IKONOS imagery
C.S.A. Wallace, S.E. Marsh
2005, International Journal of Remote Sensing (26) 2607-2629
Our study used geostatistics to extract measures that characterize the spatial structure of vegetated landscapes from satellite imagery for mapping endangered Sonoran pronghorn habitat. Fine spatial resolution IKONOS data provided information at the scale of individual trees or shrubs that permitted analysis of vegetation structure and pattern. We derived images...
