Quantile regression applied to spectral distance decay
D. Rocchini, B.S. Cade
2008, IEEE Geoscience and Remote Sensing Letters (5) 640-643
Remotely sensed imagery has long been recognized as a powerful support for characterizing and estimating biodiversity. Spectral distance among sites has proven to be a powerful approach for detecting species composition variability. Regression analysis of species similarity versus spectral distance allows us to quantitatively estimate the amount of turnover in...
Hydroacoustic measures of Mysis relicta abundance and distribution in Lake Ontario
L. G. Rudstam, T. Schaner, G. Gal, B. T. Boscarino, R. O'Gorman, D.M. Warner, O. E. Johannsson, K.L. Bowen
2008, Conference Paper, Aquatic Ecosystem Health and Management
Mysis relicta can be observed on echograms as a sound scattering layer when they migrate into the water column at night to feed on zooplankton. However, quantitative measures of mysid abundance with hydroacoustics requires knowledge of mysid target strength (TS), a method of removing fish echoes and contribution from noise,...
Application of environmental groundwater tracers at the Sulphur Bank Mercury Mine, California, USA
M.A. Engle, F. Goff, D.G. Jewett, G.J. Reller, J.B. Bauman
2008, Hydrogeology Journal (16) 559-573
Boron, chloride, sulfate, ??D, ??18O, and 3H concentrations in surface water and groundwater samples from the Sulphur Bank Mercury Mine (SBMM), California, USA were used to examine geochemical processes and provide constraints on evaporation and groundwater flow. SBMM is an abandoned sulfur and mercury mine with an underlying hydrothermal system,...
A test of the cross-scale resilience model: Functional richness in Mediterranean-climate ecosystems
D.A. Wardwell, Craig R. Allen, G.D. Peterson, A.J. Tyre
2008, Ecological Complexity (5) 165-182
Ecological resilience has been proposed to be generated, in part, in the discontinuous structure of complex systems. Environmental discontinuities are reflected in discontinuous, aggregated animal body mass distributions. Diversity of functional groups within body mass aggregations (scales) and redundancy of functional groups across body mass aggregations (scales) has been proposed...
Observations of the north polar water ice annulus on Mars using THEMIS and TES
Kiri L. Wagstaff, Timothy N. Titus, Anton B. Ivanov, Rebecca Castano, Joshua L. Bandfield
2008, Planetary and Space Science (56) 256-265
The Martian seasonal CO2 ice caps advance and retreat each year. In the spring, as the CO2 cap gradually retreats, it leaves behind an extensive defrosting zone from the solid CO2 cap to the location where all CO2 frost has sublimated. We have been studying this phenomenon in the north...
Evaluating sampling designs by computer simulation: A case study with the Missouri bladderpod
L.W. Morrison, D. R. Smith, C. Young, D.W. Nichols
2008, Population Ecology (50) 417-425
To effectively manage rare populations, accurate monitoring data are critical. Yet many monitoring programs are initiated without careful consideration of whether chosen sampling designs will provide accurate estimates of population parameters. Obtaining accurate estimates is especially difficult when natural variability is high, or limited budgets determine that only a small...
Anatomy of the Chesapeake Bay impact structure revealed by seismic imaging, Delmarva Peninsula, Virginia, USA
R. D. Catchings, D.S. Powars, G. S. Gohn, J. Wright Horton Jr., M. R. Goldman, J.A. Hole
2008, Journal of Geophysical Research B: Solid Earth (113)
A 30-km-long, radial seismic reflection and refraction survey completed across the northern part of the late Eocene Chesapeake Bay impact structure (CBIS) on the Delmarva Peninsula, Virginia, USA, confirms that the CBIS is a complex central-peak crater. We used a tomographic P wave velocity model and low-fold reflection images, constrained...
Using accelerated life testing procedures to compare the relative sensitivity of rainbow trout and the federally listed threatened bull trout to three commonly used rangeland herbicides (picloram, 2,4-D, and clopyralid)
J.F. Fairchild, A. Allert, L.S. Sappington, K.J. Nelson, J. Valle
2008, Environmental Toxicology and Chemistry (27) 623-630
We conducted 96-h static acute toxicity studies to evaluate the relative sensitivity of juveniles of the threatened bull trout (Salvelinus confluentus) and the standard cold-water surrogate rainbow trout (Onchorhyncus mykiss) to three rangeland herbicides commonly used for controlling invasive weeds in the northwestern United States. Relative species sensitivity was compared...
Identifying mangrove species and their surrounding land use and land cover classes using object-oriented approach with a lacunarity spatial measure
S.W. Myint, C.P. Giri, L. Wang, Z. Zhu, S.C. Gillete
2008, GIScience and Remote Sensing (45) 188-208
Accurate and reliable information on the spatial distribution of mangrove species is needed for a wide variety of applications, including sustainable management of mangrove forests, conservation and reserve planning, ecological and biogeographical studies, and invasive species management. Remotely sensed data have been used for such purposes with mixed results. Our...
M-log A observations for recent large earthquakes
Thomas C. Hanks, W. H. Bakun
2008, Bulletin of the Seismological Society of America (98) 490-494
Using a magnitude (M)-log area (A) dataset augmented with seven large (M > 7.0) earthquakes occurring since Wells and Coppersmith (1994), this short note assesses the current validity of the bilinear M-log A relations for continental, strike-slip earthquakes proposed by Hanks and Bakun (2002), in particular the L-model scaling at...
Surface drift prediction in the Adriatic Sea using hyper-ensemble statistics on atmospheric, ocean and wave models: Uncertainties and probability distribution areas
M. Rixen, E. Ferreira-Coelho, R. Signell
2008, Journal of Marine Systems (69) 86-98
Despite numerous and regular improvements in underlying models, surface drift prediction in the ocean remains a challenging task because of our yet limited understanding of all processes involved. Hence, deterministic approaches to the problem are often limited by empirical assumptions on underlying physics. Multi-model hyper-ensemble forecasts, which exploit the power...
Longitudinal gradients along a reservoir cascade
L.E. Miranda, M.D. Habrat, S. Miyazono
2008, Transactions of the American Fisheries Society (137) 1851-1865
Reservoirs have traditionally been regarded as spatially independent entities rather than as longitudinal segments of a river system that are connected upstream and downstream to the river and other reservoirs. This view has frustrated advancement in reservoir science by impeding adequate organization of available information and by hindering interchanges with...
Greenland ice sheet surface temperature, melt and mass loss: 2000-06
D.K. Hall, R.S. Williams Jr., S.B. Luthcke, N.E. DiGirolamo
2008, Journal of Glaciology (54) 81-93
A daily time series of 'clear-sky' surface temperature has been compiled of the Greenland ice sheet (GIS) using 1 km resolution moderate-resolution imaging spectroradiometer (MODIS) land-surface temperature (LST) maps from 2000 to 2006. We also used mass-concentration data from the Gravity Recovery and Climate Experiment (GRACE) to study mass change...
Chromium, chromium isotopes and selected trace elements, western Mojave Desert, USA
J. A. Izbicki, J.W. Ball, T.D. Bullen, S. J. Sutley
2008, Applied Geochemistry (23) 1325-1352
Chromium(VI) concentrations in excess of the California Maximum Contaminant Level (MCL) of 50 μg/L occur naturally in alkaline, oxic ground-water in alluvial aquifers in the western Mojave Desert, southern California. The highest concentrations were measured in aquifers eroded from mafic rock, but Cr(VI)...
Joint inversion of fundamental and higher mode Rayleigh waves
Y.-H. Luo, J.-H. Xia, J.-P. Liu, Q.-S. Liu
2008, Chinese Journal of Geophysics (Acta Geophysica Sinica) (51) 242-249
In this paper, we analyze the characteristics of the phase velocity of fundamental and higher mode Rayleigh waves in a six-layer earth model. The results show that fundamental mode is more sensitive to the shear velocities of shallow layers (< 7 m) and concentrated in a very narrow band (around...
An overview of methods for developing bioenergetic and life history models for rare and endangered species
J.H. Petersen, D.L. DeAngelis, C.P. Paukert
2008, Transactions of the American Fisheries Society (137) 244-253
Many fish species are at risk to some degree, and conservation efforts are planned or underway to preserve sensitive populations. For many imperiled species, models could serve as useful tools for researchers and managers as they seek to understand individual growth, quantify predator-prey dynamics, and identify critical sources of mortality....
De-convoluting mixed crude oil in Prudhoe Bay Field, North Slope, Alaska
K. E. Peters, Ramos L. Scott, J.E. Zumberge, Z. C. Valin, K. J. Bird
2008, Organic Geochemistry (39) 623-645
Seventy-four crude oil samples from the Barrow arch on the North Slope of Alaska were studied to assess the relative volumetric contributions from different source rocks to the giant Prudhoe Bay Field. We applied alternating least squares to concentration data (ALS-C) for 46 biomarkers in the range C19-C35 to de-convolute...
Comparison of remote sensing image processing techniques to identify tornado damage areas from Landsat TM data
S.W. Myint, M. Yuan, R.S. Cerveny, C.P. Giri
2008, Sensors (8) 1128-1156
Remote sensing techniques have been shown effective for large-scale damage surveys after a hazardous event in both near real-time or post-event analyses. The paper aims to compare accuracy of common imaging processing techniques to detect tornado damage tracks from Landsat TM data. We employed the direct change detection approach using...
Using demography and movement behavior to predict range expansion of the southern sea otter.
M. T. Tinker, D.F. Doak, J. A. Estes
2008, Ecological Applications (18) 1781-1794
In addition to forecasting population growth, basic demographic data combined with movement data provide a means for predicting rates of range expansion. Quantitative models of range expansion have rarely been applied to large vertebrates, although such tools could be useful for restoration and management of many threatened but recovering populations....
Aseismic slip and fault-normal strain along the central creeping section of the San Andreas fault
F. Rolandone, R. Burgmann, D.C. Agnew, I.A. Johanson, D.C. Templeton, M. A. d'Alessio, S.J. Titus, C. DeMets, B. Tikoff
2008, Geophysical Research Letters (35)
We use GPS data to measure the aseismic slip along the central San Andreas fault (CSAF) and the deformation across adjacent faults. Comparison of EDM and GPS data sets implies that, except for small-scale transients, the fault motion has been steady over the last 40 years. We add 42 new...
Western juniper and ponderosa pine ecotonal climate-growth relationships across landscape gradients in southern Oregon
K.C. Knutson, D.A. Pyke
2008, Canadian Journal of Forest Research (38) 3021-3032
Forecasts of climate change for the Pacific northwestern United States predict warmer temperatures, increased winter precipitation, and drier summers. Prediction of forest growth responses to these climate fluctuations requires identification of climatic variables limiting tree growth, particularly at limits of free species distributions. We addressed this problem at the pine-woodland...
Estimating watershed level nonagricultural pesticide use from golf courses using geospatial methods
G.A. Fox, G.P. Thelin, G.J. Sabbagh, J.W. Fuchs, I.D. Kelly
2008, Journal of the American Water Resources Association (44) 1363-1372
Limited information exists on pesticide use for nonagricultural purposes, making it difficult to estimate pesticide loadings from nonagricultural sources to surface water and to conduct environmental risk assessments. A method was developed to estimate the amount of pesticide use on recreational turf grasses, specifically golf course turf grasses, for watersheds...
Micropaleontologic record of late Pliocene and Quaternary paleoenvironments in the northern Albemarle Embayment, North Carolina, U.S.A.
S.J. Culver, K.M. Farrell, D. J. Mallinson, B. P. Horton, Debra A. Willard, E.R. Thieler, S.R. Riggs, S.W. Snyder, J.F. Wehmiller, C.E. Bernhardt, C. Hillier
2008, Palaeogeography, Palaeoclimatology, Palaeoecology (264) 54-77
Micropaleontological data provide a strong actualistic basis for detailed interpretations of Quaternary paleoenvironmental change. The 90 m-thick Quaternary record of the Albemarle Embayment in the mid-Atlantic coastal plain of the USA provides an excellent opportunity to use such an approach in a region where the details of Quaternary environmental change are...
Demography and movement in a relocated population of Oregon Spotted Frogs (Rana pretiosa): Influence of season and gender
N.D. Chelgren, C.A. Pearl, M.J. Adams, J. Bowerman
2008, Copeia 742-751
We used five years of recapture data and Bayesian estimation to assess seasonal survival, movement, and growth of Oregon Spotted Frogs (Rana pretiosa) relocated into created ponds at Dilman Meadow in Oregon, USA. We evaluate hypotheses specific to the relocation and elucidate aspects of R. pretiosa life history that are...
Ontology-based geospatial data query and integration
T. Zhao, C. Zhang, M. Wei, Z.-R. Peng
2008, Conference Paper
Geospatial data sharing is an increasingly important subject as large amount of data is produced by a variety of sources, stored in incompatible formats, and accessible through different GIS applications. Past efforts to enable sharing have produced standardized data format such as GML and data access protocols such as Web...
