Territoriality of feral pigs in a highly persecuted population on Fort Benning, Georgia
B.D. Sparklin, M.S. Mitchell, L.B. Hanson, D.B. Jolley, S.S. Ditchkoff
2009, Journal of Wildlife Management (73) 497-502
We examined home range behavior of female feral pigs (Sus scrofa) in a heavily hunted population on Fort Benning Military Reservation in west-central Georgia, USA. We used Global Positioning System location data from 24 individuals representing 18 sounders (i.e., F social groups) combined with markrecapture and camera-trap data to evaluate...
Habitat-specific breeder survival of Florida Scrub-Jays: Inferences from multistate models
D.R. Breininger, J.D. Nichols, G.M. Carter, D.M. Oddy
2009, Ecology (90) 3180-3189
Quantifying habitat-specific survival and changes in habitat quality within disturbance-prone habitats is critical for understanding population dynamics and variation in fitness, and for managing degraded ecosystems. We used 18 years of color-banding data and multistate capture-recapture models to test whether habitat quality within territories influences survival and detection probability of...
Analysis of dynamic thresholds for the normalized difference water index
Lei Ji, Li Zhang, Bruce K. Wylie
2009, Photogrammetric Engineering and Remote Sensing (75) 1307-1317
The normalized difference water index (NDWI) has been successfully used to delineate surface water features. However, two major problems have been often encountered: (a) NDWIs calculated from different band combinations [visible, nearinfrared, or shortwave-infrared (SWIR)] can generate different results, and (b) NDWI thresholds vary depending on the proportions of subpixel...
Cataloging the 1811-1812 New Madrid, central U.S., earthquake sequence
S. E. Hough
2009, Seismological Research Letters (80) 1045-1053
The three principal New Madrid, central U.S., mainshocks of 1811-1812 were followed by extensive aftershock sequences that included numerous felt events. Although no instrumental data are available for the sequence, historical accounts provide information that can be used to estimate magnitudes and locations for the large aftershocks as well as...
Unraveling the stratigraphy of the Oriskany Sandstone: A necessity in assessing its site-specific carbon sequestration potential
J. Kostelnik, K.M. Carter
2009, Environmental Geosciences (16) 187-200
The widespread distribution, favorable reservoir characteristics, and depth make the Lower Devonian Oriskany Sandstone a viable sequestration target in the Appalachian Basin. The Oriskany Sandstone is thickest in the structurally complex Ridge and Valley Province, thins toward the northern and western basin margins, and is even absent in other parts...
Seasonal shifts in shelter and microhabitat use of drymarchon couperi (eastern indigo snake) in Georgia
N.L. Hyslop, R.J. Cooper, J.M. Meyers
2009, Copeia (2009) 458-464
Drymarchon couperi (Eastern Indigo Snake), a threatened species of the southeastern Coastal Plain of the United States, has experienced population declines because of extensive habitat loss and degradation across its range. In Georgia and northern Florida, the species is associated with longleaf pine habitats that support Gopherus polyphemus (Gopher Tortoise)...
Constraining earthquake source inversions with GPS data: 2. A two-step approach to combine seismic and geodetic data sets
S. Custodio, M.T. Page, R.J. Archuleta
2009, Journal of Geophysical Research B: Solid Earth (114)
We present a new method to combine static and wavefield data to image earthquake ruptures. Our combined inversion is a two-step procedure, following the work of Hernandez et al. (1999), and takes into account the differences between the resolutions of the two data sets. The first step consists of an...
Spatial and temporal distributions of Martian north polar cold spots before, during, and after the global dust storm of 2001
C. Cornwall, T.N. Titus
2009, Journal of Geophysical Research E: Planets (114)
In the 1970s, Mariner and Viking observed features in the Mars northern polar region that were a few hundred kilometers in diameter with 20 fj,m brightness temperatures as low as 130 K (considerably below C02 ice sublimation temperatures). Over the past decade, studies have shown that these areas (commonly called...
Untangling the biological contributions to soil stability in semiarid shrublands
V. Bala Chaudhary, Matthew A. Bowker, Thomas E. O’Dell, James B. Grace, Andrea E. Redman, Matthias C. Rillig, Nancy C. Johnson
2009, Ecological Applications (19) 110-122
Communities of plants, biological soil crusts (BSCs), and arbuscular mycorrhizal (AM) fungi are known to influence soil stability individually, but their relative contributions, interactions, and combined effects are not well understood, particularly in arid and semiarid ecosystems. In a landscape-scale field study we quantified plant, BSC, and AM fungal communities...
Characterization of phyllosilicates observed in the central Mawrth Vallis region, Mars, their potential formational processes, and implications for past climate
N.K. McKeown, J.L. Bishop, E.Z. Noe Dobrea, B.L. Ehlmann, M. Parente, J.F. Mustard, S.L. Murchie, G.A. Swayze, J.-P. Bibring, E. A. Silver
2009, Journal of Geophysical Research E: Planets (114)
Mawrth Vallis contains one of the largest exposures of phyllosilicates on Mars. Nontronite, montmorillonite, kaolinite, and hydrated silica have been identified throughout the region using data from the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM). In addition, saponite has been identified in one observation within a crater. These individual minerals...
Small-footprint, waveform-resolving lidar estimation of submerged and sub-canopy topography in coastal environments
A. Nayegandhi, J. C. Brock, C. W. Wright
2009, International Journal of Remote Sensing (30) 861-878
The experimental advanced airborne research lidar (EAARL) is an airborne lidar instrument designed to map near-shore submerged topography and adjacent land elevations simultaneously. This study evaluated data acquired by the EAARL system in February 2003 and March 2004 along the margins of Tampa Bay, Florida, USA, to map bare-earth elevations...
Kolmogorov-Smirnov test for spatially correlated data
Ricardo A. Olea, V. Pawlowsky-Glahn
2009, Stochastic Environmental Research and Risk Assessment (23) 749-757
The Kolmogorov-Smirnov test is a convenient method for investigating whether two underlying univariate probability distributions can be regarded as undistinguishable from each other or whether an underlying probability distribution differs from a hypothesized distribution. Application of the test requires that the sample be unbiased and the outcomes be independent and...
Improved constraints on the estimated size and volatile content of the Mount St. Helens magma system from the 2004-2008 history of dome growth and deformation
L.G. Mastin, M. Lisowski, E. Roeloffs, N. Beeler
2009, Geophysical Research Letters (36)
The history of dome growth and geodetic deflation during the 2004-2008 Mount St. Helens eruption can be fit to theoretical curves with parameters such as reservoir volume, bubble content, initial overpressure, and magma rheology, here assumed to be Newtonian viscous, with or without a solid plug in the conduit center....
A calibrated, high-resolution goes satellite solar insolation product for a climatology of Florida evapotranspiration
S.J. Paech, J.R. Mecikalski, D. M. Sumner, C.S. Pathak, Q. Wu, S. Islam, T. Sangoyomi
2009, Journal of the American Water Resources Association (45) 1328-1342
Estimates of incoming solar radiation (insolation) from Geostationary Operational Environmental Satellite observations have been produced for the state of Florida over a 10-year period (1995-2004). These insolation estimates were developed into well-calibrated half-hourly and daily integrated solar insolation fields over the state at 2 km resolution, in addition to a...
Delayed conifer mortality after fuel reduction treatments: Interactive effects of fuel, fire intensity, and bark beetles
A. Youngblood, J.B. Grace, J.D. Mciver
2009, Ecological Applications (19) 321-337
Many low‐elevation dry forests of the western United States contain more small trees and fewer large trees, more down woody debris, and less diverse and vigorous understory plant communities compared to conditions under historical fire regimes. These altered structural conditions may contribute to increased probability of unnaturally severe wildfires, susceptibility...
A less field-intensive robust design for estimating demographic parameters with Mark-resight data
B.T. McClintock, Gary C. White
2009, Ecology (90) 313-320
The robust design has become popular among animal ecologists as a means for estimating population abundance and related demographic parameters with mark-recapture data. However, two drawbacks of traditional mark-recapture are financial cost and repeated disturbance to animals. Mark-resight methodology may in many circumstances be a less expensive and less invasive...
Negligible influence of spatial autocorrelation in the assessment of fire effects in a mixed conifer forest
P. J. van Mantgem, D.W. Schwilk
2009, Fire Ecology (5) 116-125
Fire is an important feature of many forest ecosystems, although the quantification of its effects is compromised by the large scale at which fire occurs and its inherent unpredictability. A recurring problem is the use of subsamples collected within individual burns, potentially resulting in spatially autocorrelated data. Using subsamples from...
Numerical analysis of the performance of rock weirs: Effects of structure configuration on local hydraulics
C. L. Holmquist-Johnson
2009, Conference Paper, Proceedings of World Environmental and Water Resources Congress 2009 - World Environmental and Water Resources Congress 2009: Great Rivers
River spanning rock structures are being constructed for water delivery as well as to enable fish passage at barriers and provide or improve the aquatic habitat for endangered fish species. Current design methods are based upon anecdotal information applicable to a narrow range of channel conditions. The complex flow patterns...
Using "big data" to optimally model hydrology and water quality across expansive regions
E.A. Roehl Jr., J.B. Cook, P.A. Conrads
2009, Conference Paper, Proceedings of World Environmental and Water Resources Congress 2009 - World Environmental and Water Resources Congress 2009: Great Rivers
This paper describes a new divide and conquer approach that leverages big environmental data, utilizing all available categorical and time-series data without subjectivity, to empirically model hydrologic and water-quality behaviors across expansive regions. The approach decomposes large, intractable problems into smaller ones that are optimally solved; decomposes complex signals into...
Russian eruption warning systems for aviation
Christina A. Neal, Olga Girina, Sergey Senyukov, Alexander Rybin, Jeffery M. Osiensky, Pavel Izbekov, Gail Ferguson
2009, Natural Hazards (51) 245-262
More than 65 potentially active volcanoes on the Kamchatka Peninsula and the Kurile Islands pose a substantial threat to aircraft on the Northern Pacific (NOPAC), Russian Trans-East (RTE), and Pacific Organized Track System (PACOTS) air routes. The Kamchatka Volcanic Eruption Response Team (KVERT) monitors and reports on volcanic hazards to...
Tracking magma volume recovery at Okmok Volcano using GPS and an unscented kalman filter
T. Fournier, Jeffrey T. Freymueller, Peter Cervelli
2009, Journal of Geophysical Research B: Solid Earth (114)
Changes beneath a volcano can be observed through position changes in a GPS network, but distinguishing the source of site motion is not always straightforward. The records of continuous GPS sites provide a favorable data set for tracking magma migration. Dense campaign observations usually provide a better spatial picture...
Predicting 21st-century polar bear habitat distribution from global climate models
George M. Durner, David C. Douglas, R. M. Nielson, Steven C. Amstrup, T. L. McDonald, I. Stirling, Mette Mauritzen, E.W. Born, O. Wiig, E. Deweaver, Mark C. Serreze, Stanislav Belikov, M.M. Holland, J. Maslanik, Jon Aars, D.A. Bailey, A.E. Derocher
2009, Ecological Monographs (79) 25-58
Projections of polar bear (Ursus maritimus) sea ice habitat distribution in the polar basin during the 21st century were developed to understand the consequences of anticipated sea ice reductions on polar bear populations. We used location data from satellitecollared polar bears and environmental data (e.g., bathymetry, distance to coastlines, and...
Prediction of spectral acceleration response ordinates based on PGA attenuation
V. Graizer, E. Kalkan
2009, Earthquake Spectra (25) 39-69
Developed herein is a new peak ground acceleration (PGA)-based predictive model for 5% damped pseudospectral acceleration (SA) ordinates of free-field horizontal component of ground motion from shallow-crustal earthquakes. The predictive model of ground motion spectral shape (i.e., normalized spectrum) is generated as a continuous function of few parameters. The proposed...
Water quality of streams in Johnson County, Kansas, 2002-07
T. J. Rasmussen
2009, Conference Paper, Proceedings of World Environmental and Water Resources Congress 2009 - World Environmental and Water Resources Congress 2009: Great Rivers
Water quality of streams in Johnson County, Kansas was evaluated from October 2002 through December 2007 in a cooperative study between the U.S. Geological Survey and the Johnson County Stormwater Management Program. Water quality at 42 stream sites, representing urban and rural basins, was characterized by evaluating benthic macroinvertebrates, water...
Climate, lightning ignitions, and fire severity in Yosemite National Park, California, USA
J.A. Lutz, J. W. van Wagtendonk, A. E. Thode, J.D. Miller, J.F. Franklin
2009, International Journal of Wildland Fire (18) 765-774
Continental-scale studies of western North America have attributed recent increases in annual area burned and fire size to a warming climate, but these studies have focussed on large fires and have left the issues of fire severity and ignition frequency unaddressed. Lightning ignitions, any of which could burn a large...
