Digital hydrologic networks supporting applications related to spatially referenced regression modeling
J. W. Brakebill, D.M. Wolock, S.E. Terziotti
2011, Journal of the American Water Resources Association (47) 916-932
Digital hydrologic networks depicting surface‐water pathways and their associated drainage catchments provide a key component to hydrologic analysis and modeling. Collectively, they form common spatial units that can be used to frame the descriptions of aquatic and watershed processes. In addition, they provide the ability to simulate and route the...
Scented guide ropes as a method to enhance brown treesnake (Boiga irregularis) trap capture success on Guam
L.C. Mason, J. A. Savidge, G.H. Rodda, A. A. Yackel Adams
2011, Journal of Herpetology (45) 308-312
Current methods for controlling the invasive Brown Treesnake (Boiga irregularis) on Guam include a modified minnow trap with a live mouse lure. We investigated the effects on capture success of augmenting these traps with scented guide ropes leading to trap entrances. Initial screening of scent preferences was based on...
Bias-adjusted satellite-based rainfall estimates for predicting floods: Narayani Basin
M.S. Shrestha, G. A. Artan, S.R. Bajracharya, D.K. Gautam, S.A. Tokar
2011, Journal of Flood Risk Management (4) 360-373
In Nepal, as the spatial distribution of rain gauges is not sufficient to provide detailed perspective on the highly varied spatial nature of rainfall, satellite‐based rainfall estimates provides the opportunity for timely estimation. This paper presents the flood prediction of Narayani Basin at the Devghat hydrometric station (32 000 km2) using bias‐adjusted...
Pressure waves in a supersaturated bubbly magma
I. Kurzon, V. Lyakhovsky, O. Navon, B. Chouet
2011, Geophysical Journal International (187) 421-438
We study the interaction of acoustic pressure waves with an expanding bubbly magma. The expansion of magma is the result of bubble growth during or following magma decompression and leads to two competing processes that affect pressure waves. On the one hand, growth in vesicularity leads to increased damping and...
Evaluating gull diets: A comparison of conventional methods and stable isotope analysis
Emily L. Weiser, Abby N. Powell
2011, Journal of Field Ornithology (82) 297-310
Samples such as regurgitated pellets and food remains have traditionally been used in studies of bird diets, but these can produce biased estimates depending on the digestibility of different foods. Stable isotope analysis has been developed as a method for assessing bird diets that is not biased by digestibility. These...
Response of spectral vegetation indices to soil moisture in grasslands and shrublands
Li Zhang, Lei Ji, Bruce K. Wylie
2011, International Journal of Remote Sensing (32) 5267-5286
The relationships between satellite-derived vegetation indices (VIs) and soil moisture are complicated because of the time lag of the vegetation response to soil moisture. In this study, we used a distributed lag regression model to evaluate the lag responses of VIs to soil moisture for grasslands and shrublands at Soil...
Sex effect on polychlorinated biphenyl concentrations in fish: a synthesis
C.P. Madenjian
2011, Fish and Fisheries (12) 451-460
Polychlorinated biphenyls (PCBs) accumulate in fish primarily via food intake, and therefore, PCBs serve as a chemical tracer for food consumption. Sex differences in PCB concentrations of fish have been attributed to the following three mechanisms: (i) females losing a substantial portion of their PCB body burden during spawning and...
Potential shifts in dominant forest cover in interior Alaska driven by variations in fire severity
K. Barrett, A. David McGuire, E.E. Hoy, E.S. Kasischke
2011, Ecological Applications (21) 2380-2396
Large fire years in which >1% of the landscape burns are becoming more frequent in the Alaskan (USA) interior, with four large fire years in the past 10 years, and 79 000 km2 (17% of the region) burned since 2000. We modeled fire severity conditions for the entire area burned in large...
A multi-agency nutrient dataset used to estimate loads, improve monitoring design, and calibrate regional nutrient SPARROW models
D. A. Saad, G. E. Schwarz, Dale M. Robertson, N.L. Booth
2011, Journal of the American Water Resources Association (47) 933-949
Stream‐loading information was compiled from federal, state, and local agencies, and selected universities as part of an effort to develop regional SPAtially Referenced Regressions On Watershed attributes (SPARROW) models to help describe the distribution, sources, and transport of nutrients in streams throughout much of the United States. After screening, 2,739...
Homogenization of large-scale movement models in ecology
M.J. Garlick, J. A. Powell, M.B. Hooten, L.R. McFarlane
2011, Bulletin of Mathematical Biology (73) 2088-2108
A difficulty in using diffusion models to predict large scale animal population dispersal is that individuals move differently based on local information (as opposed to gradients) in differing habitat types. This can be accommodated by using ecological diffusion. However, real environments are often spatially complex, limiting application of a direct...
Female white-tailed deer survival across ecoregions in Minnesota and South Dakota
T.W. Grovenburg, C. C. Swanson, C.N. Jacques, C.S. Deperno, R. W. Klaver, J.A. Jenks
2011, American Midland Naturalist (165) 426-435
Survival and cause-specific mortality of female white-tailed deer (Odocoileus virginianus) have been well documented in forested and agricultural landscapes, but limited information has been collected in grassland habitats typical of the Northern Great Plains. Our objectives were to document and compare survival and cause-specific mortality of adult female white-tailed deer...
Overpressure generation by load transfer following shale framework weakening due to smectite diagenesis
R.W. Lahann, R.E. Swarbrick
2011, Geofluids (11) 362-375
Basin model studies which have addressed the importance of smectite conversion to illite as a source of overpressure in the Gulf of Mexico have principally relied on a single‐shale compaction model and treated the smectite reaction as only a fluid‐source term. Recent fluid pressure interpretation and shale petrology studies indicate...
Surface-water nutrient conditions and sources in the United States Pacific Northwest
D.R. Wise, H.M. Johnson
2011, Journal of the American Water Resources Association (47) 1110-1135
The SPAtially Referenced Regressions On Watershed attributes (SPARROW) model was used to perform an assessment of surface-water nutrient conditions and to identify important nutrient sources in watersheds of the Pacific Northwest region of the United States (U.S.) for the year 2002. Our models included variables representing nutrient sources as well...
A working environment for digital planetary data processing and mapping using ISIS and GRASS GIS
A. Frigeri, T. Hare, M. Neteler, A. Coradini, C. Federico, R. Orosei
2011, Conference Paper, Planetary and Space Science
Since the beginning of planetary exploration, mapping has been fundamental to summarize observations returned by scientific missions. Sensor-based mapping has been used to highlight specific features from the planetary surfaces by means of processing. Interpretative mapping makes use of instrumental observations to produce thematic maps that summarize observations of actual...
Titan's cloud seasonal activity from winter to spring with Cassini/VIMS
S. Rodriguez, S. Le Mouelic, P. Rannou, Christophe Sotin, R. H. Brown, J. W. Barnes, C.A. Griffith, J. Burgalat, K. H. Baines, B. J. Buratti, R. N. Clark, P. D. Nicholson
2011, Icarus (216) 89-110
Since Saturn orbital insertion in July 2004, the Cassini orbiter has been observing Titan throughout most of the northern winter season (October 2002–August 2009) and the beginning of spring, allowing a detailed monitoring of Titan’s cloud coverage at high spatial resolution with close flybys on a monthly basis. This...
Ecosystem development in roadside grasslands: Biotic control, plant-soil interactions, and dispersal limitations
P. Garcia-Palacios, M. A. Bowker, F.T. Maestre, S. Soliveres, F. Valladares, J. Papadopoulos, A. Escudero
2011, Ecological Applications (21) 2806-2821
Roadside grasslands undergoing secondary succession are abundant, and represent ecologically meaningful examples of novel, human‐created ecosystems. Interactions between plant and soil communities (hereafter plant–soil interactions) are of major importance in understanding the role of biotic control in ecosystem functioning, but little is known about these links in the context of...
Predicting carnivore occurrence with noninvasive surveys and occupancy modeling
Robert A. Long, Therese M. Donovan, Paula MacKay, William J. Zielinski, Jeffrey S. Buzas
2011, Landscape Ecology (26) 327-340
Terrestrial carnivores typically have large home ranges and exist at low population densities, thus presenting challenges to wildlife researchers. We employed multiple, noninvasive survey methods—scat detection dogs, remote cameras, and hair snares—to collect detection–nondetection data for elusive American black bears (Ursus americanus), fishers (Martes pennanti), and bobcats (<i...
Self-potential investigations of a gravel bar in a restored river corridor
N. Linde, J. Doetsch, D. Jougnot, O. Genoni, Y. Durst, B. J. Minsley, T. Vogt, N. Pasquale, J. Luster
2011, Hydrology and Earth System Sciences (15) 729-742
Self-potentials (SP) are sensitive to water fluxes and concentration gradients in both saturated and unsaturated geological media, but quantitative interpretations of SP field data may often be hindered by the superposition of different source contributions and time-varying electrode potentials. Self-potential mapping and close to two months of SP monitoring on...
Integration of Palmer Drought Severity Index and remote sensing data to simulate wetland water surface from 1910 to 2009 in Cottonwood Lake area, North Dakota
Shengli Huang, Devendra Dahal, Claudia Young, Gyanesh Chander, Shuguang Liu
2011, Remote Sensing of Environment (115) 3377-3389
Spatiotemporal variations of wetland water in the Prairie Pothole Region are controlled by many factors; two of them are temperature and precipitation that form the basis of the Palmer Drought Severity Index (PDSI). Taking the 196 km2 Cottonwood Lake area in North Dakota as our pilot study site, we integrated PDSI, Landsat...
Quantifying the hydrological responses to climate change in an intact forested small watershed in Southern China
G. Zhou, X. Wei, Y. Wu, Y. Huang, J. Yan, Dongxiao Zhang, Q. Zhang, J. Liu, Z. Meng, C. Wang, G. Chu, S. Liu, X. Tang, Xiuying Liu
2011, Global Change Biology (17) 3736-3746
Responses of hydrological processes to climate change are key components in the Intergovernmental Panel for Climate Change (IPCC) assessment. Understanding these responses is critical for developing appropriate mitigation and adaptation strategies for sustainable water resources management and protection of public safety. However, these responses are not well understood and little...
Distinguishing between stress-induced and structural anisotropy at Mount Ruapehu volcano, New Zealand
J. H. Johnson, M.K. Savage, J. Townend
2011, Journal of Geophysical Research B: Solid Earth (116)
We have created a benchmark of spatial variations in shear wave anisotropy around Mount Ruapehu, New Zealand, against which to measure future temporal changes. Anisotropy in the crust is often assumed to be caused by stress-aligned microcracks, and the polarization of the...
High-frequency Born synthetic seismograms based on coupled normal modes
F. Pollitz
2011, Geophysical Journal International (187) 1420-1442
High-frequency and full waveform synthetic seismograms on a 3-D laterally heterogeneous earth model are simulated using the theory of coupled normal modes. The set of coupled integral equations that describe the 3-D response are simplified into a set of uncoupled integral equations by using the Born approximation to calculate scattered...
Nearshore Tsunami Inundation Model Validation: Toward Sediment Transport Applications
Alex Apotsos, Mark Buckley, Guy Gelfenbaum, Bruce Jaffe, Deepak Vatvani
2011, Pure and Applied Geophysics (168) 2097-2119
Model predictions from a numerical model, Delft3D, based on the nonlinear shallow water equations are compared with analytical results and laboratory observations from seven tsunami-like benchmark experiments, and with field observations from the 26 December 2004 Indian Ocean tsunami. The model accurately predicts the magnitude and timing of the measured...
Expansion rate and geometry of floating vegetation mats on the margins of thermokarst lakes, northern Seward Peninsula, Alaska, USA
A.D. Parsekian, Benjamin M. Jones, M. Jones, G. Grosse, Anthony K.M. Walter, L. Slater
2011, Earth Surface Processes and Landforms (36) 1889-1897
Investigations on the northern Seward Peninsula in Alaska identified zones of recent (<50 years) permafrost collapse that led to the formation of floating vegetation mats along thermokarst lake margins. The occurrence of floating vegetation mat features indicates rapid degradation of near‐surface permafrost and lake expansion. This paper reports on the recent...
Threshold responses of songbirds to long-term timber management on an active industrial forest
Douglas A. Becker, Petra Bohall Wood, Patrick D. Keyser, T. Bently Wigley, Rachel Dellinger, Cathy A. Weakland
2011, Forest Ecology and Management (262) 449-460
Forest managers often seek to balance economic benefits from timber harvesting with maintenance of habitat for wildlife, ecosystem function, and human uses. Most research on the relationship between avian abundance and active timber management has been short-term, lasting one to two years, creating the need to investigate long-term avian responses...
