The impact of medium architecture of alluvial settings on non-Fickian transport
Yong Zhang, Christopher T. Green, Graham E. Fogg
2013, Advances in Water Resources (54) 78-99
The influence of heterogeneous architecture of alluvial aquifers on non-Fickian transport is explored using the Monte Carlo approach. More than two thousand high-resolution hydrofacies models representing seven groups of alluvial settings are built to test the effects of varying facies proportions, mean length and its anisotropy ratio, juxtapositional tendencies, and...
Influence of drought on salamander occupancy of isolated wetlands on the southeastern Coastal Plain of the United States
Susan C. Walls, William J. Barichivich, Mary E. Brown, David E. Scott, Blake R. Hossack
2013, Wetlands (33) 345-354
In the southeastern U.S., changes in temperature and precipitation over the last three decades have been the most dramatic in winter and spring seasons. Continuation of these trends could negatively impact pond-breeding amphibians, especially those that rely on winter and spring rains to fill seasonal wetlands, trigger breeding, and ensure...
Structure and tectonic evolution of the eastern Española Basin, Rio Grande rift, north-central New Mexico
Daniel Koning, V. J. Grauch, Sean D. Connell, J. Ferguson, William McIntosh, Janet L. Slate, Elmira Wan, W.S. Baldridge
2013, Book chapter, New perspectives on Rio Grande Rift Basins: From tectonics to groundwater
We describe the structure of the eastern Española Basin and use stratigraphic and stratal attitude data to interpret its tectonic development. This area consists of a west-dipping half graben in the northern Rio Grande rift that includes several intrabasinal grabens, faults, and folds. The Embudo–Santa Clara–Pajarito fault system, a collection...
Selection of hyperspectral narrowbands (HNBs) and composition of hyperspectral twoband vegetation indices (HVIs) for biophysical characterization and discrimination of crop types using field reflectance and Hyperion/EO-1 data
P.S. Thenkabail, I. Mariotto, M.K. Gumma, E.M. Middleton, D.R. Landis, K.F. Huemmrich
2013, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing (6) 427-439
The overarching goal of this study was to establish optimal hyperspectral vegetation indices (HVIs) and hyperspectral narrowbands (HNBs) that best characterize, classify, model, and map the world's main agricultural crops. The primary objectives were: (1) crop biophysical modeling through HNBs and HVIs, (2) accuracy assessment of crop type discrimination using...
Vegetation greenness trend (2000 to 2009) and the climate controls in the Qinghai-Tibetan Plateau
Li Zhang, Huadong Guo, Lei Ji, Liping Lei, Cuizhen Wang, Dongmei Yan, Bin Li, Jing Li
2013, Journal of Applied Remote Sensing (7)
The Qinghai-Tibetan Plateau has been experiencing a distinct warming trend, and climate warming has a direct and quick impact on the alpine grassland ecosystem. We detected the greenness trend of the grasslands in the plateau using Moderate Resolution Imaging Spectroradiometer data from 2000 to 2009. Weather station data were used...
Use of NMR logging to obtain estimates of hydraulic conductivity in the High Plains aquifer, Nebraska, USA
Katherine Dlubac, Rosemary Knight, Yi-Qiao Song, Nate Bachman, Ben Grau, Jim Cannia, John Williams
2013, Water Resources Research (49) 1871-1886
Hydraulic conductivity (K) is one of the most important parameters of interest in groundwater applications because it quantifies the ease with which water can flow through an aquifer material. Hydraulic conductivity is typically measured by conducting aquifer tests or wellbore flow (WBF) logging. Of interest in our research is the...
EO-1 Hyperion reflectance time series at calibration and validation sites: stability and sensitivity to seasonal dynamics
P.K.E. Campbell, E.M. Middleton, K. J. Thome, Raymond F. Kokaly, K.F. Huemmrich, K.A. Novick, N.A. Brunsell
2013, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing (6) 276-290
This study evaluated Earth Observing 1 (EO-1) Hyperion reflectance time series at established calibration sites to assess the instrument stability and suitability for monitoring vegetation functional parameters. Our analysis using three pseudo-invariant calibration sites in North America indicated that the reflectance time series are devoid of apparent spectral trends and...
Effects of hydrologic connectivity and environmental nariables on nekton assemblage in a coastal marsh system
Sung-Ryong Kang, Sammy L. King
2013, Wetlands (33) 321-334
Hydrologic connectivity and environmental variation can influence nekton assemblages in coastal ecosystems. We evaluated the effects of hydrologic connectivity (permanently connected pond: PCP; temporary connected pond: TCP), salinity, vegetation coverage, water depth and other environmental variables on seasonal nekton assemblages in freshwater, brackish, and saline marshes of the Chenier Plain,...
Regulation of gonadal sex ratios and pubertal development by the thyroid endocrine system in zebrafish (Danio rerio)
Prakash Sharma, Reynaldo Patino
2013, General and Comparative Endocrinology (184) 111-119
We examined associations between thyroid condition, gonadal sex and pubertal development in zebrafish. Seventy-two-hour postfertilization larvae were reared in untreated medium or in the presence of goitrogens (sodium perchlorate, 0.82 mM; methimazole, 0.15 and 0.3 mM) or thyroxine (1 and 10 nM) for 30 days. Thyrocyte height, gonadal sex and...
Geochemistry, petrography, and zircon U-Pb geochronology of Paleozoic metaigneous rocks in the Mount Veta area of east-central Alaska: implications for the evolution of the westernmost part of the Yukon-Tanana terrane
Cynthia Dusel-Bacon, Warren C. Day, John N. Aleinikoff
2013, Canadian Journal of Earth Sciences (50) 826-846
We report the results of new mapping, whole-rock major, minor, and trace-element geochemistry, and petrography for metaigneous rocks from the Mount Veta area in the westernmost part of the allochthonous Yukon–Tanana terrane (YTT) in east-central Alaska. These rocks include tonalitic mylonite gneiss and mafic metaigneous rocks from the Chicken metamorphic...
Spatial variability of the response to climate change in regional groundwater systems -- examples from simulations in the Deschutes Basin, Oregon
Michael S. Waibel, Marshall W. Gannett, Heejun Chang, Christina L. Hulbe
2013, Journal of Hydrology (486) 187-201
We examine the spatial variability of the response of aquifer systems to climate change in and adjacent to the Cascade Range volcanic arc in the Deschutes Basin, Oregon using downscaled global climate model projections to drive surface hydrologic process and groundwater flow models. Projected warming over the 21st century is...
Statistical classification of vegetation and water depths in montane wetlands
Julia L. Sharp, Richard S. Sodja, Mark Greenwood, Donald O. Rosenberry, Jeffrey M. Warren
2013, Ecohydrology (6) 173-181
Relationships between water depths and density of submergent vegetation were studied in montane wetlands using statistical techniques based on clustering and an extension of regression trees. Sago pondweed (Stuckenia pectinata) was associated with lower average water depths than water milfoil (Myriophyllum sibiricum). We detected a nonlinear relationship when average water...
Conditional spectrum computation incorporating multiple causal earthquakes and ground-motion prediction models
Ting Lin, Stephen C. Harmsen, Jack W. Baker, Nicolas Luco
2013, Bulletin of the Seismological Society of America (103) 1103-1116
The conditional spectrum (CS) is a target spectrum (with conditional mean and conditional standard deviation) that links seismic hazard information with ground-motion selection for nonlinear dynamic analysis. Probabilistic seismic hazard analysis (PSHA) estimates the ground-motion hazard by incorporating the aleatory uncertainties in all earthquake scenarios and resulting ground motions, as...
Acute sedimentation response to rainfall following the explosive phase of the 2008-2009 eruption of Chaitén volcano, Chile
Thomas C. Pierson, Jon J. Major, Álvaro Amigo, Hugo Moreno
2013, Bulletin of Volcanology (75)
The 10-day explosive phase at the start of the 2008–2009 eruption of Chaitén volcano in southern Chile (42.83°S, 72.65°W) blanketed the steep, rain-forest-cloaked, 77-km2 Chaitén River drainage basin with 3 to >100 cm of tephra; predominantly fine to extremely fine rhyolitic ash fell during the latter half of the explosive...
Symposium 9: Rocky Mountain futures: preserving, utilizing, and sustaining Rocky Mountain ecosystems
Jill S. Baron, Timothy Seastedt, Daniel B. Fagre, Jeffrey A. Hicke, Diana Tomback, Elizabeth Garcia, Zachary H. Bowen, Jesse A. Logan
2013, Bulletin of the Ecological Society of America (94) 195-199
In 2002 we published Rocky Mountain Futures, an Ecological Perspective (Island Press) to examine the cumulative ecological effects of human activity in the Rocky Mountains. We concluded that multiple local activities concerning land use, hydrologic manipulation, and resource extraction have altered ecosystems, although there were examples where the “tyranny...
Survival of fledgling ovenbirds: Influences of habitat characteristics at multiple spatial scales
Henry M. Streby, David E. Andersen
2013, The Condor (115) 403-410
Significance of exchanging SSURGO and STATSGO data when modeling hydrology in diverse physiographic terranes
Tanja N. Williamson, Charles J. Taylor, Jeremy K. Newson
2013, Soil Science Society of America Journal (77) 877-889
The Water Availability Tool for Environmental Resources (WATER) is a TOPMODEL-based hydrologic model that depends on spatially accurate soils data to function in diverse terranes. In Kentucky, this includes mountainous regions, karstic plateau, and alluvial plains. Soils data are critical because they quantify the space to store water, as well...
Aeolian controls of soil geochemistry and weathering fluxes in high-elevation ecosystems of the Rocky Mountains, Colorado
Corey R. Lawrence, Richard L. Reynolds, Michael E. Kettterer, Jason C. Neff
2013, Geochimica et Cosmochimica Acta (107) 27-46
When dust inputs are large or have persisted for long periods of time, the signature of dust additions are often apparent in soils. The of dust will be greatest where the geochemical composition of dust is distinct from local sources of soil parent material. In this study the influence of...
Estimation of submarine mass failure probability from a sequence of deposits with age dates
Eric L. Geist, Jason D. Chaytor, Thomas E. Parsons, Uri S. ten Brink
2013, Geosphere (9) 287-298
The empirical probability of submarine mass failure is quantified from a sequence of dated mass-transport deposits. Several different techniques are described to estimate the parameters for a suite of candidate probability models. The techniques, previously developed for analyzing paleoseismic data, include maximum likelihood and Type II (Bayesian) maximum likelihood methods...
Nature's Notebook 2012: State of the data
Jherime Kellermann, T.M. Crimmins, E.G. Denny, C.A.F. Enquist, K.L. Gerst, A.H. Rosemartin, Jake F. Weltzin
2013, USA-NPN Technical Series 2013-001
In 2012, 2,045 observers contributed 1,592 sites to the NPDb, encompassing all 50 states, the U.S. Virgin Islands, and Puerto Rico. At the close of 2012 the NPDb contained a total of over 1.6 million phenophase status records. More than half of these records were submitted in 2012. Observers submitted records on 547...
Omnivory and the terrestrial food web: Yellowstone grizzly beard diets
Charles C. Schwartz, Mark A. Haroldson, Kerry A. Gunther, Charles T. Robbins
2013, Book chapter, Yellowstone’s wildlife in transition
No abstract available....
Influences of riparian vegetation on trout stream temperatures in central Wisconsin
Benjamin K. Cross, Michael A. Bozek, Matthew G. Mitro
2013, North American Journal of Fisheries Management (33) 682-692
Summer stream temperatures limit the distribution of Brook Trout Salvelinus fontinalis and are affected by riparian vegetation. We used riparian and instream habitat surveys along with stream temperature loggers placed throughout streams to determine the potential for riparian vegetation shading to increase the length of stream that is thermally suitable for Brook...
A refined index of model performance: a rejoinder
David R. Legates, Gregory J. McCabe
2013, International Journal of Climatology (33) 1053-1056
Willmott et al. [Willmott CJ, Robeson SM, Matsuura K. 2012. A refined index of model performance. International Journal of Climatology, forthcoming. DOI:10.1002/joc.2419.] recently suggest a refined index of model performance (dr) that they purport to be superior to other methods. Their refined index ranges from − 1.0 to 1.0 to resemble a correlation...
How do migratory species add ecosystem service value to wilderness? Calculating the spatial subsidies provided by protected areas
Laura Lopez-Hoffman, Darius J. Semmens, Jay Diffendorfer
2013, International Journal of Wilderness (19) 14-19
Species that migrate through protected and wilderness areas and utilize their resources, deliver ecosystem services to people in faraway locations. The mismatch between the areas that most support a species and those areas where the species provides most benefits to society can lead to underestimation of the true value of...
Population ecology of polar bears in Davis Strait, Canada and Greenland
Elizabeth L. Peacock, Mitchell K. Taylor, Jeffrey L. Laake, Ian Stirling
2013, Journal of Wildlife Management (77) 463-476
Until recently, the sea ice habitat of polar bears was understood to be variable, but environmental variability was considered to be cyclic or random, rather than progressive. Harvested populations were believed to be at levels where density effects were considered not significant. However, because we now understand that polar bear...
