The 3D Elevation Program: summary for Texas
William J. Carswell Jr.
2013, Fact Sheet 2013-3097
Elevation data are essential to a broad range of applications, including forest resources management, wildlife and habitat management, national security, recreation, and many others. For the State of Texas, elevation data are critical for natural resources conservation; wildfire management, planning, and response; flood risk management; agriculture and precision farming; infrastructure...
Geologic map of the Washougal quadrangle, Clark County, Washington, and Multnomah County, Oregon
Russell C. Evarts, Jim E. O'Connor, Terry L. Tolan
2013, Scientific Investigations Map 3257
The Washougal 7.5’ quadrangle spans the boundary between the Portland Basin and the Columbia River Gorge, approximately 30 km east of Portland, Oregon. The map area contains the westernmost portion of the Columbia River Gorge National Scenic area as well as the rapidly growing areas surrounding the Clark County, Washington,...
Bayes and empirical Bayes estimators of abundance and density from spatial capture-recapture data
Robert M. Dorazio
2013, PLoS ONE (8)
In capture-recapture and mark-resight surveys, movements of individuals both within and between sampling periods can alter the susceptibility of individuals to detection over the region of sampling. In these circumstances spatially explicit capture-recapture (SECR) models, which incorporate the observed locations of individuals, allow population density and abundance to be estimated...
Classification of freshwater ice conditions on the Alaskan Arctic Coastal Plain using ground penetrating radar and TerraSAR-X satellite data
Benjamin M. Jones, Alessio Gusmeroli, Christopher D. Arp, Tazio Strozzi, Guido Grosse, Benjamin V. Gaglioti, Matthew S. Whitman
2013, International Journal of Remote Sensing (34) 8267-8279
Arctic freshwater ecosystems have responded rapidly to climatic changes over the last half century. Lakes and rivers are experiencing a thinning of the seasonal ice cover, which may increase potential over-wintering freshwater habitat, winter water supply for industrial withdrawal, and permafrost degradation. Here, we combined the use of ground penetrating...
A model of strength
Douglas H. Johnson, R.D. Cook
2013, Science (342) 192-193
In her AAAS News & Notes piece "Can the Southwest manage its thirst?" (26 July, p. 362), K. Wren quotes Ajay Kalra, who advocates a particular method for predicting Colorado River streamflow "because it eschews complex physical climate models for a statistical data-driven modeling approach." A preference for data-driven models...
Segmenting images automatically for granulometry and sedimentology: a martian case study
Suniti Karunatillake, Scott M. McLennan, Kenneth E. Herkenhoff, Jonathan M. Husch, Craig Hardgrove, J.R. Skok
2013, Icarus 408-417
In a companion work, we bridge the gap between mature segmentation software used in terrestrial sedimentology and emergent planetary segmentation with an original algorithm optimized to segment whole images from the Microscopic Imager (MI) of the Mars Exploration Rovers (MER). In this work, we compare its semi-automated outcome with manual photoanalyses using unconsolidated...
Phylogenetic conservatism in plant phenology
T. Jonathan Davies, Elizabeth M. Wolkovich, Nathan J. B. Kraft, Nicolas Salamin, Jenica M. Allen, Toby R. Ault, Julio L. Betancourt, Kjell Bolmgren, Elsa E. Cleland, Benjamin I. Cook, Theresa M. Crimmins, Susan J. Mazer, Gregory J. McCabe, Stephanie Pau, Jim Regetz, Mark D. Schwartz, Steven E. Travers
2013, Journal of Ecology (101) 1520-1530
Phenological events – defined points in the life cycle of a plant or animal – have been regarded as highly plastic traits, reflecting flexible responses to various environmental cues. The ability of a species to track, via shifts in phenological events, the abiotic environment through time might dictate its vulnerability to...
Network modularity reveals critical scales for connectivity in ecology and evolution
Robert J. Fletcher, Andre Revell, Brian E. Reichert, Wiley M. Kitchens, J. Dixon, James D. Austin
2013, Nature Communications (4) 1-7
For nearly a century, biologists have emphasized the profound importance of spatial scale for ecology, evolution and conservation. Nonetheless, objectively identifying critical scales has proven incredibly challenging. Here we extend new techniques from physics and social sciences that estimate modularity on networks to identify critical scales for movement and gene...
Estimated global nitrogen deposition using NO2 column density
Xuehe Lu, Hong Jiang, Xiuying Zhang, Jinxun Liu, Zhen Zhang, Jiaxin Jin, Ying Wang, Jianhui Xu, Miaomiao Cheng
2013, International Journal of Remote Sensing (34) 8893-8906
Global nitrogen deposition has increased over the past 100 years. Monitoring and simulation studies of nitrogen deposition have evaluated nitrogen deposition at both the global and regional scale. With the development of remote-sensing instruments, tropospheric NO2 column density retrieved from Global Ozone Monitoring Experiment (GOME) and Scanning Imaging Absorption...
Effects of dreissenids on monitoring and management of fisheries in western Lake Erie
Martin A. Stapanian, Patrick M. Kocovsky
2013, Book chapter, Quagga and zebra mussels: biology, impacts, and control
Water clarity increased in nearshore areas of western Lake Erie by the early-1990s mainly as a result of the filtering activities of dreissenid mussels (Dreissena spp.), which invaded in the mid-1980s. We hypothesized that increased water clarity would result in greater trawl avoidance and thus reduced ability to capture fish...
Variability and trends in irrigated and non-irrigated croplands in the central U.S
Jesslyn F. Brown, Md Shahriar Pervez
2013, Conference Paper, Information for sustainable agriculture, International Conference on Agro-Geoinformatics, 2nd, Fairfax, Va., 12–16 August 2013, Proceedings
Over 23 million hectares (233 thousand km2) of U.S. croplands are irrigated and there was an overall net expansion of 522 thousand hectares nationally from 2002 to 2007. Most of this expansion occurred across the High Plains Aquifer (HPA) in the central Great Plains. Until recently, there has been a...
Statistical mapping of zones of focused groundwater/surface-water exchange using fiber-optic distributed temperature sensing
Kisa Mwakanyamale, Frederick D. Day-Lewis, Lee D. Slater
2013, Water Resources Research (49) 6979-6984
Fiber-optic distributed temperature sensing (FO-DTS) increasingly is used to map zones of focused groundwater/surface-water exchange (GWSWE). Previous studies of GWSWE using FO-DTS involved identification of zones of focused GWSWE based on arbitrary cutoffs of FO-DTS time-series statistics (e.g., variance, cross-correlation between temperature and stage, or spectral power). New approaches are...
Seasonal circulation over the Catalan inner-shelf (northwest Mediterranean Sea)
Manel Grifoll, Alfredo L. Aretxabaleta, Josep L. Pelegri, Manuel Espino, John C. Warner, Agustin Sanchez-Arcilla
2013, Journal of Geophysical Research C: Oceans (118) 5844-5857
This study characterizes the seasonal cycle of the Catalan inner-shelf circulation using observations and complementary numerical results. The relation between seasonal circulation and forcing mechanisms is explored through the depth-averaged momentum balance, for the period between May 2010 and April 2011, when velocity observations were partially available. The monthly-mean along-shelf...
Alternative ways of using field-based estimates to calibrate ecosystem models and their implications for carbon cycle studies
Yujie He, Qianlai Zhuang, David McGuire, Yaling Liu, Min Chen
2013, Journal of Geophysical Research: Biogeosciences (118) 983-993
Model-data fusion is a process in which field observations are used to constrain model parameters. How observations are used to constrain parameters has a direct impact on the carbon cycle dynamics simulated by ecosystem models. In this study, we present an evaluation of several options for the use of observations...
Vs30 and spectral response from collocated shallow, active- and passive-source Vs data at 27 sites in Puerto Rico
Jack K. Odum, William J. Stephenson, Robert A. Williams, Christa von Hillebrandt-Andrade
2013, Bulletin of the Seismological Society of America (103) 2709-2728
Shear‐wave velocity (VS) and time‐averaged shear‐wave velocity to 30 m depth (VS30) are the key parameters used in seismic site response modeling and earthquake engineering design. Where VS data are limited, available data are often used to develop and refine map‐based proxy models of VS30 for predicting ground‐motion intensities. In...
Temporal, spatial, and body size effects on growth rates of loggerhead sea turtles (Caretta caretta) in the Northwest Atlantic
Karen A. Bjorndal, Barbara A. Schroeder, Allen M. Foley, Blair E. Witherington, Michael Bresette, David Clark, Richard M. Herren, Michael D. Arendt, Jeffrey R. Schmid, Anne B. Meylan, Peter A. Meylan, Jane A. Provancha, Kristen M. Hart, Margaret M. Lamont, Raymond R. Carthy, Alan B. Bolten
2013, Marine Biology (160) 2711-2721
In response to a call from the US National Research Council for research programs to combine their data to improve sea turtle population assessments, we analyzed somatic growth data for Northwest Atlantic (NWA) loggerhead sea turtles (Caretta caretta) from 10 research programs. We assessed growth dynamics over wide ranges of...
Links between climate change, water-table depth, and water chemistry in a mineralized mountain watershed
Andrew H. Manning, Philip L. Verplanck, Jonathan S. Caine, Andrew S. Todd
2013, Applied Geochemistry (37) 64-78
Recent studies suggest that climate change is causing rising solute concentrations in mountain lakes and streams. These changes may be more pronounced in mineralized watersheds due to the sensitivity of sulfide weathering to changes in subsurface oxygen transport. Specific causal mechanisms linking climate change and accelerated weathering rates have been...
Multivariate analysis of ATR-FTIR spectra for assessment of oil shale organic geochemical properties
Kathryn E. Washburn, Justin E. Birdwell
2013, Organic Geochemistry (63) 1-7
In this study, attenuated total reflectance (ATR) Fourier transform infrared spectroscopy (FTIR) was coupled with partial least squares regression (PLSR) analysis to relate spectral data to parameters from total organic carbon (TOC) analysis and programmed pyrolysis to assess the feasibility of developing predictive models to estimate important organic geochemical parameters....
Retrospective analysis of bottlenose dolphin foraging: a legacy of anthropogenic ecosystem disturbance
Sam Rossman, Nélio B. Barros, Peggy H. Ostrom, Craig A. Stricker, Aleta A. Hohn, Hasand Gandhi, Randall S. Wells
2013, Marine Mammal Science (29) 705-718
We used stable isotope analysis to investigate the foraging ecology of coastal bottlenose dolphins (Tursiops truncatus) in relation to a series of anthropogenic disturbances. We first demonstrated that stable isotopes are a faithful indicator of habitat use by comparing muscle isotope values to behavioral foraging data from the same individuals....
Social-ecological predictors of global invasions and extinctions
Aaron Lotz, Craig R. Allen
2013, Ecology and Society (18)
Most assessments of resilience have been focused on local conditions. Studies focused on the relationship between humanity and environmental degradation are rare, and are rarely comprehensive. We investigated multiple social-ecological factors for 100 countries around the globe in relation to the percentage of invasions and extinctions within each country. These...
A multilocus evaluation of ermine (Mustela erminea) across the Holarctic, testing hypotheses of Pleistocene diversification in response to climate change
Natalie G. Dawson, Andrew G. Hope, Sandra L. Talbot, Joseph A. Cook
2013, Journal of Biogeography (41) 464-475
Aim: We examined data for ermine (Mustela erminea) to test two sets of diversification hypotheses concerning the number and location of late Pleistocene refugia, the timing and mode of diversification, and the evolutionary influence of insularization. Location: Temperate and sub-Arctic Northern Hemisphere. Methods: We used up to two mitochondrial and four nuclear...
Evaluation of potential gas clogging associated with managed aquifer recharge from a spreading basin, southwestern Utah, U.S.A.
Victor M. Heilweil, Thomas Marston
2013, Book chapter, Clogging issues associated with managed aquifer recharge methods
Sand Hollow Reservoir in southwestern Utah, USA, is operated for both surface-water storage and managed aquifer recharge via infiltration from surface basin spreading to the underlying Navajo Sandstone. The total volume of estimated recharge from 2002 through 2011 was 131 Mm3., resulting in groundwater levels rising as much as 40...
An international network of magnetic observatories
Jeffrey J. Love, A. Chulliat
2013, Eos, Transactions, American Geophysical Union (94) 373-374
Since its formation in the late 1980s, the International Real-Time Magnetic Observatory Network (INTERMAGNET), a voluntary consortium of geophysical institutes from around the world, has promoted the operation of magnetic observatories according to modern standards [eg. Rasson, 2007]. INTERMAGNET institutes have cooperatively developed infrastructure for data exchange and management ads...
Spatial variability of "Did You Feel It?" intensity data: insights into sampling biases in historical earthquake intensity distributions
Susan E. Hough
2013, Bulletin of the Seismological Society of America (103) 2767-2781
Recent parallel development of improved quantitative methods to analyze intensity distributions for historical earthquakes and of web‐based systems for collecting intensity data for modern earthquakes provides an opportunity to reconsider not only important individual historical earthquakes but also the overall characterization of intensity distributions for historical events. The focus of...
Monitoring of livestock grazing effects on Bureau of Land Management land
Kari E. Veblen, David A. Pyke, Cameron L. Aldridge, Michael L. Casazza, Timothy J. Assal, Melissa A. Farinha
2013, Society for Range Management (67) 68-77
Public land management agencies, such as the Bureau of Land Management (BLM), are charged with managing rangelands throughout the western United States for multiple uses, such as livestock grazing and conservation of sensitive species and their habitats. Monitoring of condition and trends of these rangelands, particularly with respect to effects...
