Drought effect on selection of conservation reserve program grasslands by white-tailed deer on the Northern Great Plains
T.W. Grovenburg, C.N. Jacques, R. W. Klaver, J.A. Jenks
2011, American Midland Naturalist (166) 147-162
Limited information exists regarding summer resource selection of white-tailed deer (Odocoileus virginianus) in grassland regions of the Northern Great Plains. During summers 2005-2006, we analyzed habitat selection of adult female white-tailed deer in north-central South Dakota. We collected 1905 summer locations and used 21 and 30 home ranges during 2005...
Shallow conduit system at Kilauea Volcano, Hawaii, revealed by seismic signals associated with degassing bursts
Bernard Chouet, Phillip Dawson
2011, Journal of Geophysical Research B: Solid Earth (116) B12317
Eruptive activity at the summit of Kilauea Volcano, Hawaii, beginning in March, 2008 and continuing to the present time is characterized by episodic explosive bursts of gas and ash from a vent within Halemaumau Pit Crater. These bursts are accompanied by seismic signals that are well recorded by a broadband...
Potential increase in floods in California's Sierra Nevada under future climate projections
T. Das, M. D. Dettinger, D.R. Cayan, H.G. Hidalgo
2011, Climatic Change (109) 71-94
California’s mountainous topography, exposure to occasional heavily moisture-laden storm systems, and varied communities and infrastructures in low lying areas make it highly vulnerable to floods. An important question facing the state—in terms of protecting the public and formulating water management responses to climate change—is “how might future climate changes affect...
Evaluation of the Global Multi-Resolution Terrain Elevation Data 2010 (GMTED2010) using ICESat geodetic control
C.C. Carabajal, D.J. Harding, J.-P. Boy, Jeffrey J. Danielson, D.B. Gesch, V.P. Suchdeo
2011, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
Supported by NASA's Earth Surface and Interior (ESI) Program, we are producing a global set of Ground Control Points (GCPs) derived from the Ice, Cloud and land Elevation Satellite (ICESat) altimetry data. From February of 2003, to October of 2009, ICESat obtained nearly global measurements of land topography (+/- 86deg...
Tourmaline as a recorder of ore-forming processes
John F. Slack, Robert B. Trumbull
2011, Elements (7) 321-326
Tourmaline occurs in diverse types of hydrothermal mineral deposits and can be used to constrain the nature and evolution of ore-forming fl uids. Because of its broad range in composition and retention of chemical and isotopic signatures, tourmaline may be the only robust recorder of original mineralizing processes in some...
Informal and formal trail monitoring protocols and baseline conditions: Acadia National Park
Jeffrey L. Marion, Jeremy F. Wimpey, L. Park
2011, Report
At Acadia National Park, changing visitor use levels and patterns have contributed to an increasing degree of visitor use impacts to natural and cultural resources. To better understand the extent and severity of these resource impacts and identify effective management techniques, the park sponsored this research to develop monitoring protocols,...
The effect of structural complexity, prey density, and "predator-free space" on prey survivorship at created oyster reef mesocosms
Austin T. Humphries, Megan La Peyre, Gary A. Decossas
2011, PLoS ONE (6)
Interactions between predators and their prey are influenced by the habitat they occupy. Using created oyster (Crassostrea virginica) reef mesocosms, we conducted a series of laboratory experiments that created structure and manipulated complexity as well as prey density and “predator-free space” to examine the relationship between structural complexity and prey...
Pseudospectral modeling and dispersion analysis of Rayleigh waves in viscoelastic media
K. Zhang, Y. Luo, J. Xia, C. Chen
2011, Soil Dynamics and Earthquake Engineering (31) 1332-1337
Multichannel Analysis of Surface Waves (MASW) is one of the most widely used techniques in environmental and engineering geophysics to determine shear-wave velocities and dynamic properties, which is based on the elastic layered system theory. Wave propagation in the Earth, however, has been recognized as viscoelastic and the propagation of...
A heuristic simulation model of Lake Ontario circulation and mass balance transport
J.E. McKenna Jr., M.A. Chalupnicki
2011, Journal of Freshwater Ecology (26) 123-132
The redistribution of suspended organisms and materials by large-scale currents is part of natural ecological processes in large aquatic systems but can contribute to ecosystem disruption when exotic elements are introduced into the system. Toxic compounds and planktonic organisms spend various lengths of time in suspension before settling to the...
Survey of stranded gas and delivered costs to Europe of selected gas resources
Emil D. Attanasi, Philip A. Freeman
2011, Conference Paper
Two important trends affecting the expected growth of global gas markets are (1) the shift by many industrialized countries from coal-fired electricity generation to the use of natural gas to generate electricity and (2) the industrialization of the heavily populated Asian countries of India and China. This paper surveys discovered...
Seasonal timing of first rain storms affects rare plant population dynamics
J.M. Levine, A. K. McEachern, C. Cowan
2011, Ecology (92) 2236-2247
A major challenge in forecasting the ecological consequences of climate change is understanding the relative importance of changes to mean conditions vs. changes to discrete climatic events, such as storms, frosts, or droughts. Here we show that the first major storm of the growing season strongly influences the population dynamics...
Ecological strategies in california chaparral: Interacting effects of soils, climate, and fire on specific leaf area
Brian Anacker, Nishanta Rajakaruna, David Ackerly, Susan Harrison, Jon E. Keeley, Michael Vasey
2011, Plant Ecology and Diversity (4) 179-188
Background: High values of specific leaf area (SLA) are generally associated with high maximal growth rates in resource-rich conditions, such as mesic climates and fertile soils. However, fire may complicate this relationship since its frequency varies with both climate and soil fertility, and fire frequency selects for regeneration strategies (resprouting...
Methodology to assess water presence on speleothems during periods of low precipitation, with implications for recharge sources - Kartchner Caverns, Arizona
Kyle W. Blasch
2011, Journal of Cave and Karst Studies (73) 63-74
Beginning in January 2005, recharge processes and the presence of water on speleothems were monitored in Kartchner Caverns during a 44-month period when annual rainfall rates were 6 to 18 percent below the long-term mean. Electrical-resistance sensors designed to detect the presence of water were used to identify ephemeral streamflow...
Evaluation of Nobuto filter paper strips for the detection of avian influenza virus antibody in waterfowl
Robert J. Dusek, Jeffrey S. Hall, Sean W. Nashold, Joshua L. Teslaa, Hon S. Ip
2011, Avian Diseases (55) 674-676
The utility of using Nobuto paper strips for the detection of avian influenza antibodies was examined in mallards (Anas platyrhynchos) experimentally infected with low pathogenic avian influenza viruses. Blood was collected 2 wk after infection and was preserved either as serum or whole blood absorbed onto Nobuto strips. Analysis of...
Evidence for low-grade metamorphism, hydrothermal alteration, and diagenesis on Mars from phyllosilicate mineral assemblages
Bethany L. Ehlmann, John F Mustard, Roger N. Clark, Gregg A. Swayze, Scott L. Murchie
2011, Clays and Clay Minerals (59) 359-377
The enhanced spatial and spectral resolution provided by the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) on the Mars Reconnaissance Orbiter (MRO) has led to the discovery of numerous hydrated silicate minerals on Mars, particularly in the ancient, cratered crust comprising the southern highlands. Phases recently identified using visible/near-infrared spectra...
New insights from well responses to fluctuations in barometric pressure
J.J. Butler, W. Jin, G.A. Mohammed, E.C. Reboulet
2011, Ground Water (49) 525-533
Hydrologists have long recognized that changes in barometric pressure can produce changes in water levels in wells. The barometric response function (BRF) has proven to be an effective means to characterize this relationship; we show here how it can also be utilized to glean valuable insights into semi-confined aquifer systems....
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...
Ontogenetic and diel variation in stream habitat use by brook trout (Salvelinus fontinalis) in a headwater stream
J. H. Johnson, R. M. Ross, D. S. Dropkin, Lori A. Redell
2011, Journal of Freshwater Ecology (26) 143-152
Although considerable information exists on habitat use by stream salmonids, only a small portion has quantitatively examined diurnal and nocturnal habitat variation. We examined diel variation in habitat use by age-0 and age-1+ brook trout (Salvelinus fontinalis) during summer and autumn in a headwater stream in northern Pennsylvania. Habitat variables...
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...
Modeling hydrologic and geomorphic hazards across post-fire landscapes using a self-organizing map approach
Michael J. Friedel
2011, Environmental Modelling and Software (26) 1660-1674
Few studies attempt to model the range of possible post-fire hydrologic and geomorphic hazards because of the sparseness of data and the coupled, nonlinear, spatial, and temporal relationships among landscape variables. In this study, a type of unsupervised artificial neural network, called a self-organized map (SOM), is trained using data...
A predator-prey model with a holling type I functional response including a predator mutual interference
G. Seo, D.L. DeAngelis
2011, Journal of Nonlinear Science (21) 811-833
The most widely used functional response in describing predator-prey relationships is the Holling type II functional response, where per capita predation is a smooth, increasing, and saturating function of prey density. Beddington and DeAngelis modified the Holling type II response to include interference of predators that increases with predator density....
Water and heat transport in boreal soils: Implications for soil response to climate change
Z. Fan, J. C. Neff, J.W. Harden, T. Zhang, H. Veldhuis, C.I. Czimczik, G.C. Winston, J. A. O'Donnell
2011, Science of the Total Environment (409) 1836-1842
Soil water content strongly affects permafrost dynamics by changing the soil thermal properties. However, the movement of liquid water, which plays an important role in the heat transport of temperate soils, has been under-represented in boreal studies. Two different heat transport models with and without convective heat transport were compared...
Field survey of the March 28, 2005 Nias-Simeulue earthquake and Tsunami
J.C. Borrero, B. McAdoo, B. Jaffe, L. Dengler, G. Gelfenbaum, B. Higman, R. Hidayat, A. Moore, W. Kongko, Lukijanto, R. Peters, G. Prasetya, V. Titov, E. Yulianto
2011, Pure and Applied Geophysics (168) 1075-1088
On the evening of March 28, 2005 at 11:09 p.m. local time (16:09 UTC), a large earthquake occurred offshore of West Sumatra, Indonesia. With a moment magnitude (Mw) of 8.6, the event caused substantial shaking damage and land level changes between Simeulue Island in the north and the Batu Islands...
Mercury capture by selected Bulgarian fly ashes: Influence of coal rank and fly ash carbon pore structure on capture efficiency
I.J. Kostova, J.C. Hower, Maria Mastalerz, S.V. Vassilev
2011, Applied Geochemistry (26) 18-27
Mercury capture by fly ash C was investigated at five lignite- and subbituminous-coal-burning Bulgarian power plants (Republika, Bobov Dol, Maritza East 2, Maritza East 3, and Sliven). Although the C content of the ashes is low, never exceeding 1.6%, the Hg capture on a unit C basis demonstrates that the...
Impacts of agricultural land use on biological integrity: A causal analysis
C.M. Riseng, M.J. Wiley, Robert W. Black, M.D. Munn
2011, Ecological Applications (21) 3128-3146
Agricultural land use has often been linked to nutrient enrichment, habitat degradation, hydrologic alteration, and loss of biotic integrity in streams. The U.S. Geological Survey's National Water Quality Assessment Program sampled 226 stream sites located in eight agriculture‐dominated study units across the United States to investigate the geographic variability and...
