Probing the deep critical zone beneath the Luquillo Experimental Forest, Puerto Rico
Heather L. Buss, Susan L. Brantley, Fred Scatena, Katya Bazilevskaya, Alex E. Blum, Marjorie S. Schulz, Rafael Jimenez, Arthur F. White, G. Rother, D. Cole
2013, Earth Surface Processes and Landforms (38) 1170-1186
Recent work has suggested that weathering processes occurring in the subsurface produce the majority of silicate weathering products discharged to the world's oceans, thereby exerting a primary control on global temperature via the well-known positive feedback between silicate weathering and CO2. In addition, chemical and physical weathering processes deep within...
Projected future changes in vegetation in western North America in the 21st century
Jiang Xiaoyan, Sara A. Rauscher, Todd D. Ringler, David M. Lawrence, A. Park Williams, Craig D. Allen, Allison L. Steiner, D. Michael Cai, Nate G. McDowell
2013, Journal of Climate (26) 3671-3687
Rapid and broad-scale forest mortality associated with recent droughts, rising temperature, and insect outbreaks has been observed over western North America (NA). Climate models project additional future warming and increasing drought and water stress for this region. To assess future potential changes in vegetation distributions in western NA, the Community...
Projections and downscaling of 21st century temperatures, precipitation, radiative fluxes and winds for the southwestern US, with focus on the Lake Tahoe basin
Michael D. Dettinger
2013, Climatic Change (116) 17-33
Recent projections of global climate changes in response to increasing greenhouse-gas concentrations in the atmosphere include warming in the Southwestern US and, especially, in the vicinity of Lake Tahoe of from about +3°C to +6°C by end of century and changes in precipitation on the order of 5-10 % increases...
Regional demographic trends from long-term studies of saguaro (Carnegiea gigantea) across the northern Sonoran Desert
Elizabeth A. Pierson, Julio L. Betancourt, Raymond M. Turner
2013, Journal of Arid Environments (88) 57-69
Ten saguaro (Carnegiea gigantea) populations in the northern Sonoran Desert were monitored from 1959 to 2005 to discriminate how climate influences plant growth, abundance, reproductive potential, survivorship, age structure and regeneration trends. Thousands of saguaros were measured to determine site-specific growth rates and survivorship through time. Observed growth rates were...
Relaxing the closure assumption in single-season occupancy models: staggered arrival and departure times
William L. Kendall, James E. Hines, James D. Nichols, Evan H. Campbell Grant
2013, Ecology (94) 610-617
Occupancy statistical models that account for imperfect detection have proved very useful in several areas of ecology, including species distribution and spatial dynamics, disease ecology, and ecological responses to climate change. These models are based on the collection of multiple samples at each of a number of sites within a...
Instrumental neutron activation analysis data for cloud-water particulate samples, Mount Bamboo, Taiwan
Neng-Huei Lin, Guey-Rong Sheu, Gregory A. Wetherbee, Timothy M. Debey
2013, Open-File Report 2013-1147
Cloud water was sampled on Mount Bamboo in northern Taiwan during March 22-24, 2002. Cloud-water samples were filtered using 0.45-micron filters to remove particulate material from the water samples. Filtered particulates were analyzed by instrumental neutron activation analysis (INAA) at the U.S. Geological Survey National Reactor Facility in Denver, Colorado,...
Relative influence of human harvest, carnivores, and weather on adult female elk survival across western North America
Jedediah Brodie, Heather E. Johnson, Michael Mitchell, Peter Zager, Kelly Proffitt, Mark Hebblewhite, Matthew Kauffman, Bruce Johnson, John Bissonette, Chad Bishop, Justin Gude, Jeff Herbert, Kent Hersey, Mark Hurley, Paul M. Lukacs, Scott McCorquodale, Eliot McIntire, Josh Nowak, Hall Sawyer, Douglas Smith, P.J. White
2013, Journal of Applied Ecology (50) 295-305
Well-informed management of harvested species requires understanding how changing ecological conditions affect demography and population dynamics, information that is lacking for many species. We have limited understanding of the relative influence of carnivores, harvest, weather and forage availability on elk Cervus elaphus demography, despite the ecological and economic importance of...
An interactive web application for visualizing climate data
J. Alder, S. Hostetler, D. Williams
2013, Eos, Transactions, American Geophysical Union (94) 197-198
Massive volumes of data are being created as modeling centers from around the world finalize their submission of climate simulations for the Coupled Model Intercomparison Project, phase 5 (CMIP5), in preparation for the forthcoming Intergovernmental Panel on Climate Change (IPCC) Fifth Assessment Report (AR5). Scientists, resource managers, and other potential...
Review of the negative influences of non-native salmonids on native fish species
Kelly C. Turek, Mark A. Pegg, Kevin L. Pope
2013, Great Plains Research (23) 39-49
Non-native salmonids are often introduced into areas containing species of concern, yet a comprehensive overview of the short- and long-term consequences of these introductions is lacking in the Great Plains. Several authors have suggested that non-native salmonids negatively inflfluence species of concern. The objective of this paper is to review...
The quality of our Nation's waters: factors affecting public-supply-well vulnerability to contamination: understanding observed water quality and anticipating future water quality
Sandra M. Eberts, Mary Ann Thomas, Martha L. Jagucki
2013, Circular 1385
As part of the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program, a study was conducted from 2001 to 2011 to shed light on factors that affect the vulnerability of water from public-supply wells to contamination (referred to hereafter as “public-supply-well vulnerability”). The study was designed as a follow-up to...
Continuous resistivity profiling data from Great South Bay, Long Island, New York
V.A. Cross, J.F. Bratton, K.D. Kroeger, John Crusius, C.R. Worley
2013, Open-File Report 2011-1040
An investigation of submarine aquifers adjacent to the Fire Island National Seashore and Long Island, New York was conducted to assess the importance of submarine groundwater discharge as a potential nonpoint source of nitrogen delivery to Great South Bay. Over 200 kilometers of continuous resistivity profiling data were collected to...
Nitrous oxide emissions from cropland: a procedure for calibrating the DayCent biogeochemical model using inverse modelling
Rashad Rafique, Michael N. Fienen, Timothy B. Parkin, Robert P. Anex
2013, Water, Air, & Soil Pollution (224) 1-15
DayCent is a biogeochemical model of intermediate complexity widely used to simulate greenhouse gases (GHG), soil organic carbon and nutrients in crop, grassland, forest and savannah ecosystems. Although this model has been applied to a wide range of ecosystems, it is still typically parameterized through a traditional “trial and error”...
Bridging groundwater models and decision support with a Bayesian network
Michael N. Fienen, John P. Masterson, Nathaniel G. Plant, Benjamin T. Gutierrez, E. Robert Thieler
2013, Water Resources Research (49) 6459-6473
Resource managers need to make decisions to plan for future environmental conditions, particularly sea level rise, in the face of substantial uncertainty. Many interacting processes factor in to the decisions they face. Advances in process models and the quantification of uncertainty have made models a valuable tool for this purpose....
Correction to “Estimating the timing and location of shallow rainfall-induced landslides using a model for transient, unsaturated infiltration”
Rex L. Baum, Jonathan W. Godt
2013, Journal of Geophysical Research F: Earth Surface (118) 1999-1999
No abstract is available for this article....
An expanded map of vegetation communities at Big Muddy National Fish and Wildlife Refuge
Matthew A. Struckhoff
2013, Data Series 785
In 2012, a map of vegetation communities on Big Muddy National Fish and Wildlife Refuge was expanded based on interpretation of aerial photographs and field data. National Agricultural Imagery Program aerial photographs were used to identify distinct communities on previously unmapped refuge units and newly acquired parcels. Newly mapped polygons...
Sediment geochemistry of Corte Madera Marsh, San Francisco Bay, California: have local inputs changed, 1830-2010?
Renee K. Takesue, Bruce E. Jaffe
2013, Open-File Report 2013-1042
Large perturbations since the mid-1800s to the supply and source of sediment entering San Francisco Bay have disturbed natural processes for more than 150 years. Only recently have sediment inputs through the Sacramento-San Joaquin Delta (the Delta) decreased to what might be considered pre-disturbance levels. Declining sediment inputs to San...
Late Quaternary stream piracy and strath terrace formation along the Belle Fourche and lower Cheyenne Rivers, South Dakota and Wyoming
John F. Stamm, Robert R. Hendricks, J. Foster Sawyer, Shannon Mahan, Brent J. Zaprowski, Nicholas M. Geibel, David C. Azzolini
2013, Geomorphology (197) 10-20
Stream piracy substantially affected the geomorphic evolution of the Missouri River watershed and drainages within, including the Little Missouri, Cheyenne, Belle Fourche, Bad, and White Rivers. The ancestral Cheyenne River eroded headward in an annular pattern around the eastern and southern Black Hills and pirated the headwaters of the ancestral...
A conceptual framework for Lake Michigan coastal/nearshore ecosystems, with application to Lake Michigan Lakewide Management Plan (LaMP) objectives
Paul W. Seelbach, Lisa R. Fogarty, David Bo Bunnell, Sheridan K. Haack, Mark W. Rogers
2013, Open-File Report 2013-1138
The Lakewide Management Plans (LaMPs) within the Great Lakes region are examples of broad-scale, collaborative resource-management efforts that require a sound ecosystems approach. Yet, the LaMP process is lacking a holistic framework that allows these individual actions to be planned and understood within the broader context of the Great Lakes...
Springs, streams, and gas vent on and near Mount Adams volcano, Washington
Manuel Nathenson, Robert H. Mariner
2013, Scientific Investigations Report 2013-5097
Springs and some streams on Mount Adams volcano have been sampled for chemistry and light stable isotopes of water. Spring temperatures are generally cooler than air temperatures from weather stations at the same elevation. Spring chemistry generally reflects weathering of volcanic rock from dissolved carbon dioxide. Water in some springs...
Potential effects of deepening the St. Johns River navigation channel on saltwater intrusion in the surficial aquifer system, Jacksonville, Florida
Jason C. Bellino, Rick M. Spechler
2013, Scientific Investigations Report 2013-5146
The U.S. Army Corps of Engineers (USACE) has proposed dredging a 13-mile reach of the St. Johns River navigation channel in Jacksonville, Florida, deepening it to depths between 50 and 54 feet below North American Vertical Datum of 1988. The dredging operation will remove about 10 feet of sediments from...
Fatty acid composition at the base of aquatic food webs is influenced by habitat type and watershed land use
James H. Larson, William B. Richardson, Brent C. Knights, Lynn Bartsch, Michelle Bartsch, J. C. Nelson, Jason A. Veldboom, Jonathan M. Vallazza
2013, PLoS ONE (8)
Spatial variation in food resources strongly influences many aspects of aquatic consumer ecology. Although large-scale controls over spatial variation in many aspects of food resources are well known, others have received little study. Here we investigated variation in the fatty acid (FA) composition of seston and primary consumers within (i.e.,...
Post-earthquake building safety inspection: Lessons from the Canterbury, New Zealand, earthquakes
J. Marshall, Kishor S. Jaiswal, N. Gould, F. Turner, B. Lizundia, J. Barnes
2013, Earthquake Spectra (29) 1091-1107
The authors discuss some of the unique aspects and lessons of the New Zealand post-earthquake building safety inspection program that was implemented following the Canterbury earthquake sequence of 2010–2011. The post-event safety assessment program was one of the largest and longest programs undertaken in recent times anywhere in the world....
Frictional-faulting model for harmonic tremor before Redoubt Volcano eruptions
Ksenia Dmitrieva, Alicia J. Hotovec-Ellis, Stephanie G. Prejean, Eric M. Dunham
2013, Nature Geoscience (6) 652-656
Seismic unrest, indicative of subsurface magma transport and pressure changes within fluid-filled cracks and conduits, often precedes volcanic eruptions. An intriguing form of volcano seismicity is harmonic tremor, that is, sustained vibrations in the range of 0.5–5 Hz. Many source processes can generate harmonic tremor. Harmonic tremor in the 2009 eruption...
Refinement of late-Early and Middle Miocene diatom biostratigraphy for the east coast of the United States
John A. Barron, James Browning, Peter Sugarman, Kenneth G. Miller
2013, Geosphere (9) 1286-1302
Integrated Ocean Drilling Program (IODP) Expedition 313 continuously cored Lower to Middle Miocene sequences at three continental shelf sites off New Jersey, USA. The most seaward of these, Site M29, contains a well-preserved Early and Middle Miocene succession of planktonic diatoms that have been independently correlated with the geomagnetic polarity...
Eastern musk turtle (Sternotherus odoratus)
Brad M. Glorioso
2013, Book chapter, The Reptiles of Tennessee
No abstract available....
