Augusta Warden
Science and Products
Stable Isotope Natural Gas Reference Materials
Scientists, resource managers, and industry have new natural gas standards available, courtesy of the U.S. Geological Survey. These reference gases are the replacement for the prior standards maintained by the U.S. National Institute of Standards and Technology.
The natural gas standards are intended to serve as the primary carbon and hydrogen stable isotope reference materials for...
Post-fire temporal trends in soil-physical and -hydraulic properties and simulated runoff generation: Insights from different burn severities in the 2013 Black Forest Fire, CO, USA
Burn severity influences on post-fire recovery of soil-hydraulic properties controlling runoff generation are poorly understood despite the importance for parameterizing infiltration models. We measured soil-hydraulic properties of field-saturated hydraulic conductivity (Kfs), sorptivity (S), and wetting front potential (ψf) for four years after...
Ebel, Brian A.; Moody, John A.; Martin, Deborah A. Evaluation of ELISA for the analysis of imidacloprid in biological matrices: Cross-reactivities, matrix interferences, and comparison to LC-MS/MS
Imidacloprid is among the most used pesticides worldwide and there are toxicity concerns for nontarget organisms. Accurate and sensitive methods are necessary to quantitate imidacloprid concentrations in biological matrices to better understand their fate and effects. Here we evaluated an enzyme-linked immunosorbent assay (ELISA) kit for...
Gross, Michael S.; Woodward, Emily; Hladik, Michelle
Forecasting drought probabilities for streams in the northeastern United States
Maximum likelihood logistic regression (MLLR) models for the northeastern United States forecast drought probability estimates for water flowing in rivers and streams using methods previously identified and developed. Streamflow data from winter months are used to estimate chances of hydrological drought during summer months. Daily streamflow data...
Austin, Samuel H. Global drivers of avian haemosporidian infections vary across zoogeographical regions
Aim: Macroecological analyses provide valuable insights into factors that influence how parasites are distributed across space and among hosts. Amid large uncertainties that arise when generalizing from local and regional findings, hierarchical approaches applied to global datasets are required to determine whether drivers of parasite infection...
Kamath, Pauline; Fecchio, Alan; Clark, Nicholas J.; Bell, Jeffrey A; Skeen, Heather; Lutz, Holly L; De La Torre, Gabriel M; Vaughan, Jefferson A; Tkach, Vasyl V.; Schunck, Fabio; Ferreira, Francisco C; Braga, Érika M; Lugarini, Camile; Wamiti, Wanyoike; Dispoto, Janice H; Galen, Spencer C; Kirchgatter, Karin; Sagario, M. Cecilia; Cueto, Victor R; González-Acuña, Daniel; Inumaru, Mizue; Sato, Yukita; Schumm, Yvonne R.; Quillfeldt, Petra; Pellegrino, Irene; Dharmarajan, Guha; Gupta, Pooja; Robin, V. V.; Ciloglu, Arif; Yildirim, Alparslan; Huang, Xi; Chapa-Vargas, Leonardo; Álvarez-Mendizábal, Paulina; Santiago-Alarcon, Diego; Drovetski, Serguei Vyacheslavovich; Hellgren, Olof; Voelker, Gary; Ricklefs, Robert E; Hackett, Shannon; Collins, Michael D; Weckstein, Jason D; Wells, Konstans Thermal stability of an adaptable, invasive ectotherm: Argentine giant tegus in the Greater Everglades ecosystem, USA
Invasive species globally threaten biodiversity and economies, but the ecophysiological mechanisms underlying their success are often understudied. For those alien species that also exhibit high phenotypic plasticity, such as habitat generalists, adaptations in response to environmental pressures can take place relatively quickly. The Argentine...
Currylow, Andrea Faye; Michelle Collier; Emma B. Hanslowe; Bryan G. Falk; Cade, Brian S.; Sarah E. Moy; Alejandro Grajal-Puche; Frank N. Ridgley; Reed, Robert; Yackel Adams, Amy A. Advancing cave detection using terrain analysis and thermal imagery
Since the initial experiments nearly 50 years ago, techniques for detecting caves using airborne and spacecraft acquired thermal imagery have improved markedly. These advances are largely due to a combination of higher instrument sensitivity, modern computing systems, and processor-intensive analytical techniques. Through applying these...
Wynne, J. Judson; Jenness, Jeff; Sonderegger, Derek; Titus, Timothy N.; Jhabvala, Murzy D.; Cabrol, Nathalie A. Digital elevation models: Terminology and definitions
Digital elevation models (DEMs) provide fundamental depictions of the three-dimensional shape of the Earth’s surface and are useful to a wide range of disciplines. Ideally, DEMs record the interface between the atmosphere and the lithosphere using a discrete two-dimensional grid, with complexities introduced by the intervening hydrosphere,...
Guth, Peter L.; Van Niekerk, Adriaan; Grohmann, Carlos H.; Muller, Jan-Peter; Hawker, Laurence; Florinsky, Igor V.; Gesch, Dean B.; Reuter, Hannes I.; Herrera-Cruz, Virginia; Riazanoff, Serge; López-Vázquez, Carlos; Carabajal, Claudia C.; Albinet, Clément; Strobl, Peter The application of metacommunity theory to the management of riverine ecosystems
River managers strive to use the best available science to sustain biodiversity and ecosystem function. To achieve this goal requires consideration of processes at different scales. Metacommunity theory describes how multiple species from different communities potentially interact with local-scale environmental drivers to influence population...
Patrick, Christopher J.; Anderson, Kurt E.; Brown, Brown L.; Hawkins, Charles P.; Metcalfe, Anya; Saffarinia, Parsa; Siqueira, Tadeu; Swan, Christopher M.; Tonkin, Jonathan D.; Yuan, Lester L.
Streamflow—Water year 2020
The maps and graphs in this summary describe national streamflow conditions for water year 2020 (October 1, 2019, to September 30, 2020) in the context of streamflow ranks relative to the 91-year period of water years 1930–2020. Annual runoff in the Nation’s rivers and streams during water year 2020 (11.10 inches) was higher than the long-term (...
Jian, Xiaodong; Wolock, David M.; Lins, Harry F.; Henderson, Ronald J.; Brady, Steven J.
A machine learning approach to modeling streamflow with sparse data in ungaged watersheds on the Wyoming Range, Wyoming, 2012–17
Scant availability of streamflow data can impede the utility of streamflow as a variable in ecological models of aquatic and terrestrial species, especially when studying small streams in watersheds that lack streamgages. Streamflow data at fine resolution and broad extent were needed by collaborators for ecological research on small streams in...
McShane, Ryan R.; Eddy-Miller, Cheryl A.
Rigorously valuing the coastal hazard risks reduction provided by potential coral reef restoration in Florida and Puerto Rico
The restoration of coastal habitats, particularly coral reefs, can reduce risks by decreasing the exposure of coastal communities to flooding hazards. In the United States, the protective services provided by coral reefs were recently assessed in social and economic terms, with the annual protection provided by U.S. coral reefs off the coasts of...
Storlazzi, Curt D.; Reguero, Borja G.; Cumming, Kristen A.; Cole, Aaron D.; Shope, James B.; Gaido L., Camila; Viehman, T. Shay; Nickel, Barry A.; Beck, Michael W.
Rigorously valuing the impact of projected coral reef degradation on coastal hazard risk in Florida
The degradation of coastal habitats, particularly coral reefs, raises risks by increasing the exposure of coastal communities to flooding hazards. In the United States, the physical protective services provided by coral reefs were recently assessed, in social and economic terms, with the annual protection provided by U.S. coral reefs off the coast...
Storlazzi, Curt D.; Reguero, Borja G.; Yates, Kimberly K.; Cumming, Kristen A.; Cole, Aaron D.; Shope, James B.; Gaido L., Camila; Zawada, David G.; Arsenault, Stephanie R.; Fehr, Zachery W.; Nickel, Barry A.; Beck, Michael W.