Spatial and temporal patterns in streamflow, water chemistry, and aquatic macroinvertebrates of selected streams in Fairfax County, Virginia, 2007–18
Aaron J. Porter, James S. Webber, Jonathan W. Witt, John D. Jastram
2020, Scientific Investigations Report 2020-5061
Urbanization substantially alters the landscape in ways that can impact stream hydrology, water chemistry, and the health of aquatic communities. Stormwater best management practices (BMPs) are the primary tools used to mitigate the effects of urban stressors such as increased runoff, decreased baseflow, and increased nutrient and sediment transport. To...
Effects of snake fungal disease on short‐term survival, behavior, and movement in free‐ranging snakes
Jennifer M. McKenzie, Steven J. Price, Grant M. Connette, Simon J Bonner, Jeffrey M. Lorch
2020, Ecological Applications (31)
Pathogenic fungi are increasingly associated with epidemics in wildlife populations. Snake fungal disease (SFD, also referred to as Ophidiomycosis) is an emerging threat to snakes, taxa that are elusive and difficult to sample. Thus, assessments of the effects of SFD on populations have rarely occurred. We used a field technique...
Focused fluid flow and methane venting along the Queen Charlotte fault, offshore Alaska (USA) and British Columbia (Canada)
Nancy G. Prouty, Daniel S. Brothers, Jared W. Kluesner, J. Vaughn Barrie, Brian D. Andrews, Rachel Lauer, Gary Greene, James E. Conrad, Thomas Lorenson, Michael D. Law, Diana Sahy, Kim Conway, Mary McGann, Peter Dartnell
2020, Geosphere (16) 1336-1357
Fluid seepage along obliquely deforming plate boundaries can be an important indicator of crustal permeability and influence on fault-zone mechanics and hydrocarbon migration. The ~850-km-long Queen Charlotte fault (QCF) is the dominant structure along the right-lateral transform boundary that separates the Pacific and North American tectonic plates offshore southeastern Alaska...
Regional regression equations for estimation of four hydraulic properties of streams at approximate bankfull conditions for different ecoregions in Texas
William H. Asquith, John D. Gordon, David S. Wallace
2020, Scientific Investigations Report 2020-5086
The U.S. Geological Survey, in cooperation with the U.S. Army Corps of Engineers, assessed statistical relations between hydraulic properties of streams at approximate bankfull conditions for different ecological regions (ecoregions) in Texas. Data from more than 103,000 records of measured discharge and ancillary hydraulic properties were assembled from summaries of...
Carbon dioxide and methane flux in a dynamic Arctic tundra landscape: Decadal‐scale impacts of ice wedge degradation and stabilization
Kimberly P. Wickland, M.Torre Jorgenson, Joshua C. Koch, Mikhail Z. Kanevskiy, Robert G. Striegl
2020, Geophysical Research Letters (47)
Ice wedge degradation is a widespread occurrence across the circumpolar Arctic causing extreme spatial heterogeneity in water distribution, vegetation, and energy balance across landscapes. These heterogeneities influence carbon dioxide (CO2) and methane (CH4) fluxes, yet there is little understanding of how they effect change in landscape‐level carbon (C) gas flux...
Development of a submerged aquatic vegetation growth model in the Coupled Ocean–Atmosphere–Wave–Sediment Transport (COAWST v3.4) model
Tarandeep S. Kalra, Neil K. Ganju, Jeremy M. Testa
2020, Geoscientific Model Development (13) 5211-5228
The coupled biophysical interactions between submerged aquatic vegetation (SAV), hydrodynamics (currents and waves), sediment dynamics, and nutrient cycling have long been of interest in estuarine environments. Recent observational studies have addressed feedbacks between SAV meadows and their role in modifying current velocity, sedimentation, and nutrient cycling. To represent these dynamic...
High-frequency data reveal deicing salts drive elevated specific conductance and chloride along with pervasive and frequent exceedances of the U.S. Environmental Protection Agency aquatic life criteria for chloride in urban streams
Joel Moore, Rosemary M. Fanelli, Andrew J. Sekellick
2020, Environmental Science and Technology (54) 778-789
Increasing specific conductance (SC) and chloride concentrations [Cl] negatively affect many stream ecosystems. We characterized spatial variability in SC, [Cl], and exceedances of Environmental Protection Agency [Cl] criteria using nearly 30 million high-frequency observations (2–15 min intervals) for SC and modeled...
Wildfire and landscape change
Paul M. Santi, Francis K. Rengers
2020, Book chapter, Reference module in earth systems and environmental sciences
Wildfire is a worldwide phenomenon that is expected to increase in extent and severity in the future, due to fuel accumulations, shifting land management practices, and climate change. It immediately affects the landscape by removing vegetation, depositing ash, influencing water-repellent soil formation, and physically weathering boulders and bedrock. These changes...
Ratios of methylmercury to total mercury in predator and primary consumer insects from Adirondack streams in New York State
Karen Riva-Murray
2020, Summary Report 20-32
Mercury (Hg) is a global pollutant that affects aquatic biota in otherwise pristine settings such as the Adirondack region of New York State. Bioaccumulation of Hg is especially problematic in sensitive landscapes, where inorganic mercury from atmospheric deposition is readily converted, via natural processes, to methylmercury (MeHg), the toxic form...
Wildfire and Earth surface processes
Paul M Santi, Francis K. Rengers
2020, Book chapter, Reference module in earth systems and environmental sciences
Wildfire is a worldwide phenomenon that is expected to increase in extent and severity in the future, due to fuel accumulations, shifting land management practices, and climate change. It immediately affects the landscape by removing vegetation, depositing ash, influencing water-repellent soil...
Council monitoring and assessment program (CMAP): A framework for using the monitoring program inventory to conduct gap assessments for the Gulf of Mexico Region
Julie Bosch, Heidi B Burkart, Bogdan Chivoiu, Randy Clark, Chris Clement, Nicholas Enwright, Steve Giordano, Chris Jeffrey, Ed Johnson, Rheannon Hart, Sarah D Hile, Jacob S Howell, Claudia Laurenzano, Michael Lee, Terrance McCloskey, Terry McTigue, Michelle B Meyers, Katie E Miller, Scott Mize, Mark E. Monaco, Kevin Owen, Richard Rebich, Samuel H. Rendon, Ali Robertson, Thomas Sample, Kelly Marie Sanks, Gregory Steyer, Kevin Suir, Christopher M. Swarzenski, Hana Rose Thurman
2020, NOAA Technical Memorandum 284
Executive Summary Under the Resources and Ecosystem Sustainability, Tourist Opportunities, and Revived Economies of the Gulf Coast States Act of 2012 (RESTORE Act), the Gulf Coast Ecosystem Restoration Council (RESTORE Council or Council) is required to report on the progress of funded projects and programs. Systematic monitoring of restoration at...
Wetlands in agricultural landscapes—Significant findings and recent advances from CEAP-Wetlands
David M. Mushet, William R. Effland
2020, Journal of Soil and Water Conservation (75)
The Wetlands Component of the USDA's Conservation Effects Assessment Project (CEAP-Wetlands) is a multi-agency effort advancing science related to quantifying and interpreting effects and effectiveness of conservation practices and programs on ecosystem services provided by wetlands in agricultural landscapes. This special section originated from a symposium...
Upper Mississippi River system weighted wind fetch analysis (1989, 2000, 2010/2011)
Jason J. Rohweder, James T. Rogala
2020, Report
Wind fetch is defined as the unobstructed distance that wind can travel over water in a constant direction. Fetches are limited by landforms surrounding the body of water. Fetch is an important characteristic of open water because longer fetches can result in larger wind-generated waves. The larger waves, in turn,...
Using hair cortisol to assess physiological stress in Alaska polar bears
George M. Durner
2020, Report
The concentration of cortisol in hair (HCC) of polar bears (Ursus maritimus) may provide a retrospective view of physiological stress they experience and a link to their response to environmental change. To understand this relationship, we assayed HCC from polar bears captured in the Alaska Beaufort, Bering and Chukchi...
On the robustness of annual daily precipitation maxima estimates over Monsoon Asia
Phuong-Loan Nguyen, Margot Bador, Lisa Alexander, Todd P. Lane, Chris Funk
2020, Frontiers in Climate Services (2)
Understanding precipitation extremes over Monsoon Asia is vital for water resource management and hazard mitigation, but there are many gaps and uncertainties in observations in this region. To better understand observational uncertainties, this study uses a high-resolution validation dataset to assess the consistency of the representation of annual daily precipitation...
Farmer behavior under groundwater management scenarios: Implications for groundwater conservation in the Mississippi Alluvial Plain
Mustapha Alhassan, Emily Pindilli, Collin B Lawrence
2020, Water Economics and Policy (6)
Concern about sustained availability of fresh groundwater for agricultural use in the Mississippi Alluvial Plain (MAP) mounts as groundwater levels decline. We evaluate elasticities of demand for groundwater and other agricultural inputs, as well as overall and output specific economies of scale for four major irrigated commodities (rice, corn, soybeans,...
Geochemical assessment of groundwater in the Big Chino subbasin, Arizona, 2011–18
Kimberly R. Beisner, Casey J. R. Jones
2020, Scientific Investigations Report 2020-5094
A geochemical characterization of groundwater in the Big Chino subbasin of Arizona was conducted by the U.S. Geological Survey, in cooperation with the City of Prescott, the Town of Prescott Valley, and the Salt River Project, to understand groundwater evolution through the study area and the source of water to...
Hydrologic properties of a highly permeable firn aquifer in the Wilkins Ice Shelf, Antarctica
Lynn Montgomery, C. Miege, Julie MIller, Bruce Wallin, Ted A. Scambos, Olivia L. Miller, D Kip Solomon, Richard Forster, Lora Koenig
2020, Geophysical Research Letters (47)
We present measurements of the density, hydraulic conductivity, and specific discharge of a widespread firn aquifer in Antarctica, within the Wilkins Ice Shelf. At the field site, the aquifer is 16.2 m thick, starting at 13.4 m from the snow surface and transitioning from water‐saturated firn to ice at 29.6 m. Hydraulic conductivity...
Differences in neonicotinoid and metabolite sorption to activated carbon are driven by alterations to the insecticidal pharmacophore
Danielle T. Webb, Matthew R. Nagorzanski, Megan M Powers, David M. Cwiertny, Michelle L. Hladik, Gregory H. LeFevre
2020, Environmental Science and Technology (54) 14694-14705
Widespread application of neonicotinoids has led to their proliferation in waters. Despite low neonicotinoid hydrophobicity, our prior studies implicated granular activated carbon (GAC) in neonicotinoid removal. Based on known receptor binding characteristics, we hypothesized that the insecticidal pharmacophore influences neonicotinoid sorption. Our objectives were to illuminate drivers of neonicotinoid sorption...
Salinity and inundation effects on productivity of brackish tidal marsh plants in the San Francisco Bay-Delta Estuary
Christopher N. Janousek, Bruce D. Dugger, Brandon M Drucker, Karen M. Thorne
2020, Hydrobiologia (847) 4311-4323
Plant productivity is central to numerous ecosystem functions in tidal wetlands. We examined how productivity of brackish marsh plants in northern California responded to abiotic stress gradients of inundation and salinity using two experimental approaches. In a greenhouse study with varying salinity, shoot production and biomass of Juncus balticus, Schoenoplectus acutus and S. americanus all...
Nitrate in streams during winter low‐flow conditions as an indicator of legacy nitrate
Henry M. Johnson, Edward G. Stets
2020, Water Resources Research (56)
Winter low‐flow (LF) conditions in streams provide a potential opportunity to evaluate the importance of legacy nitrate in catchments due to the dominance of slow‐flow transport pathways and lowered biotic activity. In this study, the concentration, flux, and trend of nitrate in streams during winter low‐flow...
Estimating the effects of forest structure changes from wildfire on snow water resources under varying meteorological conditions
C. David Moeser, Patrick Borxton, Adrian Harpold, Andrew J. Robertson
2020, Water Resources Research (56)
Modeling forest change effects on snow is critical to resource management. However, many models either do not appropriately model canopy structure or cannot represent fine‐scale changes in structure following a disturbance. We applied a 1 m2 resolution energy budget snowpack model at a forested site in New Mexico,...
Modeling water quality in watersheds: From here to the next generation
Baihua Fu, J. S. Horsburgh, Anthony J. Jakeman, C Gaultieri, Todd W. Arnold, Lucy A. Marshall, Tim R Green, Nigel W. T. Quinn, Martin Volk, Randall J. Hunt, L. Vezzaro, Barry Croke, John Jakeman, Valerie O Snow, Brenda Rashleigh
2020, Water Resources Research (56)
In this synthesis, we assess present research and anticipate future development needs in modeling water quality in watersheds. We first discuss areas of potential improvement in the representation of freshwater systems pertaining to water quality, including representation of environmental interfaces, in‐stream water quality and process interactions, soil health and land...
Assessment of burrowing behavior of freshwater juvenile mussels in sediment
Nile E. Kemble, John M. Besser, Jeffery A. Steevens, Jamie P. Hughes
2020, Freshwater Mollusk Biology and Conservation (23) 69-81
Standard laboratory sediment toxicity methods have been adapted for conducting toxicity tests with juvenile freshwater mussels. However, studies looking at juvenile mussel burrowing behavior at the water-sediment interface are limited. Juvenile mussels burrow in sediment for the first 0 to 4 yr of life but also may inhabit the sediment-water...
Topographic, soil, and climate drivers of drought sensitivity in forests and shrublands of the Pacific Northwest, USA
Jennifer M. Cartwright, Caitlin E. Littlefield, Julia Michalak, Joshua J. Lawler, Solomon Dobrowski
2020, Scientific Reports (10)
Climate change is anticipated to increase the frequency and intensity of droughts, with major impacts to ecosystems globally. Broad-scale assessments of vegetation responses to drought are needed to anticipate, manage, and potentially mitigate climate-change effects on ecosystems. We quantified the drought sensitivity of vegetation in the Pacific Northwest, USA, as...
