Documentation for the MODFLOW 6 Groundwater Transport Model
Christian D. Langevin, Alden M. Provost, Sorab Panday, Joseph D. Hughes
2022, Techniques and Methods 6-A61
This report documents a new Groundwater Transport (GWT) Model for MODFLOW 6. The GWT Model simulates three-dimensional transport of a single chemical species in fowing groundwater based on a generalized control-volume fnite-difference approach. Although each GWT Model is only able to represent a single chemical species, multiple GWT Models may...
Temperature optimum for marsh resilience and carbon accumulation revealed in a whole ecosystem warming experiment
Alexander J. Smith, Genevieve L. Noyce, J. Patrick Megonigal, Glenn R. Guntenspergen, Matthew L. Kirwan
2022, Global Change Biology (28) 3236-3245
Coastal marshes are globally important, carbon dense ecosystems simultaneously maintained and threatened by sea-level rise. Warming temperatures may increase wetland plant productivity and organic matter accumulation, but temperature-modulated feedbacks between productivity and decomposition make it difficult to assess how wetlands and their thick, organic rich soils...
A novel application of hierarchical modelling to decouple sampling artifacts from socio-ecological effects on poaching intensity
Mahmood Soofi, Ali T. Qashqaei, Jan-Niklas Trei, Shirko Shokri, Javad Selyari, Benjamin Ghasemi, Poorya Sepahvand, Lukas Egli, Bagher Nezami, Navid Zamani, Gholam Hosein Yusefi, Bahram H. Kiabi, Niko Balkenhol, J. Andrew Royle, Chris R. Pavey, Steve M. Redpath, Matthias Waltert
2022, Biological Conservation (267) 1-12
Poaching is a global driver of wildlife population decline, including inside protected areas (PAs). Reducing poaching requires an understanding of its cryptic drivers and accurately quantifying poaching scales and intensity. There is little quantification of how poaching is affected by law enforcement intensity (e.g., ranger stations) versus economic factors (e.g.,...
Multi-task deep learning of daily streamflow and water temperature
Jeffrey Michael Sadler, Alison P. Appling, Jordan Read, Samantha K. Oliver, Xiaowei Jia, Jacob Aaron Zwart, Vipin Kumar
2022, Water Resources Research (58)
Deep learning (DL) models can accurately predict many hydrologic variables including streamflow and water temperature; however, these models have typically predicted hydrologic variables independently. This study explored the benefits of modeling two interdependent variables, daily average streamflow and daily average stream water temperature, together using multi-task DL. A multi-task scaling...
Assessing mineral supply concentration from different perspectives through a case study of zinc
Christine L. Thomas, Nedal T. Nassar, John H. DeYoung Jr.
2022, Mineral Economics (35) 6067-616
Increasing demand for nonfuel mineral commodities has increased concerns regarding the reliability of their supplies. “Criticality” assessments over the past decade have attempted to capture this concern through a set of indicators, the most common of which quantifies the risk associated with market concentration by applying the Herfindahl-Hirschman Index (HHI)...
Water priorities for the Nation—The USGS National Water Dashboard
Mark P. Miller, Thomas E. Burley, Brian E. McCallum
2022, Fact Sheet 2022-3003
The U.S. Geological Survey National Water Dashboard supplies critical information to decision makers, emergency managers, and the public during extreme hydrologic events (such as droughts and floods) and during normal hydrologic conditions. It informs decision making that can help protect lives and property before and during extreme hydrologic events. The...
Visit the U.S. Geological Survey's National Water Dashboard
Mark P. Miller, Thomas E. Burley, Brian E. McCallum
2022, General Information Product 213
The U.S. Geological Survey National Water Dashboard supplies critical information to decision makers, emergency managers, and the public during extreme hydrologic events (such as droughts and floods) and during normal hydrologic conditions. It informs decision making that can help protect lives and property before and during extreme hydrologic events. The...
Contrasting Common Era climate and hydrology sensitivities from paired lake sediment dinosterol hydrogen isotope records in the South Pacific Convergence Zone
Ashley E. Maloney, Julie N. Richey, Daniel B. Nelson, Samantha N Hing, David A. Sear, Jonathan D. Hassall, Peter G. Langdon, Ursula Sichrowsky, Robert Schabetsberger, Atoloto Malau, Jean-Yves Meyer, Ian W. Croudace, Julian P. Sachs
P. Rioual, editor(s)
2022, Quaternary Science Reviews (281) 1-18
Hydroclimate on ‘Uvea (Wallis et Futuna) is controlled by rainfall associated with the South Pacific Convergence Zone (SPCZ), the southern hemisphere's largest precipitation feature. To extend the short observational precipitation record, the hydrogen isotopic composition of the algal lipid biomarker dinosterol (δ2Hdinosterol) was measured in sediment...
Defining relevant conservation targets for the endangered Southern California distinct population segment of the mountain yellow-legged frog (Rana muscosa)
Thierry Chambert, Adam R. Backlin, Elizabeth Gallegos, Bradd Baskerville-Bridges, Robert N. Fisher
2022, Conservation Science and Practice (4)
The endangered mountain yellow-legged frog (Rana muscosa) has been reduced to <10 isolated populations in the wild. Due to frequent catastrophic events (floods, droughts, wildfires), the recent dynamics of these populations have been erratic, making the future of the species highly uncertain. In 2018, a recovery plan was developed to...
Hydrogeology of aquifers within the Fairport-Lyons channel system and adjacent areas in Wayne, Ontario, and Seneca Counties, New York
Richard J. Reynolds, Paul M. Heisig, Kristin S. Linsey
2022, Scientific Investigations Report 2021-5086
A hydrogeologic investigation was undertaken by the U.S. Geological Survey, in cooperation with the New York State Department of Environmental Conservation, within the areas shown in the Macedon, Palmyra, Newark, and Lyons 7.5-minute quadrangle maps that include parts of Wayne, Ontario, and Seneca Counties in New York. The most productive...
Estimation of lake-scale stock-recruitment models for Great Lakes sea lampreys
Jean V. Adams, Michael L. Jones
2022, Ecological Modelling (467)
Understanding recruitment dynamics is an essential part of effective fisheries management, whether the focus is on conservation, harvest policy development, or invasive species control. We developed a model that estimates lake-wide Ricker stock-recruitment relations for invasive sea lampreys (Petromyzon marinus) in each of the five Laurentian Great Lakes to inform future control efforts....
Bedrock geochemistry and alteration history of the clay-bearing Glen Torridon region of Gale crater, Mars
Erwin Dehouck, Agnes Cousin, Nicolas Mangold, Jens Frydenvang, Olivier Gasnault, Olivier Forni, William Rapin, Patrick J. Gasda, Gwenael Caravaca, Gael David, Candice C. Bedford, Jeremie Lasue, Pierre-Yves Meslin, Kristin Rammelkamp, Marine Desjardins, Stephane Le Mouelic, Michael T. Thorpe, Valerie K. Fox, Kristen A. Bennett, Alexander Bryk, Nina L. Lanza, Sylvestre Maurice, Roger C. Wiens
2022, Journal of Geophysical Research E: Planets (127)
Glen Torridon is a topographic trough located on the slope of Aeolis Mons, Gale crater, Mars. It corresponds to what was previously referred to as the “clay-bearing unit”, due to the relatively strong spectral signatures of clay minerals (mainly ferric smectites) detected from orbit. Starting in January 2019, the Curiosity...
Brook Floater restoration: Identifying locations to reintroduce or augment populations with propagated mussels
Allison H. Roy, Emily Bjerre, Jonathon Cummings, Kevin Kalasz, Jason Carmignani, Peter Hazelton, Morgan Kern, David Perkins, Laura Saucier, Ayla J. Skorupa, Rachel Katz, Christy C. Coghlan
2022, Cooperator Science Series CSS-141-2022
In February 2020, we held a workshop where we sought to identify where states should reintroduce or augment brook floater to minimize the probability of extinction within a state. We focused on Massachusetts and Connecticut, two states with only a few, small populations still extant, that likely need population restoration...
An efficient, analytic solution using order statistics for probabilistic seismic‐hazard assessment without the Poisson assumption
Andrew J. Michael, Andrea L. Llenos
2022, Bulletin of the Seismological Society of America (112) 1678-1693
Standard approaches to probabilistic seismic‐hazard assessment (PSHA) assume that earthquakes are random, independent events that follow a Poisson distribution of occurrences in a given time period (Cornell, 1968). To overcome the limitations of the Poisson assumption, such as ignoring earthquake...
Calibration of an evapotranspiration algorithm in a semiarid sagebrush steppe using a 3-ha lysimeter and Landsat normalized difference vegetation index data
Christopher J. Jarchow, William J. Waugh, Pamela L. Nagler
2022, Ecohydrology (15)
In arid and semiarid environments, evapotranspiration (ET) is the primary discharge component in the water balance, with potential ET exceeding precipitation. For this reason, reliable estimates of ET are needed to construct accurate water budgets in these environments. Remote sensing affords the ability to provide fast,...
Assessing the accuracy and potential for improvement of the national land cover database’s tree canopy cover dataset in urban areas of the conterminous United States
Mehdi Heris, Kenneth J. Bagstad, Austin Troy, Jarlath O’Neil-Dunne
2022, Remote Sensing (14)
The National Land Cover Database (NLCD) provides time-series data characterizing the land surface for the United States, including land cover and tree canopy cover (NLCD-TC). NLCD-TC was first published for 2001, followed by versions for 2011 (released in 2016) and 2011 and 2016 (released in 2019). As...
Planning and operations of the Hydrate 01 Stratigraphic Test Well, Prudhoe Bay Unit, Alaska North Slope
Timothy S. Collett, Margarita V. Zyrianova, Norihiro Okinaka, Motoi Wakatsuki, Ray Boswell, Scott Marsteller, David Minge, Stephen Crumley, David Itter, Robert D. Hunter, Ana Garcia-Ceballos, Ge Jin
2022, Journal of Energy and Fuels (36) 3016-3039
The National Energy Technology Laboratory, the Japan Oil, Gas and Metals National Corporation, and the U.S. Geological Survey are leading an effort to conduct an extended gas hydrate production test in northern Alaska. The proposed production test required the drilling of an initial stratigraphic test well...
Human and ecosystem health in coastal systems
Nicole Elko, Diane Foster, Gregory Kleinheinz, Britt Raubenheimer, Suzanne Brander, Julie Kinzelman, Jacob P. Kritzer, Daphne Munroe, Curt D. Storlazzi, Marta Sutula, Annie Mercer, Scott Coffin, Carolyn Fraioli, Luke Ginger, Elise Morrison, Gabrielle Parent-Doliner, Cigdem Akan, Alberto Canestrelli, Michelle DiBenedetto, Jackelyn Lang, Jonathan Simm
2022, Shore and Beach (90) 64-91
U.S. coastal economies and communities are facing an unprecedented and growing number of impacts to coastal ecosystems including beach and fishery closures, harmful algal blooms, loss of critical habitat, as well as shoreline damage. This paper synthesizes our present understanding of the dynamics of human and ecosystem health in coastal...
Northern long-eared bats in the central Appalachians following white-nose syndrome: Failed maternity colonies?
Nicholas J. Kalen, Michael S. Muthersbaugh, Joshua B. Johnson, Alexander Silvis, W. Mark Ford
2022, Journal of the Southeastern Association of Fish and Wildlife Agencies (9) 159-167
Northern long-eared bat (Myotis septentrionalis) populations have experienced severe declines in eastern North America from white-nose syndrome (WNS), yet potential secondary effects on maternity roosting and recruitment remain largely unknown. We documented female day- roosting at two locations in the central Appalachians of Virginia, Back Creek Mountain (BCM) and Rapidan Camp...
Multiple resource limitation of dryland soil microbial carbon cycling on the Colorado Plateau
Ryan T. Choi, Sasha C. Reed, Colin Tucker
2022, Ecology (103)
Understanding interactions among biogeochemical cycles is increasingly important as anthropogenic alterations of global climate and of carbon (C), nitrogen (N), and phosphorus (P) cycles interactively affect the Earth system. Ecosystem processes in the dryland biome, which makes up over 40% of Earth's terrestrial surface, are often distinctively sensitive to small...
What drought means for southwestern landscapes
Kimberly Samuels-Crow, Kiona Ogle, Emily C. Palmquist
2022, Newsletter
Introduction Each year, more than 20,000 people raft the Grand Canyon, many of whom will experience this iconic landscape for the first and only time. Visitors to our region for their once-in-a-lifetime Grand Canyon experience might be surprised to see forests and wetlands in addition to deserts. While locals are...
Status and trends of the Lake Huron prey fish community, 1976-2019
Darryl W. Hondorp, Timothy P. O’Brien, Peter C. Esselman, Edward F. Roseman
2022, Report
The USGS Great Lakes Science Center has assessed annual changes in the offshore prey fish community of Lake Huron since 1973. Assessments are based on a bottom trawl survey conducted in October of each year and an acoustics-midwater trawl survey, which began in 2004 and is conducted in September-October. Both...
Monitoring for adaptive management of burned sagebrush-steppe rangelands: addressing variability and uncertainty on the 2015 Soda Megafire
Matthew J. Germino, Peter Torma, Matthew Fisk, Cara Applestein
2022, Rangelands (44) 99-110
• Use of adaptive management supported by robust monitoring is vital to solving severe rangeland problems, such as the exotic annual grass invasion and fire cycle in sagebrush-steppe rangelands.• Uncertainty in post-fire plant-community composition and plant response to treatments poses a challenge to land management and research but can be...
Why are human-black bear conflicts increasing? Assessing the mechanisms driving conflicts in Durango, Colorado
Heather E. Johnson
2022, Newsletter
No abstract available....
Distribution probability of the Virginia northern flying squirrel in the High Allegheny Mountains
W. Mark Ford, Corinne A. Diggins, Jesse L. De La Cruz, Alexander Silvis
2022, Journal of the Southeastern Association of Fish and Wildlife Agencies (9) 168-175
In the central Appalachians of Virginia and West Virginia, the Virginia northern flying squirrel (Glaucomys sabrinus fuscus; VNFS) is a subspecies of northern flying squirrel generally associated with red spruce (Picea rubens)-dominated forests at high elevations. Listed as endangered by theU.S. Fish and Wildlife Service from 1985 to 2013, the...
