Upper Colorado River Basin 20th century droughts under 21st century warming: Plausible scenarios for the future
Connie A. Woodhouse, Rebecca M. Smith, Stephanie A. McAfee, Gregory T. Pederson, Gregory J. McCabe, W. Paul Miller, Adam Csank
2021, Climate Services (21)
This study builds on a collaboration with a water resource management community of practice in the Upper Colorado River Basin to develop scenarios of future drought and assess impacts on water supply reliability. Water managers are concerned with the impacts of warming on water year streamflow, but uncertainties in projections...
The normal faulting 2020 Mw5.8 Lone Pine, Eastern California earthquake sequence
Egill Hauksson, Brian J. Olsen, Alex R. Grant, Jennifer R Andrews, Angela I. Chung, Susan E. Hough, Hiroo Kanamori, Sara K. McBride, Andrew J. Michael, Morgan T. Page, Zachary E. Ross, Deborah Smith, Sotiris Valkaniotis
2021, Seismological Research Letters (92) 679-698
The 2020 Mw">Mw 5.8 Lone Pine earthquake, the largest earthquake on the Owens Valley fault zone, eastern California, since the nineteenth century, ruptured an extensional stepover in that fault. Owens Valley separates two normal‐faulting...
Evidence of post-breeding prospecting in a long-distance migrant.
Max Ciaglo, Ross Calhoun, Scott W Yanco, Michael B. Wunder, Craig A. Stricker, Brian D Linkhart
2021, Ecology and Evolution (11) 599-611
Organisms assess biotic and abiotic cues at multiple sites when deciding where to settle. However, due to temporal constraints on this prospecting, the suitability of available habitat may be difficult for an individual to assess when cues are most reliable, or at the time they are making settlement decisions....
Self-limitation of sand storage in a bedrock-canyon river arising from the interaction of flow and grain size
David J. Topping, Paul E. Grams, Ronald E. Griffiths, David J. Dean, Scott Wright, Joel A. Unema
2021, Journal of Geophysical Research Earth Surface (126)
Bedrock-canyon rivers tend to be supply limited because they are efficient transporters of sediment and not because the upstream supply of sediment is small. A byproduct of this supply limitation is that the finer alluvium stored in these rivers has shorter residence times and smaller volumes than...
Effects of postfire climate and seed availability on postfire conifer regeneration
Joseph A E Stewart, Phillip J. van Mantgem, Derek J N Young, Kristen L. Shive, Haiganoush K. Preisler, Adrian Das, Nathan L. Stephenson, Jon Keeley, Hugh D. Safford, Micah C. Wright, Kevin R Welch, James H. Thorne
2021, Ecological Applications (31)
Large, severe fires are becoming more frequent in many forest types across the western United States and have resulted in tree mortality across tens of thousands of hectares. Conifer regeneration in these areas is limited because seeds must travel long distances to reach the interior of...
Numerical simulations of the geospace response to the arrival of an idealized perfect interplanetary coronal mass ejection
Daniel T. Welling, Jeffrey J. Love, E. Joshua Rigler, Denny M. Oliveira, Colin M. Komar, Steven Morley
2021, Space Weather (19)
Previously, Tsurutani and Lakhina (2014, https://doi.org/10.1002/2013GL058825) created estimates for a “perfect” interplanetary coronal mass ejection and performed simple calculations for the response of geospace, including . In this study, these estimates are used to drive a coupled magnetohydrodynamic-ring current-ionosphere model of geospace to obtain more physically...
Behavioral responses across a mosaic of ecosystem states restructure a sea otter–urchin trophic cascade
Joshua G Smith, Joseph A. Tomoleoni, Michelle M. Staedler, Sophia Lyon, Jessica Fujii, M. Tim Tinker
2021, PNAS (118)
Consumer and predator foraging behavior can impart profound trait-mediated constraints on community regulation that scale up to influence the structure and stability of ecosystems. Here, we demonstrate how the behavioral response of an apex predator to changes in prey behavior and condition can dramatically alter the role and relative contribution...
A replication of proximity to chronic wasting disease, perceived risk, and social trust in managing agency between hunters in Minnesota and Illinois
Kyle Smith, Susan A. Schroeder, Adam Landon, Louis J. Cornicelli, Leslie McInenly, David C. Fulton
2021, Human Dimensions of Wildlife (26) 503-506
No abstract available. ...
Revisiting California’s past great earthquakes and long-term earthquake rate
Susan E. Hough, Morgan T. Page, Leah Salditch, Molly M. Gallahue, Madeleine C. Lucas, James S. Neely, Seth Stein
2021, Bulletin of the Seismological Society of America (111) 356-370
In this study, we revisit the three largest historical earthquakes in California—the 1857 Fort Tejon, 1872 Owens Valley, and 1906 San Francisco earthquakes—to review their published moment magnitudes, and compare their estimated shaking distributions with predictions using modern ground‐motion models (GMMs) and ground‐motion intensity conversion equations. Currently accepted moment magnitude...
Modeling areal measures of campsite impacts on the Appalachian National Scenic Trail to enhance ecological sustainability
Johanna R. Arredondo, Jeffrey L. Marion, Fletcher P. Meadema, Jeremy F. Wimpey
2021, Journal of Environmental Management (279)
Campsite impacts in protected natural areas are most effectively minimized by a containment strategy that focuses use on a limited number of sustainable campsites that spatially concentrate camping activities. This research employs spatial autoregressive (SAR) modeling to evaluate the relative influence...
Limited mantle hydration by bending faults at the Middle America Trench
Nathaniel C. Miller, Danile Lizarralde, John A. Collins, Steven Holbrook, Harm van Avendonk
2021, Journal of Geophysical Research (25)
Seismic anisotropy measurements show that upper mantle hydration at the Middle America Trench (MAT) is limited to serpentinization and/or water in fault zones, rather than distributed uniformly. Subduction of hydrated oceanic lithosphere recycles water back into the deep mantle, drives arc volcanism, and affects seismicity at...
Performance of the ecosystem demography model (EDv2.2) in simulating gross primary production capacity and activity in a dryland study area
Hamid Dashti, Karun Pandit, Nancy F. Glenn, Douglas J. Shinneman, Gerald N. Flerchinger, Andrew A. Hudak, Marie Anne de Graaf, Alejandro N Flores, Susan L. Ustin, Nayani Ilangakoon, Aaron W. Fellows
2021, Agricultural and Forest Meteorology (297)
Dryland ecosystems play an important role in the global carbon cycle, including regulating the inter-annual global carbon sink. Dynamic global vegetation models (DGVMs) are essential tools that can help us better understand carbon cycling in different ecosystems. Currently, there is limited knowledge of the performance of these models in drylands...
Heed the data gap: Guidelines for using incomplete datasets in annual stream temperature analyses
Zachary C. Johnson, Brittany G. Johnson, Martin A. Briggs, Craig D. Snyder, Nathaniel P. Hitt, Warren Devine
2021, Ecological Indicators (122)
Stream temperature data are useful for deciphering watershed processes important for aquatic ecosystems. Accurately extracting signal trends from stream temperature is essential for predicting responses of environmental and ecological indicators to change. Missing data periods are common for various reasons, and...
High elevation ice patch documents Holocene climate variability in the northern Rocky Mountains
Nathan J. Chellman, Gregory T. Pederson, Craig Lee, Dave McWethy, Kathryn Pusman, Jeffery R. Stone, Sabrina R. Brown, Joseph R. McConnell
2021, Quaternary Science Advances (3)
Paleoclimate records from ice cores generally are considered to be the most direct indicators of environmental change, but are rare from mid-latitude, continental regions such as the western United States. High-elevation ice patches are known to be important archaeological archives in alpine regions and potentially could provide records important for...
Site response, basin amplification, and earthquake stress drops in the Portland, Oregon area
Arthur D. Frankel, Alex R. Grant
2021, Bulletin of the Seismological Society of America (111) 671-685
Site response, sedimentary basin amplification, and earthquake stress drops for the Portland, Oregon area were determined using accelerometer recordings at 16 sites of 10 local earthquakes with MD">MDMD 2.6–4.0. A nonlinear inversion was...
Novel diagnostic tests for the putative agent of bacterial gill disease in Pacific razor clams (Siliqua patula)
Brooke A Travis, William N. Batts, Maya Groner, Paul Hershberger, Steven C. Fradkin, Carla M. Conway, Linda Park, Maureen K. Purcell
2021, Journal of Invertebrate Pathology (178)
Nuclear inclusion X (NIX) is a gamma proteobacteria that infects the nuclei of gill epithelial cells in Pacific razor clams. NIX has been associated with clam die-offs in coastal Washington. A quantitative PCR (qPCR) assay was developed to detect NIX in Pacific razor clams, and assay specificity was confirmed by chromogenic in...
Spatial patterns and drivers of nonperennial flow regimes in the contiguous United States
John C. Hammond, Margaret Zimmer, Margaret Shanafield, Kendra E. Kaiser, Sarah E Godsey, Meryl C. Mims, Samuel Zipper, Ryan Burrow, Stephanie K. Kampf, Walter Dodds, C. Nathan Jones, Corey Krabbenhoft, Kate Boersma, Thibault Datry, Julian D. Olden, George H. Allen, Adam N. Price, Katie H. Costigan, Rebecca Hale, Adam S Ward, Daniel Allen
2021, Geophysical Research Letters (48)
Over half of global rivers and streams lack perennial flow, and understanding the distribution and drivers of their flow regimes is critical for understanding their hydrologic, biogeochemical, and ecological functions. We analyzed nonperennial flow regimes using 540 U.S. Geological Survey watersheds across the contiguous United States from 1979 to 2018....
The 2018 update of the US National Seismic Hazard Model: Additional period and site class data
Allison Shumway, Mark D. Petersen, Peter M. Powers, Sanaz Rezaeian, Kenneth S. Rukstales, Brandon Clayton
2021, Earthquake Spectra (37) 1145-1161
As part of the update of the 2018 National Seismic Hazard Model (NSHM) for the conterminous United States (CONUS), new ground motion and site effect models for the central and eastern United States were incorporated, as well as basin depths from local seismic velocity models in four western US (WUS)...
Pesticides and pesticide degradates in groundwater used for public supply across the United States: Occurrence and human-health context
Laura M. Bexfield, Kenneth Belitz, Bruce D. Lindsey, Patricia Toccalino, Lisa H. Nowell
2021, Environmental Science & Technology (55) 362-372
This is the first assessment of groundwater from public-supply wells across the United States to analyze for >100 pesticide degradates and to provide human-health context for degradates without benchmarks. Samples from 1204 wells in aquifers representing 70% of the volume pumped for drinking supply were analyzed for 109 pesticides (active...
Determination of four arsenic species in environmental water samples by liquid chromatography- inductively coupled plasma - tandem mass spectrometry
Sarah Stetson, Caitlyn Margaret Lawrence, Susan Melissa Whitcomb, Christopher J. Kanagy
2021, MethodsX (8)
Robust and sensitive methods for monitoring inorganic and organic As species As(III), As(V), dimethylarsinate (DMA), and monomethylarsonate (MMA) in environmental water are necessary to understand the toxicity and redox processes of As in a specific environment. The method is sufficiently sensitive and selective to ensure accurate and precise quantitation of...
Direct observation of the depth of active groundwater circulation in an alpine watershed
Andrew H. Manning, Lyndsay B. Ball, Richard Wanty, Kenneth H. Williams
2021, Water Resources Research (57)
The depth of active groundwater circulation is a fundamental control on stream flows and chemistry in mountain watersheds, yet it remains challenging to characterize and is rarely well constrained. We collected hydraulic conductivity, hydraulic head, temperature, chemical, noble gas, and 3H/3He groundwater age data from discrete levels in two boreholes 46...
The Alaska convergent margin backstop splay fault zone, a potential large tsunami generator between the frontal prism and continental framework
Roland von Huene, John J. Miller, Anne Krabbenhoeft
2021, Geochemistry, Geophysics, and Geosystems (22)
The giant tsunami that swept the Pacific from Alaska to Antarctica in 1946 was generated along one of three Alaska Trench instrumentally recorded aftershock areas following great and giant earthquakes. Aftershock areas were investigated during the past decade with multibeam bathymetry, ocean bottom seismograph wide‐angle seismic, reprocessed legacy, and new...
Pervasive low-velocity layer atop the 410-km discontinuity beneath the northwest Pacific subduction zone: Implications for rheology and geodynamics
Guangjie Han, Juan Li, Guangrui Guo, Walter D. Mooney, Shun-Ichiro Karato, David A. Yuen
2021, Earth and Planetary Science Letters (554)
Regional triplication waveforms of five intermediate-depth events are modeled to simultaneously obtain the compressional (P) and shear (SH) wave velocity structure beneath northwestern Pacific subduction zone. Both the P- and SH-wave velocity models for three different sub-regions show a low-velocity layer (LVL) with a thickness of ∼55-80 km lying above the...
Permafrost promotes shallow groundwater flow and warmer headwater streams
Ylva Sjoberg, Adam K. Janke, S Painter, E. Coonradt, Michael P. Carey, Jonathan A. O’Donnell, Joshua C. Koch
2021, Water Resources Research (57)
The presence of permafrost influences the flow paths of water through Arctic landscapes and thereby has the potential to impact stream discharge and thermal regimes. Observations from eleven headwater streams in Alaska showed that July water temperatures were higher in catchments with more near‐surface permafrost. We apply a fully coupled...
Seasonal periphyton response to low-level nutrient exposure in a least disturbed mountain stream, the Buffalo River, Arkansas
Billy Justus, Lucas Driver, David R. L. Burge
2021, Ecological Indicators (121)
Like most streams located in the Ozark Plateaus, the Buffalo River in Arkansas generally has excellent water quality. Water-quality conditions in Big Creek, however, a major tributary of the middle Buffalo River, have been less favorable than that of other Buffalo...
