Detrital zircon geochronology along a structural transect across the Kahiltna assemblage in the western Alaska Range: Implications for emplacement of the Alexander-Wrangellia-Peninsular terrane against North America
Stephen E. Box, Susan M. Karl, James V. Jones III, Dwight Bradley, Peter J. Haeussler, Paul B. O’Sullivan
2019, Geosphere (15) 1774-1808
The Kahiltna assemblage in the western Alaska Range consists of deformed Upper Jurassic and Cretaceous clastic strata that lie between the Alexander-Wrangellia-Peninsular (AWP) terrane to the south, and the Farewell and other peri-cratonic terranes to the north. Differences in detrital zircon populations and sandstone petrography allow geographic separation of the...
A mechanistic understanding of ecological responses to land-use change in headwater streams
Richard H. Walker, Annika W. Walters
2019, Ecosphere (10)
Anthropogenic activities, such as oil and natural gas development (ONGD), have significantly altered the landscape. It is often challenging to identify the mechanistic processes underlying ecological responses to land-use change (LUC). In aquatic ecosystems, alterations to habitat and food availability and water quality associated with increased...
Stormquakes
Wenyuan Fan, Jeffrey J. McGuire, C. D. de Groot-Hedlin, M. A. H. Hedlin, S. Coats, J. W. Fiedler
2019, Geophysical Research Letters (46) 12918
Seismic signals from ocean-solid Earth interactions are ubiquitously recorded on our planet. However, these wavefields are typically incoherent in most frequency bands limiting their utilization for understanding ocean dynamics or solid Earth properties. In contrast, we find that during large storms such as hurricanes and Nor’easters the interaction of long-period...
Plant and insect herbivore community variation across the Paleocene–Eocene boundary in the Hanna Basin, southeastern Wyoming
Lauren E Schmidt, Regan E Dunn, Jason J Mercer, Marieke Dechesne, Ellen D Currano
2019, PeerJ
Ecosystem function and stability are highly affected by internal and external stressors. Utilizing paleobotanical data gives insight into the evolutionary processes an ecosystem undergoes across long periods of time, allowing for a more complete understanding of how plant and insect herbivore communities are affected by ecosystem imbalance. To study how...
Escherichia coli in the Santa Cruz River in Tumacácori National Historical Park, Arizona
Nicholas V. Paretti
2019, Fact Sheet 2019-3065
At Tumacácori National Historical Park in southern Arizona, resource managers are concerned about microbial pathogens in the Santa Cruz River that could pose a serious health risk to employees and visitors. The U.S. Geological Survey recently completed a comprehensive 3-year study of water quality in the Santa Cruz River watershed...
Spatial and temporal distribution of bacterial indicators and microbial-source tracking within Tumacácori National Historical Park and the upper Santa Cruz River, southern Arizona and northern Mexico, 2015–2016
Nicholas V. Paretti, Christopher M. Kephart, Thomas J. Porter, Edyth Hermosillo, Jay R. Cederberg, Justine P. Mayo, Bruce Gungle, Alissa L. Coes, Rachel S. Tucci, Laura M. Norman
2019, Scientific Investigations Report 2019-5108
Tumacácori National Historical Park (TUMA) in southern Arizona protects the culturally important Mission San José de Tumacácori, while also managing a part of the ecologically diverse riparian corridor of the Santa Cruz River. The quality of the water flowing through depends solely on upstream watershed activities, and among the water-quality...
Historic changes to floodplain systems in the Driftless Area
Colin S. Belby, Lindsay J Spigel, Faith A. Fitzpatrick
2019, Book chapter, The physical geography and geology of the Driftless Area: The career and contributions of James C. Knox
Floodplain systems in the Driftless Area have experienced widespread historical transformations in hydrologic and sediment characteristics as well as rates of hydrogeomorphic processes. These changes exceed natural variability experienced during the Holocene and are driven by nearly two centuries of major land-cover alterations coupled with shifting...
Oyster reefs in northern Gulf of Mexico estuaries harbor diverse fish and decapod crustacean assemblages: A meta-synthesis
Megan K. LaPeyre, D. A. Marshall, L. S. Miller, A. T. Humphries
2019, Frontiers in Marine Science (6)
Oyster reefs provide habitat for numerous fish and decapod crustacean species that mediate ecosystem functioning and support vibrant fisheries. Recent focus on the restoration of eastern oyster (Crassostrea virginica) reefs stems from this role as a critical ecosystem engineer. Within the shallow estuaries of the northern Gulf of Mexico (nGoM), the...
Morphodynamic resilience of intertidal mudflats on a seasonal time scale
Mick Van der Wegen, Dano Roelvink, Bruce E. Jaffe
2019, JGR Oceans (124) 8290-8308
Intertidal mudflats are morphodynamic features present in many estuaries worldwide. Often located between vegetated shores and deep channels they comprise valuable ecosystems and serve to protect the hinterland by attenuating waves. Although mudflats are persistently present on yearly to decadal time scales, little is known on their morphodynamic adaptation to...
Holocene Sea-Level Variability from Chesapeake Bay Tidal Marshes
Thomas M. Cronin, Megan K. Clevenger, Neil E. Tibert, Tammy Prescott, Michael Toomey, J. Bradford Hubeny, Mark B. Abbott, Julia Seidenstein, Hannah Whitworth, Samuel R Fisher, Nick Wondolowski, Anna Ruefer
2019, Holocene (29) 1979-1693
We reconstructed the last 10,000 years of Holocene relative sea-level rise (RSLR) from sediment core records in near Chesapeake Bay, eastern U.S.A., including new marsh records from the Potomac and Rappahannock Rivers, Virginia. Results show mean RSLR rates of 2.6 mm yr-1 from 10 to 8 kilo-annum (ka) due...
River water-quality concentration and flux estimation can be improved by accounting for serial correlation through an autoregressive model
Qian Zhang, Robert M. Hirsch
2019, Water Resources Research (55) 9705-9723
Accurate quantification of riverine water‐quality concentration and flux is challenging because monitoring programs typically collect concentration data at lower frequencies than discharge data. Statistical methods are often used to estimate concentration and flux on days without observations. One recently developed approach is the Weighted Regressions on Time, Discharge, and Season...
Infrasound from giant bubbles during explosive submarine eruptions
John J. Lyons, Matthew M. Haney, David Fee, Aaron Wech, Christopher F. Waythomas
2019, Nature Geoscience (12) 952-958
Shallow submarine volcanoes pose unique scientific and monitoring challenges. The interaction between water and magma can create violent explosions just below the surface, but the inaccessibility of submerged volcanoes means they are typically not instrumented. This both increases the risk to marine and aviation traffic and leaves the underlying eruption...
Riverine turtles select habitats maintained by natural discharge regimes in an unimpounded large river
Brian J. Tornabene, Matthew E. Jaeger, Robert G. Bramblett, Mark Nelson, Nathan McClenning, Trevor Watson, Alan Ankrum, Kenneth Frazer, Ann Marie Reinhold, Alexander V. Zale
2019, River Research and Applications (35) 1489-1498
Turtle populations are imperiled worldwide, but limited ecological information from unaltered systems hampers science‐based management and conservation of some species, especially riverine turtles such as the spiny softshell (Apalone spinifera). We therefore investigated movements and spatial habitat selection of 54 A. spinifera in 633 river kilometres (rkm) of the...
Calibration of the USGS National Hydrologic Model in ungauged basins using statistical at-site streamflow simulations
William Farmer, Jacob LaFontaine, Lauren Hay
2019, Journal of Hydrologic Engineering (24)
In the absence of measured streamflow, statistically simulated daily streamflow can be used to support the ability of physical models to represent hydrologic processes at ungauged locations. The objective of this study was to determine the feasibility of using statistical simulations in place of measured streamflow to calibrate physical...
Large loss of CO2 in winter observed across pan-arctic permafrost region
Susan M Natali, Jennifer D. Watts, Stefano Potter, Brendan M. Rogers, Sarah M. Ludwig, Anne-Katrin Selbmann, Patrick F. Sullivan, Benjamin W. Abbott, Kyle A. Arndt, Leah Birch, Mats P. Bjorkman, Anthony Bloom, Gerardo Celis, Torben R. Christiensen, Casper T. Christiansen, Roisin Commane, Elisabeth J. Cooper, Patrick Crill, Claudia Czimczik, Sergey Davydov, Jinyang Du, Jocelyn E. Egan, Bo Elberling, Eugenie S. Euskirchen, Thomas Friborg, Helene Genet, Mathias Gockede, Jordan P. Goodrich, Paul Grogan, Manuel Helbig, Elchin E. Jafarov, Julie Jastrow, Aram Kalhori, Yongwon Kim, John S Kimball, Lars Kutzbach, Mark J. Lara, Klaus S. Larsen, Michael M Loranty, Magnus Lund, Massimo Lupascu, Nima Madani, Avni Malhorta, Jack McFarland, David A. McGuire, Anders Michelson, Christina Minions, Walter C. Oechel, David Olefeldt, Frans-Jan Parmentier, Norbert Pirk, Benjamin Poulter, William L. Quinton, Fereidoun Rezanezhad, David Risk, Torsten Sachs, Kevin Schaefer, Neils M. Schmidt, Edward A. Schuur, Philipp R. Semenchuk, Gaius Shaver, Oliver Sonnentag, Gregory Starr, Claire C. Treat, Mark P. Waldrop, Yihui Wang, Jeffrey Welker, Christian Wille, Xiaofeng Xu, Zhen Zhang, Qianlai Zhuang, Donatella Zona
2019, Nature Climate Change (9) 852-857
Recent warming in the Arctic, which has been amplified during the winter1,<a id="ref-link-section-d35506e2410_1" title="Koenigk, T. et al. Arctic Climate Change in 21st...
Records of engagement and decision making for environmental and socio-ecological challenges
Kristan Cockerill, Pierre D. Glynn, Ilan Chabay, Mahmud Farooque, Raimo Hamalainen, Ben Miyamoto, Patricia McKay
2019, EURO Journal on Decision Processes (7) 243-265
We propose creating and maintaining records of engagement and decision-making (RoED) to help us and our communities better understand ourselves, our goals, our decisions, and the dynamic systems in which we all live. The purpose of RoED is to go well beyond noting that dialogue occurred...
Application of a regional climate model to assess changes in the climatology of the Eastern US and Cuba associated with historic landcover change
Steven W. Hostetler, R Reker, Jay R. Alder, Thomas Loveland, Debra A. Willard, Christopher E. Bernhardt, Eric T. Sundquist, Renee L. Thompson
2019, JGR Atmospheres (124) 11722-11745
We examine the annual, seasonal, monthly, and diurnal climate responses to the land use change (LUC) in eastern United States and Cuba during four epochs (1650, 1850, 1920, and 1992) with ensemble simulations conducted with the RegCM4 regional climate model that includes the Biosphere Atmosphere Transfer Scheme (BATS1e) surface physics...
Dynamically triggered changes of plate interface coupling in Southern Cascadia
Kathryn Materna, Noel Bartlow, Aaron Wech, Charles Williams, Roland Burgmann
2019, Geophysical Research Letters (46) 12890-12899
In Southern Cascadia, precise Global Navigation Satellite System (GNSS) measurements spanning about 15 years reveal steady deformation due to locking on the Cascadia megathrust punctuated by transient deformation from large earthquakes and episodic tremor and slip events. Near the Mendocino Triple Junction, however, we recognize several abrupt GNSS velocity changes...
Quantifying source and sink habitats and pathways in spatially structured populations: A generalized modelling approach
James E. Diffendorfer, Christine Sample, Joanna A Beiri, Benjamin L. Allen, Yulia Dementieva, Alyssa Carson, Connar Higgins, Sadie Piatt, Shirley Qiu, Summer Stafford, Brady J. Mattsson, Darius J. Semmens, Wayne E. Thogmartin
2019, Ecological Modelling (407) 1-10
The ability to classify habitats and movement pathways as sources or sinks is an important part of the decision making process for the conservation of spatially structured populations. Diverse approaches have been used to quantify the importance of habitats and pathways in a spatial network, however these approaches have been...
Global ecological predictors of the soil priming effect
Felipe Bastida, Carlos M. Garcia, Noah Fierer, David J. Eldridge, Matthew A. Bowker, Sebastian R. Abades, Fernando D. Alfaro, Asmeret Asefaw Berhe, Nick A. Cutler, Antonio Gallardo, Laura Garcia-Velazquez, Stephen C. Hart, Patrick E. Hayes, Teresa Hernandez, Zeng-Yei Hseu, Nico Jehmlich, Martin Kirchmair, Hans Lambers, Sigrid Neuhauser, Victor M. Pena-Ramirez, Cecilia A. Perez, Sasha C. Reed, Fernanda Santos, Christina Siebe, Benjamin W. Sullivan, Pankaj Trivedi, Alfonso Vera, Mark A. Williams, Jose M. Moreno, Manuel Delgado-Baquerizo
2019, Nature Communications (10)
Identifying the global drivers of soil priming is essential to understanding C cycling in terrestrial ecosystems. We conducted a survey of soils across 86 globally-distributed locations, spanning a wide range of climates, biotic communities, and soil conditions, and evaluated the apparent soil priming effect using 13C-glucose labeling. Here we show that...
Remote sensing of dryland ecosystem structure and function: Progress, challenges, and opportunities
William K. Smith, Matthew P. Dannenberg, Dong Yan, Stephanie Herrmann, Mallory L. Barnes, Greg A. Barron-Gafford, Joel A. Biederman, Scott Ferrenberg, Andrew M. Fox, Amy R. Hudson, John F. Knowles, Natasha MacBean, David J.P. Moore, Pamela L. Nagler, Sasha C. Reed, William A. Rutherford, Russell L. Scott, Xianfeng Wang, Julia Yang
2019, Remote Sensing of Environment (233)
Drylands make up roughly 40% of the Earth's land surface, and billions of people depend on services provided by these critically important ecosystems. Despite their relatively sparse vegetation, dryland ecosystems are structurally and functionally diverse, and emerging evidence suggests that these ecosystems...
A novel method for the extraction, purification and characterization of noble gases in produced fluids
Rebecca L. Tyne, Peter H Barry, D J Hillegonds, Andrew G. Hunt, Justin T. Kulongoski, Michael J. Stephens, D.J. Byrne, C. J. Ballentine
2019, Geochemistry, Geophysics, Geosystems (20) 5588-5597
Hydrocarbon systems with declining or viscous oil production are often stimulated using enhanced oil recovery (EOR) techniques, such as the injection of water, steam and CO2, in order to increase oil and gas production. As EOR and other methods of enhancing production such as hydraulic fracturing have become more prevalent,...
Mountain-block recharge: A review of current understanding
Katherine Markovich, Andrew H. Manning, Laura Condon, Jennifer McIntosh
2019, Water Resources Research (55) 8278-8304
Mountain-block recharge (MBR) is the subsurface inflow of groundwater to lowland aquifers from adjacent mountains. MBR can be a major component of recharge but remains difficult to characterize and quantify due to limited hydrogeologic, climatic, and other data in the mountain block and at the mountain front. The number of...
Adapterama II: Universal amplicon sequencing on Illumina platforms (TaggiMatrix)
Travis C Glenn, Todd W Pierson, Natalia J Bayona-Vasquez, Troy J. Kieran, Sandra L. Hoffberg, Jesse Thomas, Daniel E. Lefever, John W. Finger Jr., Bei Gao, Xiaoming Bian, Swarnali Louha, Ramya Kolli, Kerin Bentley, Julie Rushmore, Kelvin Wong, Michael Rothrock, Anna M. McKee, Tai L. Guo, Rodney Mauricio, Marirosa Molina, Brian Cummings, Lawrence H. Lash, Kun Lu, Gregory S. Gilbert, Stephen P. Hubbell, Brant C. Faircloth
2019, PeerJ
Next-generation sequencing (NGS) of amplicons is used in a wide variety of contexts. In many cases, NGS amplicon sequencing remains overly expensive and inflexible, with library preparation strategies relying upon the fusion of locus-specific primers to full-length adapter sequences with a single identifying sequence or ligating adapters onto PCR products....
Do parents synchronise nest visits as an antipredator adaptation in birds of New Zealand and Tasmania?
Nyil Khwaja, Melanie Massaro, Thomas E. Martin, James V. Briskie
2019, Frontiers in Ecology and Environment (7)
Birds with altricial offspring need to feed them regularly, but each feeding visit risks drawing attention to the nest and revealing its location to potential predators. Synchronisation of visits by both parents has been suggested as a behavioural adaptation to reduce the risk of nest predation. Under this hypothesis, higher...
