Long-term ecosystem and biogeochemical research in Loch Vale watershed, Rocky Mountain National Park, Colorado
Jill S. Baron, David W. Clow, Isabella A. Oleksy, Timothy Weinmann, Caitlin Charlton, Amanda Jayo
2021, Hydrological Processes (35)
Loch Vale watershed was instrumented in 1983 with initial support from the National Acid Precipitation Assessment Program to ask whether ecosystems of Rocky Mountain National Park (RMNP) were affected by acidic atmospheric deposition. Research and monitoring activities were expanded in 1991 by the U.S. Geological Survey...
No ring fracture in Mono Basin, California
Edward Hildreth, Judith Fierstein, Juliet Ryan-Davis
2021, Geological Society of America Bulletin (133) 2210-2225
In Mono Basin, California, USA, a near-circular ring fracture 12 km in diameter was proposed by R.W. Kistler in 1966 to have originated as the protoclastic margin of the Cretaceous Aeolian Buttes pluton, to have been reactivated in the middle Pleistocene, and to have influenced the arcuate trend of the...
Hydrographic and benthic mapping—St. Croix National Scenic Riverway—Osceola landing
Jenny L. Hanson, Jayme Stone
2021, Open-File Report 2020-1149
High-resolution topographic and bathymetric mapping can assist in the analysis of river habitat. The National Park Service has been planning to relocate a boat ramp along the St. Croix River in Minnesota, across the river from the town of Osceola, Wisconsin, to improve visitor safety, improve operations for commercial use,...
Rangeland fractional components across the western United States from 1985 to 2018
Matthew B. Rigge, Collin Homer, Hua Shi, Debbie Meyer, Brett Bunde, Brian J. Granneman, Kory Postma, Patrick Danielson, Adam Case, George Z. Xian
2021, Remote Sensing (13)
Monitoring temporal dynamics of rangelands to detect and understand change in vegetation cover and composition provides a wealth of information to improve management and sustainability. Remote sensing allows the evaluation of both abrupt and gradual rangeland change at unprecedented spatial and temporal extents. Here, we describe the production of the...
Decadal-scale hotspot methane ebullition within lakes following abrupt permafrost thaw
K.W. Anthony, P. Lindgren, P. Hanke, M. Engram, P. Anthony, R. Daanen, A. Bondurant, A.K. Liljedahl, J. Lenz, G. Grosse, B.M. Jones, L. S. Brosius, Stephanie R. James, Burke J. Minsley, Neal Pastick, J. Munk, J. P. Chanton, C.E. Miller, F.J. Meyer
2021, Environmental Research Letters (16)
Thermokarst lakes accelerate deep permafrost thaw and the mobilization of previously frozen soil organic carbon. This leads to microbial decomposition and large releases of carbon dioxide (CO2) and methane (CH4) that enhance climate warming. However, the time scale of permafrost-carbon emissions following thaw is not well known...
Machine learning predicted redox conditions in the glacial aquifer system, northern continental United States
Melinda L. Erickson, Sarah M. Elliott, Craig J. Brown, Paul E. Stackelberg, Katherine Marie Ransom, James E. Reddy
2021, Water Resources Research (57)
Groundwater supplies 50% of drinking water worldwide and 30% in the United States. Geogenic and anthropogenic contaminants can, however, compromise water quality, thus limiting groundwater availability. Reduction/oxidation (redox) processes and redox conditions affect groundwater quality by influencing the mobility and transport of common geogenic and anthropogenic contaminants....
Interrupted incubation: How dabbling ducks respond when flushed from the nest
Rebecca Croston, C. Alex Hartman, Mark P. Herzog, Sarah H. Peterson, Jeffrey Kohl, Cory T. Overton, Cliff L. Feldheim, Michael L. Casazza, Josh T. Ackerman
2021, Ecology and Evolution (11) 2862-2872
Nesting birds must provide a thermal environment sufficient for egg development while also meeting self‐maintenance needs. Many birds, particularly those with uniparental incubation, achieve this balance through periodic incubation recesses, during which foraging and other self‐maintenance activities can occur. However, incubating birds may experience disturbances such...
Atmospheric nitrogen deposition in the Chesapeake Bay watershed: A history of change
Douglas A. Burns, Gopal Bhatt, Lewis C. Linker, Jesse Bash, Paul Capel, Gary W. Shenk
2021, Atmospheric Environment (251)
The Chesapeake Bay watershed has been the focus of pioneering studies of the role of atmospheric nitrogen (N) deposition as a nutrient source and driver of estuarine trophic status. Here, we review the history and evolution of scientific investigations of the role of atmospheric N deposition, examine trends from wet...
Temporal influences on selenium partitioning, trophic transfer, and exposure in a major U.S. river
Jessica E Brandt, James Roberts, Craig A. Stricker, Holly Rogers, Patricia Nease, Travis S. Schmidt
2021, Environmental Science and Technology (55) 3645-3656
Hydrologic and irrigation regimes mediate the timing of selenium (Se) mobilization to rivers, but the extent to which patterns in Se uptake and trophic transfer through recipient food webs reflect the temporal variation in Se delivery is unknown. We investigated Se mobilization, partitioning, and trophic transfer along approximately 60 river...
Redefining the age of the lower Colorado River, southwestern United States
Ryan S. Crow, J. Schwing, K. E. Karlstrom, M. Heizler, P. A. Pearthree, P. K. House, S. Dulin, S. U. Janecke, Mark E. Stelten, L. J. Crossey
2021, Geology (49) 635-640
Sanidine dating and magnetostratigraphy constrain the timing of integration of the lower Colorado River (southwestern United States and northern Mexico) with the evolving Gulf of California. The Colorado River arrived at Cottonwood Valley (Nevada and Arizona) after 5.24 Ma (during or after the Thvera subchron). The river reached the proto–Gulf...
Evaluating fish rescue as a drought adaptation strategy using a life cycle modeling approach for imperiled coho salmon
Brittany A Beebe, Kale T Bentley, Thomas W. Buehrens, Russell Perry, Jonathan B. Armstrong
2021, North American Journal of Fisheries Management (41) 3-18
Projected intensification of drought as a result of climate change may reduce the capacity of streams to rear fish, exacerbating the challenge of recovering salmonid populations listed under the Endangered Species Act. Without management intervention, some stocks will likely go extinct as stream drying and fragmentation reduce juvenile survival to...
Discovery of a large subsoil nitrate reservoir in an arroyo floodplain and associated aquifer contamination
Benjamin Shawn Linhoff, John Joseph Lunzer
2021, Geology (49) 667-671
In an area of elevated nitrate (NO3) groundwater concentrations in the northern Chihuahuan Desert in central New Mexico (United States), a large reservoir of nitrate was found in the subsoil of an arroyo floodplain. Nitrate inventories in the floodplain subsoils ranged from 10,000 to 38,000...
Estimating blue carbon sequestration under coastal management scenarios
Monica Mei Jeen Moritsch, Mary Alida Young, Paul Carnell, Peter I Macreadie, Catherine E. Lovelock, Emily Nicholson, Peter T. Raimondi, Lisa M. Wedding, Daniel Ierodiaconou
2021, Science of the Total Environment (777)
Restoring and protecting “blue carbon” ecosystems - mangrove forests, tidal marshes, and seagrass meadows - are actions considered for increasing global carbon sequestration. To improve understanding of which management actions produce the greatest gains in sequestration, we used a spatially explicit model to compare carbon sequestration and its economic...
Using decision science for monitoring threatened western snowy plovers to inform recovery
Bruce G. Marcot, James E. Lyons, Daniel C Elbert, Laura Todd
2021, Animals (11)
Western Snowy Plovers (Charadrius nivosus nivosus) are federally listed under the US Endangered Species Act as Threatened. They occur along the US Pacific coastline and are threatened by habitat loss and destruction and excessive levels of predation and human disturbance. Populations have been monitored since the...
Extreme Quaternary plate boundary exhumation and strike slip localized along the southern Fairweather fault, Alaska, USA
Richard O. Lease, Peter J. Haeussler, Robert C. Witter, Daniel F. Stockli, Adrian Bender, Harvey Kelsey, Paul O’Sullivan
2021, Geology (49) 602-606
The Fairweather fault (southeastern Alaska, USA) is Earth’s fastest-slipping intracontinental strike-slip fault, but its long-term role in localizing Yakutat–(Pacific–)North America plate motion is poorly constrained. This plate boundary fault transitions northward from pure strike slip to transpression where it comes onshore and undergoes a <25°, 30-km-long restraining double bend. To...
A combined microbial and ecosystem metric of carbon retention efficiency explains land cover-dependent soil microbial biodiversity–ecosystem function relationships
Jessica G. Ernakovich, Jeffrey R Baldock, Courtney Creamer, Jonathan Sanderman, Karsten Kalbitz, Mark Farrell
2021, Biogeochemistry Letters (153) 1-15
While soil organic carbon (C) is the foundation of productive and healthy ecosystems, the impact of the ecology of microorganisms on C-cycling remains unknown. We manipulated the diversity, applied here as species richness, of the microbial community present in similar soils on two contrasting land-covers—an adjacent pasture and forest—and observed...
Amateur radio operators help fill earthquake donut holes
David J. Wald, Vince Quitoriano, Oliver Dully
2021, Eos, American Geophysical Union (102)
If you’ve ever seen tall antennas rising from everyday residences in your community and wondered what they are for, it could be that those homes belong to ham radio enthusiasts who enjoy communicating with each other over the airwaves. In addition to having fun with their radios and finding camaraderie, many ham...
Riverscape nesting dynamics of Neosho Smallmouth Bass: To cluster or not to cluster?
Andrew D. Miller, Shannon K. Brewer
2021, Diversity and Distributions (27) 1005-1018
AimHierarchical stream habitat conditions influence patterns of fish abundance and population dynamics. The spawning period is important for stream fishes but coincides with unpredictable environmental conditions and stressors. Thus, identifying habitats that confer suitable spawning is crucial to managing vulnerable fish populations, including narrow-range endemics. Here, we...
Local explosion detection and infrasound localization by reverse time migration using 3-D finite-difference wave propagation
David Fee, Liam Toney, Keehoon Kim, Richard Sanderson, Alexandra M. Iezzi, Robin S Matoza, Silvio DeAngelis, Art Jolly, John J. Lyons, Matthew M. Haney
2021, Frontiers in Earth Science (9)
Infrasound data are routinely used to detect and locate volcanic and other explosions, using both arrays and single sensor networks. However, at local distances (<15 km) topography often complicates acoustic propagation, resulting in inaccurate acoustic travel times leading to biased source locations when assuming straight-line propagation. Here we...
Gulf of Mexico blue hole harbors high levels of novel microbial lineages
N.V. Patin, Z.A. Dietrich, A. Stancil, M. Quinan, J.S. Beckler, E. R. Hall, J Culter, Christopher G. Smith, Martial Taillefert, F.J. Stewart
2021, Interational Society of Microbial Ecology (ISME) Journal (15) 2206-2232
Exploration of oxygen-depleted marine environments has consistently revealed novel microbial taxa and metabolic capabilities that expand our understanding of microbial evolution and ecology. Marine blue holes are shallow karst formations characterized by low oxygen and high organic matter content. They are logistically challenging to sample, and thus our understanding of...
Azorella compacta's long-term growth rate, longevity, and potential for dating geomorphological and archaeological features in the arid southern Peruvian Andes
Christopher Harpel, Catherine Kleier, Rigoberto Aguilar
2021, Journal of Arid Environments (188)
We determine the long-term growth rate and longevity of an Azorella compacta growing on Misti volcano, near Arequipa, Peru to investigate the species' capacity as a geochronological resource. Using 14C dating on stem pieces sequestered within the plant's cushion, which grows larger through time, we obtain ages of 15 ± 15 14C yrs BP and 165 ± 15 14C...
Long-term trends in regional wet mercury deposition and lacustrine mercury concentrations in four lakes in Voyageurs National Park
Mark E. Brigham, David D. VanderMeulen, Collin A. Eagles-Smith, David P. Krabbenhoft, Ryan P. Maki, John F. DeWild
2021, Applied Sciences (11)
Although anthropogenic mercury (Hg) releases to the environment have been substantially lowered in the United States and Canada since 1990, concerns remain for contamination in fish from remote lakes and rivers where atmospheric deposition is the predominant source of mercury. How have aquatic ecosystems responded? We report on one of...
NASA's surface biology and geology designated observable: A perspective on surface imaging algorithms
Kerry Cawse-Nicholson, Philip A. Townsend, David Schimel, Ali M Assiri, Pamela L. Blake, Maria Fabrizia Buongiorno, Petya Campbell, Nimrod Carmon, Kimberly Ann Casey, Rosa Elvira Correa-Pabon, Kyla M. Dahlin, Hamid Dashti, Philip Dennison, Heidi Dierrsen, Adam Erickson, Joshua B. Fisher, Robert Frouin, Charles K. Gatebe, Hamed Gholizadeh, Michelle M. Gierach, Nancy F. Glenn, James A. Goodman, Daniel Mark Griffith, Liane Guild, Christopher R. Hakkenberg, Eric J. Hochberg, Thomas R.H. Holmes, Chaunmin Hu, Glynn Hulley, Karl F. Huemmrich, Raphael M. Kudela, Raymond F. Kokaly, Christine M. Lee, Roberta E. Martin, Charles E. Miller, Wesley J. Moses, Frank E. Muller-Karger, Joseph P. Ortiz, Daniel B. Otis, Nima Pahlevan, Thomas H. Painter, Ryan Pavlick, Benjamin Poulter, Yi Qi, Vincent J. Realmuto, Dar A. Roberts, Michael E. Schaepman, Fabian D Schneider, Florian M. Schwandner, Shawn P. Serbin, Alexey N. Shiklomanov, E. Natasha Stavros, David R. Thompson, Juan L. Torres-Perez, Kevin R. Turpie, Maria Tzortziou, Susan L. Ustin, Qian Yu, Yusri Yusup, Qingyuan Zhang, The SBG Algorithms Working Group Community
2021, Remote Sensing of Environment (257)
The 2017–2027 National Academies' Decadal Survey, Thriving on Our Changing Planet, recommended Surface Biology and Geology (SBG) as a “Designated Targeted Observable” (DO). The SBG DO is based on the need for capabilities to acquire global, high spatial resolution, visible to shortwave...
Salinity changes the dynamics of pyrethroid toxicity in terms of behavioral effects on newly hatched delta smelt larvae
Amelie Segarra, Florian Mauduit, Nermeen Amer, Felix KJ Biefel, Michelle L. Hladik, Richard E Connon, Susanne M. Brander
2021, Toxics (9)
Salinity can interact with organic compounds and modulate their toxicity. Studies have shown that the fraction of pyrethroid insecticides in the aqueous phase increases with increasing salinity, potentially increasing the risk of exposure for aquatic organisms at higher salinities. In the San Francisco Bay Delta (SFBD) estuary,...
Petrology and geochronology of 1.48 to 1.45 Ga igneous rocks in the St. Francois Mountains terrane, southeast Missouri
Edward A. du Bray, John N. Aleinikoff, Warren C. Day, Leonid A. Neymark, Seth D. Burgess
2021, Professional Paper 1866
The igneous geology of the St. Francois Mountains terrane in southeast Missouri is dominated by the products of 1.48 to 1.45 billion year old volcanic and plutonic magmatism but also includes volumetrically minor, compositionally bimodal contributions added during plutonism between 1.34 and 1.27 billion years ago. The 1.48 to 1.45...
