The role of phosphorus and nitrogen on chlorophyll a: Evidence from hundreds of lakes
Zhongyao Liang, Patricia A. Soranno, Tyler Wagner
2020, Water Research (185)
The effect of nutrients on phytoplankton biomass in lakes continues to be a subject of debate by aquatic scientists. However, determining whether or not chlorophyll a (CHL) is limited by phosphorus (P) and/or nitrogen (N) is rarely considered using a probabilistic method in studies of hundreds of lakes across broad spatial extents....
Integrating perspectives to understand lake ice dynamics in a changing world
Sapna Sharma, Michael F. Meyer, Joshua Culpepper, Xiao Yang, Stephanie Hampton, Stella A. Berger, Matthew R. Brousil, Steven C. Fradkin, Scott N. Higgins, Kathi Jo Jankowski, Georgiy Kirillin, Adrianne P Smits, Emily C. Whitaker, Foad Yousef, Shuai Zhang
2020, Journal of Geophysical Research: Biogeosciences (125)
Ice cover plays a critical role in physical, biogeochemical, and ecological processes in lakes. Despite its importance, winter limnology remains relatively understudied. Here, we provide a primer on the predominant drivers of freshwater lake ice cover and the current methodologies used to study lake ice, including in...
Importance of accurately quantifying internal loading in developing phosphorus reduction strategies for a chain of shallow lakes
Dale M. Robertson, Matthew W. Diebel
2020, Lake and Reservoir Management (36) 391-411
The Winnebago Pool is a chain of 4 shallow lakes in Wisconsin. Because of high external phosphorus (P) inputs to the lakes, the lakes became highly eutrophic, with much P contained in their sediments. In developing a total maximum daily load (TMDL) for these lakes, it is...
Comparison of storm runoff models for a small watershed in an urban metropolitan area, Albuquerque, New Mexico
Zachary M. Shephard, Kyle R. Douglas-Mankin
2020, Scientific Investigations Report 2020-5058
In order to comply with a current U.S. Environmental Protection Agency watershed-based National Pollutant Discharge Elimination System permit, the City of Albuquerque required a better understanding of the rainfall-runoff processes in its small urban watersheds. That requirement prompted the initiation of the assessment of three existing watershed models that were...
Monitoring and real-time modeling of Escherichia coli bacteria for the Chattahoochee River, Chattahoochee River National Recreation Area, Georgia, 2000–2019
Brent T. Aulenbach, Anna M. McKee
2020, Open-File Report 2020-1048
The Chattahoochee River National Recreation Area (CRNRA) is a National Park Service unit/park with 48 miles of urban waterway in the Atlanta metropolitan area. The Chattahoochee River within the CRNRA is a popular place for water-based recreation but is known to periodically experience elevated levels of fecal-coliform bacteria associated with...
Linking land and sea through an ecological-economic model of coral reef recreation
Kirsten L. L. Oleson, Kenneth J. Bagstad, Carlo Fezzi, Megan Barnes, Mary Donovan, Kim A. Falinski, Kelvin Gorospe, Hla Htun, Joey Lecky, Ferdinando Villa, Tamara Wong
2020, Ecological Economics (177)
Coastal zones are popular recreational areas that substantially contribute to social welfare. Managers can use information about specific environmental features that people value, and how these might change under different management scenarios, to spatially target actions to areas of high current or potential value. We explored how snorkelers’ experience would...
Application of empirical land-cover changes to construct climate change scenarios in federally managed lands
Christopher E. Soulard, Matthew B. Rigge
2020, Remote Sensing (12)
Sagebrush-dominant ecosystems in the western United States are highly vulnerable to climatic variability. To understand how these ecosystems will respond under potential future conditions, we correlated changes in National Land Cover Dataset “Back-in-Time” fractional cover maps from 1985-2018 with Daymet climate data in three federally managed preserves in the sagebrush...
The importance of explicitly modelling sea-swell waves for runup on reef-lined coasts
Ellen Quataert, Curt D. Storlazzi, Ap van Dongeren, Robert T. McCall
2020, Coastal Engineering (160)
The importance of explicitly modelling sea-swell waves for runup was examined using a 2D XBeach short wave-averaged (surfbeat, “XB-SB”) and a wave-resolving (non-hydrostatic, “XB-NH”) model of Roi-Namur Island on Kwajalein Atoll in the Republic of Marshall Islands. Field observations on water levels, wave heights, and wave runup were used to...
Influence of soil microbiota on Taxodium distichum seedling performance during extreme flooding events
Lorena Torres-Martinez, Mareli Sanchez-Julia, Elizabeth Kimbrough, Trey Hendrix, Miranda Hendrix, Richard H. Day, Ken W. Krauss, Sunshine A Van Bael
2020, Plant Ecology (221) 773-793
Plant associations with soil microbiota can modulate tree seedling growth and survival via mutualistic or antagonistic interactions. It is uncertain, however, whether soil microbiota influence seedling growth of coastal trees when exposed to extreme flooding regimes. We evaluated the role of soil microbes in promoting baldcypress (Taxodium distichum) seedling performance...
The utility of zooarchaeological data to guide listing efforts for an imperiled mussel species (Bivalvia: Unionidae: Pleurobema riddellii)
Charles R. Randklev, Steve Wolverton, Nathan A. Johnson, Chase H. Smith, Traci DuBose, Clint Robertson, Julian Conley
2020, Conservation Science and Practice (2)
The status of species in freshwater systems shift over time due to natural and anthropogenic causes. Determining the magnitude and cause of these shifts requires a long-term perspective. This process is complicated when there are also questions about the taxonomic validity of a species. Addressing these issues is important because...
The chemostratigraphy of the Murray formation and role of diagenesis at Vera Rubin ridge in Gale crater, Mars, as observed by the ChemCam instrument
Jens Frydenvang, Nicholas Mangold, Roger C. Wiens, Abigail A. Fraeman, Lauren A. Edgar, Christopher M. Fedo, Jonas L’Haridon, Candice C. Bedford, Sanjeev Gupta, John P. Grotzinger, Jon C. Bridges, Ben C. Clark, Elizabeth B. Rampe, Olivier Gasnaut, Sylvestre Maurice, Patrick J. Gasda, Nina L. Lanza, Ann M. Olilla, Pierre-Yves Meslin, Valerie Payre, Fred J. Calef, Mark R Salvatore, Christopher H House
2020, Journal of Geophysical Research: Planets (125)
Geochemical results are presented from Curiosity’s exploration of the Vera Rubin ridge (VRR), in addition to the full chemostratigraphy of the predominantly lacustrine mudstone Murray formation up to and including VRR. VRR is a prominent ridge flanking Aeolis Mons (informally Mt. Sharp), the central mound in Gale crater, Mars, and...
Discharge and dissolved-solids characteristics and trends of Snake River above Jackson Lake at Flagg Ranch, Wyoming, 1986–2018
Olivia L. Miller, Cheryl A. Eddy-Miller
2020, Scientific Investigations Report 2020-5062
The headwaters of the Snake River are in the mountains of northwestern Wyoming. Maintaining the recognized high quality of water in Grand Teton National Park is a National Park Service (NPS) priority. To characterize and understand the water resources of Grand Teton National Park, the NPS established a monitoring program...
Pseudo-prospective evaluation of UCERF3-ETAS forecasts during the 2019 Ridgecrest sequence
William J. Savran, Maximillian J. Werner, W. Marzocchi, David A. Rhoades, David D. Jackson, Kevin R. Milner, Edward H. Field, Andrew J. Michael
2020, Bulletin of the Seismological Society of America (110) 1799-1817
The 2019 Ridgecrest sequence provides the first opportunity to evaluate Uniform California Earthquake Rupture Forecast v.3 with epidemic‐type aftershock sequences (UCERF3‐ETAS) in a pseudoprospective sense. For comparison, we include a version of the model without explicit faults more closely mimicking traditional ETAS models (UCERF3‐NoFaults). We evaluate the forecasts with new...
Evidence of previous faulting along the 2019 Ridgecrest, California earthquake ruptures
Jessica Thompson Jobe, Belle E. Philibosian, Colin Chupik, Timothy E. Dawson, Scott E.K. Bennett, Ryan D. Gold, Christopher DuRoss, Tyler C. Ladinsky, Katherine J. Kendrick, Elizabeth Haddon, Ian Pierce, Brian J. Swanson, Gordon G. Seitz
2020, Bulletin of the Seismological Society of America (110) 1427-1456
The July 2019 Ridgecrest earthquake sequence in southeastern California was characterized as surprising because only ~35% of the rupture occurred on previously mapped faults. Employing more detailed inspection of pre-event high-resolution topography and imagery in combination with field observations, we document evidence of active faulting in the landscape along the...
San Andreas fault exploration using refraction tomography and S-wave-type and Fϕ-mode guided waves
Rufus D. Catchings, Michael Rymer, Mark Goldman
2020, Bulletin of the Seismological Society of America (110) 3088-3102
Surface ruptures from the 18 April 1906 M∼7.9 San Francisco earthquake were distributed over an ∼35‐meter‐wide zone at San Andreas Lake on the San Francisco Peninsula in California (Schussler, 1906). Since ∼1906, the surface ruptures have been largely covered by water, but with water...
Conservative plumage masks extraordinary phylogenetic diversity in the Grallaria rufula (Rufous Antpitta) complex of the humid Andes
Terry Chesser, Morton L Isler, Andres M Cuervo, C Daniel Cadena, Spencer C Galen, Laura M. Bergner, Robert C. Fleischer, Gustavo A Bravo, Daniel F Lane, Peter A. Hosner
2020, Auk (137)
The Grallaria rufula complex is currently considered to consist of 2 species, G. rufula (Rufous Antpitta) and G. blakei (Chestnut Antpitta). However, it has been suggested that the complex, populations of which occur in humid montane forests from Venezuela to Bolivia, comprises a suite of vocally distinct yet morphologically cryptic...
Groundwater age and susceptibility of south Atlantic and Gulf Coast principal aquifers of the contiguous United States
John E. Solder
2020, Scientific Investigations Report 2020-5050
Groundwater susceptibility to contamination was investigated by using environmental tracer-based groundwater age metrics in the south Atlantic and Gulf Coast principal aquifer systems of the Southeastern Coastal Plain, Mississippi embayment–Texas coastal uplands, and the Coastal Lowlands. Samples of dissolved gas, tritium, sulfur hexafluoride, tritiogenic helium, and carbon-14 were collected from...
Decision analysis for greater insights into the development and evaluation of Chinook salmon restoration strategies in California’s Central Valley
James T. Peterson, Adam Duarte
2020, Restoration Ecology (28) 1596-1609
Considerable amounts of resources have been invested in ecological restoration projects across the globe to restore ecosystem integrity. Restoration strategies are often diverse and have been met with mixed success. In this paper, we describe the Chinook salmon (Oncorhynchus tshawytscha) decision-support models developed by the Central Valley Project Improvement Act...
Anticipating future learning affects current control decisions: A comparison between passive and active adaptive management in an epidemiological setting
Benjamin D Atkins, Chris P. Jewell, Michael C. Runge, Matthew J. Ferrari, Katriona Shea, William J. M. Probert, Michael J. Tildesley
2020, Journal of Theoretical Biology (506)
Infectious disease epidemics present a difficult task for policymakers, requiring the implementation of control strategies under significant time constraints and uncertainty. Mathematical models can be used to predict the outcome of control interventions, providing useful information to policymakers in the event...
Biological nitrogen fixation across major biomes in Latin America: Patterns and global change effects
Carla R. G. Reis, Felipe S. Pacheco, Sasha C. Reed, Graciela Tejada, Gabriela B. Nardoto, Maria C. Forti, Jean Ometto
2020, Science of the Total Environment (746)
Biological nitrogen fixation (BNF) supports terrestrial primary productivity and plays key roles in mediating human-induced changes in global nitrogen (N) and carbon cycling. However, there are still critical uncertainties in our understanding of the amount of BNF occurring across terrestrial ecosystems, and of how terrestrial BNF will respond to global...
Mapping croplands of Europe, Middle East, Russia, and Central Asia using Landsat 30-m data, machine learning algorithms and Google Earth Engine
Aparna Phalke, Mutlu Ozdogan, Prasad Thenkabail, Tyler Erickson, Noel Gorelick
2020, ISPRS Journal of Photogrammetry and Remote Sensing (167) 104-122
Accurate and timely information on croplands is important for environmental, food security, and policy studies. Spatially explicit cropland datasets are also required to derive information on crop type, crop yield, cropping intensity, as well as irrigated areas. Large area defined as continental to global cropland mapping is challenging...
Remotely sensed thermal decay rate: An index for vegetation monitoring
Sanath S. Kumar, Lara Prihodko, Brianna M. Lind, Julius Anchang, Wenjie Ji, Christopher Wade Ross, Milkah Njoki Kahiu, Naga Manohar Velpuri, P. Niall Hanan
2020, Nature (10)
Vegetation buffers local diurnal land surface temperatures, however, this effect has found limited applications for remote vegetation characterization. In this work, we parameterize diurnal temperature variations as the thermal decay rate derived by using satellite daytime and nighttime land surface temperatures and modeled using Newton’s law of cooling. The relationship between...
GIS-Modeling of island hopping through the Philippines demonstrates trade-offs migrant grey-faced buzzards during oceanic crossings
Camille B. Concepcion, Keith L. Bildstein, Todd E. Katzner
2020, Journal of Engineering, Environment and Agriculture Research (2) 11-28
Migration can be costly with consequences that can influence population trajectories. These costs and consequences are especially heightened during over-water travels, which can be high-risk events for birds. We created spatial models to evaluate potential migratory responses of “oceanic”, island-hopping grey-faced buzzards that encounter variation in landscape parameters and weather...
Observations of an extreme atmospheric river storm with a diverse sensor network
Benjamin J. Hatchett, Q. Cao, Phillip B. Dawson, C. J. Ellis, C. W. Hecht, B. Kawzenuk, J. T. Lancaster, T. C. Osborne, A. M. Wilson, M. L. Anderson, M. D. Dettinger, J. F. Kalansky, M. L. Kaplan, D. P. Lettenmaier, N. S. Oakley, R. M. Ralph, D. W. Reynolds, A. B. White, M. Sierks, E. Sumargo
2020, Earth and Space Science (7)
Observational networks enhance real‐time situational awareness for emergency and water resource management during extreme weather events. We present examples of how a diverse, multitiered observational network in California provided insights into hydrometeorological processes and impacts during a 3‐day atmospheric river storm centered on 14 February 2019. This network, which has...
Caldera collapse geometry revealed by near‐field GPS displacements at Kilauea Volcano in 2018
Paul Segall, Kyle R. Anderson, Fabio Pulvirenti, Taiyi Wang, Ingrid A. Johanson
2020, Geophysical Research Letters (47)
We employ near‐field GPS data to determine the subsurface geometry of a collapsing caldera during the 2018 Kīlauea eruption. Collapse occurred in 62 discrete events, with “inflationary” deformation external to the collapse, similar to previous basaltic collapses. We take advantage of GPS data from the collapsing block and independent constraints...
