Patterns of denitrification potential in tidal freshwater forested wetlands
Alicia R. Korol, Gregory E. Noe
2020, Article
Limited evidence for spatial patterns of denitrification in tidal freshwater forested wetlands (TFFWs), seemingly due to high spatial variability in the process, is surprising considering the various spatial gradients of its biogeochemical and hydrogeomorphic controls in these ecosystems. Because certain physical environmental gradients may be useful for the prediction of...
Planktic foraminiferal test size and weight response to the late Pliocene environment
Chloe L. Todd, Daniela N. Schmidt, Marci M. Robinson, S. de Schepper
2020, Paleoceanography and Paleoclimatology (35)
Atmospheric carbon dioxide (pCO2atm) is impacting the ocean and marine organisms directly via changes in carbonate chemistry and indirectly via a range of changes in physical parameters most dominantly temperature. To assess potential impacts of climate change on carbonate production in the open ocean, we measured size...
Geographic and oceanographic influences on ferromanganese crust composition along a Pacific Ocean meridional transect, 14N to 14S
Kira Mizell, James R. Hein, Phoebe J. Lam, Anthony A.P. Koppers, Hubert Staudigel
2020, Geochemistry, Geophysics, Geosystems (21)
The major controls on the variability of ferromanganese (FeMn) crust composition have been generally described over the past 40 years; however, most compilation studies lack quantitative statistics and are limited to a small region of several seamounts or compare FeMn crusts from disparate areas of the global oceans. This study...
Carrying capacity of a population diffusing in a heterogeneous environment
Don DeAngelis, Bo Zhang, Wei-Ming Ni, Yuanshi Wang
2020, Mathematics and Computers in Modern Science - Acoustics and Music, Biology and Chemistry, Business and Economics (8)
The carrying capacity of the environment for a population is one of the key concepts in ecology and it is incorporated in the growth term of reaction-diffusion equations describing populations in space. Analysis of reaction-diffusion models of populations in heterogeneous space have shown that, when the maximum growth rate and...
Spatial and temporal dynamics of Pacific capelin Mallotus catervarius in the Gulf of Alaska: Implications for ecosystem-based fisheries management
David W. McGowan, Esther Goldstein, Mayumi L. Arimitsu, Alison Dreary, Olav Ormseth, Alex DeRobertis, John Horne, Lauren Rogers, Matt Wilson, Kenneth Coyle, Kris Holderied, John F. Piatt, W.T. Stockhausen, Stephani Zador
2020, Marine Ecology Progress Series (637) 117-140
Pacific capelin Mallotus catervarius are planktivorous, small pelagic fish that serve an intermediate trophic role in marine food webs. Due to the lack of a directed fishery or monitoring of capelin in the Northeast Pacific, there is limited information on their distribution and abundance, and how spatio-temporal fluctuations in capelin density affects...
Improving predictions of water supply in the Rio Grande under changing climate conditions
Ilana Renae Casarez
2020, Report
This product is a case study summarizing the original work authored by David Gutzler, Shaleene Chavarria, and Nels Bjarke. The content will be part of a collection of Case Studies shared via the Collaborative Conservation and Adaptation Strategy Toolbox (CCAST). The research featured in this case study is an analysis...
Understanding the impacts of surface-groundwater conditions on stream fishes under altered baseflow conditions
Shannon K. Brewer, G. Fox, Y. Zhou, J. Alexander
2020, Cooperator Science Series CSS-136-2020
Persistence of aquatic fauna depends on the conditions and connectivity of surface water and groundwater. In light of altered baseflows and both current and future predicted increases in stream temperatures, it is important to assess current thermal conditions, examine thermal responses of aquatic fauna, and evaluate water-management practices. Our study...
Barnyardgrass (Echinochloa crusgalli) emergence and growth in a changing climate in great plains wetlands
R. K. Owen, Elisabeth B. Webb, David A. Haukos, F. B. Fritschi, K. W. Goyne
2020, Wetlands Ecology and Management (28) 35-50
Projected twenty first century increases in temperature and precipitation intensity in the U.S. Great Plains may alter playa wetland hydroperiods. Our objective was to identify favorable germination conditions for a common moist-soil grass, Barnyardgrass (Echinochloa crusgalli L.), by evaluating emergence and growth response to various environmental conditions specific to the Northern...
Temporospatial shifts in Sandhill Crane staging in the Central Platte River Valley in response to climatic variation and habitat change
Andrew J. Caven, Emma M. Brinley Buckley, Kelsey C King, Joshua D Wiese, David M. Baasch, Greg D. Wright, Mary J. Harner, Aaron T. Pearse, Matt Rabbe, Dana Varner, Brice Krohn, Nicole Arcilla, Kirk D Schroeder, Kenneth F Dinan
2020, Monographs of the Western North American Naturalist (11) 33-76
Over 80% of the Mid-Continent Sandhill Crane (Antigone canadensis) Population (MCP), estimated at over 660,000 individuals, stops in the Central Platte River Valley (CPRV) during spring migration from mid-February through mid-April. Research suggests that the MCP may be shifting its distribution spatially and temporally within the CPRV. From 2002 to...
Event and decadal-scale modeling of barrier island restoration designs for decision support
Joseph W. Long, P. Soupy Dalyander, Michael Poff, Brian Spears, Brett Borne, David M. Thompson, Rangley C. Mickey, Steve Dartez, Gregory Gandy
2020, Shore & Beach (88) 49-57
An interdisciplinary project team was convened to develop a modeling framework that simulates the potential impacts of storms and sea level-rise to habitat availability at Breton Island, Louisiana (Breton) for existing conditions and potential future restoration designs. The model framework was iteratively developed through evaluation of model results at multiple...
A transect through Vermont's most famous volcano - Mount Ascutney
Gregory J. Walsh, Brooks P. Proctor, Karri R. Sicard, Peter M. Valley
2020, Conference Paper, 111th New England Intercollegiate Geological Conference
The Cretaceous Ascutney Mountain igneous complex affords a classic exposure of the White Mountain Igneous Suite. Often called Vermont’s most famous volcano, Mount Ascutney (elev. 3,144 feet, 958 m) stands as a prominent monadnock in the Connecticut River Valley. The mountain often serves as an inspirational landmark, as it...
Establishing high-frequency noise baselines to 100 Hz based on millions of power spectra from IRIS MUSTANG
Emily Wolin, Daniel McNamara
2020, Bulletin of the Seismological Society of America (110) 270-278
Advances in seismic instrumentation have enabled data to be recorded at increasing sample rates. This has in turn created a need to establish higher-frequency baselines for assessing data quality, as the widely-used New High (NHNM) and Low Noise Models (NLNM) of Peterson (1993) do not extend to frequencies above...
Integrating multiple data sources and multi-scale land-cover data to model the distribution of a declining amphibian
Jonathan P. Rose, Brian J. Halstead, Robert N. Fisher
2020, Biological Conservation (241)
Determining the spatial scale at which landscape features influence population persistence is an important task for conservation planning. One challenge is that sampling biases confound factors that influence species occurrence and survey effort. Recent developments in Point Process Models (PPMs) enable researchers to disentangle the sampling process from ecological drivers...
Increasing accuracy of lake nutrient predictions in thousands of lakes by leveraging water clarity data
Tyler Wagner, oa Lottig Noah R. Lottig, Meridith L. Bartley, Ephraim M. Hanks, Erin M. Schliep, Nathan B. Wikle, Katelyn B. S. King, Ian McCullough, Jemma Stachelek, Kendra S. Cheruvelil, Christopher T. Filstrup, Jean-Francois Lapierre, Boyang Liu, Patricia Sorrano, Pang-Ning Tan, Q. Wang, Katherine Webster, Jiayu Zhou
2020, Limnology and Oceanography Letters (5) 228-235
Aquatic scientists require robust, accurate information about nutrient concentrations and indicators of algal biomass in unsampled lakes in order to understand and predict the effects of global climate and land-use change. Historically, lake and landscape characteristics have been used as predictor variables in regression models to generate nutrient predictions, but...
Metal bioavailability models: Current status, lessons learned, considerations for regulatory use, and the path forward
Christopher A. Mebane, M. Jasim Chowdhury, Karel A.C. De Schamphelaere, Stephen Lofts, Paul R. Paquin, Robert C. Santore, Chris M. Wood
2020, Environmental Toxicology and Chemistry (39) 60-84
Since the early 2000s, biotic ligand models and related constructs have been a dominant paradigm for risk assessment of aqueous metals in the environment. We critically review 1) the evidence for the mechanistic approach underlying metal bioavailability models; 2) considerations for the use and refinement of bioavailability-based toxicity models; 3)...
Thresholds for post-wildfire debris flows: Insights from the Pinal Fire, Arizona, USA
Carissa A Raymond, Luke A. McGuire, Ann M. Youberg, Dennis M. Staley, Jason W. Kean
2020, Earth Surface Processes and Landforms (45) 1349-1360
Wildfire significantly alters the hydrologic properties of a burned area, leading to increases in overland flow, erosion, and the potential for runoff-generated debris flows. The initiation of debris flows in recently burned areas is well-characterized by rainfall intensity-duration (ID) thresholds. However, there is currently a paucity of data quantifying the...
Local climate determines vulnerability to camouflage mismatch in snowshoe hares
Marketa Zimova, Alexej P. K. Siren, Joshua J. Nowak, Alexander Bryan, Jacob S. Ivan, Toni Lyn Morelli, Skyler L. Suhrer, Jesse Whittington, L. Scott Mills
2020, Global Ecology and Biogeography (29) 503-515
AimPhenological mismatches, when life‐events become mistimed with optimal environmental conditions, have become increasingly common under climate change. Population‐level susceptibility to mismatches depends on how phenology and phenotypic plasticity vary across a species’ distributional range. Here, we quantify the environmental drivers of colour moult phenology, phenotypic plasticity, and...
Microbial source tracking (MST) in Chattahoochee River National Recreation Area: Seasonal and precipitation trends in MST marker concentrations, and associations with E. coli levels, pathogenic marker presence, and land use
Anna M. McKee, Marirosa Molina, Mike Cyterski, Ann Couch
2020, Water Research (171)
Escherichia coli levels in recreational waters are often used to predict when fecal-associated pathogen levels are a human health risk. The reach of the Chattahoochee River that flows through the Chattahoochee River National Recreation Area (CRNRA), located in the Atlanta-metropolitan area, is a popular recreation area that frequently exceeds the U.S....
Spatial sampling bias and model complexity in stream-based species distribution models: A case study of Paddlefish (Polyodon spathula) in the Arkansas River basin, USA
A. T. Taylor, T. Hafen, Colt Taylor Holley, A. Gonzalez, James M. Long
2020, Ecology & Evolution (10) 705-717
Leveraging existing presence records and geospatial datasets, species distribution modeling has been widely applied to informing species conservation and restoration efforts. Maxent is one of the most popular modeling algorithms, yet recent research has demonstrated Maxent models are vulnerable to prediction errors related to spatial sampling bias and model complexity....
Environmental tracer evidence for connection between shallow and bedrock aquifers and high intrinsic susceptibility to contamination of the conterminous U.S. glacial aquifer
John E. Solder, Bryant C. Jurgens, Paul E. Stackelberg, Christopher L. Shope
2020, Journal of Hydrology (583)
Covering a large portion of the northern conterminous United States (1.87 x 106 km2), the glacial aquifer serves as the primary water supply for 39 million public and domestic water users. Mean groundwater age, groundwater age distribution, and susceptibility to land surface contamination, using a new metric (Susceptibility Index; SI)...
An experimental evaluation of the feasibility of inferring concentrations of a visible tracer dye from remotely sensed data in turbid rivers
Carl J. Legleiter, Paul Manley, Susannah O. Erwin, Edward A. Bulliner
2020, Remote Sensing (12)
The movement of contaminants and biota within river channels is influenced by the flow field via various processes of dispersion. Understanding and modeling of these processes thus can facilitate applications ranging from the prediction of travel times for spills of toxic materials to the simulation of larval drift for...
A hydrologic landscapes perspective on groundwater connectivity of depressional wetlands
Brian P. Neff, Donald O. Rosenberry, Scott G. Leibowitz, David M. Mushet, Heather E. Golden, Mark C. Rains, Renee Brooks, Charles R. Lane
2020, Water (12)
Research into processes governing the hydrologic connectivity of depressional wetlands has advanced rapidly in recent years. Nevertheless, a need persists for broadly applicable, non-site-specific guidance to facilitate further research. Here, we explicitly use the hydrologic landscapes theoretical framework to develop broadly applicable conceptual knowledge of depressional-wetland hydrologic...
Post-12 Ma deformation of the lower Colorado River corridor, southwestern USA: Implications for diffuse transtension and the Bouse Formation
Jacob Thacker, Karl Karlstrom, Laura Crossey, Ryan S. Crow, Colleen Cassidy, L. Sue Beard, John Singleton, Evan Strickland, Nikki Seymour, Michael Wyatt
2020, Geosphere (16) 111-135
Structural evidence presented here documents that deformation was ongoing within the lower Colorado River corridor (southwestern USA) during and after the latest Miocene Epoch, postdating large-magnitude extension and metamorphic core complex formation. Geometric and kinematic data collected on faults in key geologic units constrain the timing of deformation in relation...
Invertebrate communities of Prairie-Pothole wetlands in the age of the aquatic Homogenocene
Kyle McLean, David M. Mushet, Jon N. Sweetman, Michael J. Anteau, Mark T. Wiltermuth
2020, Hydrobiologia (847) 3773-3793
Simplification of communities is a common consequence of anthropogenic modification. However, the prevalence and mechanisms of biotic homogenization among wetland systems require further examination. Biota of wetlands in the North American Prairie Pothole Region are adapted to high spatial and temporal variability in ponded-water duration and salinity. Recent climate change,...
Geophysical characterization of a Proterozoic REE terrane at Mountain Pass, eastern Mojave Desert, California
Kevin Denton, David A. Ponce, Jared R. Peacock, David M. Miller
2020, Geosphere (16) 456-471
Mountain Pass, California (USA), located in the eastern Mojave Desert, hosts one of the world’s richest rare earth element (REE) deposits. The REE-rich terrane occurs in a 2.5-km-wide, northwest-trending belt of Mesoproterozoic (1.4 Ga) stocks and dikes, which intrude a larger Paleoproterozoic (1.7 Ga) metamorphic block that extends ∼10 km...
