Modeling estrogenic activity in streams throughout the Potomac and Chesapeake Bay watersheds
Stephanie E. Gordon, Daniel K. Jones, Vicki S. Blazer, Luke R. Iwanowicz, Brianna Williams, Kelly Smalling
2021, Environmental Monitoring and Assessment (193)
Endocrine-disrupting compounds (EDCs), specifically estrogenic endocrine-disrupting compounds, vary in concentration and composition in surface waters under the influence of different landscape sources and landcover gradients. Estrogenic activity in surface waters may lead to adverse effects in aquatic species at both individual and population levels, often observed...
Coexistence of multiple leaf nutrient resorption strategies in a single ecosystem
Chen Hao, Sasha C. Reed, Xiaotao Lü, Kongcao Xiao, Kelin Wang, Dejun Li
2021, Science of the Total Environment (772)
Leaf resorption is critical for considerations of how plants use and recycle nutrients, but fundamental unknowns remain regarding the controls over plant nutrient resorption. Empirical studies suggest at least three basic types of resorption control, including (i) stoichiometric control, (ii) nutrient limitation control, and...
Biological and chemical recovery of acidified Catskill Mountain streams in response to the Clean Air Act Amendments of 1990
Barry P. Baldigo, Scott D. George, Dylan R. Winterhalter, Michael McHale
2021, Atmospheric Environment (249)
Decades of acidic deposition have adversely affected aquatic and terrestrial ecosystems in acid-sensitive watersheds in parts of the eastern United States. The national Acid Rain Program (Title IV of the 1990 Clean Air Act Amendments - CAAA) helped reduce emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx) and resulted...
Nuclear eDNA estimates population allele frequencies and abundance in experimental mesocosms
Kara J. Andres, Suresh Sethi, David M. Lodge, Jose Andres
2021, Molecular Ecology (30) 685-697
Advances in environmental DNA (eDNA) methodologies have led to improvements in the ability to detect species and communities in aquatic environments, yet the majority of studies emphasize biological diversity at the species level by targeting variable sites within the mitochondrial genome. Here, we demonstrate that eDNA approaches also have the...
Foreward: The paleoclimatic and paleobiogeographic significance of the Tjörnes Basin, Northern Iceland
Thomas M. Cronin
2021, Book chapter, Pacific - Atlantic mollusc migration
Since the mid-19th century, geologists and paleontologists have recognized the scientific importance and unique nature of the richly fossiliferous sediments exposed along the Tjörnes Peninsula in Northern Iceland. In the following century and a half, Tjörnes has attracted the attention of an international “who’s who” in Cenozoic paleontology, as...
Home ranges and movements of two diamondback terrapins (Malaclemys terrapin macrospilota) in northwest Florida
Margaret Lamont, Darren Johnson, Daniel J. Catizone
2021, Estuaries and Coasts (44) 1484-1491
The diamondback terrapin (Malaclemys terrapin) is a small estuarine turtle distributed along the Atlantic and Gulf Coasts of the USA that is threatened by drowning in crab pots, road mortality, exploitation in the pet trade, and habitat loss. Little is known about the movement patterns and...
Beware of spatial autocorrelation when applying machine learning algorithms to borehole geophysical logs
Neil Terry, Carole D. Johnson, Frederick Day-Lewis, Beth L. Parker, Lee D. Slater
2021, Groundwater (59) 315-319
Although many of the algorithms now considered to be machine learning algorithms (MLAs) have existed for nearly a century (e.g., Rosenblatt 1958), interest in MLAs has recently increased exponentially for solving data-driven problems across a variety of fields due to the expanded availability of large, complex datasets that may be difficult...
Volcanic seismicity beneath Chuginadak Island, Alaska (Cleveland and Tana volcanoes): Implications for magma dynamics and eruption forecasting
John Power, Diana Roman, John J. Lyons, Matthew M. Haney, Daniel J. Rasmussen, Terry Plank, K. P. Nicolaysen, Pavel Izbekov, C. Werner, A Kaufman
2021, Journal of Volcanology and Geothermal Research (412)
Cleveland and Tana are remote volcanoes located in the central Aleutian volcanic arc on the eastern end of the Islands of Four Mountains (IFM). The persistently active Mount Cleveland volcano, on the western side of Chuginadak Island, is surrounded by several closely spaced Quaternary volcanic centers including Carlisle, Herbert, Kagamil, Tana, and...
Modern Mars' geomorphological activity, driven by wind, frost, and gravity
Serina Diniega, Ali M Bramson, Bonnie J. Buratti, Peter Buhler, Devon M. Burr, Matthew Chojnacki, Susan J. Conway, Colin M. Dundas, Candice J. Hansen, Alfred S. McEwen, Mathieu G.A. Lapotre, Joseph S. Levy, Lauren McKeown, Sylvain Piqueux, Ganna Portyankina, Christy Swann, Timothy N. Titus, Jacob Widmer
2021, Geomorphology (380)
Extensive evidence of landform-scale martian geomorphic changes has been acquired in the last decade, and the number and range of examples of surface activity have increased as more high-resolution imagery has been acquired. Within the present-day Mars climate, wind and frost/ice are the dominant drivers, resulting in large avalanches of...
Evaluation of a satellite-based cyanobacteria bloom detection algorithm using field-measured microcystin data
Sachidananda Mishra, Richard P. Stumpf, Blake Schaeffer, P. Jeremy Werdell, Keith A. Loftin, Andrew Meredith
2021, Science for the Total Environment (774)
Widespread occurrence of cyanobacterial harmful algal blooms (CyanoHABs) and the associated health effects from potential cyanotoxin exposure has led to a need for systematic and frequent screening and monitoring of lakes that are used as recreational and drinking water sources. Remote sensing-based methods are often used for synoptic and frequent...
Evaluating coexistence of fish species with coastal cutthroat trout in low order streams of western Oregon and Washington, USA
Kyle D Martens, Jason B. Dunham
2021, Fishes (6)
When multiple species of fish coexist there are a host of potential ways through which they may interact, yet there is often a strong focus on studies of single species without considering these interactions. For example, many studies of forestry–stream interactions in the Pacific Northwest have focused solely on the...
A new era of debris flow experiments in the Oregon woods
Maciej Krzysztof Obryk, David L. George, Benjamin B. Mirus
2021, Eos Science News
No abstract available....
Estimates of county-level nitrogen and phosphorus from fertilizer and manure from 1950 through 2017 in the conterminous United States
James A. Falcone
2021, Open-File Report 2020-1153
This report and associated dataset provide tabular county-level estimates of kilograms of nitrogen and phosphorus generated from two sources: (a) fertilizer from commercial sources and (b) livestock-based manure, for the period 1950 through 2017 for the conterminous United States. Datasets collected during this time span are for intervals of approximately...
Characterization of groundwater quality and discharge with emphasis on selenium in an irrigated agricultural drainage near Delta, Colorado, 2017–19
M. Alisa Mast
2021, Scientific Investigations Report 2020-5132
Selenium is a water-quality constituent of concern for aquatic ecosystems in the lower Gunnison River Basin. Selenium is derived from bedrock of the Mancos Shale and is mobilized and transported to groundwater and surface water by application of irrigation water. Although it is recognized that groundwater contributes an appreciable amount...
Characterizing fault roughness—Are faults rougher at long or short wavelengths?
Nicholas M. Beeler
2021, Open-File Report 2020-1134
Changes in fault roughness with scale, “scaling,” is the topic of this report; changes are considered using a general power law relation between some measure of surface height, H, and another of length, L, H=kLn, where k is a constant and n is an exponent that characterizes the scaling. Extensive...
Piloting urban ecosystem accounting for the United States
Mehdi Heris, Kenneth J. Bagstad, Charles Rhodes, Austin Troy, Ariane Middel, Kristina G. Hopkins, John Matuszak
2021, Ecosystem Services (48)
In this study, we develop urban ecosystem accounts in the U.S., using the System of Environmental-Economic Accounting Experimental Ecosystem Accounting (SEEA EEA) framework. Most ecosystem accounts focus on regional and national scales, which are appropriate for many ecosystem services. However, ecosystems provide substantial services in cities, improving quality of life...
Implications of aggregating and smoothing daily production data on estimates of the transition time between flow regimes in horizontal hydraulically fractured Bakken oil wells
T. C. Coburn, Emil D. Attanasi
2021, Mathematical Geosciences (53) 1261-1292
The level to which data are aggregated or smoothed can impact analytical and predictive modeling results. This paper discusses findings regarding such impacts on estimating change points in production flow regimes of horizontal hydraulically fractured shale oil wells producing from the middle member of the Bakken Formation. Change points that...
Ensemble species distribution model identifies survey opportunities for at-risk bearded beaksedge (Rhynchospora crinipes) in the southeastern United States
C. Ramirez-Reyes, G. Street, Francisco Vilella, T. Jones-Farrand, M. S. Wiggers, K. O. Evans
2021, Natural Areas Journal (41) 55-63
Locating additional occurrences of at-risk species can inform assessments of their status and conservation needs (including potential legal protections). The perennial bearded beaksedge (Rhynchospora crinipes) ranges from Mississippi to North Carolina, but known occurrences are limited. Because of the species' apparent rarity, a model to identify areas with suitable habitat...
American Black Bear (Ursus americanus)
Joseph D. Clark, Jon P. Beckmann, Mark S. Boyce, Bruce D Leopold, Michael R. Pelton
2021, Book chapter, Bears of the World: Ecology, Conservation and Management
American black bears (Ursus americanus) are endemic to North America, having speciated from other ursids some 1.2 to 1.8 million years ago (Kurtn & Anderson 1994). During that time, black bears came to occupy nearly all of the forested areas of the North American continent. Historically, black bears were one...
Multiple feedbacks due to biotic interactions across trophic levels can lead to persisten novel conditions that hinder restoration
Stephanie G. Yelenik, Carla M. D’Antonio, Evan M Rehm, Iain Caldwell
2021, Book chapter, Plant Invasions: The role of biotic interactions
Unlike traditional successional theory, Alternate Stable Equilibrium (ASE) theory posits that more than one community state is possible in a single environment, depending on the order that species arrive. ASE theory is often invoked in management situations where initial stressors have been removed, but native-dominated communities are not returning to...
Tectonic and magmatic controls on the metallogenesis of porphyry deposits in Alaska
Douglas C. Kreiner, James V. Jones III, Karen D. Kelley, Garth E. Graham
2021, Book chapter, Porphyry deposits of the northwestern Cordillera of North America: A 25-year update
Porphyry Cu and Mo deposits and occurrences are found throughout Alaska; they formed episodically during repeated subduction and arc-continent collisions spanning the Silurian to Quaternary. Porphyry systems occur in continental-margin and island arcs, which are broadly grouped into pre-accretionary or post-accretionary arcs. Pre-Mesozoic occurrences formed in continental or island arcs...
Quarterly wildlife mortality report January 2021
Bryan J. Richards, Barbara Bodenstein, Daniel A. Grear, Hon S. Ip, Anne Ballmann, Julia S. Lankton, Valerie I. Shearn-Bochsler
2021, Newsletter
The USGS National Wildlife Health Center (NWHC) Quarterly Mortality Report provides brief summaries of epizootic mortality and morbidity events by quarter. The write-ups, highlighting epizootic events and other wildlife disease topics of interest, are published in the Wildlife Disease Association quarterly newsletter. A link is provided in this WDA newsletter...
Non-native Asian swamp eel, Monopterus albus/javanensis (Zuiew, 1973/Lacepede, 1800), responses to low temperatures
Ryan K. Saylor, Pam Schofield, Wayne A Bennett
2021, Fish Physiology and Biochemistry (47) 465-476
Asian swamp eel, Monopterus albus/javanensis [Zuiew, 1973/Lacepede 1800], has been established in the southeastern USA since at least 1994, yet little is known about its ability to survive low winter temperatures. We use standard thermal methodologies to quantify low temperature responses and provide a detailed description of swamp...
Reconstructing population dynamics of a threatened marine mammal using multiple data sets
J. Hostetler, Julien Martin, M. Kosempa, H. Edwards, K. Rood, S. Barton, Michael C. Runge
2021, Scientific Reports (11)
Models of marine mammal population dynamics have been used extensively to predict abundance. A less common application of these models is to reconstruct historical population dynamics, filling in gaps in observation data by integrating information from multiple sources. We developed an integrated population model for the...
Knowledge inventory of foundational data products in planetary science
Jason Laura, Ross A. Beyer
2021, The Planetary Science Journal (2)
Some of the key components of any Planetary Spatial Data Infrastructure (PDSI) are the data products that end-users wish to discover, access, and interrogate. One precursor to the implementation of a PSDI is a knowledge inventory that catalogs what products are available, from which data producers, and...
