Staggered-entry analysis of breeding phenology and occupancy dynamics of Arizona toads from historically occupied habitats of New Mexico, USA
MJ Forzley, Mason J. Ryan, IM Latella, JT Giermakowski, Erin L. Muths, Brent H. Sigafus, Blake R. Hossack
2021, Ichthyology & Herpetology 851-859
For species with variable phenology, it is often challenging to produce reliable estimates of population dynamics or changes in occupancy. The Arizona Toad (Anaxyrus microscaphus) is a southwestern USA endemic that has been petitioned for legal protection, but status assessments are limited by a lack of information...
Hydrogeologic framework of the Big Lost River Basin, south-central Idaho, chap. A of Zinsser, L.M., ed., Characterization of water resources in the Big Lost River Basin, south-central Idaho
Lauren M. Zinsser
2021, Scientific Investigations Report 2021-5078-A
Surface-water and groundwater resources in the Big Lost River Basin of south-central Idaho are extensively interconnected; this interchange affects and is affected by water-resource management for irrigated agriculture and other uses in the basin. Concerns from water users regarding declining groundwater levels, declining streamflows, and drought helped motivate an...
Origin of unconsolidated Quaternary deposits at Harriet Point near Redoubt Volcano, Alaska
Christopher F. Waythomas
2021, Scientific Investigations Report 2021-5071
Unconsolidated boulder-rich diamicton units exposed in sea cliffs at Harriet Point southeast of Redoubt Volcano were evaluated to better understand their provenance relative to the late Quaternary eruptive history of the volcano. A previous study concluded that deposits at Harriet Point were emplaced by a large volcanic landslide originating on...
Periodic oscillation and tri-stability in mutualism systems with two consumers
Yuanshi Wang, Hong Wu, Donald L. DeAngelis
2021, Journal of Mathematical Analysis and Applications (506)
This paper considers mutualistic interactions between two consumers, in which one consumer can consume a resource only by exchange of service for service with the other. By rigorous analysis on the one-resource and two-consumer model with Holling-type I response, we show periodic oscillations and tri-stability in the mutualism system: when...
Survival and abundance of polar bears in Alaska’s Beaufort Sea, 2001–2016
Jeffrey F. Bromaghin, David C. Douglas, George M. Durner, Kristin S. Simac, Todd C. Atwood
2021, Ecology and Evolution (11) 14250-14267
The Arctic Ocean is undergoing rapid transformation toward a seasonally ice-free ecosystem. As ice-adapted apex predators, polar bears (Ursus maritimus) are challenged to cope with ongoing habitat degradation and changes in their prey base driven by food-web response to climate warming. Knowledge of polar bear response to environmental change is...
Modelling presence versus abundance for invasive species risk assessment
Catherine S. Jarnevich, Helen R. Sofaer, Peder Engelstad
2021, Diversity and Distributions (27) 2454-2464
AimInvasive species prevention and management can be guided by comparisons of invasion risk across space and among species. Species distribution models are widely used to assess invasion risk and typically estimate suitability for species presence. However, suitability for presence may not capture patterns of abundance and impact....
Evaluating streamwater dissolved organic carbon dynamics in context of variable flowpath contributions with a tracer-based mixing model
James E. Saiers, Jennifer H. Fair, James B. Shanley, J.D. Hosen, Serena Matt, Kevin A Ryan, P.A. Raymond
2021, Water Resources Research (57) 1-23
This study focuses on characterizing the contributions of key terrestrial pathways that deliver dissolved organic carbon (DOC) to streams during hydrological events and on elucidating factors governing variation in water and DOC fluxes from these pathways. We made high-frequency measurements of discharge, specific conductance (SC), and...
Helium-carbon systematics of groundwaters in the Lassen Peak Region
Peter Barry, David Bekaert, John Krantz, Saemundor Halldorsson, J. Maarten DeMoor, Tobias Fischer, Cynthia Werner, Peter J. Kelly, Alan Seltzer, Brian Franz, Justin T. Kulongoski
2021, Chemical Geology (584)
Carbon dioxide emissions from active subaerial volcanoes represent 20–50% of the annual global volcanic CO2 flux (Barry et al., 2014). Passive degassing of carbon from the flanks of volcanoes, and the associated accumulation of dissolved inorganic carbon (DIC) within nearby groundwater, also represents a potentially...
Cataloging tectonic tremor energy radiation in the Cascadia subduction zone
Aaron Wech
2021, Journal of Geophysical Research: Solid Earth (126)
For the past ∼12 years the Pacific Northwest Seismic Network has been automatically detecting and locating tectonic tremor across the Cascadia subduction zone, resulting in a catalog of more than 500,000 tremor epicenters to date, which has served as a valuable resource for tremor and slip research. This...
Red knot stopover population size and migration ecology at Delaware Bay, USA, 2021
James E. Lyons
2021, Report
Red Knots (Calidris canutus rufa) stop at Delaware Bay during northward migration to feed on eggs of horseshoe crabs (Limulus polyphemus). The northward migration of C. c. rufa coincides with the spawning of horseshoe crabs whose eggs are the perfect food for a migrating Red Knot (Karpanty et al. 2006,...
SiteOpt: An open-source R-package for site selection and portfolio optimization
Payman G Saghand, Zulqarnain Haider, Hadi Charkhgard, Mitchell J. Eaton, Julien Martin, Simeon Yurek, Bradley J. Udell
2021, Ecography (44) 1678-1685
Conservation planning involves identifying and selecting actions to best achieve objectives for managing natural, social and cultural resources. Conservation problems are often high dimensional when specified as combinatorial or portfolio problems and when multiple competing objectives are considered at varying spatial and temporal scales. Although analytical techniques such as modern...
Shallow marine ecosystem collapse and recovery during the Paleocene-Eocene Thermal Maximum
Skye Y Tian, Moriaki Yasuhara, Huai-Hsuan M Huang, Fabien L. Condamine, Marci M. Robinson
2021, Global and Planetary Change (207)
The Paleocene-Eocene Thermal Maximum (PETM), the most well-studied transient hyperthermal event in Earth history, is characterized by prominent and dynamic changes in global marine ecosystems. Understanding such biotic responses provides valuable insights into future scenarios in the face of anthropogenic warming....
Saltwater intrusion intensifies coastal permafrost thaw
Julia Guimond, Aaron Mohammad, Michelle A. Walvoord, Victor F. Bense, Barret L. Kurylyk
2021, Geophysical Research Letters (48)
Surface effects of sea-level rise (SLR) in permafrost regions are obvious where increasingly iceless seas erode and inundate coastlines. SLR also drives saltwater intrusion, but subsurface impacts on permafrost-bound coastlines are unseen and unclear due to limited field data and the absence of models that include salinity-dependent...
Establishment of baseline cytology metrics in nestling American kestrels (Falco sparverius): Immunomodulatory effects of the flame retardant isopropylated triarylphosphate isomers
Jill Jenkins, Brooke A Baudoin, Darren Johnson, Kim J. Fernie, Heather M. Stapelton, Natalie Karouna-Renier
2021, Environment International (157)
Avian populations must mount effective immune responses upon exposure to environmental stressors such as avian influenza and xenobiotics. Although multiple immune assays have been tested and applied to various avian species, antibody-mediated immune responses in non-model avian species are not commonly reported due to the lack of commercially available species-specific...
Integrating regional and local monitoring data and assessment tools to evaluate habitat conditions and inform river restoration
Francine H. Mejia, Jason M Connor, Phil R Kaufmann, Christian E. Torgersen, Eric K Berntsen, Todd Andersen
2021, Ecological Indicators
RRestoring degraded rivers requires initial assessment of the fluvial landscape to identify stressors and riverine features that can be enhanced. We associated local-scale river habitat data collected using standardized national monitoring tools with modeled regional water temperature and flow data on mid-sized northwest U.S. rivers (30–60 m wide). We grouped these rivers according...
Improving ESRI ArcGIS performance of coastal and seafloor analysis with the Python multiprocessing module
Jonathan Andrew Zieg, David G. Zawada
2021, Journal of Coastal Research (37) 1288-1293
Coastal research frequently involves the use of a GIS to analyze large areas for changes in response to major weather events, human action, and other factors. The GIS workflows used to conduct these analyses can be complex and sometimes require multiple days to complete. Long runtimes often exist even on...
Stable isotopes used to infer trophic position of green turtles (Chelonia mydas) from Dry Tortugas National Park, Gulf of Mexico, United States
David Roche, Michael Cherkiss, Brian J. Smith, Derek A. Burkholder, Kristen Hart
2021, Regional Studies in Marine Science (48)
Evaluating resource use patterns for imperiled species is critical for understanding what supports their populations. Here we established stable isotope (δ13">δ13C, δ15">δ15N) values for the endangered green sea turtle (Chelonia mydas) population found...
Development of a screening tool to examine lake and reservoir susceptibility to eutrophication in selected watersheds of the eastern and southeastern United States
W. Reed Green, Anne B. Hoos, Alan E. Wilson, Elizabeth N. Heal
2021, Scientific Investigations Report 2021-5075
This report describes a new screening tool to examine lake and reservoir susceptibility to eutrophication in selected watersheds of the eastern and southeastern United States using estimated nutrient loading and flushing rates with measures of waterbody morphometry. To that end, the report documents the compiled data and methods (R-script) used...
Integrating observations and models to determine the effect of seasonally frozen ground on hydrologic partitioning in alpine hillslopes in the Colorado Rocky Mountains, USA
David M. Rey, Eve-Lyn S. Hinckley, Michelle A. Walvoord, Kamini Singha
2021, Hydrological Processes (35)
This study integrated spatially distributed field observations and soil thermal models to constrain the impact of frozen ground on snowmelt partitioning and streamflow generation in an alpine catchment within the Niwot Ridge Long-Term Ecological Research site, Colorado, USA. The study area was comprised of...
Tradeoffs in habitat value to maximize natural resource benefits from coastal restoration in a rapidly eroding wetland: Is monitoring land area sufficient?
Tim J. B. Carruthers, Erin P. Kiskaddon, Melissa M. Baustian, Kelly M. Darnell, Leland C. Moss, Carey L. Perry, Camille Stagg
2021, Restoration Ecology (30)
Louisiana contains nearly 40% of estuarine herbaceous wetlands in the contiguous United States, supporting valuable ecosystem services and providing significant economic benefits to the state and the entire United States. However, coastal Louisiana is a hotspot for rapid land loss from factors including hurricanes, land use change, and high subsidence...
Stratigraphic and structural controls on groundwater salinity variations in the Poso Creek Oil Field, Kern County, California, USA
Michael J. Stephens, David H. Shimabukuro, Will Chang, Janice M. Gillespie, Zack Levinson
2021, Hydrogeology Journal (29) 2803-2820
Groundwater total dissolved solids (TDS) distribution was mapped with a three-dimensional (3D) model, and it was found that TDS variability is largely controlled by stratigraphy and geologic structure. General TDS patterns in the San Joaquin Valley of California (USA) are attributed to predominantly connate water composition...
Mechanistic invasive species management models and their application in conservation
Brielle K. Thompson, Alexander J. Jensen, Sarah J. Converse
2021, Conservation Science and Practice (3)
Management strategies to address the challenges associated with invasive species are critical for effective conservation. An increasing variety of mathematical models offer insight into invasive populations, and can help managers identify cost effective prevention, control, and eradication actions. Despite this, as model complexity grows, so...
The finicky nature of earthquake shaking-triggered submarine sediment slope failures and sediment gravity flows
Joan S. Gomberg, Keisuke Ariyoshi, Susan Hautala, H.P. Johnson
2021, Journal of Geophysical Research (126)
Since 2011, seafloor temperatures, pressures, and seismic ground motions have been measured by the seafloor cabled Dense Oceanfloor Network system for Earthquakes and Tsunamis (DONET) on the Nankai margin. These measurements, high-resolution bathymetry, and abundant contextual information make the DONET region seem ideally suited to provide constraints on seismic shaking-triggered...
Mechanistic invasive species management models and their application in conservation
Brielle K. Thompson, Julian D. Olden, Sarah J. Converse
2021, Conservation Science and Practice (3)
Management strategies to address the challenges associated with invasive species are critical for effective conservation. An increasing variety of mathematical models offer insight into invasive populations, and can help managers identify cost effective prevention, control, and eradication actions. Despite this, as model complexity grows, so does the inaccessibility of these...
Distinguishing between regression model fits to global mean sea level reconstructions
Yingli Zhu, Gary T. Mitchum, Kara S. Doran, Don P. Chambers, Xinfeng Liang
2021, Journal of Geophysical Research- Oceans (126)
Global mean sea level (GMSL) has been rising since the last century, posing a serious challenge for the coastal areas. A variety of regression models have been utilized for determining GMSL rise over the past one hundred years, resulting in a large spread of sea level rise...
