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Influence of a guide net on the presence and behavior of fish near the selective water withdrawal structure in Lake Billy Chinook, Oregon, 2022
Imaging sonar was used to assess the influence of a fish guidance net, installed at the entrances to the selective water withdrawal (SWW) intake structure, in the forebay of Round Butte Dam, Oregon, on behavior, abundance, and timing of fish during the spring of 2022. The purposes of the SWW are (1) to direct surface currents in the forebay to attract and collect downriver migrating juvenile salmo
Authors
Collin D. Smith, Tyson W. Hatton
Rapid population decline in McKay's Bunting, an Alaskan endemic, highlights the species’ current status relative to international standards for vulnerable species
The McKay’s Bunting (Plectrophenax hyperboreus) is endemic to Alaska, breeds solely on the remote and uninhabited St. Matthew and Hall islands (332 km2) in the central Bering Sea, and is designated as a species of high conservation concern due to its small population size and restricted range. A previous hypothesized population estimate (~2,800—6,000 individuals) was greatly increased (~31,200 ind
Authors
Rachel M. Richardson, Courtney L. Amundson, James A. Johnson, Marc D. Romano, Audrey R. Taylor, Michael D. Fleming, Steven M. Matsuoka
The 2022 Chaos Canyon landslide in Colorado: Insights revealed by seismic analysis, field investigations, and remote sensing
An unusual, high-alpine, rapid debris slide originating in ice-rich debris occurred on June 28, 2022, at 16:33:16 MDT at the head of Chaos Canyon, a formerly glacier-covered valley in Rocky Mountain National Park, CO, USA. In this study, we integrate eyewitness videos and seismic records of the event with meteorological data, field observations, pre- and post-event satellite imagery, and uncrewed
Authors
Kate E. Allstadt, Jeffrey A. Coe, Elaine Collins, Francis K. Rengers, Anne Mangeney, Scott M. Esser, Jana Pursley, William L. Yeck, John Bellini, Lance R. Brady
Non-native Rhizophora mangle as sinks for coastal contamination on Moloka'i, Hawai'i
Coastal mangrove forests provide a suite of environmental services, including sequestration of anthropogenic contamination. Yet, research lags on the environmental fate and potential human health risks of mangrove-sequestered contaminants in the context of mangrove removal for development and range shifts due to climate change. To address this, we conducted a study on Moloka'i, Hawai'i, comparing
Authors
Geoffrey Szafranski, Elise F. Granek, Michelle Hladik, Mia Hackett
Examining the complex relations between climate and streamflow in the mid-atlantic region of the United States
We explored the complex relations between climate and streamflow in the Mid-Atlantic region of the United States. In 124 watersheds across this region, we quantified spatial and temporal variation in air temperature (AT), precipitation (P), and streamflow (Q) from 1981 through 2020. Upward directional trends in monthly values of AT, P, and Q indicated an increase of 0.27–1.9 degrees Celsius, 0.12–
Authors
Karen C. Rice, Chris A. Mason, Aaron L. Mills
Using a coupled integral projection model to investigate interspecific competition during an invasion: An application to silver carp (Hypophthalmichthys molitrix) and gizzard shad (Dorosoma cepedianum)
As a generalization of stage-based matrix models, integral projection models (IPMs) have been used to describe the size-based dynamics of wildlife and fisheries populations. Although some matrix models have explicitly included species interactions, few IPMs have expanded beyond single species, which limits their ability to describe the competitive dynamics of co-occuring taxa. We present a coupled
Authors
James P Peirce, Gregory Sandland, David Schumann, Hannah Mann Thompson, Richard A. Erickson
Applying intrinsic potential models to evaluate salmon (Oncorhynchus spp.) introduction into main-stem and tributary habitats upstream from the Skagit River Hydroelectric Project, northern Washington
We assessed habitat suitability for salmonids across selected tributaries upstream from three hydroelectric dams on the upper Skagit River in Whatcom County, northern Washington. We used NetMap, a commercial toolset within the ArcMap geographic information system (GIS), to analyze stream attributes based upon a synthetic stream channel network derived from digital elevation models. The GIS-derived
Authors
Jeffrey J. Duda, Jill M. Hardiman
Forage senescence and disease influence elk pregnancy across the Greater Yellowstone Ecosystem
For various temperate ungulate species, recent research has highlighted the potential for spring vegetation phenology (“green-up”) to influence individual condition, with purported benefits to population productivity. However, few studies have been able to measure the benefit on vital rates directly, and fewer still have investigated the comparative influence of other phenological periods on ungul
Authors
Owen R. Bidder, Thomas Connor, Juan M. Morales, Gregory J.M. Rickbeil, Jerod A. Merkle, Rebecca K. Fuda, Jared D. Rogerson, Brandon M. Scurlock, William H Edwards, Eric K. Cole, Douglas E. McWhirter, Alyson B. Courtemanch, Sarah Dewey, Matthew Kauffman, Daniel R. MacNulty, Johan T. du Toit, Daniel R. Stahler, Arthur D. Middleton
Bayesian hierarchical modeling for probabilistic estimation of tsunami amplitude from far-field earthquake sources
Evaluation of tsunami disaster risk for a coastal region requires reliable estimation of tsunami hazard, for example, wave amplitude close to the shore. Observed tsunami data are scarce and have poor spatial coverage, and for this reason probabilistic tsunami hazard analysis (PTHA) traditionally relies on numerical simulation of “synthetic” tsunami generation and propagation toward the coast. Such
Authors
Georgios Boumis, Eric L. Geist, Danhyang Lee
Exploring the uncertainty of machine learning models and geostatistical mapping of rare earth element potential in Indiana coals, USA
Rare earth elements and yttrium (REEs) have a wide range of applications in high- and low-carbon technologies. The strategic significance of REEs has grown due to their expanding applications in manufacturing industries and the constrained availability of these essential resources. This research explores the applicability of machine learning models and their uncertainty for assessing the REE poten
Authors
Snehamoy Chatterjee, C. Özgen Karacan, Maria Mastalerz
Backpack satellite transmitters reduce survival but not nesting propensity or success of greater sage-grouse
Telemetry technology is ubiquitous for studying the behavior and demography of wildlife, including the use of traditional very high frequency (VHF) radio telemetry and more recent methods that record animal locations using global positioning systems (GPS). Satellite-based GPS telemetry allows researchers to collect high spatial–temporal resolution data remotely but may also come with additional co
Authors
Bryan S. Stevens, Courtney J. Conway, Cody A. Tisdale, Kylie N. Denny, Andrew Meyers, Paul Makela
Tagger effects in aquatic telemetry: Short-term and delayed impacts of surgery in Atlantic salmon smolts
ObjectiveAn assumption of biotelemetry is that animal performance is unaffected by the tagging process and tag burden, yet this assumption is often untested or not thoroughly explored. Our objective was to explore how transmitter implantation procedures influenced Atlantic Salmon Salmo salar smolt survival and migratory performance.MethodsWe monitored radio-tagged smolts, first in the hatchery and
Authors
Kurt C. Heim, Jonah L. Withers, Theodore Castro-Santos