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Browse more than 65,000 articles authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.

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Foraging benefits promote fitness in migratory mule deer Foraging benefits promote fitness in migratory mule deer

Although migration is widespread among ungulates, the fitness benefits associated with different migratory tactics have rarely been documented. Here, we evaluated a 9-year dataset on a migratory population of mule deer to test the hypothesis that long-distance migration provides access to seasonal forage which translates into demographic benefits. Mule deer that migrated long (>130 km)...
Authors
Anna C. Ortega, Tayler N. LaSharr, Patrick W. Burke, Patrick Lionberger, Miguel Valdez, Kevin L. Monteith, Matthew J. Kauffman

New methods provide a 300–year perspective on modern area burned in two wilderness areas of the southwest United States New methods provide a 300–year perspective on modern area burned in two wilderness areas of the southwest United States

Climate change, expanding human ignitions, and increased fuels from fire exclusion are driving increases in area burned and fire severity in dry conifer forests of the western United States. Increasing area burned is occurring against the backdrop of a large fire deficit caused by over a century of fire exclusion. A key land management question is whether historically frequent fire...
Authors
Calvin A. Farris, Ellis Q. Margolis, Jose Iniguez, D.A. Falk, K. Gerow, C.H. Baisan, C.D. Allen, T.W. Swetnam

Simulated ground motion dataset in the Azores Plateau, Portugal, on rock and soil sites Simulated ground motion dataset in the Azores Plateau, Portugal, on rock and soil sites

Building on a previously developed bedrock dataset, this study extends the Azores Plateau ground motion simulations to include soil-amplified records and introduces a comprehensive validation framework. Soil amplification is modeled using one-dimensional soil profiles. A stochastic source-based approach is employed to generate the dataset, incorporating randomization of input-model...
Authors
Shaghayegh Karimzadeh, S.M. Sajad Hussaini, Daniel Caicedo, Alexandra Carvalho, Sanaz Rezaeian, Paulo B. Lourenco

Estimating paleotemperature using stable isotopes of soil-formed phyllosilicates from paleosols: A review Estimating paleotemperature using stable isotopes of soil-formed phyllosilicates from paleosols: A review

Fossilized soils, or paleosols, contain soil-formed phyllosilicates whose stable isotopic compositions may be used to calculate paleotemperature and thus reconstruct ancient terrestrial environments. Though paleosols are common in the geologic record, the use of phyllosilicates as paleotemperature proxies is limited in the literature owing to difficulties with selecting optimal paleosols
Authors
Kate Andrzejewski, Julia A. McIntosh, Erik L. Gulbranson, Daniel Ibarra

Integrating climate and anthropogenic dynamics can inform multifaceted management for declining mule deer populations Integrating climate and anthropogenic dynamics can inform multifaceted management for declining mule deer populations

Wildlife and their habitats face profound challenges from climate and landscape-scale changes that extend beyond the influence and time horizon of most biologists and land managers. In this changing environment, long-term datasets can enhance assessments of how demographic trends respond to interactions among local (e.g., habitat restoration decisions) and broad extent drivers, including...
Authors
Teagan A. Hayes, Aaron N. Johnston, L. Embere Hall, Jill E. Randall, Matthew J. Kauffman, Christopher Keefe, Kevin Monteith, Tabitha A. Graves

Long- versus short-term changes in seafloor elevation and volume of the Upper Florida Keys Reef Tract: 1935–2002 and 2002–2016 Long- versus short-term changes in seafloor elevation and volume of the Upper Florida Keys Reef Tract: 1935–2002 and 2002–2016

Coral reefs provide immense ecosystem and economic value, supporting biodiversity, fisheries, tourism, and coastal protection worth billions annually. However, widespread degradation from thermal stress, storms, disease, and human impacts has caused significant coral cover and reef structure loss, increasing coastal vulnerability and economic risks. While coral loss is well-documented...
Authors
Selena Anne-Marie Johnson, David G. Zawada, Kimberly Yates, Connor Monroe Jenkins

Drinking water arsenic, urinary arsenic biomarkers, and cognitive impairment in the REGARDS study Drinking water arsenic, urinary arsenic biomarkers, and cognitive impairment in the REGARDS study

BackgroundThere are several pathways by which inorganic arsenic (iAs) exposure can affect cognition among adults. Few epidemiologic studies evaluate iAs in water and inter-individual differences in urinary arsenic toxicokinetics. We aimed to estimate the association between individual-level urinary arsenic biomarkers, county-level iAs in drinking water, and cognitive impairment in a...
Authors
Meghan Angley, Yijia Zhang, Anne E. Nigra, Melissa A. Lombard, Matthew O. Gribble, Liping Lu, Frederick W. Unverzagt, Leslie A. McClure, Suzanne E. Judd, Mary Cushman, John Brockman, Ka Kahe

Constraining the onset of carboniferous cyclicity in the Arkoma Basin of the Midcontinent, North America: Implications for calibrating a globally significant latest Bashkirian transgression Constraining the onset of carboniferous cyclicity in the Arkoma Basin of the Midcontinent, North America: Implications for calibrating a globally significant latest Bashkirian transgression

Cyclothems are defined by the repeat juxtaposition of littoral and open marine successions over short stratigraphic distances (meters to 10's of meters) and are interpreted to be driven by glacioeustatic forcing of sea level during the late Paleozoic Ice Age. The concept of cyclothems was defined in the Midcontinent region of the United States. However, correlating the Midcontinent...
Authors
Neil Patrick Griffis, Marieke Dechesne, Tyson Michael Smith, Mark R. Hudson, Charles M. Henderson, Roland Mundil, Mikel Shinn, Justin E. Birdwell, Laura Pianowski, Brandon Michael Lutz, Cameron Mark Mercer, Leah E. Morgan, Leland R. Spangler

A regional simulation modeling framework for evaluating invasive annual grass management across the sagebrush biome A regional simulation modeling framework for evaluating invasive annual grass management across the sagebrush biome

Invasive annual grasses (IAG) continue to spread within the sagebrush biome of the western United States, degrading plant communities and wildlife habitat, decreasing forage for ranching livelihoods, and heightening wildfire risk. Effective management of IAGs requires action and long-term strategic planning across the sagebrush biome, but the cumulative effects of IAG treatments over...
Authors
Elizabeth Kari Orning, Bryan C. Tarbox, Catherine S. Jarnevich, Lindy Garner, James R. Meldrum, Cameron L. Aldridge

Carbon sequestration along a gradient of tidal marsh degradation in response to sea level rise Carbon sequestration along a gradient of tidal marsh degradation in response to sea level rise

Tidal marshes are considered one of the world's most efficient ecosystems for belowground organic carbon sequestration and hence climate mitigation. Marsh systems are however also vulnerable to degradation due to climate-induced sea level rise, whereby marsh vegetation conversion to open water often follows distinct spatial patterns: levees (i.e. marsh zones  30 m from creeks). Here, we...
Authors
Mona Huyzentruyt, Maarten Wens, Gregory S. Fivash, David Walters, Steven Bouillon, Joel Carr, Glenn Guntenspergen, Matt L. Kirwan, Stijn Temmerman

Restoration based on cost-benefit optimization: A grasslands pilot study Restoration based on cost-benefit optimization: A grasslands pilot study

Ecological restoration is essential to meeting global biodiversity conservation goals. Given limited conservation budgets, deciding where to restore habitat is a key challenge for the coming decade. We developed a spatially explicit framework to optimize ecological restoration site selection by integrating land use history, species distributions, and economic costs. The framework...
Authors
Sarah R. Weiskopf, Toni Lyn Morelli, Tina G. Mozelewski, Alexey N. Shiklomanov, Susannah B. Lerman

Effects of carbamazepine to visual function in early life stage fish Effects of carbamazepine to visual function in early life stage fish

The frequent detection of pharmaceuticals and personal care products (PPCPs) in the environment raises concern for aquatic systems. Carbamazepine (CBZ), an antiepileptic drug, is among the most detected PPCP globally, with concentrations in surface water exceeding those that induce toxicity to aquatic organisms. Non-targeted transcriptomic profiling was conducted in zebrafish (Danio...
Authors
Jason Tyler Magnuson, Holly J. Puglis, Jessica K. Leet, Adam H. Moody, Célio Freire Mariz, Thea M. Edwards, Daniela M. Pampanin
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