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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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Before the fire: Predicting burn severity and potential post-fire debris-flow hazards to Colorado River Cutthroat Trout (Oncorhynchus clarkii pleuriticus) conservation populations Before the fire: Predicting burn severity and potential post-fire debris-flow hazards to Colorado River Cutthroat Trout (Oncorhynchus clarkii pleuriticus) conservation populations

Background Colorado River Cutthroat Trout (CRCT; Oncorhynchus clarkii pleuriticus) conservation populations may be at risk from wildfire and post-fire debris flows hazards. Aim To predict burn severity and potential post-fire debris flow hazard classifications to CRCT conservation populations before wildfires occur. Methods We used remote sensing, spatial analyses, and machine learning...
Authors
Adam Gerhard Wells, Charles B. Yackulic, Jaime Kostelnik, Andrew R. Bock, Robert E. Zuellig, Daren M. Carlisle, James Roberts, Kevin B. Rogers, Seth M. Munson

Triggering the 2022 eruption of Mauna Loa Triggering the 2022 eruption of Mauna Loa

Distinguishing periods of intermittent unrest from the run-up to eruption is a major challenge at volcanoes around the globe. Comparing multidisciplinary monitoring data with mineral chemistry that records the physical and spatio-temporal evolution of magmas fundamentally advances our ability to forecast eruptions. The recent eruption of Mauna Loa, Earth’s largest active volcano...
Authors
Kendra J. Lynn, Drew T. Downs, Frank A. Trusdell, Penny E. Wieser, Berenise Rangel, Baylee Rose McDade, Alicia J. Hotovec-Ellis, Ninfa Lucia Bennington, Kyle R. Anderson, Dawn Catherine Sweeney Ruth, Charlotte DeVitre, Andria P. Ellis, Patricia A. Nadeau, Laura E. Clor, Peter J. Kelly, Peter Dotray, Jefferson Chang

Predicting the response of fish populations to changes in river connectivity using individual-based models Predicting the response of fish populations to changes in river connectivity using individual-based models

Barrier removal restores physical stream processes and improves accessibility of critical habitats to migratory fishes. Although increasing connectivity benefits stream systems and migratory fishes, barrier removals may also lead to increased production of undesirable or invasive migratory species, as well as myriad other concerns (e.g., reduced recreational opportunities). Few studies...
Authors
Shane Flinn, Travis Brenden, Kelly Filer Robinson

Evidence for low effective stress within the crust of the subducted Gorda plate from the 2022 December Mw 6.4 Ferndale earthquake sequence Evidence for low effective stress within the crust of the subducted Gorda plate from the 2022 December Mw 6.4 Ferndale earthquake sequence

Stress levels on and adjacent to megathrust faults at seismogenic depths remain a key but difficult to constrain parameter for assessing seismic hazard in subduction zones. Although strong ground motions have been observed to be generated from distinct, high-stress regions on the downdip end of the megathrust rupture areas in many great earthquakes, we lack direct constraints on the...
Authors
Hao Guo, James W. Atterholt, Jeffrey J. McGuire, Clifford Thurber

Vaccination of endangered wildlife as a conservation tool: Hindsights and new horizons in the pandemic era Vaccination of endangered wildlife as a conservation tool: Hindsights and new horizons in the pandemic era

Vaccines are an established conservation tool that can reduce the threat of infectious disease in endangered wildlife populations. Vaccines exist for many infectious pathogens, and at a time of rapid technological advances in vaccinology, developing vaccines and vaccination programs for free-living endangered wildlife could help efforts to prevent extinctions from disease threats...
Authors
Frances Gulland, Michelle Barbieri, Sarah Cleaveland, Martin Gilbert, Ailsa J. Hall, Tonie E. Rocke

Detection probabilities of Flathead Catfish in small Kansas impoundments Detection probabilities of Flathead Catfish in small Kansas impoundments

A primary challenge of Flathead Catfish Pylodictis olivaris management is uncertainty associated with sampling strategies and resulting ambiguity in population-level information. Assessment of impoundment and environmental conditions that affect detection probability may aid in reducing sample variance and benefit inferences regarding changes to Flathead Catfish populations. We sampled...
Authors
Brett T. Miller, Ben C. Neely, Connor J. Chance-Ossowski, Micah J. Waters, Vanessa Salazar, Lucas K. Kowalewski, Nicholas W. Kramer, Seth A. Lundgren, Jonathan J. Spurgeon

Annual grass invasions and wildfire deplete ecosystem carbon storage by >50% to resistant base levels Annual grass invasions and wildfire deplete ecosystem carbon storage by >50% to resistant base levels

Ecological disturbance can affect carbon storage and stability and is a key consideration for managing lands to preserve or increase ecosystem carbon to ameliorate the global greenhouse gas problem. Dryland soils are massive carbon reservoirs that are increasingly impacted by species invasions and altered fire regimes, including the exotic-grass-fire cycle in the extensive sagebrush...
Authors
Toby Matthew Maxwell, Harold E. Quicke, Samuel J. Price, Matthew J. Germino

Trimming the UCERF3-TD logic tree: Model order reduction for an earthquake rupture forecast considering loss exceedance Trimming the UCERF3-TD logic tree: Model order reduction for an earthquake rupture forecast considering loss exceedance

The Uniform California Earthquake Rupture Forecast version 3-Time Dependent depicts California’s seismic faults and their activity. Its logic tree has 5760 leaves. Considering 30 more model combinations related to ground motion produces 172,800 distinct models representing so-called epistemic uncertainties. To calculate risk to a portfolio of buildings, one also considers millions of...
Authors
Keith Porter, Kevin R. Milner, Edward H. Field

The underlying causes of differential migration: Assumptions, hypotheses, and predictions The underlying causes of differential migration: Assumptions, hypotheses, and predictions

Mechanisms governing the migratory decisions of birds have long fascinated ecologists and sparked considerable debate. Identifying factors responsible for variation in migration distance, also known as differential migration, has been a popular approach to understanding the mechanisms underlying migratory behaviour more generally. However, research progress has been slowed by the...
Authors
N Paprocki, Courtney J. Conway

Length in assessing status of freshwater fish populations: A review Length in assessing status of freshwater fish populations: A review

Objective Effective policy formulation regarding the conservation of freshwater fish necessitates an understanding of water‐specific prevailing conditions and trends. Assessing fish populations in inland waters is difficult and expensive because there are many independent systems that need to be evaluated. Therefore, numerous freshwater systems are beset by insufficient data and the lack...
Authors
Leandro E. Miranda, H.G. Funk, M. Palmieri, J.D. Stafford, M.E. Nichols

A decade of shaking in the Garden City: The dynamics of preparedness, perceptions, and beliefs in Canterbury, New Zealand, and implications for earthquake information A decade of shaking in the Garden City: The dynamics of preparedness, perceptions, and beliefs in Canterbury, New Zealand, and implications for earthquake information

This study explored earthquake preparedness over time - before, during, and 10 years after the Canterbury Earthquake Sequence (CES) in Aotearoa New Zealand (NZ). Surveys of Canterbury residents were conducted in 2009, 2013 and again in 2021, using variables derived from Community Engagement Theory (CET). The surveys measured earthquake perceptions and beliefs, participation and...
Authors
Julia S. Becker, Emma E. Hudson-Doyle, Lauren Vinnell, Sara K. McBride, Douglas Paton, David A. Johnston

Phytoplankton assemblage structure, drivers, and thresholds with a focus on harmful algal bloom ecology in the Lake Okeechobee system, Florida, USA Phytoplankton assemblage structure, drivers, and thresholds with a focus on harmful algal bloom ecology in the Lake Okeechobee system, Florida, USA

Untangling the complexities of harmful algal bloom (HAB) dynamics is an ongoing effort that requires a fundamental understanding of spatiotemporal phytoplankton patterns and the environmental filters through which assemblages are structured. To this aim, monthly field surveys were conducted from 2019 to 2021 at 21 sites in Lake Okeechobee, Florida – a large, shallow, eutrophic, and...
Authors
Viviana Mazzei, Kristy Lee Sullivan, Keith A. Loftin
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