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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
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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Re-examining the growing degree day minimum for grass carp spawning initiation in Lake Erie: Have we missed the mark? Re-examining the growing degree day minimum for grass carp spawning initiation in Lake Erie: Have we missed the mark?
Understanding the timing of life history processes of invasive fish species, such as adult aggregations during spawning, allows natural resource managers to optimize targeted population control efforts. Temperature-based estimates of the timing of spawning initiation for grass carp (Ctenopharyngodon idella) exist from its native range, but have not previously been developed for grass...
Authors
Eric R. Smyth, Corbin David Hilling, Robert D. Hunter, P. Ryan Jackson, Patrick Kocovsky, James J. Roberts, D. Andrew R. Drake
Repeated coral bleaching events have eroded reef accretion potential in the Florida Keys Repeated coral bleaching events have eroded reef accretion potential in the Florida Keys
Coral bleaching is now the primary driver of coral-reef degradation globally, threatening the persistence of coral-reef functions and the invaluable ecosystem services they support. The Florida Keys have been impacted by four severe, regional-scale coral-bleaching events, which occurred in 1997–1998, 2005, 2014–2015, and 2023. Our aim in this study was to quantify the effects of those...
Authors
Lauren T. Toth, Travis A Courtney
Identifying overlap between native fish movements and a possible seasonal Grass Carp deterrent in the Sandusky River, Ohio, USA Identifying overlap between native fish movements and a possible seasonal Grass Carp deterrent in the Sandusky River, Ohio, USA
Riverine fishes are vulnerable to habitat fragmentation caused by interrupted access to vital habitats. Fragmentation using artificial structures can be used to limit the spread of invasive fishes by inhibiting movement between critical habitats. Thus, tradeoffs exist between maintaining connectivity for native species and restricting movement of invasive fishes. A nonphysical deterrent...
Authors
Evelyn P. Pantelopoulos, James J. Roberts, Matthew Ross Acre, John M. Dettmers, Matthew D. Faust, Corbin David Hilling, Song S. Qian, Christine M. Mayer
Microplastics undergo fragmentation during pressurized membrane filtration Microplastics undergo fragmentation during pressurized membrane filtration
Low-micrometer microplastics (
Authors
Zhijie Wang, Ziyan Wu, Sarah E. Janssen, Gregory W. Harrington, Haoran Wei, Mohan Qin
CRESCENT earthquake dynamic rupture, earthquake cycle, and tsunami code verification platform CRESCENT earthquake dynamic rupture, earthquake cycle, and tsunami code verification platform
Physics-based simulations are critical for understanding natural hazards. The increasing complexity of numerical codes requires benchmark exercises to verify that different computational methods yield consistent results when solving the same governing equations. Here, we present an open-access web platform designed for the verification of earthquake dynamic rupture, seismic cycle, and...
Authors
Loic Bachelot, Fabian Kutschera, Michael Barall, Brittany Erickson, Eric Dunham, Alice-Agnes Gabriel, Ruth A. Harris, Shuo Ma, Amanda M. Thomas, Wenqiang Zhang
Estimating the importance of floating surface material to the total phosphorus transport in Silver Creek, Wisconsin using Particle Image Velocimetry Estimating the importance of floating surface material to the total phosphorus transport in Silver Creek, Wisconsin using Particle Image Velocimetry
Various techniques are used to estimate nutrient delivery in streams that combine flow and water-quality data. However, the transport of surface floating material is difficult to measure, and is therefore typically neglected when stream sampling and in the estimated nutrient delivery. Here, we describe an approach to estimate the amount of material (duckweed (Lemna genus), filamentous...
Authors
Dale M. Robertson, Paul Reneau, Keegan E Johnson, Matthew W. Diebel, Benjamin J. Siebers, Bridget B. Kaemming
Successes and opportunities for solutions-oriented conservation research: Lessons learned from avian science Successes and opportunities for solutions-oriented conservation research: Lessons learned from avian science
Conservation science struggles with an ongoing divide between research and action. Given its history of broad public engagement and multi-scale management coordination, avian conservation typifies many of the challenges, successes, and opportunities across the broader field of conservation and is rich with examples that may guide solutions-oriented conservation science. In semi...
Authors
Rachel T. Buxton, Miguel F. Jimenez, Aalia I. Khan, Tori D. Bakley, Lisha L. Berzins, Barbara Frei, Elizabeth A. Gow, Autumn-Lynn Harrison, Osvel Hinojosa-Huerta, Andrea R. Norris, Brendon Samuels, Douglas C. Tozer, Eric M. Wood, Theodore J. Zenzal, Paul A. Smith, Catherine Jardine, Mark S. Woodrey, Bradley P. Wilkinson, Angeles Raymundo, Bryan B. Lenz
Corundum discovered by SuperCam and the Perseverance rover at Jezero crater, Mars Corundum discovered by SuperCam and the Perseverance rover at Jezero crater, Mars
Mars is primarily composed of mafic mineral assemblages and their alteration products, but small, scattered rocks strewn across the landscape offer clues to greater petrological diversity. While traversing the Jezero crater rim, the Perseverance rover encountered several plagioclase-rich light-toned float rocks. SuperCam identified the distinctive signature of corundum (α-Al2O3) in these...
Authors
A.M. Ollila, O. Beyssac, A. Fau, O. Forni, E. Clave, P.S.A. Beck, C. C. Bedford, V. Payre, E. Dehouck, S.A. Connell, J.A. Manrique, P. Pilleri, O. Gasnault, G.M. Martinez, A. Udry, S. Bernard, P. Gasda, T. Acosta-Maeda, R.B. Anderson, Travis S.J. Gabriel, F. Calef, J.F. Bell, J. N. Maki, S. Schroder, C. Quantin-Nataf, J.R. Johnson, B. Chide, K. Rammelkamp, F. Poulet, C. Royer, M. Rock, N.L. Lanza, S.K. Sharma, G. Lopez-Ryeys, T. Fouchet, J. Comellas, A. Zastrow, E. Coutis, R.C. Wiens, A. Cousin, S. Maurice, S. M. Clegg, P. Bernardi, T. Nelson
Digitizer Suite: The Albuquerque Seismological Laboratory Digitizer Testing Suite Digitizer Suite: The Albuquerque Seismological Laboratory Digitizer Testing Suite
Laboratory testing of digitizers and seismometers helps ensure that prior to deployment the instrumentation can produce high quality data and is operating within specifications. In this work we detail the software package called: the Albuquerque Seismological Laboratory (ASL) Digitizer Test Suite. This Java software package provides several algorithms to verify various performance...
Authors
Patrick Bastien, Corey I. Beutel, Andrew Holcomb, James Holland, Aaron Kearns, Edward Kromer, Mairi Maclean Litherland, Ian Dru Podmore, Adam T. Ringler
Recycling radiogenic osmium by crustal foundering in subduction zones: Evidence from pyroxenite xenoliths in the north Andean arc Recycling radiogenic osmium by crustal foundering in subduction zones: Evidence from pyroxenite xenoliths in the north Andean arc
Removal of mafic-ultramafic lower crust (e.g., via delamination) is fundamental to making andesitic continental crust, yet direct evidence of this process remains elusive. A unique suite of garnet clinopyroxenite and hornblendite (arclogite) xenoliths from the northern volcanic zone of the Andes, erupted to the surface in the mid-Pleistocene, have bulk-rock geochemistry and osmium (Os)...
Authors
Lisa J. Zieman, Alan D. Rooney, Natalia Pardo, Elias Bloch, Kouki Kitajima, John W. Valley, Mauricio Ibañez-Mejia
Navigating uncertainty and competing objectives: Spring chinook salmon recovery in the upper Willamette river Navigating uncertainty and competing objectives: Spring chinook salmon recovery in the upper Willamette river
Globally, anadromous fish populations are threatened with extinction due to multiple factors, including river impoundments that block migration, widespread alteration of physical habitat, temperature, and flow regimes, commercial and recreational harvest, changes in biological communities, and long-term climate trends. In this synthesis, we describe how physical and biological factors...
Authors
Claire E. Couch, J. Rose Wallick, James T. Peterson, Bailey August Morgan, Matthew L. Keefer, Christopher C. Caudill, Kathleen G. O’Malley, Christina Amy Murphy, James S. White, Jake R. Kelley, Dalton J. Hance, Gabriel S. Hansen, Tobias J. Kock
An alternative approach to studying humpback whale song changes over time using occupancy models An alternative approach to studying humpback whale song changes over time using occupancy models
Humpback whales produce complex, structured songs that vary among individuals, populations, and through time. This study presents a novel method of studying changes in humpback whale song elements through time while accounting for detection probability.
Authors
Franny Oppenheimer, Therese M. Donovan, James E. Hines, Kristin Rasmussen, Laura J. May-Collado