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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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Hydrothermal manganese-oxide mineralization of a carbonate ooze, Samoan hotspot region, South Pacific Ocean Hydrothermal manganese-oxide mineralization of a carbonate ooze, Samoan hotspot region, South Pacific Ocean
Low-temperature hydrothermal manganese oxides occur throughout the global oceans. However, the hydrothermal replacement of a carbonate ooze by manganese oxides is described here for the first time. The 24 samples dredged from three locations around the Territory of American Samoa in the South Pacific Ocean include six samples with remnant carbonate and volcaniclastic sediments, which we...
Authors
James R. Hein, Amy Gartman, Kira Mizell, Mark Baskaran, Anthony Koppers, Hubert Staudigel
Effects of storm surge exceedance value on overwash and inundation forecasts Effects of storm surge exceedance value on overwash and inundation forecasts
Hurricane induced sediment transport and flooding can cause catastrophic damage to coastal communities. Forecasts test our understanding of the drivers of sediment transport and flooding, as well as quantify potential storm effects on coastlines. Real-time availability of forecasts allows emergency response and management decisions to be made with additional information. This study...
Authors
Margaret L. Palmsten, Kirsten J. Bendik, Kara S. Doran, Justin J. Birchler, Johnathan Lucas Woodruff
When best intentions are not enough - A collaboration between scientists, policymakers, and an agricultural community When best intentions are not enough - A collaboration between scientists, policymakers, and an agricultural community
Rocky Mountain National Park is a Congressionally mandated Clean Air Act Class I Area, but years of research have documented evidence of biogeochemical and ecological change caused by atmospheric deposition of nitrogen. A coalition of government agencies—National Park Service, the Environmental Protection Agency Region 8, and the State of Colorado—developed the 2007 Nitrogen Deposition...
Authors
Jill Baron, Sarah Lindley, Jeffrey Collett, Lillian Naimie
Evaluation of submersible pressure transducers for streamflow monitoring in small streams Evaluation of submersible pressure transducers for streamflow monitoring in small streams
Compact streamgages requiring minimal infrastructure and equipped with submersible pressure transducers (PTs) are increasingly used to monitor small streams, yet disparate implementations obscure their accuracy under real-world conditions. This study isolated instrumentation-derived uncertainty in stage monitoring by co-locating various combinations of commercial vented and unvented PTs...
Authors
Maxwel Fredrick Schwid, Kyle W. Blasch, Jennifer H. Fair, Brandon Overstreet, Laura A. Hempel, Michael Allen
Synthesizing a twelve-year sediment trap time series of planktic foraminiferal flux in the Gulf of America (Mexico) Synthesizing a twelve-year sediment trap time series of planktic foraminiferal flux in the Gulf of America (Mexico)
Sediment trap time series provide powerful frameworks for testing hypotheses about planktic foraminiferal assemblage composition, seasonality, and geochemical responses to environmental variability, all of which are central to improving paleoceanographic reconstructions. We present high resolution foraminiferal assemblage data from a long-running sediment trap (2008–2020) in the northern...
Authors
Julie N. Richey, Caitlin E. Reynolds, Emily B. Osborne, Maoli N. Vizcaino, Eric J. Tappa
Polystyrene microplastics alter the accumulation and elimination dynamics of silver nanoparticles in Daphnia magna Polystyrene microplastics alter the accumulation and elimination dynamics of silver nanoparticles in Daphnia magna
Rationale Microplastics (MPs) can interact with engineered nanomaterials and alter their environmental fate and bioavailability. However, their influence on the bioaccumulation dynamics of silver nanoparticles (AgNPs) in aquatic filter feeders under environmentally relevant conditions remains poorly understood. We hypothesized that polystyrene microplastics (PS-MPs) alter the uptake...
Authors
Sara Kamanmalek, Piper MacDonald, Hannah Hutton, Noor Sheikh, Marie Noele Croteau, Mahbub Alam, Mohammed Baalousha, Niveen Ismail
Evolution of arsenic speciation during thermal treatment simulating wildfire heating in arsenic-rich sediments Evolution of arsenic speciation during thermal treatment simulating wildfire heating in arsenic-rich sediments
Understanding arsenic transformations during wildfires can help better constrain the environmental impacts of increased wildfire intensity, frequency, and burned area. Previous studies have monitored the evolution of metal(loid) speciation at specific time/temperature endpoints, hampering the comprehension of the dynamic transformations of metal(loid)s during wildfires. Here, a novel...
Authors
Mohammed Baalousha, Morgane Desmau, Andrea L. Foster
Long-term effects of rangeland improvements on cattle distribution: A ranch-scale case study Long-term effects of rangeland improvements on cattle distribution: A ranch-scale case study
Resource matching can be a common assumption that underlies anthropogenic rangeland improvements for wildlife or livestock. Countless resources are spent on targeted vegetation manipulations for both livestock and wildlife, but selection for improved areas has not been well quantified in livestock. This case study investigates whether cattle exhibit preferential use of historically...
Authors
Sebastian Schreiber, Erica Francis Stuber, Juan J Villalba, Eric Thacker
Widespread landslide activity in an extreme wet season and implications for regional sediment management, eastern San Francisco Bay area, California Widespread landslide activity in an extreme wet season and implications for regional sediment management, eastern San Francisco Bay area, California
Watershed sediment production is expected to increase in a warmer future with more extreme rain, with cascading effects throughout drainage and sediment-transport networks. This study investigated landscape-scale sediment movement in the eastern San Francisco Bay area, California, USA, during the extreme 2016–2017 wet season that brought major rainfall, landslides, and flooding. Mapping...
Authors
Amy E. East, Amy Foxgrover, Skye C. Corbett, Brian D. Collins, Andrew C. Ritchie
Microclimate mediates the strength and direction of avian biotic interactions Microclimate mediates the strength and direction of avian biotic interactions
Theory predicts that that the strength and direction of species interactions can shift from being competitive in benign environments toward being facilitative in stressful environments. However, the environmental context dependency of species interactions has rarely been tested in animal communities. We capitalized on a 15-year, landscape-scale dataset, collected annually in a relatively...
Authors
Sarah J. Frey, Brian Daniel Gerber, Adam S. Hadley, Hankyu Kim, Madison Sutton, Nina C. Ferrari, Matthew G. Betts
A roadmap for identifying and interpreting physical processes and national water model prediction bias associated with baseflow index regimes across the contiguous United States A roadmap for identifying and interpreting physical processes and national water model prediction bias associated with baseflow index regimes across the contiguous United States
Understanding how groundwater–surface water interactions shape streamflow variability is critical for diagnosing low flow behavior and prediction bias in continental scale hydrologic models. We present a process informed framework that links observed baseflow (BF) dynamics, watershed attributes, and National Water Model (NWM) performance across the contiguous United States. Using daily...
Authors
Ryan van der Heijden, Ali Dadkhah, Scott Douglas Hamshaw, Mandar Dewoolkar, Ehsan Ghazanfari, Norm Jones, Gustavious Williams, Prabhakar Clement, Donna M. Rizzo
Getting the story straight: Common misconceptions around volcanoes and eruptions with case studies of recent events Getting the story straight: Common misconceptions around volcanoes and eruptions with case studies of recent events
The ability to rapidly disseminate scientific knowledge across the world has never been greater. This is paralleled by the ability of rumors to spread equally far and fast. Popular misconceptions can take root and, without correction, take on the appearance of facts. Commonly misunderstood topics include those with attention-grabbing phrasing (e.g. “Pacific Ring of Fire”, “supervolcanoes...
Authors
Janine Krippner, Sam Poppe, Christian Farias, Ed Venzke, Michael Poland, B. Behncke, Sara K. McBride, Jessica L. Ball, Diana Roman, Heather K. Handley, Claire J. Horwell, Benjamin R Edwards, Loÿc Vanderkluysen, Carol Stewart, Emma J. Nicholson, Alia Juman, Ma. Mylene Martinez-Villegas,, Brian Terbush, Erik W. Klemetti, Jazmin Scarlett, Rebecca Williams, Valerie A. Finlayson, Kadie Bennis, Sally K. Sennert, Thomas C. Pierson, Devy K. Syahbana, Arianna Soldati