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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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Spatial and temporal variation in dissolved organic matter in urban streams in metropolitan Boston, Massachusetts (USA) Spatial and temporal variation in dissolved organic matter in urban streams in metropolitan Boston, Massachusetts (USA)
Urban riverine systems are heterogeneous, and the substantial variability in impervious cover, riparian cover, wetlands, and wastewater and stormwater infrastructure affect sources and transport of dissolved organic matter (DOM), of which dissolved organic C (DOC) is a substantial component. An understanding of the quantity, bioavailability, and timing of DOM inputs (a key energy source...
Authors
Annika M. Quick, Allison H. Roy, Rebecca L. Hale, Kristina G. Hopkins, Shuo Chen, Liz D. Ortiz Muñoz
Marsh sediment in translation: A review of sediment transport across a natural tidal salt marsh in northern San Francisco Bay Marsh sediment in translation: A review of sediment transport across a natural tidal salt marsh in northern San Francisco Bay
Deposition of inorganic sediment is essential for the sustainability of tidal salt marshes. Understanding variability in sediment sources and the processes of sediment delivery to salt marshes are high priorities for decision-makers responsible for managing sediment and conserving and restoring marshes. Research on sediment transport to marshes is published in technical journals, but...
Authors
Madeline R. Foster-Martinez, Matthew C. Ferner, John C. Callaway, Brenda Goeden, Jessica R. Lacy
Improving welfare of captured gopher tortoises (Gopherus polyphemus): Reducing trap time and temperature Improving welfare of captured gopher tortoises (Gopherus polyphemus): Reducing trap time and temperature
No abstract available.
Authors
Morgan A. Ubbelohde, Derek B. Breakfield, Elizabeth Ann Hunter, Kevin J. Loope
Abundance of ohiʻa-associated ambrosia beetles in two sites with rapid ohiʻa death outbreaks Abundance of ohiʻa-associated ambrosia beetles in two sites with rapid ohiʻa death outbreaks
ʻŌhiʻa lehua (Metrosideros polymorpha Gaudich.) is the dominant tree in native Hawaiian forests but is threatened by two pathogenic fungi (Ceratocystis spp.) which cause Rapid ʻŌhiʻa Death (ROD). Understanding the spread of ROD is vital to informing prevention and management strategies. Ambrosia beetles (Coleoptera: Curculionidae: Scolytinae) contribute to the spread of disease by...
Authors
Helen Sofaer, Sophia Smith, Robert W. Peck, Ellen Dunkle, Jorden Zarders, Naiʻa Odachi, Ryan L. Perroy
Fine-grained temporal population monitoring of a declining, critically endangered Hawaiian honeycreeper Fine-grained temporal population monitoring of a declining, critically endangered Hawaiian honeycreeper
Annual point counts are commonly used to monitor birds to track population densities across space and time. Palila (Loxioides bailleui) are surveyed annually in the first quarter, but we recently instituted quarterly sampling that offers a unique opportunity to improve estimator precision. We conducted point-transect distance sampling point counts during the first quarter of 2020 through...
Authors
Richard J. Camp, Chauncey K. Asing, Noah J. Hunt, Alexander Wang, Chris Farmer, Lindsey Neitmann, Paul C. Banko
Resolution sensitivities for subgrid modeling of coastal flooding Resolution sensitivities for subgrid modeling of coastal flooding
Flooding due to storm surge can propagate through coastal regions to threaten the built and natural environments. This propagation is controlled by geographic features of varying scales, from the largest oceans to the smallest marsh channels and sandy dunes. Numerical models to predict coastal flooding have been improved via the use of subgrid corrections, which use information about the...
Authors
Johnathan Lucas Woodruff, Joel C. Dietrich, Damrongsak Wirasaet, Andrew B. Kennedy, Diogo Bolster, Richard A. Luettich
Evaluating per- and polyfluoroalkyl substance (PFAS) prevalence and potential for biological effects in Lake Superior tributaries Evaluating per- and polyfluoroalkyl substance (PFAS) prevalence and potential for biological effects in Lake Superior tributaries
Several per- and polyfluoroalkyl substances (PFAS) are Great Lakes binational chemicals of mutual concern. Although known to be persistent, data gaps regarding PFAS prevalence and biological effects exist, especially within Lake Superior’s watershed. In this 2022 study of 27 United States tributaries to Lake Superior, water samples were collected during spring runoff, summer baseflow...
Authors
Matthew A. Pronschinske, Steven R. Corsi, Sarah M. Elliott, Martin M. Shafer, Kristen Hannon, Kaitlyn Gruber, Christina K. Remucal
Integrated distribution modeling resolves asynchrony between bat population impacts and occupancy trends through latent abundance Integrated distribution modeling resolves asynchrony between bat population impacts and occupancy trends through latent abundance
Monitoring populations is challenging for cryptic species with seasonal life cycles, where data from multiple field techniques are commonly collected and analyzed as multiple lines of evidence. Data integration can provide comprehensive inferences while improving accuracy, precision, and scope but faces challenges in modeling misaligned resolutions and observational uncertainties. We...
Authors
Bradley James Udell, Christian Stratton, Kathryn Irvine, Bethany R. Straw, Jonathan D. Reichard, Sarah M. Gaulke, Jeremy. T.H. Coleman, Frank C Tousley, Andrea Nichole Schuhmann, Rich D. Inman, Melinda Turner, Sarah Nystrom, Brian E. Reichert
Per- and polyfluoroalkyl substances in surface water and sediment in Great Lakes tributaries and relations with watershed attributes Per- and polyfluoroalkyl substances in surface water and sediment in Great Lakes tributaries and relations with watershed attributes
Per- and polyfluoroalkyl substances (PFAS) are chemicals of emerging concern that potentially pose risks to human and environmental health. In May–Oct 2018, sediment and passively collected surface water samples were collected from 62 tributary sites of the Laurentian Great Lakes with site catchments spanning various land cover types. Discrete samples of sediment collected manually and...
Authors
Luke C. Loken, Steven R. Corsi, David A. Alvarez, Matthew A. Pronschinske, Peter L. Lenaker, Michelle A. Nott, Chen Zhang, Erin Mani, Gerald T. Ankley
Foundational uncertainties in terminal Ediacaran chronostratigraphy revealed by high-precision zircon U-Pb geochronology of the Nama Group, Namibia Foundational uncertainties in terminal Ediacaran chronostratigraphy revealed by high-precision zircon U-Pb geochronology of the Nama Group, Namibia
The Nama Group of southern Namibia and northwestern South Africa hosts the best-dated mixed carbonate-siliciclastic foreland basin succession of the terminal Ediacaran [ca. 551 million years (Ma) ago to 1 Myr older than the depositional age of their respective ash beds when assuming existing stratigraphic correlations. If this scenario is preferred, then a cautious approach would be to...
Authors
Fred T. Bowyer, Fabio Messori, Rachel Wood, Ulf Linnemann, Esther Rojo-Perez, Mandy Zieger-Hofmann, Johannes Zieger, Junias Ndeunyema, Martin Shipanga, Bontle Mataboge, Dan Condon, Catherine V. Rose, Collen-Issia Uahengo, Sean Patrick Gaynor, Inigo A. Müller, Gerd Geyer, Torsten W. Vennemann, Joshua H.F.L. Davies, Maria Ovtcharova
Pesticide concentrations in multiple physical and biological stream matrices are impacted by a bioenergy production facility receiving pesticide coated corn seeds Pesticide concentrations in multiple physical and biological stream matrices are impacted by a bioenergy production facility receiving pesticide coated corn seeds
Insecticide and fungicide seed coatings have become prevalent in conventional agriculture in recent decades. From 2015 to 2021, the AltEn bioenergy plant (Mead, Nebraska, USA) generated ethanol from almost 100% unused/expired treated corn seeds. This use of these seeds for ethanol production resulted in the accumulation of large amounts of contaminated wastewater and solid residue, a...
Authors
Michelle L. Hladik, Dana W. Kolpin, Matthew D. De Parsia, Daniel D. Snow, Shannon Bartelt-Hunt, Brenda Densmore, Laura E. Hubbard, David L. Rus, Jonathan J. Spurgeon, Brittany G. Perrotta, Karen A. Kidd, Johanna M. Kraus, Carrie E. Givens, Christopher James Kotalik, David Walters
Tree swallow (Tachycineta bicolor) demographics and metal(loid) concentrations in egg contents from the Kootenai River basin, Montana nest box colonies Tree swallow (Tachycineta bicolor) demographics and metal(loid) concentrations in egg contents from the Kootenai River basin, Montana nest box colonies
Selenium (Se) levels in water have been increasing in Lake Koocanusa and the Kootenai River below Libby Dam in Montana due to coal mining in the drainage basin of the Elk River, British Columbia. Aquatic monitoring of Se is ongoing to assess potential effects; however, exposure to terrestrial, aquatic-dependent wildlife has not been investigated. Tree swallows are a targeted receptor for
Authors
Brian C. Balmer, Joseph P. Skorupa, Katherine B. Adams, Bridger M. Creel, Gregory C. Hoffman, Megan A. Fylling, Stephanie Le, Jacob M. Martin, W. Scott McBride, Jacob T. Williams, Travis S. Schmidt