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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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What controls suspended-sediment concentration and export in flooded agricultural tracts in the Sacramento-San Joaquin Delta? What controls suspended-sediment concentration and export in flooded agricultural tracts in the Sacramento-San Joaquin Delta?
We investigated wind-wave and suspended-sediment dynamics in Little Holland Tract and Liberty Island, two subsided former agricultural tracts in the Cache Slough complex in the northern Sacramento-San Joaquin Delta which were restored to tidal shallows to improve habitat. Turbidity, and thus suspended-sediment concentration (SSC), is important to habitat quality because some species of...
Authors
Jessica R. Lacy, Evan T. Dailey, Tara L. Morgan-King
The future of coastal monitoring through satellite remote sensing The future of coastal monitoring through satellite remote sensing
Satellite remote sensing is transforming coastal science from a “data-poor” field into a “data-rich” field. Sandy beaches are dynamic landscapes that change in response to long-term pressures, short-term pulses, and anthropogenic interventions. Until recently, the rate and breadth of beach change have outpaced our ability to monitor those changes, due to the spatiotemporal limitations of...
Authors
Sean Vitousek, Dan Buscombe, Kilian Vos, Patrick L. Barnard, Andrew C. Ritchie, Jonathan A. Warrick
Skeletal indicators of locomotor adaptations in shrews Skeletal indicators of locomotor adaptations in shrews
The Soricidae (Mammalia: Eulypotyphla) comprises more than 450 species inhabiting a variety of habitats on five continents. As a family, shrews employ a variety of locomotor modes that incorporate ambulatory, fossorial, aquatic, and scansorial behaviors, illustrating an ability to exploit a variety of natural substrates and their associated resources. In this study, the association of...
Authors
Neal Woodman
The Searsville Lake Site (California, USA) as a candidate Global boundary Stratotype Section and Point for the Anthropocene series The Searsville Lake Site (California, USA) as a candidate Global boundary Stratotype Section and Point for the Anthropocene series
Cores from Searsville Lake within Stanford University’s Jasper Ridge Biological Preserve, California, USA, are examined to identify a potential GSSP for the Anthropocene: core JRBP2018-VC01B (944.5 cm-long) and tightly correlated JRBP2018-VC01A (852.5 cm-long). Spanning from 1900 CE ± 3 years to 2018 CE, a secure chronology resolved to the sub-annual level allows detailed exploration of...
Authors
M. Allison Stegner, Elizabeth A. Hadly, Anthony D. Barnosky, SeanPaul La Selle, Brian L. Sherrod, R. Scott Anderson, Sergio A. Redondo, Maria Viteri, Karrie Weaver, Andrew Cundy, Pawel Gaca, Neil Rose, Handong Yang, Sarah A. Roberts, Irka Hajdas, Bryan A. Black, Trisha Spanbauer
Improving the operational simplified surface energy balance evapotranspiration model using the forcing and normalizing operation Improving the operational simplified surface energy balance evapotranspiration model using the forcing and normalizing operation
Actual evapotranspiration modeling is providing useful information for researchers and resource managers in agriculture and water resources around the world. The performance of models depends on the accuracy of forcing inputs and model parameters. We developed an improved approach to the parameterization of the Operational Simplified Surface Energy Balance (SSEBop) model using the...
Authors
Gabriel B. Senay, Gabriel Edwin Lee Parrish, Matthew Schauer, MacKenzie Friedrichs, Kul Bikram Khand, Olena Boiko, Stefanie Kagone, Ray Dittmeier, Saeed Arab, Lei Ji
Vulnerable waters are essential to watershed resilience Vulnerable waters are essential to watershed resilience
Watershed resilience is the ability of a watershed to maintain its characteristic system state while concurrently resisting, adapting to, and reorganizing after hydrological (for example, drought, flooding) or biogeochemical (for example, excessive nutrient) disturbances. Vulnerable waters include non-floodplain wetlands and headwater streams, abundant watershed components representing...
Authors
Charles R. Lane, Irena F. Creed, Heather E. Golden, Scott G. Leibowitz, David M. Mushet, Mark C. Rains, Qiusheng Wu, Ellen D’Amico, Laurie C. Alexander, Genevieve A. Ali, Nandita B. Basu, Micah G. Bennett, Jay R. Christensen, Matthew J. Cohen, Tim P. Covino, Ben DeVries, Ryan A. Hill, Kelsey G. Jencso, Megan W. Lang, Daniel L. McLaughlin, Donald O. Rosenberry, Jennifer Rover, Melanie K. Vanderhoof
A review of the ecology and conservation biology of Sali (Micronesian Starling, Aplonis opaca guami) on Guam A review of the ecology and conservation biology of Sali (Micronesian Starling, Aplonis opaca guami) on Guam
The accidental introduction of the Brown Treesnake (BTS, Boiga irregularis) to Guam following World War II led to the extinction, extirpation, or severe decline of most of Guam’s native avifauna. One forest bird species that managed to persist is the cavity-nesting Såli (Micronesian Starling, Aplonis opaca guami), a once-ubiquitous native omnivore whose current Guam distribution is...
Authors
Andre Van Nguyen, Martin Kastner, Gary Wiles, Christopher Wagner, Henry S. Pollock, Haldre S. Rogers, Laura Duenas, Evan C. Fricke, Evan M. Rehm, Robert M. McElderry, Shane R. Siers, Eben H. Paxton
Alaska terrestrial and marine climate trends, 1957–2021 Alaska terrestrial and marine climate trends, 1957–2021
Some of the largest climatic changes in the Arctic have been observed in Alaska and the surrounding marginal seas. Near-surface air temperature (T2m), precipitation (P), snowfall, and sea ice changes have been previously documented, often in disparate studies. Here, we provide an updated, long-term trend analysis (1957–2021; n = 65 years) of such parameters in ERA5, NOAA U.S. Climate...
Authors
Thomas J. Ballinger, Uma S. Bhatt, Peter A. Bieniek, Brian Brettschneider, Rick T. Lader, Jeremy S. Littell, Richard L. Thoman, Christine F. Waigl, John E. Walsh, Melinda A. Webster
An assessment of fish herding techniques: Management implications for mass removal and control of silver carp An assessment of fish herding techniques: Management implications for mass removal and control of silver carp
We assessed the effectiveness of herding techniques on adult Silver Carp Hypophthalmichthys molitrix in a tributary to the Missouri River. Sites (600 m) were contained using block nets and treated with one of five herding techniques: (1) a method commonly used by commercial fishers in the United States (commercial technique), (2) pulsed-DC electrofishing (electric technique), (3)...
Authors
Josey Lee Ridgway, Katelyn M. Lawson, Stephen August Shier, Robin D. Calfee, Duane Chapman
Anthropogenic landcover impacts fluvial dissolved organic matter composition in the Upper Mississippi River Basin Anthropogenic landcover impacts fluvial dissolved organic matter composition in the Upper Mississippi River Basin
Landcover changes have altered the natural carbon cycle; however, most landcover studies focus on either forest conversion to agriculture or urban, rarely both. We present differences in dissolved organic carbon (DOC) concentrations and dissolved organic matter (DOM) molecular composition within Upper Mississippi River Basin low order streams and rivers draining one of three dominant...
Authors
Derrick R. Vaughn, Anne M. Kellerman, Kimberly Wickland, Robert G. Striegl, David C. Podgorski, Jon R. Hawkings, Jaap Nienhuis, Mark Dornblaser, Edward G. Stets, Robert G. M. Spencer
Characterization of fish assemblages in eleven multi-use reservoirs from North Carolina, USA Characterization of fish assemblages in eleven multi-use reservoirs from North Carolina, USA
Managing impounded river systems is a recurring challenge for aquatic resource professionals because reservoirs serve multiple functions with different ecological and socioeconomic outcomes. However, research on fishes in reservoirs has disproportionally focused on recreationally and economically important species, with less attention directed toward fish assemblages despite the...
Authors
Stephen W. Parker, Tyler Steven Coleman, Andrew Kenneth Carlson, Jesse R. Fischer
Delayed incubation leads to hatching failure of a Burrowing Owl (Athene cunicularia) nest Delayed incubation leads to hatching failure of a Burrowing Owl (Athene cunicularia) nest
Birds face strong selective pressures to complete individual nesting attempts as quickly as possible to minimize exposure of nests to predators and weather, maximize renesting potential, and maximize hatching success. As a result, the duration of developmental periods and of overall nest periods are often relatively constant within species. However, birds may sometimes be subject to...
Authors
Carl G. Lundblad, Courtney J. Conway