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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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Effects of auto-adaptive localization on a model calibration using ensemble methods Effects of auto-adaptive localization on a model calibration using ensemble methods
Simulations of the natural systems for environmental decision-making typically benefit from a highly parameterized approach (Hunt et al. 2007; Doherty and Hunt 2010), which enhances the flow of information contained in state observations to the parameters and improves application to decision support. However, parameter estimation (PE) with highly parameterized environmental models using
Authors
Jonathan P. Traylor, Randall J. Hunt, Jeremy White, Michael N. Fienen
A global long-term daily reanalysis of reference evapotranspiration for drought and food-security monitoring A global long-term daily reanalysis of reference evapotranspiration for drought and food-security monitoring
NOAA has developed a global reference evapotranspiration (ET0) reanalysis using the UN Food and Agriculture Organization formulation (FAO-56) of the Penman-Monteith equation forced by MERRA phase 2 (MERRA2) meteorological and radiative drivers. The NOAA ET0 reanalysis is provided daily from January 1, 1980 to the near-present at a resolution of 0.5° latitude × 0.625° longitude. The...
Authors
Mike Hobbins, Timen Jansma, Daniel Sarmiento, Amy McNally, Tamuka Magadzire, Harikishan Jayanthi, Will Turner, Andrew Hoell, Greg Husak, Gabriel B. Senay, Olena Boiko, Michael Budde, Pamella Magone, Candida Dewes
Intestinal lesions and parasites associated with senescence and prespawn mortality in Chinook Salmon (Oncorhynchus tshawytscha) Intestinal lesions and parasites associated with senescence and prespawn mortality in Chinook Salmon (Oncorhynchus tshawytscha)
Prespawn mortality (PSM) presents a major problem for the recovery of spring Chinook Salmon (Oncorhynchus tshawytscha) populations. In the Willamette River, Oregon, PSM exceeds 90% in some years but factors explaining it are not well understood. We examined intestinal tissue samples using histological slides from over 783 spring Chinook Salmon collected between 2009 and 2021, which...
Authors
S. Nervino, T. Polley, James T. Peterson, C.B. Schreck, M.L. Kent, J.D. Alexander
Effect of feeding history on metabolic rate of largemouth bass (Micropterus nigricans): implications for bioenergetics models Effect of feeding history on metabolic rate of largemouth bass (Micropterus nigricans): implications for bioenergetics models
Metabolic rate is a key parameter in fish energy budgets that strongly influences the output of bioenergetics models. In this study, we tested the hypothesis that metabolic rate varies with growth history of age-1 largemouth bass Micropterus nigricans Cuvier, 1828. Two groups of fish were fed alternating maintenance or ad libitum rations of fathead minnow Pimephales promelas Rafinesque...
Authors
Steven H. Ranney, Steven R. Chipps, David H. Wahl
Monitoring population-level foraging distribution of a marine migratory species from land: Strengths and weaknesses of the isotopic approach on the Northwest Atlantic loggerhead turtle aggregation Monitoring population-level foraging distribution of a marine migratory species from land: Strengths and weaknesses of the isotopic approach on the Northwest Atlantic loggerhead turtle aggregation
Assessing the linkage between breeding and non-breeding areas has important implications for understanding the fundamental biology of and conserving animal species. This is a challenging task for marine species, and in sea turtles a combination of stable isotope analysis (SIA) and satellite telemetry has been increasingly used. The Northwest Atlantic (NWA) loggerhead (Caretta caretta)...
Authors
Simona A. Ceriani, Susan Murasko, David S. Addison, David Anderson, Greg Curry, Nicole A. Desjardin, Scott F. Eastman, Daniel R. Evans, Nancy Evou, Mariana M.P.B. Fuentes, Matthew H. Godfrey, Kristen Hart, Paul Hillbrand, Sarah E. Hirsch, Cody R. Mott, Katherine L. Mansfield, Kristen T. Mazzarella, Sarah V. Norris, S. Michelle Pate, Katrina F. Phillips, Kirt W. Rusenko, Brian M. Shamblin, Amber Stevenson, Kelly A. Sloan, Anton D. Tucker, Ryan C. Welsh, Paolo Casale
Mountain glaciers influence biogeochemical and ecological characteristics of high-elevation lakes across the northern Rocky Mountains, USA Mountain glaciers influence biogeochemical and ecological characteristics of high-elevation lakes across the northern Rocky Mountains, USA
Mountain glaciers are retreating rapidly due to climate change, leading to the formation of downstream lakes. However, little is known about the physical and biogeochemical conditions in these lakes across a range of glacial influence. We surveyed alpine lakes fed by both glacial and snowpack meltwaters and those fed by snowpack alone to compare nutrient concentrations, stoichiometry...
Authors
Joseph Vanderwall, Clint C. Muhlfeld, Tyler Tappenback, Joe Giersch, Ze Ren, Jim Elser
Going with the floe: Sea-ice movement affects distance and destination during Adélie penguin winter movements Going with the floe: Sea-ice movement affects distance and destination during Adélie penguin winter movements
Seasonal migration, driven by shifts in annual climate cycles and resources, is a key part of the life history and ecology of species across taxonomic groups. By influencing the amount of energy needed to move, external forces such as wind and ocean currents are often key drivers of migratory pathways exposing individuals to varying resources, environmental conditions, and competition...
Authors
Dennis Jongsomjit, Amelie Lescroël, Annie Schmidt, Simeon Lisovski, David G. Ainley, Ellen Hines, Megan Elrod, Katie M. Dugger, Grant Ballard
An agricultural package for MODFLOW 6 using the Application Programming Interface An agricultural package for MODFLOW 6 using the Application Programming Interface
An agricultural water use package has been developed for MODFLOW 6 using the MODFLOW Application Programming Interface (API). The MODFLOW API Agricultural Water Use Package (API-Ag) was based on the approach to simulate irrigation demand in the MODFLOW-NWT and GSFLOW Agricultural Water Use (AG) Package. The API-Ag Package differs from the previous approach by implementing new features...
Authors
Joshua Larsen, Christian D. Langevin, Joseph D. Hughes, Richard G. Niswonger
Using high-frequency monitoring data to quantify city-wide suspended-sediment load and evaluate TMDL goals Using high-frequency monitoring data to quantify city-wide suspended-sediment load and evaluate TMDL goals
Excess sediment is a common reason water bodies in the USA become listed as impaired resulting in total maximum daily loads (TMDL) that require municipalities to invest millions of dollars annually on management practices aimed at reducing suspended-sediment loads (SSLs), yet monitoring data are rarely used to quantify SSLs and track TMDL progress. A monitoring network was created to...
Authors
Samuel Adam Miller, James S. Webber, John D. Jastram, Marcus F Aguilar
Airport deicers: An unrecognized source of phosphorus loading in receiving waters Airport deicers: An unrecognized source of phosphorus loading in receiving waters
Airport ice control products contributed to total phosphorus (TP) loadings in a study of surface water runoff at a medium-sized airport from 2015 to 2021. Eleven airport ice control products had TP concentrations from 1–807 mg L–1 in liquid formulas, while solid pavement deicer had a TP concentration of 805 mg kg–1. Product application data, formula TP concentrations, and surface water...
Authors
Owen M. Stefaniak, Steven R. Corsi, Troy D. Rutter, Greg G. Failey
Microhabitat use of native Santa Ana sucker and arroyo chub in an effluent-dominated southern California stream Microhabitat use of native Santa Ana sucker and arroyo chub in an effluent-dominated southern California stream
A significant amount of the base flow of the Santa Ana River, located within California's arid Los Angeles metropolitan region, originates from two wastewater treatment facilities: the Rialto wastewater treatment facility and Rapid Infiltration and Extraction facility. The Santa Ana sucker (Pantosteus santaanae, syn. Catostomus santaanae) and arroyo chub (Gila orcuttii) are two native...
Authors
Brock Huntsman, Larry R. Brown, Jason May, Kai Palenscar, Kerwin Russell, Heather Dyer, Marissa L. Wulff, Brett Mills, Chris Jones
Tourist perceptions of climate change impacts on mountain ecotourism in southern Mexico Tourist perceptions of climate change impacts on mountain ecotourism in southern Mexico
Climate change impacts on tourism are well documented, with most studies focusing on challenges facing ski or beach tourism. While non-ski, mountain tourism accounts for almost one fifth of tourism worldwide, there is a dearth of research on tourists’ perceptions of climate change impacts and their effects on tourism demand in these areas. This study, conducted at the ecotourism...
Authors
Ginger Deason, Erin Seekamp, Adam Terando, Camila Rojas