Skip to main content
U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.


Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Results

179289 results.

Alternate formats: RIS file of the first 3000 search results  |  Download all results as CSV | TSV | Excel  |  RSS feed based on this search  |  JSON version of this page of results

Page 3, results 51 - 75

Show results on a map

Publication Extents

Not all publications have extents, not all extents are completely accurate
Siting considerations for satellite observation of river discharge
Jack R. Eggleston, Chris A. Mason, David M. Bjerklie, Michael T. Durand, Robert W. Dudley, Merritt Elizabeth Harlan
2024, Water Resources Research (60)
With growing global capability for satellite measurement of river discharge (flow) comes a need to understand and reduce error in satellite-based discharge measurements. Satellite-based discharge estimates are based on measurements of water surface width, elevation, slope, and potentially velocity. Site selection is important for reducing error and...
A reproducible manuscript workflow with a Quarto template
Richard A. Erickson, Althea A. Archer, Michael N. Fienen
2024, Journal of Fish and Wildlife Management
Scientists and resource managers increasingly use Markdown-based tools to create reproducible reports and manuscripts. These workflows allow people to use standardized methods that are more reproducible, efficient, and transparent than other standard office tools. We present a Quarto template and demonstrate how this...
A spatial machine learning model developed from noisy data requires multiscale performance evaluation: Predicting depth to bedrock in the Delaware River Basin, USA
Phillip J. Goodling, Kenneth Belitz, Paul Stackelberg, Brandon J. Fleming
2024, Environmental Modelling & Software (179)
Spatial machine learning models can be developed from observations with substantial unexplainable variability, sometimes called ‘noise’. Traditional point-scale metrics (e.g., R2) alone can be misleading when evaluating these models. We present a multi-scale performance evaluation (MPE) using two additional scales (distributional and geostatistical). We apply the MPE framework to predictions...
Back from the brink: Estimating daily and annual abundance of natural-origin salmon smolts from 30-years of mixed-origin capture-recapture data
Dalton Hance, John Plumb, Russell Perry, Kenneth Tiffan
2024, Fisheries Research (278)
Evaluating the status and trends of natural-origin anadromous fish populations over time requires robust estimates of out-migrating juvenile abundance. Information on abundance is typically acquired by capturing actively migrating fish as they pass stationary monitoring platforms. Challenges to estimation include protracted migration timing, temporally varying capture probabilities and the contemporaneous...
Thermo-hydrologic processes governing supra-permafrost talik dynamics in discontinuous permafrost near Umiujaq (Québec, Canada)
Philippe Fortier, Nathan Young, Michelle A. Walvoord, Jean-Michel Lemieux, Aaron Mohammed
2024, Conference Paper, Proceedings of the 12th International Conference on Permafrost
Widespread supra-permafrost talik formation is currently recognized as a critical mechanism that could accelerate permafrost thaw in the Arctic (e.g., Connon et al. 2018; Farquharson et al. 2022). However, the trajectory of permafrost dynamics following talik formation may prove difficult to predict. Physically-based cryohydrogeologic models provide a powerful tool for understanding processes and factors controlling talik dynamics and,...
A history of cryohydrogeology modeling and recent advancements through the integration of solute transport
Barret L. Kurylyk, Julia Guimond, Aaron Mohammed, Victor F. Bense, Jeffrey M. McKenzie, Michelle A. Walvoord, Rob Jamieson, R. Bailey Strong
2024, Conference Paper, Proceedings of the 12th International Conference on Permafrost
Groundwater flow systems and permafrost are interrelated because permafrost thaw enhances permeability, while groundwater flow can advect heat and accelerate permafrost thaw (McKenzie et al. 2021). Given amplified climate change in cold regions, there is renewed interest in ‘cryohydrogeology’, the study of groundwater in cold regions. Many data-driven studies have...
Thermal and hydrological limitations on modeling carbon dynamics at wetland sites of discontinuous and continuous permafrost extent
Benjamin C. Maglio, Ruth Rutter, Tobey Carman, Colin W. Edgar, Eugénie S. Euskirchen, Hélène Genet, Andrew Mullen, Valeria Briones, Elchin Jafarov, Kristen L. Manies
2024, Conference Paper, Proceedings of the 12th International Conference on Permafrost
Accurate representation of cryohydrological processes is fundamental for biosphere models, particularly at high-latitudes, given their influence on carbon and permafrost dynamics in carbon-rich peatlands and wetlands. This study analyzes site-level simulations in moist and wet drainage conditions in continuous or discontinuous permafrost regions, using a terrestrial ecosystem model DVM-DOS-TEM. Functional...
Amur Falcon Falco amurensis
Jaume Orta, Guy M. Kirwan, Jeffrey S. Marks, Ryan C. Burner, Sundev Gombobaatar, Paul van Els, Chuenchom Hansasuta
2024, Book chapter, Birds of the world
No abstract available....
Iron oxyhydroxide-rich hydrothermal deposits at the high-temperature Fåvne vent field, Mohns Ridge
Caroline Gini, John Jamieson, Eoghan P. Reeves, Amy Gartman, Thibaut Barreyre, Michael G. Babechuk, Steffen L. Jørgensen, Katleen Robert
2024, Geochemistry, Geophysics, Geosystems (25)
The recently discovered Fåvne vent field, located at 3,040 m depth on the slow-spreading Mohns mid-ocean ridge between Greenland and Norway, is a high-temperature (≥250°C) vent field that is characterized by Fe oxyhydroxide-rich and S-poor chimneys and mounds. The vent field is located on both the hanging wall and footwall of...
Projected sea-level rise and high tide flooding at De Soto National Memorial, Florida
Hana R. Thurman, Nicholas M. Enwright, Michael J. Osland, Davina L. Passeri, Richard H. Day, Bethanie M. Simons
2024, Fact Sheet 2024-3016
IntroductionNational parks and preserves in the South Atlantic-Gulf Region contain valuable coastal habitats such as tidal wetlands and mangrove forests, as well as irreplaceable historic buildings and archeological sites located in low-lying areas. These natural and cultural resources are vulnerable to accelerated sea-level rise and escalating high tide flooding events....
Dissolved arsenic concentrations in surface waters within the upper portions of the Klamath River Basin, Oregon and California
Marie Noële Croteau, Brent R. Topping, Rick A. Carlson
2024, Scientific Investigations Report 2024-5029
Arsenic toxicity is an environmental health problem. Levels of arsenic in surface waters at some locations in the Klamath River Basin in southern Oregon and northern California can exceed the U.S. Environmental Protection Agency (EPA) standard for drinking water. There are both anthropogenic and natural sources of arsenic. The Klamath...
System characterization report on the Gaofen-6
Aparajithan Sampath, Jon Christopherson, Seonkyung Park, Minsu Kim, Gregory L. Stensaas, Cody Anderson
2024, Open-File Report 2021-1030-M
Executive SummaryGaofen-6 represents a series of Chinese high-resolution Earth observation satellites. More than 12 satellites have been launched in the Gaofen series, beginning with Gaofen-1 in 2013. Satellites within the series have varying infrared, radar, and optical imaging capabilities. The primary goal for the satellites in this series is to...
Distribution, abundance, and breeding activities of the Least Bell's Vireo at Marine Corps Base Camp Pendleton, California—2020 annual report
Suellen Lynn, Michelle Treadwell, Barbara E. Kus
2024, Open-File Report 2024-1009
Executive SummaryThe purpose of this report is to provide the Marine Corps with an annual summary of abundance, breeding activity, demography, and habitat use of endangered Least Bell’s Vireos (Vireo bellii pusillus) at Marine Corps Base Camp Pendleton (MCBCP, or Base). Surveys for the Least Bell's Vireo were conducted...
Distribution, Abundance, and Breeding Activities of the Southwestern Willow Flycatcher at Marine Corps Base Camp Pendleton, California—2020 Annual Report
Scarlett L. Howell, Barbara E. Kus
2024, Open-File Report 2024-1005
Executive SummarySurveys for the endangered Southwestern Willow Flycatcher (Empidonax traillii extimus) were done at Marine Corps Base Camp Pendleton (MCBCP or “Base”), California, between May 4 and July 31, 2020. All of MCBCP’s historically occupied riparian habitat (core survey area) was surveyed for flycatchers in 2020. Additionally, one-fifth of the...
Effects of elevated pCO2 on bioenergetics and disease susceptibility in Pacific herring Clupea pallasii
Christopher Murray, Jacob L. Gregg, Ashley MacKenzie, Hiruni Jayasekara, Sophie Hall, Terrie Klinger, Paul Hershberger
2024, Marine Ecology Progress Series. (738) 225-242
Ocean acidification can affect the immune responses of fish, but effects on pathogen susceptibility remain uncertain. Pacific herring Clupea pallasii were reared from hatch under 3 CO2 partial pressure ( pCO2) treatments (ambient, ∼650 µatm; intermediate, ∼1500 µatm; high, ∼3000 µatm) through metamorphosis (98 d) to evaluate the effects of ocean acidification on bioenergetics...
Evaluation of extinction risk for stream fishes within an urban riverscape using population viability analysis
Brock Huntsman, Kai Palenscar, Kerwin Russell, Brett Mills, Chris Jones, William Ota, Kurt E. Anderson, Heather Dyer, Fitsum Abadi, Marissa L. Wulff
2024, Aquatic Conservation: Marine and Freshwater Ecosystems (34)
1. The Santa Ana River in the Los Angeles region of California demonstrates common habitat degradation symptoms that are characteristic of the urban stream syndrome. These impacts have altered the Santa Ana River community structure, with few species as impacted as the native Santa Ana sucker (sucker; Pantosteus santaanae). 2. Consequently,...
Signatures of wave erosion in Titan’s coasts
Rose Elizabeth Palermo, Andrew D. Ashton, Jason M. Soderblom, Samuel P. D. Birch, Alexander G. Hayes, J. Taylor Perron
2024, Science Advances (10)
The shorelines of Titan’s hydrocarbon seas trace flooded erosional landforms such as river valleys; however, it is unclear whether coastal erosion has subsequently altered these shorelines. Spacecraft observations and theoretical models suggest that wind may cause waves to form on Titan’s seas, potentially driving coastal erosion, but the observational evidence...
Demographics of a previously undocumented diamondback terrapin (Malaclemys terrapin) population
Daniel J. Catizone, Travis M. Thomas, Christina Romagosa, Margaret Lamont
2024, Estuaries and Coasts
Coastal habitats are some of the most imperiled due to climate change and anthropogenic activities. As such, it is important to understand population dynamics of the species that may play a role in regulating coastal systems. Diamondback terrapins in Northwest Florida have been understudied, which has resulted in a gap...
Distribution, abundance, and habitat characteristics of Coastal Cactus Wrens (Campylorhynchus brunneicapillus) in San Diego County, California—2023 Data Summary
Suellen Lynn, Barbara E. Kus
2024, Data Report 1196
Executive SummaryWe surveyed for coastal Cactus Wren (Campylorhynchus brunneicapillus) in 507 established plots in San Diego County in 2023, encompassing 4 genetic clusters (Otay, Lake Jennings, Sweetwater/Encanto, and San Pasqual). Two surveys were completed at each plot between March 1 and July 31. Cactus Wrens were detected in 181 plots...
Nihoa and Laysan Island passerines population abundances, trends, and habitat utilization
Trevor Bak, Richard J. Camp, Chris Farmer, Rachel A. Rounds, Sheldon M. Plentovich, John Vetter, Paul C. Banko
2024, Report, Hawaii Cooperative Studies Unit Technical Report Series
Nihoa and Laysan Island, part of the Northwestern Hawaiian Islands, are host to three endangered passerine species—Nihoa finch (Telespiza ultima), Nihoa millerbird (Acrocephalus familiaris kingi), and Laysan finch (Telespiza cantans). Using point-transect distance sampling survey records from 2010 to 2022 for Nihoa and 2013...
Visualizing wading bird optimal foraging decisions with aggregation behaviors using individual-based modeling
Simeon Yurek, Donald L. DeAngelis, Hyo Won Lee, Stephen Tennenbaum
2024, Ecological Modelling (493)
Foragers on patchy landscapes must efficiently balance time between searching for and consuming resources to meet their daily energetic requirements. Spatial aggregation foraging behaviors may improve foraging efficiency by sharing information on locations of resource hotspots. Wading birds are an example of patch foragers that form colonial aggregations during the...
Peak streamflow trends in Illinois and their relation to changes in climate, water years 1921–2020
Mackenzie K. Marti, Thomas M. Over
2024, Scientific Investigations Report 2023-5064-B
This report characterizes changes in peak streamflow in Illinois and the relation of these changes to climatic variability, and provides a foundation for future studies that can address nonstationarity in peak-flow frequency analysis in Illinois. Records of annual peak and daily streamflow at streamgages and gridded monthly climatic data (observed...
Evaluation of short-term mussel test for estimating toxicity
Ning Wang, James L. Kunz, Chris D. Ivey, Danielle M. Cleveland, Jeffery Steevens
2024, Environmental Toxicology and Chemistry
Effect concentrations of ammonia, nickel, sodium chloride, and potassium chloride from short-term 7-day tests were compared to those from standard chronic 28-day toxicity tests with juvenile mussels (fatmucket, Lampsilis siliquoidea) to evaluate the sensitivities of the 7-day tests. The effect concentrations for nickel (59 µg Ni/L), chloride...
Catchment coevolution and the geomorphic origins of variable source area hydrology
David G Litwin, Gregory E. Tucker, Katherine R. Barnhart, Ciaran Harman
2024, Water Resources Research (60)
Features of landscape morphology—including slope, curvature, and drainage dissection—are important controls on runoff generation in upland landscapes. Over long timescales, runoff plays an essential role in shaping these same features through surface erosion. This feedback between erosion and runoff generation suggests that modeling long-term landscape evolution together...