Articles
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
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.
Filter Total Items: 77848
Summer/fall diet and macronutrient assimilation in an Arctic predator Summer/fall diet and macronutrient assimilation in an Arctic predator
Free-ranging predator diet estimation is commonly achieved by applying molecular-based tracers because direct observation is not logistically feasible or robust. However, tracers typically do not represent all dietary macronutrients, which likely obscures resource use as prey proximate composition varies and tissue consumption can be specific. For example, polar bears (Ursus maritimus)
Authors
Craig A. Stricker, Karyn D. Rode, Brian D. Taras, Jeffrey F. Bromaghin, Lara Horstmann, Lori T. Quakenbush
Seed menus: An integrated decision-support framework for native plant restoration in the Mojave Desert Seed menus: An integrated decision-support framework for native plant restoration in the Mojave Desert
The combination of ecosystem stressors, rapid climate change, and increasing landscape-scale development has necessitated active restoration across large tracts of disturbed habitats in the arid southwestern United States. In this context, programmatic directives such as the National Seed Strategy for Rehabilitation and Restoration have increasingly emphasized improved restoration...
Authors
Daniel F. Shryock, Lesley A. DeFalco, Todd Esque
Global genetic diversity status and trends: Towards a suite of Essential Biodiversity Variables (EBVs) for genetic composition Global genetic diversity status and trends: Towards a suite of Essential Biodiversity Variables (EBVs) for genetic composition
Biodiversity underlies ecosystem resilience, ecosystem function, sustainable economies, and human well-being. Understanding how biodiversity sustains ecosystems under anthropogenic stressors and global environmental change will require new ways of deriving and applying biodiversity data. A major challenge is that biodiversity data and knowledge are scattered, biased, collected with...
Authors
Sean M. Hoban, Frederick I. Archer, Laura D. Bertola, Jason G. Bragg, Martin F. Breed, Michael W. Bruford, Melinda A. Coleman, Robert Ekblom, W. Chris Funk, Catherine E. Grueber, Brian K. Hand, Rodolfo Jaffé, Evelyn Jensen, Jeremy S. Johnson, Francine Kershaw, Libby Liggins, Anna J. MacDonald, Joachim Mergeay, Joshua M. Miller, Frank Muller-Karger, David O'Brien, Ivan Paz-Vinas, Kevin M. Potter, Orly Razgour, Cristiano Vernesi, Margaret Hunter
Lack of evidence for indirect effects from stonefly predators on primary production under future climate warming scenarios Lack of evidence for indirect effects from stonefly predators on primary production under future climate warming scenarios
Consumptive and non-consumptive interactions of predators and prey can have strong direct and indirect effects on primary producers, such as stream algae. Increasing water temperatures may alter these interactions and thus influence productivity in streams. For each of 3 temperature treatments (‘ambient’, +2°C and +4°C), we measured the amount of algal biomass removed by grazing mayflies...
Authors
Scott G. Morton, Travis S. Schmidt, N. LeRoy Poff
The potential of using fiber optic distributed acoustic sensing (DAS) in earthquake early warning applications The potential of using fiber optic distributed acoustic sensing (DAS) in earthquake early warning applications
As the seismological community embraces fiber optic distributed acoustic sensing (DAS), DAS arrays are becoming a logical, scalable option to obtain strain and ground‐motion data for which the installation of seismometers is not easy or cheap, such as in dense offshore arrays. The potential of strain data in earthquake early warning (EEW) applications has been recently demonstrated using...
Authors
Noha Farghal, Jessie Kate Saunders, Grace Alexandra Parker
Extent of sedge-grass meadow in a Lake Michigan drowned river mouth wetland dictated by topography and lake level Extent of sedge-grass meadow in a Lake Michigan drowned river mouth wetland dictated by topography and lake level
Water-level fluctuations are critical in maintaining diversity of plant communities in Great Lakes wetlands. Sedge-grass meadows are especially sensitive to such fluctuations. We conducted vegetation sampling in a sedge-grass dominated Lake Michigan drowned river mouth wetland in 1995, 2002, and 2010 following high lake levels in 1986 and 1997. We also conducted photointerpretation...
Authors
Douglas A. Wilcox, John A Bateman, Kurt P. Kowalski, James E Meeker, Nicole Dunn
Community-powered urban stream restoration: A vision for sustainable and resilient urban ecosystems Community-powered urban stream restoration: A vision for sustainable and resilient urban ecosystems
Urban streams can provide amenities to people living in cities, but those benefits are reduced when streams become degraded, potentially even causing harm (disease, toxic compounds, etc.). Governments and institutions invest resources to improve the values and services provided by urban streams; however, the conception, development, and implementation of such projects may not include...
Authors
Mateo Scoggins, Derek B. Booth, Tim Fletcher, Megan Fork, Ana Gonzalez, Rebecca Hale, Robert J. Hawley, Allison H. Roy, Erika E. Bilger, Nick Bond, Matthew James Burns, Kristina G. Hopkins, Marissa Ann Alessi, Eugenia Marti, S. Kyle McKay, Martin W. Neale, Michael J. Paul, Blanca Rios-Touma, Kathryn L Russell, Robert F. Smith, Staryn Wagner, Seth J. Wenger
Increased mercury and reduced insect diversity in linked stream-riparian food webs downstream of a historical mercury mine Increased mercury and reduced insect diversity in linked stream-riparian food webs downstream of a historical mercury mine
Historical mining left a legacy of abandoned mines and waste rock in remote headwaters of major river systems in the western United States. Understanding the influence of these legacy mines on culturally and ecological important downstream ecosystems is not always straight-forward because of elevated natural levels of mineralization in mining-impacted watersheds. To test the ecological...
Authors
Johanna M. Kraus, JoAnn M. Holloway, Michael J. Pribil, Ben N. Mcgee, Craig A. Stricker, Danny Rutherford, Andrew S. Todd
Soft pressure sensor for underwater sea lamprey detection Soft pressure sensor for underwater sea lamprey detection
In this paper, an economical and effective soft pressure sensor for underwater sea lamprey detection is proposed, which consists of an array of piezoresistive elements between two layers of perpendicular copper tape electrodes, forming a passive resistor network. With multiplexers, the apparent resistance corresponding to each pixel of the sensing matrix can be measured directly, where...
Authors
Hongyang Shi, Ian Gonzalez-Afanador, Christopher M. Holbrook, Nelson Sepulveda, Xiaobo Tan
Balancing model generality and specificity in management-focused habitat selection models for Gunnison sage-grouse Balancing model generality and specificity in management-focused habitat selection models for Gunnison sage-grouse
Identifying, protecting, and restoring habitats for declining wildlife populations is foundational to conservation and recovery planning for any species at risk of decline. Resource selection analysis is a key tool to assess habitat and prescribe management actions. Yet, it can be challenging to map suitable resource conditions across a wide range of ecological contexts and use the...
Authors
Dorothy Saher, Michael S. O’Donnell, Cameron L. Aldridge, Julie A. Heinrichs
Annual summer submersed macrophyte standing stocks estimated from long-term monitoring data in the Upper Mississippi River Annual summer submersed macrophyte standing stocks estimated from long-term monitoring data in the Upper Mississippi River
System-scale restoration efforts within the Upper Mississippi River National Wildlife and Fish Refuge have included annual monitoring of submersed aquatic vegetation (SAV) since 1998 in four representative reaches spanning ∼ 440 river kilometers. We developed predictive models relating monitoring data (site-scale SAV abundance indices) to diver-harvested SAV biomass, used the models to...
Authors
Deanne C. Drake, Eric M. Lund, Rebecca M. Kreiling
Planetary Aeolian landforms: An introduction to the Fifth Planetary Dunes Workshop Special Issue Planetary Aeolian landforms: An introduction to the Fifth Planetary Dunes Workshop Special Issue
Aeolian landforms are widespread in our solar system. Understanding the exact nature and processes of formation of these features are challenging tasks necessitating a strong collaboration between scientists with different skills and scientific backgrounds. This paper describes the special issue for the 5th International Planetary Dunes Workshop, which includes 15 research papers and...
Authors
Simone Silvestro, Timothy N. Titus