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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.
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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Ediacaran-Ordovician magmatism and REE mineralization in the Wet Mountains, Colorado, USA: Implications for failed continental rifting Ediacaran-Ordovician magmatism and REE mineralization in the Wet Mountains, Colorado, USA: Implications for failed continental rifting
Structures associated with Ediacaran-Ordovician alkaline magmatism and the timing of rare earth element (REE) mineralization in the Wet Mountains, CO, were analyzed using field, geophysical, and U-Th-Pb isotope methods to interpret their tectonic setting in the context of previously proposed rift models. The Wet Mountains are known for thorium and REE mineralization associated with...
Authors
Benjamin Patrick Magnin, Yvette Kuiper, Eric D. Anderson
Assessing tradeoffs between current and desired vegetation condition in a National Park using historical maps and high resolution lidar data Assessing tradeoffs between current and desired vegetation condition in a National Park using historical maps and high resolution lidar data
In the United States, National Park Service Civil War battlefield units are managed for both historical accuracy (i.e., to represent landscape conditions at the time of the conflict for historical interpretation), and for natural resource protection. However, managing for both goals can create conflicts as many battlefields were largely open or in second growth forests historically, but...
Authors
John A. Young, Carolyn Mahan
The invasive plant data landscape: A synthesis of spatial data and applications for research and management in the United States The invasive plant data landscape: A synthesis of spatial data and applications for research and management in the United States
Context
Authors
Emily J. Fusco, Evelyn M. Beaury, Bethany A. Bradley, Michelle Cox, Catherine S. Jarnevich, Adam L. Mahood, R. Chelsea Nagy, Ty Nietupski, Jessica E. Halofsky
Mercury bioaccumulation and cortisol interact to influence endocrine and immune biomarkers in a free-ranging marine mammal Mercury bioaccumulation and cortisol interact to influence endocrine and immune biomarkers in a free-ranging marine mammal
Mercury bioaccumulation from deep-ocean prey and the extreme life history strategies of adult female northern elephant seals (Mirounga angustirostris) provide a unique system to assess the interactive effects of mercury and stress on animal health by quantifying blood biomarkers in relation to mercury (skeletal muscle and blood mercury) and cortisol concentrations. The thyroid hormone...
Authors
Sarah H. Peterson, Joshua T. Ackerman, Rachel R. Holser, Birgitte I. McDonald, Daniel P. Costa, Daniel E. Crocker
Evaluation of spectral collection strategies for identification of Dalbergia spp. using handheld laser-induced breakdown spectroscopy Evaluation of spectral collection strategies for identification of Dalbergia spp. using handheld laser-induced breakdown spectroscopy
The illegal timber trade has significant impact on the survival of endangered tropical hardwood species like Dalbergia spp. (rosewood), a world-wide protected genus from the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). Due to increased threat to Dalbergia spp., and lack of action to reduce threats, port of entry analysis methods are required to...
Authors
Caelin P. Celani, Rachel A McCormick, Amelia M Speed, William Johnston, James A. Jordan, Tyler B. Coplen, Karl S. Booksh
Rapid active thrust faulting at the northern Alaska Range front Rapid active thrust faulting at the northern Alaska Range front
Plate convergence rates strongly influence seismicity and mountain building inboard of convergent margins, but the distribution and kinematics of structures accommodating farfield convergence can be elusive. In interior Alaska, Yakutat microplate convergence drives late Pleistocene–recent right slip on the Denali fault, but westward-decreasing slip rates leave substantial residual...
Authors
Adrian Bender, Richard O. Lease, Tammy M. Rittenour, James V. Jones
A research agenda for the science of actionable knowledge: Drawing from a review of the most misguided to the most enlightened claims in the science-policy interface literature A research agenda for the science of actionable knowledge: Drawing from a review of the most misguided to the most enlightened claims in the science-policy interface literature
Linking science with action affords a prime opportunity to leverage greater societal impact from research and increase the use of evidence in decision-making. Success in these areas depends critically upon processes of producing and mobilizing knowledge, as well as supporting and making decisions. For decades, scholars have idealized and described these social processes in different ways
Authors
Kripa Jagannathan, Geniffer Emmanuel, James Arnott, Katharine Mach, Aparna Bamzai-Dodson, Kristen Goodrich, Ryan Meyer, Mark Neff, Dana Sjostrom, Kristin Timm, Esther Turnhout, Gabrielle Wong-Parodi, Angela Bednarek, Alison Meadow, Art Dewulf, Christine J. Kirchhoff, Richard C. Moss, Leah Nichols, Eliza Oldach, Maria Carmen Lemos, Nicole Klenk
Synthesizing professional opinion and published science to build a conceptual model of Walleye recruitment Synthesizing professional opinion and published science to build a conceptual model of Walleye recruitment
Understanding and predicting recruitment, longstanding goals in fisheries science and ecology, are complicated by variation in the importance of environmental drivers coupled with the dynamic nature of individual ecosystems. Developing an understanding of recruitment from well-monitored stocks offers an opportunity to overcome these complexities. We used a systematic literature review, a...
Authors
Corey Krabbenhoft, Stuart A. Ludsin, Elizabeth A. Marschall, Richard Budnik, Zoe Almeida, Chris Cahill, Holly Susan Embke, Zachary S. Feiner, Patrick J Schmalz, Matt Thorstensen, Michael Weber, Melissa R. Wuellner, Gretchen Hansen
60 years and beyond of Reviews of Geophysics 60 years and beyond of Reviews of Geophysics
Reviews of Geophysics is an AGU journal, first established in February 1963. It is a hybrid open access invitation-only journal that publishes comprehensive review articles across various disciplines within the Earth and Space Sciences. The selection criteria are rigorous and many submissions are declined without review. The journal is the highest ranked in the fields of Geochemistry and
Authors
Fabio Florindo, Valerio Acocella, Ann Marie Carlton, Paolo D’Odorico, Qingyun Duan, Andrew Gettelman, Jasper Halekas, Ruth A. Harris, Gesine Mollenhauer, Alan Robock, Claudine Stirling, Yusuke Yokoyama
Pandemic-driven changes in the nearshore non-commercial fishery in Hawai'i: Catch photos posted to social media capture changes in fisher behavior Pandemic-driven changes in the nearshore non-commercial fishery in Hawai'i: Catch photos posted to social media capture changes in fisher behavior
Using social media, we collect evidence for how nearshore fisheries are impacted by the global COVID-19 pandemic in Hawai’i. We later confirm our social media findings and obtain a more complete understanding of the changes in nearshore non-commercial fisheries in Hawai’i through a more conventional approach—speaking directly with fishers. Resource users posted photographs to social...
Authors
Timothy B. Grabowski, Michelle E. Benedum, Andrew Curley, Cole Dill-De, Michelle L. Shuey
Satellite remote sensing of river discharge: A framework for assessing the accuracy of discharge estimates made from satellite remote sensing observations Satellite remote sensing of river discharge: A framework for assessing the accuracy of discharge estimates made from satellite remote sensing observations
This research presents an evaluation of the accuracy and uncertainty of estimates of river discharge made using satellite observed data sources as input to a modified form of Manning’s equation. Conventional U.S. Geological Survey (USGS) streamflow gaging station data and in-situ measurements of width, depth, height, slope, discharge, and velocity from 30 USGS gage sites were used as...
Authors
David M. Bjerklie, Michael Durand, James M. LeNoir, Robert W. Dudley, Charon Birkett, John W. Jones, Merritt Elizabeth Harlan
Land cover differentially affects abundance of common and rare birds Land cover differentially affects abundance of common and rare birds
While rare species are vulnerable to global change, large declines in common species (i.e., those with large population sizes, large geographic distributions, and/or that are habitat generalists) also are of conservation concern. Understanding if and how commonness mediates species' responses to global change, including land cover change, can help guide conservation strategies. We...
Authors
Kristin P. Davis, Paul C. Banko, Liba Pejchar