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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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The smaller, the better? First evaluation of growth and mortality in crayfish internally tagged with p-Chips The smaller, the better? First evaluation of growth and mortality in crayfish internally tagged with p-Chips
Small-bodied aquatic animals present a challenge to researchers seeking to uniquely mark individuals for scientific study. Microtransponder tags, such as p-Chips, represent the smallest electronic animal tags available to meet this need. The use of p-Chips to tag freshwater crayfishes, however, has not been explored. The goal of this study, therefore, was to determine the effects of p...
Authors
Augusto F. Huber, Wesley A. Fitzsimmons, Jacob Thomas Westhoff
Glacial vicariance and secondary contact shape demographic histories in a freshwater mussel species complex Glacial vicariance and secondary contact shape demographic histories in a freshwater mussel species complex
Characterizing the mechanisms influencing the distribution of genetic variation in aquatic species can be difficult due to the dynamic nature of hydrological landscapes. In North America’s Central Highlands, a complex history of glacial dynamics, long-term isolation, and secondary contact have shaped genetic variation in aquatic species. Although the effects of glacial history have been
Authors
Nathan Johnson, Andrew R. Henderson, Jess W. Jones, Caitlin Beaver, Steve A. Ahlstedt, Gerald R. Dinkins, Nathan L. Eckert, Mark J. Endries, Jeffrey T. Garner, John L. Harris, Paul D. Hartfield, Don W. Hubbs, Timothy W. Lane, Monte A. McGregor, Kendall R. Moles, Cheryl L. Morrison, Matthew D. Wagner, James D. Williams, Chase H. Smith
Practical guide to measuring wetland carbon pools and fluxes Practical guide to measuring wetland carbon pools and fluxes
Wetlands cover a small portion of the world, but have disproportionate influence on global carbon (C) sequestration, carbon dioxide and methane emissions, and aquatic C fluxes. However, the underlying biogeochemical processes that affect wetland C pools and fluxes are complex and dynamic, making measurements of wetland C challenging. Over decades of research, many observational...
Authors
Sheel Bansal, Irena F. Creed, Brian Tangen, Scott D. Bridgham, Ankur R. Desai, Ken Krauss, Scott C Neubauer, Gregory E. Noe, Donald O. Rosenberry, Carl C. Trettin, Kimberly Wickland, Scott T. Allen, Ariane Arias-Ortiz, Anna R. Armitage, Dennis Baldocchi, Kakoli Banerjee, David Bastviken, Peter Berg, Matthew J. Bogard, Alex T. Chow, William H. Conner, Christopher Craft, Courtney Creamer, Tonya Delsontro, Jamie Duberstein, Meagan J. Eagle, M. Siobhan Fennessey, Sarah A. Finkelstein, Mathias Goeckede, Sabine Grunwald, Meghan Halibisky, Ellen R. Herbert, Mohammad Jahangir, Olivia Johnson, Miriam C. Jones, Jeffrey Kelleway, Sarah Knox, Kevin D. Kroeger, Kevin Kuehn, David Lobb, Amanda Loder, Shizhou Ma, Damien Maher, Gavin McNicol, Jacob Meier, Beth A. Middleton, Christopher T. Mills, Purbasha Mistry, Abhijith Mitra, Courtney Mobilian, Amanda M. Nahlik, Sue Newman, Jessica O’Connell, Patty Oikawa, Max Post van der Burg, Charles A Schutte, Chanchung Song, Camille L. Stagg, Jessica Turner, Rodrigo Vargas, Mark Waldrop, Markus Wallin, Zhaohui Aleck Wang, Eric Ward, Debra A. Willard, Stephanie A. Yarwood, Xiaoyan Zhu
By
Ecosystems Mission Area, Water Resources Mission Area, Ecosystems Land Change Science Program, Florence Bascom Geoscience Center, Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center, Northern Prairie Wildlife Research Center, Wetland and Aquatic Research Center , Woods Hole Coastal and Marine Science Center
Editorial: Remote sensing of volcanic gas emissions from the ground, air, and space Editorial: Remote sensing of volcanic gas emissions from the ground, air, and space
When magma rises in volcanic systems, volatile species exsolve from the melt and are outgassed to the atmosphere. The melt composition and temperature, depth at which degassing occurs, extent of gas-water-rock interactions, and volume of ascending magma are all factors that determine the composition and rate of gas emissions at the surface. Interpreted in a petrological framework, gas...
Authors
Christoph Kern, Santiago Arellano, Robin Campion, Silvana Hidalgo, Ryunosuke Kazahaya
At what scales does a river meander? Scale-specific sinuosity (S3) metric for quantifying stream meander size distribution At what scales does a river meander? Scale-specific sinuosity (S3) metric for quantifying stream meander size distribution
Stream bend geometry is linked to terrain features, hydrologic and ecologic conditions, and anthropogenic forces. Knowledge of the distributions of geometric properties of streams advances understanding of changing landscape conditions and associated processes that operate over a range of spatial scales. Statistical decomposition of sinuosity in natural linear features has proven a...
Authors
Larry Stanislawski, Barry J. Kronenfeld, Barbara P. Buttenfield, Ethan J. Shavers
Understanding the drivers of volcano deformation through geodetic model verification and validation Understanding the drivers of volcano deformation through geodetic model verification and validation
Volcano geodesy often involves the use of models to explain observed surface deformation. A variety of forward models are used, from analytical point sources to numerical simulations that consider complex magma system geometries, topography, and material properties. Various inversion methods can then be used to relate observed volcano data to models. Ideally, forward models should be...
Authors
Joshua Allen Crozier, Leif Karlstrom, Emily K. Montgomery-Brown, Mario Angarita, Valerie Cayol, Mary Grace Bato, Taiyi Wang, Ronni Grapenthin, Tara Shreve, Kyle R. Anderson, Ana Astort, Olivier Bodart, Flavio Cannavò, Gilda Currenti, Farshid Dabaghi, Brittany A. Erickson, Deepak Garg, Matthew Head, Adriana Iozzia, Young Cheol Kim, Hélène Le Mével, Camila Novoa Lizama, Cody Rucker, Francesca Silverii, Yan Zhan
Fire regime shapes butterfly communities through changes in nectar resources in an Australian tropical savanna Fire regime shapes butterfly communities through changes in nectar resources in an Australian tropical savanna
Fire-dependent savanna provides key habitat for butterflies globally, but we know little about how fire regimes, including fire frequency and season, affect them. These impacts are likely to be primarily indirect, through changes in overall habitat structure, the abundance of larval host plants, and/or the provision of nectar resources for adults. We examined the relationships among fire...
Authors
Julia B. Leone, Diane L. Larson, Anna E. Richards, Jon Schatz, Alan N. Andersen
An assessment of HgII to preserve carbonate system parameters in organic-rich estuarine waters An assessment of HgII to preserve carbonate system parameters in organic-rich estuarine waters
This work assesses the effectiveness of sample preservation techniques for measurements of pHT (total scale), total dissolved inorganic carbon (CT), and total alkalinity (AT) in organic-rich estuarine waters as well as the internal consistency of measurements and calculations (e.g., AT, pHT, and CT) in these waters. Using mercuric chloride (HgCl2)-treated and untreated water samples...
Authors
Christopher Moore, Robert H. Byrne, Kimberly Yates
U-Pb zircon ages and Lu-Hf isotope systematics across northwestern Mexico: Implications for Cretaceous to Paleocene tectonomagmatic evolution during Farallon subduction U-Pb zircon ages and Lu-Hf isotope systematics across northwestern Mexico: Implications for Cretaceous to Paleocene tectonomagmatic evolution during Farallon subduction
This study presents U-Pb zircon ages and Lu-Hf zircon isotope data for Cretaceous-Paleocene plutonic rocks along a W-E transect in northwestern Mexico. These data are combined with tectonic reconstruction that restores Late Cenozoic extensional deformation and shows the position of magmatism at 36 Ma. Zircon U-Pb ages results span from 142 to 58 Ma and demonstrate that the continental...
Authors
Arlin B. Fonseca-Martinez, Alexander Iriondo, Scott E.K. Bennett, Fred W. McDowell, Carlos Ortega-Obregon
Characterizing the movement of per- and polyfluoroalkyl substances in an avian aquatic–terrestrial food web Characterizing the movement of per- and polyfluoroalkyl substances in an avian aquatic–terrestrial food web
The movement of per- and polyfluoroalkyl substances (PFAS) through linked aquatic–terrestrial food webs is not well understood. Tree swallows (Tachycineta bicolor) in such systems may be exposed to PFAS from multiple abiotic and/or biotic compartments. We show from fatty acid signatures and carbon stable isotopes that tree swallow nestlings in southwestern Ontario fed on both terrestrial...
Authors
Kailee E. Hopkins, Melissa A. McKinney, Amandeep Saini, Robert J. Letcher, Natalie Karouna-Renier, Kim J. Fernie
Deer management generally reduces densities of nymphal Ixodes scapularis, but not prevalence of infection with Borrelia burgdorferi sensu stricto Deer management generally reduces densities of nymphal Ixodes scapularis, but not prevalence of infection with Borrelia burgdorferi sensu stricto
Human Lyme disease–primarily caused by the bacterium Borrelia burgdorferi sensu stricto (s.s.) in North America–is the most common vector-borne disease in the United States. Research on risk mitigation strategies during the last three decades has emphasized methods to reduce densities of the primary vector in eastern North America, the blacklegged tick (Ixodes scapularis). Controlling...
Authors
Alynn Martin, Danielle Buttke, Jordan Raphael, Kelsey Taylor, Sarah Maes, Christina M. Parise, Howard Ginsberg, Paul C. Cross
Multi-omic responses of fish exposed to complex chemical mixtures in the Shenandoah River watershed Multi-omic responses of fish exposed to complex chemical mixtures in the Shenandoah River watershed
To evaluate relationships between different anthropogenic impacts, contaminant occurrence, and fish health, we conducted in situ fish exposures across the Shenandoah River watershed at five sites with different land use. Exposure water was analyzed for over 500 chemical constituents, and organismal, metabolomic, and transcriptomic endpoints were measured in fathead minnows. Adverse...
Authors
David Bertolatus, Larry B. Barber, Christopher J. Martyniuk, Huajun Zhen, Timothy W. Collette, Drew R. Ekman, Aaron Jastrow, Jennifer Rapp, Alan M. Vajda