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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 fipronil bait pellets on two cricetid species: Potential implications for plague mitigation and wildlife conservation Effects of fipronil bait pellets on two cricetid species: Potential implications for plague mitigation and wildlife conservation
We evaluated the effects of fipronil bait pellets on two cricetids that commonly occupy colonies of black-tailed prairie dogs (Cynomys ludovicianus; BTPDs): western deer mice (Peromyscus sonoriensis) and northern grasshopper mice (Onychomys leucogaster). In one experiment, bait pellets (0.96 mg fipronil/bait) were applied at 75 baits/ha to three 1.44-ha plots on a BTPD colony. Mouse...
Authors
David A. Eads, Marc R. Matchett, Travis M. Livieri, Richard A. Bowen, Airn E. Hartwig, Stephanie Porter, Mary L. Wright, Jason Fly, Madisen Hartlaub, Phillip Dobesh, Paul Roghair, Eddie Childers, John P. Hughes, Michelle L. Hladik, Gregory P. Dooley, Brian J. Smith, Rachel A. LaCasse, Kristy Bly, Dean E. Biggins
Indicators of mercury concentration in Lake Trout: Can fish location and appearance provide information to anglers to reduce their exposure? Indicators of mercury concentration in Lake Trout: Can fish location and appearance provide information to anglers to reduce their exposure?
Objective People are exposed to mercury (Hg) through the consumption of fish. State and federal governments provide broad, often-generalized food safety guidance to reduce exposure; however, numerous rural fishing areas lack testing and location- or species-specific guidance. The aim of this study was to provide tangible, visible, or easily measured characteristics of Lake Trout...
Authors
Sarah M. Laske, Daniel Young, Krista K. Bartz, Vanessa R. von Biela, Michael P. Carey
Ecology of reintroduced Rocky Mountain bighorn sheep in Dinosaur National Monument Ecology of reintroduced Rocky Mountain bighorn sheep in Dinosaur National Monument
Translocations have been widely used to restore and conserve bighorn sheep (Ovis canadensis) populations in North America. Some translocations have been successful, but many populations remain small and genetically isolated. Population structure can influence the viability and long-term success of reintroductions. Social ungulates often function as interconnected subpopulations...
Authors
Sarah Louise Carroll, Elizabeth P Flesch, Salix Scoresby, Emily Spencer, Rachel S. Crowhurst, Clinton W. Epps, Nathan L. Galloway, William Michael Janousek, Tabitha A. Graves
Modeling the seasonality of wind-driven hydrocarbon waves in Titan’s polar lakes Modeling the seasonality of wind-driven hydrocarbon waves in Titan’s polar lakes
Titan, the only body in the solar system aside from Earth with standing liquids on its surface, has polar hydrocarbon lakes and seas. As Titan’s atmosphere generates light winds, there should be waves on the surface of these lakes and seas, yet, direct wave observations are scant. We introduce and use PlanetWaves, an open source 4D spectral wave model, to study Titan’s waves and create...
Authors
Charlene E. Detelich, Una G. Schneck, Alexander G. Hayes, Milan Curcic, Rose Elizabeth Palermo, Andrew D. Ashton, J. Taylor Perron, Juan M. Lora, Jordan Steckloff
Interacting effects of human presence and landscape modification on birds and mammals Interacting effects of human presence and landscape modification on birds and mammals
Sustainable human–wildlife coexistence requires a mechanistic understanding of the many ways that humans affect animals. However, progress is hampered by the lack of accessible data measuring the dynamic presence of people. Here, we leverage mobile-device data to disentangle how human presence and landscape modification differentially influence the use of geographic and environmental...
Authors
Ruth Y. Oliver, Scott W. Yanco, Diego Ellis-Soto, Brett R. Jesmer, Juliet Cohen, Song Gao, Robert Patchett, Tal Avgar, Keith L. Bildstein, Nicholas W. Bakner, David Barber, Kristin J. Barker, Joseph G. Barnes, Guillaume Bastille-Rousseau, Jerrold L. Belant, John F. Benson, Joel Bety, Dean E. Beyer, David Bird, Nathaniel R. Bowersock, Andy J. Boyce, Ben S. Carlson, Michael L. Casazza, Michael J. Chamberlain, Michael J. Cherry, Bret A. Collier, Alyson Courtemanch, Sarah C. Davidson, Darren DeBloois, Vickie DeNicola, Christopher R. Desorbo, Robert C. Dowler, Daniel Dupont, L. Mark Elbroch, John E. Elliott, Betsy A. Evans, W. Mark Ford, David Hancock, Molly Hardesty-Moore, Jason E. Hawley, Mackenzie R. Jeffress, Scott Jennings, Matthew J. Kauffman, Roland Kays, Marcella J. Kelly, Bryan M. Kluever, Myles Lamont, Scott LaPoint, Tayler N. Lasharr, Josee Lefebvre, Pierre Legagneux, Matthias-Claudio Loretto, David Lumpkin, Lindsay A. Martinez, John M. Marzluff, Douglas J. McCauley, Fiona McDuie, Tony W. Mong, Kevin L. Monteith, Thomas Mueller, Levi Newediuk, Anna C. Ortega, Federico Ossi, Cory T. Overton, J. Clint Perkins, Tyler R. Petroelje, Laura R. Prugh, Kimberly A. Sager-Fradkin, Michael Seer, Avery L. Shawler, Shannon Skalos, Rachel A. Smiley, Julia Sommerfield, Daniel R. Stahler, John A. Stephenson, Richard D. Stevens, Nathan J. Svoboda, Jean-Francois Therrien, Philippe J. Thomas, Meredith C. VanAcker, Eric Vander Wal, Dan E. Varland, Tana L. Verzuh, Brittany L. Wagler, Nils Warnock, Stephen L. Webb, Christopher K. Williams, Christopher C. Wilmers, David W. Wolfson, Julie K. Young, Christian Rutz, Walter Jetz
Consolidation and permeability of the B1 and D1 gas hydrate bearing sands and associated seal sediments of the extended-duration gas production test site on the Alaska North Slope Consolidation and permeability of the B1 and D1 gas hydrate bearing sands and associated seal sediments of the extended-duration gas production test site on the Alaska North Slope
Gas hydrate, a solid combination of gas (mostly methane in nature) and water molecules stable at low temperatures and elevated pressures, occurs naturally in marine and permafrost-associated environments. Gas hydrate reservoirs, such as those in the Alaska North Slope, have been considered potential energy resources for gas production. To understand the petrophysical and geo-mechanical
Authors
Imgenur Tepecik, Yongkoo Seol, William F. Waite, Sheng C. Dai
Advancing ecosystem recovery with diverse species plantings in tropical forest restoration Advancing ecosystem recovery with diverse species plantings in tropical forest restoration
Tropical forest restoration has increased in the past decades, with possible advancements given the UN declaration of the “Decade of Ecosystem Restoration”. However, robust assessments to compare ecosystem functions among restored forest stages are essential. We evaluated 13 actively restored forest stands ranging from 3 to 21 years of age and compared measures of forest biodiversity...
Authors
Debra A Hamilton, Victorino Molina Rojas, Therese M. Donovan
Patterns of recent brook trout invasion in bull trout streams in relation to habitat, source connectivity, biotic resistance, and disturbance Patterns of recent brook trout invasion in bull trout streams in relation to habitat, source connectivity, biotic resistance, and disturbance
Knowledge of which habitats are at risk of invasion by nonnative species is essential to conservation, but a changing climate often complicates assessments of where future invasions may occur. Nonnative brook trout Salvelinus fontinalis threaten cold-adapted native salmonids throughout western North America, and the extent of future invasions in coldwater streams is recognized as an area...
Authors
Nicholas S. Voss, Brett J. Bowersox, Daniel C. Nolfi, Michael C. Quist
A novel method for quantifying streambed penetrability to inform benthic habitat assessment A novel method for quantifying streambed penetrability to inform benthic habitat assessment
Objective Penetrability of streambed sediments is important for the ecological functioning of many benthic organisms, yet there is ambiguity in terminology associated with this concept and there is no standardized method of penetrability measurement available to scientists and resource managers. The goal of our study was to better define the terms of compaction and penetrability as they...
Authors
Jacob Thomas Westhoff, Kiah D. Wright, Lyndsie Wszola
Rebuttal to correspondence on “Examining the compositional selectivity of hydrocarbon oxidation products using liquid–liquid extraction and solid-phase extraction techniques” Rebuttal to correspondence on “Examining the compositional selectivity of hydrocarbon oxidation products using liquid–liquid extraction and solid-phase extraction techniques”
No abstract available.
Authors
David C. Podgorski, Barbara Bekins, Phoebe Zito
Beyond barriers: Fish assemblage recovery following dam removal on the Cuyahoga River, a Lake Erie tributary Beyond barriers: Fish assemblage recovery following dam removal on the Cuyahoga River, a Lake Erie tributary
Dam removals are increasing globally, yet ecological outcomes vary widely because biological recovery depends on post-removal connectivity and access to source populations. We evaluated how multiple dam removals and remaining fragmentation influenced fish assemblage recovery in the Cuyahoga River (OH, United States), a historically polluted Great Lakes tributary now undergoing extensive
Authors
Matthew Ross Acre, Sophia Marie Bonjour, Nicholas David Fischer, Andrew T. Mueller, James J. Roberts, Ryan J. Trimbath, Curt P. Wagner, Ramsey A.S. Langford, Eric R. Waits, Daniel J. Sullivan, John T. Belcik, Alexander V. Catalano, Nicholas A. Barkowski, Marc A. Mills, David M. Walters
Patterns of recent brook trout invasion in bull trout streams in relation to habitat, source connectivity, biotic resistance, and disturbance Patterns of recent brook trout invasion in bull trout streams in relation to habitat, source connectivity, biotic resistance, and disturbance
Anticipating biological invasions by nonnative species is critical to effective conservation. Nonnative brook trout Salvelinus fontinalis represents one of the most widespread threats to native bull trout Salvelinus confluentus, but the factors allowing or preventing ongoing range expansions are poorly understood. We addressed this uncertainty by resampling 221 survey locations in bull...
Authors
Nicholas S. Voss, Brett J. Bowersox, Daniel C. Nolfi, Michael C. Quist