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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 82,000 reports 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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Assessment of the sensitivity of Percina caprodes (logperch) to the pesticide 4-nitro-3-(trifluoromethyl)phenol Assessment of the sensitivity of Percina caprodes (logperch) to the pesticide 4-nitro-3-(trifluoromethyl)phenol
A continuous-flow streamside toxicity test was completed to evaluate the risk posed by the use of 4-nitro-3-(trifluoromethyl)phenol (TFM), used to control Petromyzon marinus (sea lamprey), to Percina caprodes (logperch). Logperch are a host fish to the parasitic glochidia life stage of the federally endangered Epioblasma triquetra (snuffbox mussel). Streams with an extant population of...
Authors
Courtney A. Kirkeeng, James A. Luoma, Nicholas Schloesser, Justin R. Schueller, Cheryl Kaye
Lidar estimation of storage capacity for managed water resources used by Desert Bighorn Sheep (Ovis canadensis mexicana) at Cabeza Prieta National Wildlife Refuge, Arizona Lidar estimation of storage capacity for managed water resources used by Desert Bighorn Sheep (Ovis canadensis mexicana) at Cabeza Prieta National Wildlife Refuge, Arizona
In cooperation with the U.S. Fish and Wildlife Service, the U.S. Geological Survey Southwest Biological Science Center employed ground-based light detection and ranging (lidar) during February 2022 to help meet two resource management objectives at the Cabeza Prieta National Wildlife Refuge (CPNWR), Arizona. The two objectives are (1) characterize the water storage capacity for one...
Authors
Joel B. Sankey, Joshua Caster, Nathaniel Bransky, Stephanie Fuest, Steven Sesnie, Ashton Bedford
Rappahannock tributary summary: A summary of trends in tidal water quality and associated factors, 1985-2022 Rappahannock tributary summary: A summary of trends in tidal water quality and associated factors, 1985-2022
The Rappahannock Tributary Summary outlines change over time for a suite of monitored tidal water quality parameters and associated potential drivers of those trends for the period of 1985 to 2022, and provides a brief description of the current state of knowledge explaining these observed changes. Water quality parameters described include surface (above pycnocline) total nitrogen (TN)...
Authors
Breck Maura Sullivan, Kaylyn Gootman, Alex Gunnerson, Sarah Betts, Cindy Johnson, Christopher A. Mason, Elgin Perry, Gopal Bhatt, Jennifer L. Keisman, James S. Webber, Jon Harcum, Michael F. Lane, Olivia Devereux, Qian Zhang, Rebecca Murphy, Renee Karrh, Thomas Butler, Vanessa Van Note, Angie Wei
Distributed volcanism—Characteristics, processes, and hazards Distributed volcanism—Characteristics, processes, and hazards
Introduction Distributed volcanism is defined by regions of dominantly, but not exclusively, monogenetic eruptive vents that are commonly mafic. Volcanic eruptions within distributed fields can range in composition from basalt to rhyolite and produce all types of volcanoes in all tectonic environments. This diversity in eruption composition and style reflects complex and varied magma...
Temporal, spatial, and chemical evolution of Quaternary high-silica rhyolites in the Mineral Mountains, Utah Temporal, spatial, and chemical evolution of Quaternary high-silica rhyolites in the Mineral Mountains, Utah
The Mineral Mountains in southwestern Utah are a structurally controlled core complex at the confluence of the Colorado Plateau and the Basin and Range physiographic provinces. Aside from hosting Utah’s largest batholith, the Mineral Mountains host some of the State’s youngest high-silica rhyolites, which have been linked to a magma source that is presently being utilized as an enhanced...
Authors
Tiffany A. Rivera, Brian R. Jicha, Stefan Kirby, Hannah B. Peacock
Predation of Lost River and Shortnose suckers by piscivorous colonial waterbirds in the Upper Klamath Basin: An analysis of predation effects during 2021–2023 Predation of Lost River and Shortnose suckers by piscivorous colonial waterbirds in the Upper Klamath Basin: An analysis of predation effects during 2021–2023
Previously published research indicated that predation by piscivorous colonial waterbirds in the Upper Klamath Basin was a source of mortality for Lost River suckers (Deltistes luxatus) and Shortnose suckers (Chasmistes brevirostris), including mortality of Sucker Assisted Rearing Program (SARP) fish. Avian predation on recently released Chinook Salmon (Oncorhynchus tshawytscha) in the...
Authors
Nathan B Banet, Quinn Payton, Allen Evans, Rachael Katelyn Paul-Wilson, Jacob Richard Krause, Brian S. Hayes, Erin Marie Benham