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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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Potential effects of climate change on Ambystoma barbouri (streamside salamander) Potential effects of climate change on Ambystoma barbouri (streamside salamander)
Ambystoma barbouri (streamside salamanders) are stream-breeding mole salamanders that rely on seasonally intermittent, fishless streams for egg and larval development but are primarily fossorial as adults. Climate-driven changes are likely to alter streamflow duration, peak, and seasonality within the range of A. barbouri, reducing reproductive habitat and larval survival. Although...
Authors
Marta P. Lyons, Olivia E. LeDee, Ryan P. Boyles
U.S. Geological Survey and Blackfeet Water Department Hydrologic Assessment of the Blackfeet Indian Reservation, Montana U.S. Geological Survey and Blackfeet Water Department Hydrologic Assessment of the Blackfeet Indian Reservation, Montana
The Blackfeet Nation seeks an increased scientific understanding of the water resources within the Blackfeet Indian Reservation of northwestern Montana. Hydrologic information is needed to better inform water-management decisions as the Blackfeet Nation implements the Blackfeet Water Rights Compact, initiates new water-use projects, and improves the Blackfeet Irrigation Project. The U.S...
Authors
Sean M. Lawlor, Rodney R. Caldwell, Timothy T. Bartos, Brett Price
Protocol for the reintroduction of California red-legged frogs to Santa Monica Mountains National Recreation Area Protocol for the reintroduction of California red-legged frogs to Santa Monica Mountains National Recreation Area
Once common and widespread in Southern California, California red-legged frogs (Rana draytonii) began declining sometime in the middle of the 20th century. They were listed as threatened under the Endangered Species Act in 1996. Three small and isolated populations remained in Los Angeles and Ventura Counties by the start of the 21st century. The nearest population of California red...
Authors
Kathleen Semple Delaney, Mark Mendelsohn, Sarah M. Wenner, Adam R. Backlin, Elizabeth Gallegos, Robert N. Fisher, Seth P.D. Riley
Appendix A: Modeling appendix for the Northwestern and Southwestern pond turtle (Actinemys marmorata , Actinemys pallida ) Appendix A: Modeling appendix for the Northwestern and Southwestern pond turtle (Actinemys marmorata , Actinemys pallida )
To predict future status of the northwestern pond turtle (Actinemys marmorata) and southwestern pond turtle (Actinemys pallida) species, we developed a stochastic stage-based matrix population model to simulate future population conditions. We constructed a demographic population viability analysis for each species based on a post-breeding, single sex, stage-based life history diagram...
Authors
Kaili M. Gregory, Conor P. McGowan
National preparedness strategy & action plan for potentially hazardous near-Earth objects and planetary defense National preparedness strategy & action plan for potentially hazardous near-Earth objects and planetary defense
Near-Earth Objects (NEOs) are asteroids and comets that orbit the Sun, but have orbits that can bring them into Earth’s neighborhood—within 30 million miles of Earth’s orbit. Planetary defense is “applied planetary science” to address the NEO impact risks on Earth. This National Preparedness Strategy and Action Plan for Near-Earth Objects and Planetary Defense (2023 Planetary Defense...
Authors
Matthew Daniels, Lindley Johnson, Renata Kommel, Patrick Besha, Perry Brody, Kevin Conole, Kelly Fast, Angelo Fernandez, Ralph Gaume, Kevin Greenaugh, Ryan Guglietta, Diane Howard, Grace Hu, Christine Joseph, Brig Gen Traci Keuker-Murphy, L.A. Lewis, Lindsay Millard, Joel Mozer, Dianne Poster, Timothy N. Titus, Ashley Vanderley
Status and trends of pelagic and benthic prey fish populations in Lake Michigan, 2022 Status and trends of pelagic and benthic prey fish populations in Lake Michigan, 2022
Fall bottom trawl (fall BT) and lakewide acoustic (AC) surveys are conducted annually to generate indices of pelagic and benthic prey fish densities in Lake Michigan. The fall BT survey has been conducted each fall since 1973 using 12-m trawls at depths ranging from 9 to 110 m at fixed locations distributed across seven transects; this survey estimates densities of seven prey fish...
Authors
Ralph W. Tingley, David Warner, Charles P. Madenjian, Patricia Dieter, Ben Turschak, Dale Hanson, Kristy Phillips, Caleb Geister