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Browse more than 160,000 publications authored by our scientists over the past 100+ year history of the USGS.  Publications available are: USGS-authored journal articles, series reports, book chapters, other government publications, and more.

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Filter Total Items: 175531

Groundwater age estimates for the Mississippi River Valley alluvial aquifer based on tracer data collected during 2018–20 Groundwater age estimates for the Mississippi River Valley alluvial aquifer based on tracer data collected during 2018–20

This study characterized groundwater age across the Mississippi River Valley alluvial aquifer (MRVA). Groundwater samples from 69 MRVA wells and 19 wells in Tertiary units of the Mississippi embayment aquifer system (MEAS) were analyzed for sulfur hexafluoride (SF6), tritium (3H), helium (He), and (or) carbon-14 of dissolved inorganic carbon (14C). The age distributions of 89 samples...
Authors
Michael C. Gratzer, John E. Solder, Katherine J. Knierim, James A. Kingsbury, Andrew M. O’Reilly, Gregg R. Davidson
By
Lower Mississippi-Gulf Water Science Center

Spatial close-kin mark-recapture models applied to terrestrial species with continuous natal dispersal Spatial close-kin mark-recapture models applied to terrestrial species with continuous natal dispersal

Close-kin mark–recapture (CKMR) methods use information on genetic relatedness among individuals to estimate demographic parameters. An individual's genotype can be considered a ‘recapture’ of each of its parent's genotype, and the frequency of kin-pair matches detected in a population sample can directly inform estimates of abundance. CKMR inference procedures require analysts to define...
Authors
Anthony Seveque, Robert Charles Lonsinger, Lisette P. Waits, Dana J. Morin
By
Cooperative Research Units

What is eDNA method standardization and why do we need it? What is eDNA method standardization and why do we need it?

The rapid advancement of environmental DNA (eDNA) science in the past two decades has inspired a concomitant growth in the development of eDNA sampling and analytical methods. However, these methods are often developed by individual laboratories or institutions, which can isolate protocols within programmes, agencies or regions and prevent the beneficial exchange of data and ideas...
Authors
Susanna Theroux, Adam Sepulveda, Cathryn L. Abbott, Zachary Gold, Alison W. Watts, Margaret Hunter, Katy E. Klymus, Shana L. Hirsch, Joseph M. Craine, Devin Nicole Jones-Slobodian, Rachel J. Brown, Joshua A. Steele, Miwa Takahashi, Rachel T. Noble, John A. Darling
By
Ecosystems Mission Area, Columbia Environmental Research Center, Northern Rocky Mountain Science Center, Wetland and Aquatic Research Center

The communication of volcano information in New Zealand - A narrative review The communication of volcano information in New Zealand - A narrative review

Communication of volcano information is critical for effective volcanic risk management. A variety of information is communicated to inform decisions and guide actions for planning, preparedness, and response. Such information needs to be reliable, and fit-for-purpose across different stages of volcanic activity (quiescence, unrest, short or long-term eruptive stages, and the post...
Authors
Manomita Das, Julia S. Becker, Emma Hudson Doyle, Danielle Charlton, Mary Ann T. Clive, Janine Krippner, Lauren Vinnell, Craig A. Miller, Carol Stewart, Hollei Gabrielsen, Sally H. Potter, Graham Leonard, David M. Johnston, Kelvin Tapuke, Nico Fournier, Sara K. McBride
By
Geologic Hazards Science Center

Local, regional, and distal recordings of seismic unrest at Tau Island volcano, American Samoa Local, regional, and distal recordings of seismic unrest at Tau Island volcano, American Samoa

A seismic swarm near Taʻū Island, a volcanic island in eastern American Samoa, occurred from July to October 2022. The earliest unrest was noted as felt shaking reports in late July, and instrumentation varied in the beginning of the sequence as the U.S. Geological Survey (USGS) Hawaiian Volcano Observatory responded by installing temporary and then permanent seismometers to monitor the...
Authors
Aaron Wech, Matthew M. Haney, Jefferson Chang, A.D. Jolly, Clara Yoon, Robert J. Skoumal
By
Volcano Hazards Program, Volcano Science Center

New distributional record of the federally threatened Rabbitsfoot Mussel (Theliderma cylindrica) in Oklahoma New distributional record of the federally threatened Rabbitsfoot Mussel (Theliderma cylindrica) in Oklahoma

Sampling conducted from May to August of 2024 yielded new distributional records for the federally threatened Theliderma cylindrica (Rabbitsfoot) in the Caney River, OK. We found 4 live individuals, representing at least 2 age classes, ∼7 km upstream of the confluence with the Verdigris River. This report is the first documentation of live Rabbitsfoot in the Caney River, where the...
Authors
Hunter M. Torolski, James M. Long, Robert Charles Lonsinger, Lindsey A. Bruckerhoff
By
Cooperative Research Units
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