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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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Southwestern Willow Flycatcher (Empidonax traillii extimus) surveys at the city of Carlsbad Preserve, San Diego County, California—2025 data summary Southwestern Willow Flycatcher (Empidonax traillii extimus) surveys at the city of Carlsbad Preserve, San Diego County, California—2025 data summary

Executive Summary We surveyed for Southwestern Willow Flycatchers (Empidonax traillii extimus; flycatcher) at five survey areas within the City of Carlsbad Preserve, Carlsbad, California, in 2025. Three flycatcher surveys were completed between May 16 and June 30, 2025. One transient flycatcher was observed at the Lake Calavera survey area in the City of Carlsbad Preserve in 2025.
Authors
Lisa D. Allen, Barbara E. Kus
By
Ecosystems Mission Area, Western Ecological Research Center (WERC)

Distribution and abundance of Least Bell’s Vireos (Vireo bellii pusillus), Southwestern Willow Flycatchers (Empidonax traillii extimus), and Coastal California Gnatcatchers (Polioptila californica californica) at the Carbon Canyon Dam Distribution and abundance of Least Bell’s Vireos (Vireo bellii pusillus), Southwestern Willow Flycatchers (Empidonax traillii extimus), and Coastal California Gnatcatchers (Polioptila californica californica) at the Carbon Canyon Dam

Executive Summary We surveyed for Least Bell’s Vireos (Vireo bellii pusillus; vireo), Southwestern Willow Flycatchers (Empidonax traillii extimus; flycatcher), and Coastal California Gnatcatchers (Polioptila californica californica; gnatcatcher) at the Carbon Canyon Dam study area near Brea, California, in 2025. Four gnatcatcher and vireo surveys were completed between April 22 and June...
Authors
Scarlett L. Howell, Barbara E. Kus
By
Ecosystems Mission Area, Western Ecological Research Center (WERC)

Bottom-up characterization of geologic methane emissions in the San Juan Basin in the southwestern USA Bottom-up characterization of geologic methane emissions in the San Juan Basin in the southwestern USA

Methane is a potent greenhouse gas that plays an important role in atmospheric chemistry and global warming. The current global methane budget has large uncertainties, and a better understanding of the budget would help to guide strategies for reducing anthropogenic emissions to fight climate change. Natural geologic methane emissions are a particularly poorly constrained source, with...
Authors
Margaret Scholer, Kathleen R. Hall, Thomas S. Weber, Marc L. Buursink, Mingzhe Zhu, Alexander C. Ihle, Devin Hencmann, Andrew M. Smith, Katey W. Anthony, Vasilii V. Petrenko
By
Geology, Energy, and Minerals Mission Area, Energy Resources Program, Geology, Energy & Minerals Science Center

Constraining source and path effects of large magnitude earthquakes using ground motion simulations Constraining source and path effects of large magnitude earthquakes using ground motion simulations

The purpose of this study is to use ground‐motion simulations to investigate ways in which source and path effects for large‐magnitude earthquakes can be represented in nonergodic ground‐motion models (GMMs). To achieve this, we designed a ground‐motion study in the San Francisco Bay Area that includes earthquakes with a broad range of magnitudes distributed uniformly on a fault plane...
Authors
Xiaofeng Meng, Robert Graves, Christine A Goulet
By
Natural Hazards Mission Area, Earthquake Hazards Program, Earthquake Science Center

Field performance evaluation of a bayluscide 20-percent suspension concentrate formulation Field performance evaluation of a bayluscide 20-percent suspension concentrate formulation

Petromyzon marinus (sea lamprey) is a parasitic, invasive fish of the Laurentian Great Lakes. Since the late 1950s, the Great Lakes Fishery Commission has implemented an integrated Sea Lamprey Control Program (SLCP) that relies on two lampricidal chemicals: 3-(trifluoromethyl)-4-nitrophenol (TFM) and niclosamide. Niclosamide is applied using a bayluscide 20-percent emulsifiable...
Authors
Nadia Carmosini, Justin R. Schueller, Courtney A. Kirkeeng, Anne M. Wood, Lori A. Criger, James A. Luoma
By
Ecosystems Mission Area, Upper Midwest Environmental Sciences Center

Organic and isotopic indicators for sorting of sedimentary organic matter along a marginal submarine canyon Organic and isotopic indicators for sorting of sedimentary organic matter along a marginal submarine canyon

Submarine canyons are incised features of many continental margins that can have significant influence on the hydrodynamic distribution of sediments and organic matter eroded and deposited from the continents. Baltimore Canyon, on the mid-Atlantic margin of the United States, contains a complex set of sedimentary processes that simultaneously create unique benthic habitats and control...
Authors
Hilary G. Close, Matthew G. McCarthy, Nancy G. Prouty
By
Pacific Coastal and Marine Science Center
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