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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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We are focused on some of the most significant issues society faces, and our science is making a substantial contribution to the well-being of the Nation and the world. Learn more about the major topics our research covers and the programs focused on those topics.

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Filter Total Items: 175547

Distribution, abundance, and breeding activities of the Southwestern Willow Flycatcher at Marine Corps Base Camp Pendleton, California—2024 annual report Distribution, abundance, and breeding activities of the Southwestern Willow Flycatcher at Marine Corps Base Camp Pendleton, California—2024 annual report

Executive Summary The purpose of this report is to provide the Marine Corps with an annual summary of the distribution, abundance, and breeding activity of the endangered Southwestern Willow Flycatcher (Empidonax traillii extimus; flycatcher) at Marine Corps Base Camp Pendleton (MCBCP or “Base”). Surveys for the flycatcher were conducted on Base between May 8 and July 24, 2024. All of...
Authors
Scarlett L. Howell, Barbara E. Kus
By
Ecosystems Mission Area, Western Ecological Research Center (WERC)

Expanding barriers: Impassable gaps interior to distribution of an isolated mountain-dwelling species Expanding barriers: Impassable gaps interior to distribution of an isolated mountain-dwelling species

Global change is expected to expand and shrink species' distributions in complex ways beyond just retraction at warm edges and expansion at cool ones. Detecting these changes is complicated by the need for robust baseline data for comparison. For instance, gaps in species' distributions may reflect long-standing patterns, recent shifts, or merely insufficient sampling effort. We...
Authors
Erik A. Beever, Adam B. Smith, David H. Wright, Tom Rickman, Francis D. Gerraty, Joseph A.E. Stewart, Alisha M. Gill, Kelly Klingler, Megan M. Robinson
By
Ecosystems Mission Area, Northern Rocky Mountain Science Center

Status and trends of forest bird populations at Hakalau Forest National Wildlife Refuge, 1987–2024 Status and trends of forest bird populations at Hakalau Forest National Wildlife Refuge, 1987–2024

Since 1985, the Hakalau Forest Unit of the Big Island National Wildlife Refuge Complex (hereafter, Hakalau) has protected the largest endemic forest bird diversity in the State of Hawaii. This includes three endangered and one threatened species and their habitats. Hakalau’s vast area (155 km2), mostly high elevation (>1500 m) montane forest, provides refuge from avian malaria...
Authors
Noah Hunt, Steve Kendall, Trevor Bak, Richard J. Camp
By
Ecosystems Mission Area, Pacific Island Ecosystems Research Center

Application of mercury stable isotopes to examine sources and hydrologic factors impacting mercury bioaccumulation and cycling in invertebrates of a model saline lake Application of mercury stable isotopes to examine sources and hydrologic factors impacting mercury bioaccumulation and cycling in invertebrates of a model saline lake

Invertebrates, such as brine shrimp and brine flies, are key prey items for millions of resident and migratory birds that utilize saline lakes such as Great Salt Lake (GSL). Elevated methylmercury (MeHg) in invertebrate and waterfowl species of GSL has been assumed to be linked to elevated MeHg in GSL’s anoxic Deep Brine Layer (DBL) where aqueous concentrations can exceed 30 ng/L. Here...
Authors
Samuel Francisco Lopez, Sarah E. Janssen, Michael T. Tate, Frank J. Black, Hannah Erin Mcilwain, Laura Elizabeth Flucke, Jacob M. Ogorek, William P. Johnson
By
Utah Water Science Center, M3 Research Laboratory

Challenges and priorities for climate-informed invasive species management across multiple scales Challenges and priorities for climate-informed invasive species management across multiple scales

In recent decades, substantial evidence has accumulated regarding the effects of climate change on the establishment, spread, and impact of invasive species. While the importance of incorporating climate change into invasive species management and policy is increasingly recognized, practitioner experiences and perspectives are often overlooked. Consequently, invasive species research may...
Authors
A.E. Evans, L. Brewington, Carrie Jean Brown-Lima, E. Fusco, R.M. Gregg, D. Lieurance, Elliott W. Parsons, R.C. Nagy, Lindsey Thurman, Toni Lyn Morelli
By
Ecosystems Mission Area, Climate Adaptation Science Centers

Concentration dependency of PFOS bioaccumulation by freshwater benthic algae Concentration dependency of PFOS bioaccumulation by freshwater benthic algae

Although perfluorooctanesulfonic acid (PFOS) has been voluntarily phased out, it remains the most abundant and frequently detected PFAS compound in biota worldwide. A deeper understanding of how PFOS enters the aquatic food web at the energetic base is needed to better characterize and predict the general patterns of PFAS trophic transfer. Research on bioaccumulation by primary producers...
Authors
Alison M. Zachritz, Jeffery A. Steevens, Daniele A. Miranda, Brittany G. Perrotta, Rebecca A. Dorman, Heather D. Whitehead, Erin L. Pulster, David Walters, David J. Soucek, Graham F. Peaslee, Gary A. Lamberti
By
Ecosystems Mission Area, Columbia Environmental Research Center
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