Publications
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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Klamath natural flow study, Upper Klamath Basin groundwater flow model Klamath natural flow study, Upper Klamath Basin groundwater flow model
The purpose of the Upper Klamath Basin Groundwater Flow Model (UKBGFM) is to simulate groundwater conditions in the Upper Klamath Basin under historical and predevelopment conditions. The UKBGFM quantifies estimates of and changes in groundwater levels, storage, pumping, drainage flow to tile drains, evapotranspiration, and flow between the Upper Klamath Basin and neighboring basins. The
Authors
Jonathan A. Traum, Scott E. Boyce
Spatial extent of seagrasses (Zostera marina and Ruppia maritima) along the central Pacific coast of Baja California, Mexico, 1999–2000 Spatial extent of seagrasses (Zostera marina and Ruppia maritima) along the central Pacific coast of Baja California, Mexico, 1999–2000
The seagrasses eelgrass (Zostera marina) and widgeongrass (Ruppia maritima) are prominent features of coastal lagoons along the Pacific coast of Baja California, Mexico, supporting a rich diversity of marine life. Yet little is known about their spatial distribution in this region. This is a concern because of declining trends in the abundance and distribution of seagrass in parts of...
Authors
David H. Ward, Alexandra Morton, Carl J. Markon, Kyle R. Hogrefe
Plant community trajectories following livestock exclusion for conservation vary and hinge on initial invasion and soil-biocrust conditions in shrub steppe Plant community trajectories following livestock exclusion for conservation vary and hinge on initial invasion and soil-biocrust conditions in shrub steppe
Adjustments or complete withdrawal of livestock grazing are among the most common conservation actions in semiarid uplands, but outcomes can vary considerably with ecological context. Invasion by exotic annual grasses and the excessive wildfire they promote are increasing threats to semiarid shrub-steppe, and plant-community response to livestock exclusion in these areas may be...
Authors
Matthew J. Germino, Chad Raymond Kluender, Christopher R. Anthony
Abundance of eelgrass (Zostera marina) at key Black Brant (Branta bernicla nigricans) wintering sites along the northern Pacific coast of Baja California, Mexico, 1998–2012 Abundance of eelgrass (Zostera marina) at key Black Brant (Branta bernicla nigricans) wintering sites along the northern Pacific coast of Baja California, Mexico, 1998–2012
Trends in the abundance and distribution of eelgrass (Zostera marina), the primary winter forage of black brant (Branta bernicla nigricans), was evaluated at three major wintering sites for black brant along the northern Pacific coast of Baja California, Mexico. This region of northwestern Mexico contains significant beds of eelgrass that were showing signs of decline, which may...
Authors
David H. Ward
Sentinel responses of Arctic freshwater systems to climate: linkages, evidence, and a roadmap for future research Sentinel responses of Arctic freshwater systems to climate: linkages, evidence, and a roadmap for future research
While the sentinel nature of freshwater systems is now well recognized, widespread integration of freshwater processes and patterns into our understanding of broader climate-driven Arctic terrestrial ecosystem change has been slow. We review the current understanding across Arctic freshwater systems of key sentinel responses to climate, which are attributes of these systems with...
Authors
Jasmine E. Saros, Christoper D. Arp, Frederic Bouchard, Jerome Comte, Raoul-Marie Couture, Joshua F. Dean, Melissa Lafreniere, Sally MacIntyre, Suzanne McGowan, Milla Rautio, Clay Prater, Suzanne E. Tank, Michelle A. Walvoord, Kimberly Wickland, Dermot Antoniades, Paola Ayala-Borda, Joao Canario, Travis W. Drake, Diogo Folhas, Vaclava Hazukova, Henriikka Kivila, Yohanna Klanten, Scott Lamoreux, Isabelle Laurion, Rachel M. Pilla, Jorien E. Vonk, Scott Zolkos, Warwick Vincent
Genetic analysis of North American Phragmites australis guides management approaches Genetic analysis of North American Phragmites australis guides management approaches
Phragmites australis subsp. australis is an invasive and ecologically detrimental plant in multiple regions of North America. Its co-occurrence with the native subspecies, and multiple instances of hybridization, has created the need to differentiate Phragmites subspecies or haplotypes so that management can be appropriately targeted to the invader. We compiled a review of current...
Authors
Denise L. Lindsay, Joanna Freeland, Ping Gong, Xin Guan, Nathan E Harms, Kurt P. Kowalski, Richard F. Lance, Dong-Ha Oh, Bradley T Sartain, Douglas L Wendell
The hydroclimate niche: A tool for predicting and managing riparian plant community responses to streamflow seasonality The hydroclimate niche: A tool for predicting and managing riparian plant community responses to streamflow seasonality
Habitat suitability is a consequence of interacting environmental factors. In riparian ecosystems, suitable plant habitat is influenced by interactions between stream hydrology and climate, hereafter referred to as “hydroclimate”. We tested the hypothesis that hydroclimate variables would improve the fit of ecological niche models for a suite of riparian species using occurrence data...
Authors
Bradley J. Butterfield, Emily C. Palmquist, Charles B. Yackulic
Bulk and intramolecular carbon isotopic compositions of hydrocarbon gases from laboratory pyrolysis of oil shale of the Green River Formation: Implications for isotope structures of kerogens Bulk and intramolecular carbon isotopic compositions of hydrocarbon gases from laboratory pyrolysis of oil shale of the Green River Formation: Implications for isotope structures of kerogens
Evaluation of intramolecular isotope distributions within organic compounds can provide important insights into gas formation processes and structural properties of gas-generating precursors, such as kerogen, bitumen, and oil, in natural reservoirs. Until recently, little has been known about the intramolecular isotope distributions within kerogens. In this study, we conducted systematic...
Authors
Xiaoqiang Li, Justin E. Birdwell, Juske Horita
Predicted uranium and radon concentrations in New Hampshire (USA) groundwater—Using Multi Order Hydrologic Position as predictors Predicted uranium and radon concentrations in New Hampshire (USA) groundwater—Using Multi Order Hydrologic Position as predictors
Two radioactive elements, uranium (U) and radon (Rn), which are of potential concern in New Hampshire (NH) groundwater, are investigated. Exceedance probability maps are tools to highlight locations where the concentrations of undesirable substances in the groundwater may be elevated. Two forms of statistical analysis are used to create exceedance probability maps for U and Rn in NH...
Authors
Richard B. Moore, Kenneth Belitz, Joseph D. Ayotte, Terri L. Arnold, Laura Hayes, Jennifer B. Sharpe, J. Jeffrey Starn
Patterns and controls of foliar nutrient stoichiometry and flexibility across United States forests Patterns and controls of foliar nutrient stoichiometry and flexibility across United States forests
Plant element stoichiometry and stoichiometric flexibility strongly regulate ecosystem responses to global change. Here, we tested three potential mechanistic drivers (climate, soil nutrients, and plant taxonomy) of both using paired foliar and soil nutrient data from terrestrial forested National Ecological Observatory Network sites across the USA. We found that broad patterns of foliar...
Authors
Katherine A Kynarski, Fiona M. Soper, Sasha C. Reed, William R Wieder, Cory C Cleveland
Backpack electrofishing does not contribute to external signs of gas bubble trauma in sculpins Backpack electrofishing does not contribute to external signs of gas bubble trauma in sculpins
We exposed prickly sculpin Cottus asper and reticulate sculpin Cottus perplexus to electroshock and sham treatments in a controlled laboratory setting to determine if backpack electrofishing contributed to or exacerbated external signs of gas bubble trauma (GBT) in fish exposed to elevated total dissolved gas (TDG) levels. Fish were exposed to 115, 120 and 125% TDG (measured as percent...
Authors
Kenneth F. Tiffan, Nicole Joy Eller
Availability of lesser prairie-chicken nesting habitat impairs restoration success Availability of lesser prairie-chicken nesting habitat impairs restoration success
Regional populations of lesser prairie-chickens (Tympanuchus pallidicinctus) have been declining irregularly since the early 1900s (Jensen et al. 2000). Populations in the Sand Sagebrush Prairie Ecoregion of Kansas and Colorado, USA, have been experiencing declines during the last 2 decades. Ecoregion-wide declines included the Cimarron and Comanche National Grasslands in southwestern...
Authors
Liam A. Berigan, Carly S. H. Aulicky, Elisabeth C. Teige, Daniel S. Sullins, David A. Haukos, Kent A. Fricke, Jonathan H. Reitz, Liza G. Rossi, Kraig A. Schultz, Andrew Ricketts