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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.
Browse more than 65,000 articles 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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Satellite telemetry reveals space use of diamondback terrapins Satellite telemetry reveals space use of diamondback terrapins
Movement and space use information of exploited and imperiled coastal species is critical to management and conservation actions. While satellite telemetry has been successfully used to document movements of marine turtles, the large tag sizes available have limited use on smaller turtle species. We used small Argos-based satellite tags to document movement patterns of diamondback...
Authors
Margaret Lamont, Melissa E. Price, Daniel J. Catizone
Range-wide trends in tiger conservation landscapes, 2001 - 2020 Range-wide trends in tiger conservation landscapes, 2001 - 2020
Of all the ways human beings have modified the planet over the last 10,000 years, habitat loss is the most important for other species. To address this most critical threat to biodiversity, governments, non-governmental actors, and the public need to know, in near real-time, where and when habitat loss is occurring. Here we present an integrated habitat modelling system at the range-wide...
Authors
Eric W. Sanderson, Dale G. Miquelle, Kim Fisher, Abishek Harihar, Chris Clark, Jesse Moy, Peter V. Potapov, Nathaniel P. Robinson, Lucinda Royte, Dustin Sampson, Jamie S Sanderlin, Charles B. Yackulic, Michael Belecky, Urs Breitenmoser, Christine Breitenmoser-Wursten, Pranav Chanchani, Stuart Chapman, Arpit Deomurari, Somphot Duangchantrasiri, Elisa Facchini, Thomas N.E. Gray, John Goodrich, Luke Hunter, Matthew Linkie, Willy Marthy, Akchousanh Rasphone, Sogoto Roy, Detrit Sittibal, Tshering Tempa, Mayuree Umponjan, Karen Wood
Imaging freshwater and saline aquifers beneath Bradford County, Pennsylvania, USA, using Audio-Magnetotelluric (AMT) data Imaging freshwater and saline aquifers beneath Bradford County, Pennsylvania, USA, using Audio-Magnetotelluric (AMT) data
We investigate the utility of audio-magnetotelluric (AMT) data for detecting high electrical conductivity zones indicative of fresh and saline groundwater lenses at depths of ∼1000 m at seven survey sites in the southwestern corner of Bradford County, PA. Dimensionality analysis indicates the AMT data can be interpreted using two-dimensional (2-D) models. 2-D electrical resistivity...
Authors
Sampath Rathnayaka, Chloe Danielle Gustafson, David Yoxtheimer, Andrew Nyblade
Understanding fatality patterns and sex ratios of Brazilian free-tailed bats (Tadarida brasiliensis) at wind energy facilities in western California and Texas Understanding fatality patterns and sex ratios of Brazilian free-tailed bats (Tadarida brasiliensis) at wind energy facilities in western California and Texas
Background
Authors
Sarah Licari, Amanda Hale, Sara Weaver, Sarah R. Fritts, Todd E. Katzner, David H. Nelson, Dean Williams
Adult mosquito and butterfly exposure to permethrin and relative risk following ULV sprays from a truck-mounted sprayer Adult mosquito and butterfly exposure to permethrin and relative risk following ULV sprays from a truck-mounted sprayer
Ground applications of adulticides via a specialized truck-mounted sprayer are one of the most common practices for control of flying adult mosquitoes. Aerosols released to drift through a targeted area persist in the air column to contact and kill flying mosquitoes, but may also drift into adjacent areas not targeted by the applications where it may affect nontarget insects such as...
Authors
Timothy Bargar, Yongxing Jiang
Differential heat shock protein responses in two species of Pacific salmon and their utility in identifying heat stress Differential heat shock protein responses in two species of Pacific salmon and their utility in identifying heat stress
Rapid and accelerating warming of salmon habitat has the potential to lower productivity of Pacific salmon (Oncorhynchus species) populations. Heat stress biomarkers can indicate where warming is most likely affecting fish populations; however, we often lack clear classifications that separate individuals with and without heat stress needed to make these tools operational. We conducted a...
Authors
Vanessa R. von Biela, Amy M. Regish, Lizabeth Bowen, Ashley E. Stanek, Shannon C. Waters-Dynes, Michael P. Carey, Christian E. Zimmerman, Jonathon Gerken, Daniel Rinella, Stephen D. McCormick
Competition between dissolved organic matter and freshwater plankton control methylmercury isotope fractionation during uptake and photochemical demethylation Competition between dissolved organic matter and freshwater plankton control methylmercury isotope fractionation during uptake and photochemical demethylation
Isotope fractionation related to photochemical reactions and planktonic uptake at the base of the food web is a major uncertainty in the biological application of mercury (Hg) stable isotopes. In freshwater systems, it is unclear how competitive interactions among methylmercury (MeHg), dissolved organic matter (DOM), and phytoplankton govern the magnitude of mass-dependent and mass...
Authors
Grace Jane Armstrong, Sarah E. Janssen, Brett A. Poulin, Michael T. Tate, David P. Krabbenhoft, James P. Hurley
Hyperspectral (VNIR-SWIR) analysis of roll front uranium host rocks and industrial minerals from Karnes and Live Oak Counties, Texas Coastal Plain Hyperspectral (VNIR-SWIR) analysis of roll front uranium host rocks and industrial minerals from Karnes and Live Oak Counties, Texas Coastal Plain
VNIR-SWIR (400–2500 nm) reflectance measurements were made on the surfaces of various cores, cuttings and sample splits of sedimentary rocks from the Tertiary Jackson Group, and Catahoula, Oakville and Goliad Formations. These rocks vary in composition and texture from mudstone and claystone to sandstone and are known host rocks for roll front uranium occurrences in Karnes and Live Oak...
Authors
Bernard E. Hubbard, Tanya J. Gallegos, Victoria G. Stengel, Todd M. Hoefen, Raymond F. Kokaly, Brent Elliott
Erratum to an evaluation of the timing accuracy of global and regional seismic stations and networks Erratum to an evaluation of the timing accuracy of global and regional seismic stations and networks
No abstract available.
Authors
Yihong Yang, Xiadong Song, Adam T. Ringler
Chromosome-level genome assembly of the blacktail brush lizard, Urosaurus nigricaudus, reveals dosage compensation in an endemic lizard Chromosome-level genome assembly of the blacktail brush lizard, Urosaurus nigricaudus, reveals dosage compensation in an endemic lizard
Urosaurus nigricaudus is a phrynosomatid lizard endemic to the Baja California Peninsula in Mexico. This work presents a chromosome-level genome assembly and annotation from a male individual. We used PacBio long reads and HiRise scaffolding to generate a high-quality genomic assembly of 1.87 Gb distributed in 327 scaffolds, with an N50 of 279 Mb and an L50 of 3. Approximately 98.4% of...
Authors
Elizabeth Davalos-Dehullu, Sarah M. Baty, Robert N. Fisher, Peter A. Scott, Greer A. Dolby, Adrian Munguia-Vega, Diego Cortez
Reservoir stratification modulates the influence of impoundments on fish mercury concentrations along an arid land river system Reservoir stratification modulates the influence of impoundments on fish mercury concentrations along an arid land river system
Impoundment is among the most common hydrologic alterations with impacts on aquatic ecosystems that can include effects on mercury (Hg) cycling. However, landscape-scale differences in Hg bioaccumulation between reservoirs and other habitats are not well characterized nor are the processes driving these differences. We examined total Hg (THg) concentrations of Smallmouth Bass...
Authors
James Willacker, Collin A. Eagles-Smith, Jim Chandler, Jesse Naymik, Ralph Myers, David P. Krabbenhoft
A review of natural and managed revegetation responses in two de-watered reservoirs after large dam removals on the Elwha River, Washington, USA A review of natural and managed revegetation responses in two de-watered reservoirs after large dam removals on the Elwha River, Washington, USA
Large dam removals are increasing in frequency and the response of natural and managed revegetation is a critical consideration for managed restoration of dewatered reservoir landscapes post dam removal. The removal of two large dams on the Elwha River in 2011-2014 provides insight into reservoir revegetation. We review literature and datasets from 2012 through 2018, 1-6 years since...
Authors
Joshua Chenoweth, Patrick B. Shafroth, Rebecca L. Brown, James M. Helfield, Jenise M. Bauman, Sara Cendejas-Zarelli, Chhaya M. Werner, Jarrett L. Schuster, Olivia A. Morgan