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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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Using community-reported data to understand how boat speed affects marine wildlife: An example with the Florida manatee Using community-reported data to understand how boat speed affects marine wildlife: An example with the Florida manatee
Boat collisions are a known and increasing threat to many marine wildlife populations. The Florida manatee Trichechus manatus latirostris is a key example of a species with high boat-related mortality, whose long-term viability and population are limited by human activities in shared habitats. The goal of this work was to quantify the probability of lethal injury to Florida manatees...
Authors
Bea Combs-Hintze, Jeffrey A. Hostetler, C.S. Calleson, B. Basset, C. Ainsworth, Julien Martin
Evaluation of rapid DNA extraction methods to better enable point-of-use environmental DNA detection Evaluation of rapid DNA extraction methods to better enable point-of-use environmental DNA detection
Recent developments in molecular testing have created the opportunity for biologists and managers to detect environmental DNA (eDNA) of target species rapidly and without the requirement of a laboratory. These point-of-use protocols may be especially useful for early detection and rapid response for invasive species or surveillance for at-risk native species, where timely management...
Authors
Melisa E. Kozaczek, Stephen Frank Spear, Tyler J. Untiedt, Paul Albosta, Caden Jungbluth, Jared J. Homola, Elliott Barnhart, Christopher M. Merkes
A novel approach to increase accuracy in remotely sensed evapotranspiration through basin water balance and flux tower constraints A novel approach to increase accuracy in remotely sensed evapotranspiration through basin water balance and flux tower constraints
Remote sensing-derived evapotranspiration (RSET) products capture the spatiotemporal variations of evapotranspiration (ET) from field to basin scales with unprecedented details. However, their accuracy varies across RSET estimation methods and diverse hydroclimate regions. While ET modeling efforts to account for biophysical processes and controlling parameters have made good progress in...
Authors
Kul Bikram Khand, Gabriel B. Senay, MacKenzie Friedrichs, Koong Yi, Joshua Fisher, Lixin Wang, Kosana Suvočarev, Arman Ahmadi, Housen Chu, Stephen P. Good, Kanishka Mallick, Justine E.C. Missik, Jacob A. Nelson, David E. Reed, Tianxin Wang, Xiangming Xiao
Coelomic foreign bodies in wild-caught Python spp. in the Greater Everglades Ecosystem, Florida, USA Coelomic foreign bodies in wild-caught Python spp. in the Greater Everglades Ecosystem, Florida, USA
Burmese pythons (Python molurus bivittatus) and African rock pythons (Python sebae) have established invasive populations in southern Florida, severely disrupting local ecosystems. We analysed necropsy data from 2,179 pythons captured between 2006 and 2022, revealing nine cases of coelomic foreign bodies, primarily consisting of bird beaks, which presumably entered the coelom following...
Authors
Gretchen E. Anderson, McKayla M. Spencer, Ray W. Snow, Andrea Currylow, Frank N. Ridgley, Bryan G. Falk, Amy A. Yackel Adams
Spatial and temporal variability of perfluoroalkyl and polyfluoroalkyl substances in major rivers of New Mexico, USA Spatial and temporal variability of perfluoroalkyl and polyfluoroalkyl substances in major rivers of New Mexico, USA
Perfluoroalkyl and polyfluoroalkyl substances (PFAS) are ubiquitous in the environment, but sources that contribute to temporal and spatial variability in surface waters are not well defined. Many states are assessing PFAS in water resources, and insight from these statewide assessments can help guide future sampling efforts. A statewide assessment of 28 PFAS was conducted in New Mexico...
Authors
Kimberly R. Beisner
Unintended indirect effects limit elk productivity from supplemental feeding in the Greater Yellowstone Ecosystem Unintended indirect effects limit elk productivity from supplemental feeding in the Greater Yellowstone Ecosystem
The widespread practice of supplemental feeding, a bottom-up forcing of resource availability, is intended to improve wildlife population health and survival. However, supplemental feeding could trigger indirect effects by altering predation rates and disease dynamics. We investigated the effects of feeding on three key elk (Cervus canadensis) population productivity metrics (calf:cow...
Authors
Brian Scott Dugovich, Emily M. Tomaszewski, Eric K. Cole, Sarah Dewey, Daniel MacNulty, Brandon Scurlock, Daniel Stahler, Paul C. Cross
Molecular evolution of TRPC4 regulatory sequences supports a role in mammalian thermoregulatory adaptation Molecular evolution of TRPC4 regulatory sequences supports a role in mammalian thermoregulatory adaptation
BackgroundProteins encoded by the canonical transient receptor potential (Trpc) gene family form transmembrane channels involved in diverse signal-transduction pathways. Trpc4 has been shown necessary for the induction of nonshivering thermogenesis (NST) in mice, a key component of which is thermogenic brown adipose tissue (BAT). In bats, Trpc4 exhibited diversifying selection within...
Authors
Robert S. Cornman
Chlorophyll trends are negative for lakes but positive for estuarine–coastal waters Chlorophyll trends are negative for lakes but positive for estuarine–coastal waters
Nutrient (nitrogen and phosphorus) pollution is an environmental problem of global concern because overenrichment of water bodies increases phytoplankton biomass and ecosystem metabolism, depletes oxygen in bottom waters, and increases the frequency and intensity of harmful algal blooms. These responses to nutrient pollution have motivated policies to reduce anthropogenic nutrient inputs...
Authors
James E. Cloern, Alan Jassby
Soil moisture partitioning between under canopy and interspace environments in shrublands of the northern Chihuahuan Desert Soil moisture partitioning between under canopy and interspace environments in shrublands of the northern Chihuahuan Desert
Soil moisture is a key link between hydrologic and ecologic processes in desert shrublands. Understanding how soil moisture is spatially distributed in desert shrublands provides valuable insights into how shrubs use and impact limiting water resources, and how shrublands may respond to future meteorological and climate change. Our goals were to determine how soil moisture is partitioned...
Authors
Juan Pinos, Keegan Hammond, Michael C. Duniway, John P. Anderson, Niall P. Hanan, Matthew D. Petrie
Comparing year-class strength indices from longitudinal analysis of catch-at-age data with those from catch-curve regression: Application to Lake Huron lake trout Comparing year-class strength indices from longitudinal analysis of catch-at-age data with those from catch-curve regression: Application to Lake Huron lake trout
Fish year-class strength (YCS) has been estimated via longitudinal analysis of catch-at-age data and via catch-curve regression, but no study has compared the two approaches. The objective of this study was to compare YCS estimates derived from both approaches applied to catch-at-age data for the lake trout (Salvelinus namaycush) population in the main basin of Lake Huron, one of the...
Authors
Ji X. He, Charles P. Madenjian
Evidence for fluid pressurization of fault zones and persistent sensitivity to injection rate beneath the Raton Basin Evidence for fluid pressurization of fault zones and persistent sensitivity to injection rate beneath the Raton Basin
Subsurface wastewater injection has increased the seismicity rate within the Raton Basin over more than two decades, with the basin-wide injection rate peaked between 2009-2015. To understand the evolution of injection-induced earthquakes, we systematically analyzed 2016-2024 broadband recordings with a machine-learning-based phase picker and constructed a catalog with 95,993 earthquakes...
Authors
Mohammadreza Jamalreyhani, Ruijia Wang, Brandon Schmandt, Andres Felipe Peña Castro, Margaret Elizabeth Glasgow
Disease-driven collapse of the native Kauaʻi avifauna and the rise of introduced bird species Disease-driven collapse of the native Kauaʻi avifauna and the rise of introduced bird species
Hawaii hosts one of Earth’s most unique and threatened avifaunas. Upslope migration of mosquito-vectored avian malaria on Kauaʻi (maximum elevation 1,598 m) has likely caused its rapid loss of avifaunal diversity; only 8 of 13 historic forest bird species remain. We update the status and trends of Kauaʻi forest bird populations since the original (1981) surveys using the latest (2023)...
Authors
Noah J. Hunt, Lisa H. Crampton, Tyler A Winter, Jack D Alexander, Roy Glib, Richard J. Camp