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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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Spatial and temporal variability in summertime dissolved carbon dioxide and methane in temperate ponds and shallow lakes Spatial and temporal variability in summertime dissolved carbon dioxide and methane in temperate ponds and shallow lakes
Small waterbodies have potentially high greenhouse gas emissions relative to their small footprint on the landscape, although there is high uncertainty in model estimates. Scaling their carbon dioxide (CO2) and methane (CH4) exchange with the atmosphere remains challenging due to an incomplete understanding and characterization of spatial and temporal variability in CO2 and CH4. Here, we...
Authors
Nicholas E. Ray, Meredith Holgerson, Mikkel Rene Andersen, Janis Bikse, Lauren E Bortolotti, Martyn N. Futter, Ilga Kokorite, Alan Law, Cory P. McDonald, Jorrit Mesman, Mike Peacock, David Richardson, Julien Arsenault, Sheel Bansal, Kaelin M Cawley, Kerri Finlay, McKenzie A. Kuhn, Amir Reza Shahabinia, Facundo Smufer
Policy comparison of lead hunting ammunition bans and voluntary nonlead programs for California condors Policy comparison of lead hunting ammunition bans and voluntary nonlead programs for California condors
The endangered California condor (Gymnogyps californianus) is negatively affected by lead poisoning from spent lead-based hunting ammunition. Because lead poisoning is the primary mortality factor affecting condors, the California Fish and Game Commission banned lead hunting ammunition during 2008 in the southern California condor range followed by a statewide ban implemented in 2019. In...
Authors
John H. Schulz, Samantha Totoni, Sonja A. Wilhelm Stanis, Christine Jie Li, Mark Morgan, Damon M. Hall, Elisabeth B. Webb, Robin M. Rotman
Exchange of carbapenem-resistant Escherichia coli Sequence Type 38 intercontinentally and among wild bird, human, and environmental niches Exchange of carbapenem-resistant Escherichia coli Sequence Type 38 intercontinentally and among wild bird, human, and environmental niches
Carbapenem-resistant Enterobacteriaceae (CRE) are a global threat to human health and are increasingly being isolated from nonclinical settings. OXA-48-producing Escherichia coli sequence type 38 (ST38) is the most frequently reported CRE type in wild birds and has been detected in gulls or storks in North America, Europe, Asia, and Africa. The epidemiology and evolution of CRE in...
Authors
Christina A. Ahlstrom, Hanna Woksepp, Linus Sandegren, Andrew M. Ramey, Jonas Bonnedahl
Bioaccumulation kinetics of model pharmaceuticals in the freshwater unionid pondmussel, Sagittunio subrostratus Bioaccumulation kinetics of model pharmaceuticals in the freshwater unionid pondmussel, Sagittunio subrostratus
Bioaccumulation of ionizable pharmaceuticals has been increasingly studied, with most reported aquatic tissue concentrations in field or laboratory experiments being from fish. However, higher levels of antidepressants have been observed in bivalves compared with fish from effluent-dominated and dependent surface waters. Such observations may be important for biodiversity because...
Authors
S. Rebekah Burket, Jaylen L. Sims, Rebecca A. Dorman, Nile E. Kemble, Eric Brunson, Jeffery A. Steevens, Bryan W. Brooks
Supervised versus unsupervised approaches to classification of accelerometry data Supervised versus unsupervised approaches to classification of accelerometry data
Sophisticated animal-borne sensor systems are increasingly providing novel insight into how animals behave and move. Despite their widespread use in ecology, the diversity and expanding quality and quantity of data they produce have created a need for robust analytical methods for biological interpretation. Machine learning tools are often used to meet this need. However, their relative...
Authors
Maitreyi Sur, Jonathan C. Hall, Joseph Brandt, Molly Astell, Sharon A. Poessel, Todd E. Katzner
Measuring basin-scale aquifer storage change and mapping specific yield in Albuquerque, New Mexico, USA, with repeat microgravity data Measuring basin-scale aquifer storage change and mapping specific yield in Albuquerque, New Mexico, USA, with repeat microgravity data
Study Region The groundwater basin underlying the City of Albuquerque, New Mexico, USA. Study Focus The study focuses on changes in groundwater storage and how those changes relate to groundwater-level changes. Groundwater storage change was measured using repeat microgravity at 35 stations from 2016 to 2021. Usually, storage is monitored by converting groundwater-level changes to...
Authors
Jeffrey R. Kennedy, Meghan T. Bell
Relative contributions of water-level components to extreme water levels along the US Southeast Atlantic Coast from a regional-scale water-level hindcast Relative contributions of water-level components to extreme water levels along the US Southeast Atlantic Coast from a regional-scale water-level hindcast
A 38-year hindcast water level product is developed for the U.S. Southeast Atlantic coastline from the entrance of Chesapeake Bay to the southeast tip of Florida. The water level modelling framework utilized in this study combines a global-scale hydrodynamic model (Global Tide and Surge Model, GTSM-ERA5), a novel ensemble-based tide model, a parameterized wave setup model, and...
Authors
Kai Alexander Parker, Li H. Erikson, Jennifer Anne Thomas, Cornelis M. Nederhoff, Patrick L. Barnard, Sanne Muis
Spatial variability in vertical accretion and carbon sequestration in salt marsh soils of an urban estuary Spatial variability in vertical accretion and carbon sequestration in salt marsh soils of an urban estuary
Salt marshes in New York City’s Jamaica Bay have been disappearing and deteriorating since early 1900s, resulting in the loss of long-term accumulated carbon storage. However, the spatial variations and mechanisms in vertical accretion and soil organic carbon (SOC) sequestration across this highly urbanized estuary remains unclear. In this study, we collected soil cores to a depth of ~...
Authors
Hongqing Wang, Gregg A. Snedden, Ellen K. Hartig, Q. Chen
Reference genome of an iconic lizard in western North America, Blainville’s horned lizard Phrynosoma blainvillii Reference genome of an iconic lizard in western North America, Blainville’s horned lizard Phrynosoma blainvillii
Genome assemblies are increasingly being used to identify adaptive genetic variation that can help prioritize the population management of protected species. This approach may be particularly relevant to species like Blainville’s horned lizard, Phrynosoma blainvillii, due to its specialized diet on noxious harvester ants, numerous adaptative traits for avoiding predation (e.g. cranial...
Authors
Jonathan Q. Richmond, Jimmy A. McGuire, Merly Escalona, Mohan P. A. Marimuthu, Oanh Nguyen, Samuel Sacco, Eric Beraut, Erin Toffelmier, Robert N. Fisher, Ian J. Wang, H.B. Shaffer
Compensatory mortality explains rodent resilience to an invasive predator Compensatory mortality explains rodent resilience to an invasive predator
Invasive Burmese pythons (Python bivittatus) in the Everglades of Florida, United States, have drastically reduced populations of mammals, yet populations of some rodents appear unaffected by the invasion. To understand this pattern, we radio-tagged cotton rats (Sigmodon hispidus) in areas of high and low python occurrence densities (hereafter occurrence) and quantified the effects of...
Authors
Marina E. McCampbell, Margaret Hunter, John V. Stechly, Kaitlyn N. Leist, Kristen Hart, Robert A. McCleery
Breaking plates: Creation of the East Anatolian fault, the Anatolian plate, and a tectonic escape system Breaking plates: Creation of the East Anatolian fault, the Anatolian plate, and a tectonic escape system
Lateral movement of lithospheric fragments along strike-slip faults in response to collision (escape tectonics) has characterized convergent settings since the onset of plate tectonics and is a mechanism for the formation of new plates. The Anatolian plate was created by the sequential connection of strike-slip faults following ≥10 m.y. of distributed deformation that ultimately...
Authors
Donna L. Whitney, Jonathan Delph, Stuart N. Thomson, Susan L. Beck, Gilles Brocard, Michael A. Cosca, Michael H. Darin, Nuretdin Kaymakci, Maud J.M. Meijers, Aral Okay, Bora Rojay, Christian Teyssier, Paul J. Umhoefer
Rift basins and intraplate earthquakes: New high-resolution aeromagnetic data provide insights into buried structures of the Charleston, South Carolina seismic zone Rift basins and intraplate earthquakes: New high-resolution aeromagnetic data provide insights into buried structures of the Charleston, South Carolina seismic zone
The delineation of faults that pose seismic risk in intraplate seismic zones and the mapping of features associated with failed rift basins can help our understanding of links between the two. We use new high-resolution aeromagnetic data, previous borehole sample information, and reprocessed seismic reflection profiles to image subsurface structures and evaluate recent fault activity...
Authors
Anjana K. Shah, Thomas L. Pratt, J. Wright Horton,