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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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Understanding the role of initial soil moisture and precipitation magnitude in flood forecast using a hydrometeorological modelling system Understanding the role of initial soil moisture and precipitation magnitude in flood forecast using a hydrometeorological modelling system
We adapted the WRF-Hydro modelling system to Hurricane Florence (2018) and performed a series of diagnostic experiments to assess the influence of initial soil moisture and precipitation magnitude on flood simulation over the Cape Fear River basin in the United States. Model results suggest that: (1) The modulation effect of initial soil moisture on the flood peak is non-linear and...
Authors
Dongxiao Yin, George Xue, Daoyang Bao, Arezoo RafieeiNasab, Yongjie Huang, Mirce Morales, John C. Warner
Identifying shared priorities for a bioregional approach to restoration in the Northern Gulf of Mexico Identifying shared priorities for a bioregional approach to restoration in the Northern Gulf of Mexico
Natural resource management is often challenged with a mismatch between the scale of decision-making and the scale of the biological, ecological, and physical processes that control a system. Bioregional approaches to adaptive management have emerged as an approach to inform natural resource management at ecologically relevant scales and across multi-level governance structures. The...
Authors
Kelly G. Guilbeau, Ann C Hijuelos, Stephanie Romanach, Gregory Steyer
Neural net detection of seismic features related to gas hydrates and free gas accumulations on the northern U.S. Atlantic margin Neural net detection of seismic features related to gas hydrates and free gas accumulations on the northern U.S. Atlantic margin
Bottom-simulating reflections (BSRs) that sometimes mark the base of the gas hydrate stability zone in marine sediments are often identified based on the reverse polarity reflections that cut across stratigraphic layering in seismic amplitude data. On the northern U.S. Atlantic margin (USAM) between Cape Hatteras and Hudson Canyon, legacy seismic data have revealed pronounced BSRs south...
Authors
Urmi Majumdar, Nathaniel C. Miller, Carolyn D. Ruppel
Establishment of invasive Black Carp (Mylopharyngodon piceus) in the Mississippi River basin: Identifying sources and year classes contributing to recruitment Establishment of invasive Black Carp (Mylopharyngodon piceus) in the Mississippi River basin: Identifying sources and year classes contributing to recruitment
Black Carp (Mylopharyngodon piceus) was imported to the USA to control aquaculture pond snails. This species has escaped captivity and occurs in parts of the Mississippi River, several tributaries, and floodplain lakes, which is concerning due to potential competition with native fishes and predation on native mussels, many of which are imperiled. However, Black Carp captures have...
Authors
Gregory W. Whitledge, Patrick T. Kroboth, Duane Chapman, Quinton E. Phelps, Wesley Sleeper, Jennifer Bailey, Jill Jenkins
Prioritizing pesticides of potential concern and identifying potential mixture effects in Great Lakes tributaries using passive samplers Prioritizing pesticides of potential concern and identifying potential mixture effects in Great Lakes tributaries using passive samplers
To help meet the objectives of the Great Lakes Restoration Initiative with regard to increasing knowledge about toxic substances, 223 pesticides and pesticide transformation products were monitored in 15 Great Lakes tributaries using polar organic chemical integrative samplers. A screening-level assessment of their potential for biological effects was conducted by computing toxicity...
Authors
Luke C. Loken, Steven R. Corsi, David A. Alvarez, Gerald T. Ankley, Austin K. Baldwin, Bradley D. Blackwell, Laura A. DeCicco, Michelle A. Nott, Samantha K. Oliver, Daniel L. Villeneuve
Drought and water management in ancient Maya society Drought and water management in ancient Maya society
Paleoclimate research in the Maya region of Mesoamerica provides compelling evidence of drought during key periods of cultural transition in Maya society. These include the transition from the Preclassic to the Classic, and from Classic to the Postclassic. Previous research emphasized a causal relationship between drought and cultural change, or so-called “collapse” in the Maya region...
Authors
Tripti Bhattacharya, Samantha Krause, Dan Penny, David Wahl
Discovery of prolactin-like in lamprey: Role in osmoregulation and new insight into the evolution of the growth hormone/prolactin family Discovery of prolactin-like in lamprey: Role in osmoregulation and new insight into the evolution of the growth hormone/prolactin family
We used a representative of one of the oldest extant vertebrate lineages (jawless fish or agnathans) to investigate the early evolution and function of the growth hormone (GH)/prolactin (PRL) family. We identified a second member of the GH/PRL family in an agnathan, the sea lamprey (Petromyzon marinus). Structural, phylogenetic, and synteny analyses supported the identification of this...
Authors
Ningping Gong, Diogo Ferreira-Martins, Jessica L. Norstog, Stephen D. McCormick, Mark Sheridan
Tapwater exposures, effects potential, and residential risk management in Northern Plains Nations Tapwater exposures, effects potential, and residential risk management in Northern Plains Nations
In the United States (US), private-supply tapwater (TW) is rarely monitored. This data gap undermines individual/community risk-management decision-making, leading to an increased probability of unrecognized contaminant exposures in rural and remote locations that rely on private wells. We assessed point-of-use (POU) TW in three northern plains Tribal Nations, where ongoing TW arsenic...
Authors
Paul M. Bradley, Kristin M. Romanok, Kelly L. Smalling, Michael J. Focazio, Robert Charboneau, Christine Marie George, Ana Navas-Acien, Marcia O’Leary, Reno Red Cloud, Tracy Zacher, Sara E. Breitmeyer, Mary C. Cardon, Christa K. Cuny, Guthrie Ducheneaux, Kendra Enright, Nicola Evans, James L. Gray, David E. Harvey, Michelle L. Hladik, Leslie K. Kanagy, Keith A. Loftin, R. Blaine McCleskey, Elizabeth Medlock-Kakaley, Shannon M. Meppelink, Joshua F. Valder, Christopher P. Weis
Biostratigraphically significant palynofloras from the Paleocene–Eocene boundary of the USA Biostratigraphically significant palynofloras from the Paleocene–Eocene boundary of the USA
Pollen and spores were recovered from the Paleocene Fort Union Formation and Paleocene–Eocene Willwood Formation of the Bighorn Basin (BHB), northwestern Wyoming, USA. In many local stratigraphic sections in the BHB, the base of the Eocene has been identified by the characteristic negative carbon isotope excursion (CIE) that marks the beginning of the Paleocene–Eocene Thermal Maximum...
Authors
Vera A. Korasidis, Scott L. Wing, Guy J. Harrington, Thomas Demchuk, J. Gfavendyck, Phillip E. Jardine, Debra A. Willard
Density estimation in terrestrial chelonian populations using spatial capture–recapture and search–encounter surveys Density estimation in terrestrial chelonian populations using spatial capture–recapture and search–encounter surveys
Having an accurate estimate of population size and density is imperative to the conservation of chelonian species and a central objective of many monitoring programs. Capture–recapture and related methods are widely used to obtain information about population size of chelonians. However, classical capture–recapture methods have strict spatial sampling requirements and do not account for...
Authors
J. Andrew Royle, Haley Turner
Transcriptome signatures of wastewater effluent exposure in larval zebrafish vary with seasonal mixture composition in an effluent-dominated stream Transcriptome signatures of wastewater effluent exposure in larval zebrafish vary with seasonal mixture composition in an effluent-dominated stream
Wastewater treatment plant (WWTP) effluent-dominated streams provide critical habitat for aquatic and terrestrial organisms but also continually expose them to complex mixtures of pharmaceuticals that can potentially impair growth, behavior, and reproduction. Currently, few biomarkers are available that relate to pharmaceutical-specific mechanisms of action. In the experiment reported in...
Authors
Emma B. Meade, Luke R. Iwanowicz, Nicklaus Neureuther, Gregory H. LeFevre, Dana W. Kolpin, Hui Zhi, Shannon M. Meppelink, Rachael F. Lane, Angela Schmoldt, Aurash Mohaimani, Olaf Mueller, Rebecca D. Klaper
Flopy: The Python interface for MODFLOW Flopy: The Python interface for MODFLOW
No abstract available.
Authors
Andrew T. Leaf, Michael N. Fienen