Publications
These publications showcase the significant science conducted in our Science Centers.
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Evidence of population resistance to extreme low flows in a fluvial-dependent fish species
Extreme low streamflows are natural disturbances to aquatic populations. Species in naturally intermittent streams display adaptations that enhance persistence during extreme events; however, the fate of populations in perennial streams during unprecedented low-flow periods is not well-understood. Biota requiring swift-flowing habitats may be especially vulnerable to flow reductions. We estimated
Authors
Rachel A. Katz, Mary Freeman
Topographic and Hydrographic GIS Datasets for the Afghanistan Geological Survey and U.S. Geological Survey 2014 Mineral Areas of Interest
Mineral extraction and associated industries play an important role in the Afghan economy, particularly in the “transitional era” of declining foreign aid and withdrawal of foreign troops post 2014. In addition to providing a substantial source of government revenue, other potential benefits of natural resource development include boosted exports, employment opportunities, and strengthened industr
Authors
Jessica D. DeWitt, Peter G. Chirico, Katherine C. Malpeli
Porphyry copper assessment of the Tethys region of western and southern Asia: Chapter V in Global mineral resource assessment
A probabilistic mineral resource assessment of undiscovered resources in porphyry copper deposits in the Tethys region of western and southern Asia was carried out as part of a global mineral resource assessment led by the U.S. Geological Survey (USGS). The purpose of the study was to delineate geographic areas as permissive tracts for the occurrence of porphyry copper deposits at a scale of 1:1,0
Authors
Lukas Zürcher, Arthur A. Bookstrom, Jane M. Hammarstrom, John C. Mars, Stephen Ludington, Michael L. Zientek, Pamela Dunlap, John C. Wallis, Lawrence J. Drew, David M. Sutphin, Byron R. Berger, Richard J. Herrington, Mario Billa, Ilkay Kuşcu, Charles J. Moon, Jeremy P. Richards
Simulating range-wide population and breeding habitat dynamics for an endangered woodland warbler in the face of uncertainty
Population viability analyses provide a quantitative approach that seeks to predict the possible future status of a species of interest under different scenarios and, therefore, can be important components of large-scale species’ conservation programs. We created a model and simulated range-wide population and breeding habitat dynamics for an endangered woodland warbler, the golden-cheeked warbler
Authors
Adam Duarte, Jeffrey Hatfield, Todd M. Swannack, Michael R. J. Forstner, M. Clay Green, Floyd W. Weckerly
Karst mapping in the United States: Past, present and future
The earliest known comprehensive karst map of the entire USA was published by Stringfield and LeGrand (1969), based on compilations of William E. Davies of the U.S. Geological Survey (USGS). Various versions of essentially the same map have been published since. The USGS recently published new digital maps and databases depicting the extent of known karst, potential karst, and pseudokarst areas of
Authors
David J. Weary, Daniel H. Doctor
Application of a fluidized bed reactor charged with aragonite for control of alkalinity, pH and carbon dioxide in marine recirculating aquaculture systems
Control of alkalinity, dissolved carbon dioxide (dCO2), and pH are critical in marine recirculating aquaculture systems (RAS) in order to maintain health and maximize growth. A small-scale prototype aragonite sand filled fluidized bed reactor was tested under varying conditions of alkalinity and dCO2 to develop and model the response of dCO2 across the reactor. A large-scale reactor was then incor
Authors
PhD Paul S Wills, Timothy Pfeiffer, Richard Baptiste, Barnaby J. Watten
Flushing of distal hillslopes as an alternative source of stream dissolved organic carbon in a headwater catchment
We investigated potential source areas of dissolved organic carbon (DOC) in headwater streams by examining DOC concentrations in lysimeter, shallow well, and stream water samples from a reference catchment at the Hubbard Brook Experimental Forest. These observations were then compared to high-frequency temporal variations in fluorescent dissolved organic matter (FDOM) at the catchment outlet and t
Authors
John P Gannon, Scott W. Bailey, Kevin J. McGuire, James B. Shanley
Conflict minerals from the Democratic Republic of the Congo—Gold supply chain
The U.S. Geological Survey (USGS) analyzes mineral and metal supply chains to identify and describe major components of material flows from ore extraction, through intermediate forms, to a final product. Supply chain analyses may be used to identify risks to the United States associated with the supply of critical and strategic minerals and metals and to provide greater supply chain transparency s
Authors
Micheal W. George
Introductory text
The U.S. Geological Survey (USGS) provides information on the current use and flow of minerals and mineral-based materials in the U.S. and world economies. This Data Series report on “Historical Global Statistics for Mineral and Material Commodities” contains information on the production of selected commodities from 1990 to the most current year. The data may be used in the analysis of socioecono
Authors
Grecia R. Matos, Lisa D. Miller, James J. Barry
Water Quality, Cyanobacteria, and Environmental Factors and Their Relations to Microcystin Concentrations for Use in Predictive Models at Ohio Lake Erie and Inland Lake Recreational Sites, 2013-14
Harmful cyanobacterial “algal” blooms (cyanoHABs) and associated toxins, such as microcystin, are a major water-quality issue for Lake Erie and inland lakes in Ohio. Predicting when and where a bloom may occur is important to protect the public that uses and consumes a water resource; however, predictions are complicated and likely site specific because of the many factors affecting toxin producti
Authors
Donna S. Francy, Jennifer L. Graham, Erin A. Stelzer, Christopher D. Ecker, Amie M.G. Brady, Pam Struffolino, Keith A. Loftin
A method for estimating abundance of mobile populations using telemetry and counts of unmarked animals
While numerous methods exist for estimating abundance when detection is imperfect, these methods may not be appropriate due to logistical difficulties or unrealistic assumptions. In particular, if highly mobile taxa are frequently absent from survey locations, methods that estimate a probability of detection conditional on presence will generate biased abundance estimates. Here, we propose a new e
Authors
Matthew Clement, Joy M O'Keefe, Brianne Walters
Discovering loose group movement patterns from animal trajectories
The technical advances of positioning technologies enable us to track animal movements at finer spatial and temporal scales, and further help to discover a variety of complex interactive relationships. In this paper, considering the loose gathering characteristics of the real-life groups' members during the movements, we propose two kinds of loose group movement patterns and corresponding discover
Authors
Yuwei Wang, Ze Luo, Yan Xiong, Diann J. Prosser, Scott H. Newman, John Y. Takekawa, Baoping Yan