Geologic map of the Nepenthes Planum Region, Mars
James A. Skinner, Kenneth L. Tanaka
2018, Scientific Investigations Map 3389
This map product contains a map sheet at 1:1,506,000 scale that shows the geology of the Nepenthes Planum region of Mars, which is located between the cratered highlands that dominate the southern hemisphere and the less-cratered sedimentary plains that dominate the northern hemisphere. The map region contains cone- and mound-shaped landforms...
Dependence of the evolution of carbon dynamics in the northern permafrost region on the trajectory of climate change
A. David McGuire, David M. Lawrence, Charles Koven, Joy S. Clein, Eleanor J. Burke, Guangsheng Chen, Elchin Jafarov, Andrew H. MacDougall, Sergey S. Marchenko, Dmitry J. Nicolsky, Shushi Peng, Annette Rinke, Philippe Ciais, Isabelle Gouttevin, Daniel J. Hayes, Duoying Ji, Gerhard Krinner, John C. Moore, Vladimir Romanovsky, Christina Schadel, Kevin Schaefer, Edward A.G. Schuur, Qianlai Zhuang
2018, Proceedings of the National Academy of Sciences of the United States of America (115) 3882-3887
We conducted a model-based assessment of changes in permafrost area and carbon storage for simulations driven by RCP4.5 and RCP8.5 projections between 2010 and 2299 for the northern permafrost region. All models simulating carbon represented soil with depth, a critical structural feature needed to represent the permafrost carbon–climate feedback, but...
Drivers of solar radiation variability in the McMurdo Dry Valleys, Antarctica
Maciej K. Obryk, Andrew G. Fountain, Peter Doran, Berry Lyons, Ryan Eastman
2018, Scientific Reports (8)
Annually averaged solar radiation in the McMurdo Dry Valleys, Antarctica has varied by over 20 W m−2 during the past three decades; however, the drivers of this variability are unknown. Because small differences in radiation are important to water availability and ecosystem functioning in polar deserts, determining the causes are important to predictions...
Combining multiphase groundwater flow and slope stability models to assess stratovolcano flank collapse in the Cascade Range
Jessica L. Ball, Joshua M. Taron, Mark E. Reid, Shaul Hurwitz, Carol A. Finn, Paul A. Bedrosian
2018, Journal of Geophysical Research Solid Earth (123) 2787-2805
Hydrothermal alteration can create low‐permeability zones, potentially resulting in elevated pore‐fluid pressures, within a volcanic edifice. Strength reduction by rock alteration and high pore‐fluid pressures have been suggested as a mechanism for edifice flank instability. Here we combine numerical models of multiphase heat transport and groundwater...
Long-term population dynamics and conservation risk of migratory bull trout in the upper Columbia River basin
Ryan Kovach, Jonathan Armstrong, David Schmetterling, Robert Al-Chokhachy, Clint C. Muhlfeld
2018, Canadian Journal of Fisheries and Aquatic Sciences (75) 1960-1968
We used redd count data from 88 bull trout (Salvelinus confluentus) populations in the upper Columbia River basin to quantify local and regional patterns in population dynamics, including adult abundance, long-term trend, and population synchrony. We further used this information to assess conservation risk of metapopulations using eight population dynamic...
Groundwater quality in the Mokelumne, Cosumnes, and American River Watersheds, Sierra Nevada, California
Miranda S. Fram, Jennifer L. Shelton
2018, Open-File Report 2018-1047
Groundwater provides more than 40 percent of California’s drinking water. To protect this vital resource, the State of California created the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The GAMA Program’s Priority Basin Project assesses the quality of groundwater resources used for drinking water supply and increases public access to...
Shifting stream planform state decreases stream productivity yet increases riparian animal production
Michael P. Venarsky, David M. Walters, Robert O. Hall Jr., Bridget Livers, Ellen Wohl
2018, Oecologia (187) 167-180
In the Colorado Front Range (USA), disturbance history dictates stream planform. Undisturbed, old-growth streams have multiple channels and large amounts of wood and depositional habitat. Disturbed streams (wildfires and logging < 200 years ago) are single-channeled with mostly erosional habitat. We tested how these opposing stream states influenced organic matter, benthic macroinvertebrate...
The role of frozen soil in groundwater discharge predictions for warming alpine watersheds
Sarah G. Evans, Shemin Ge, Clifford I. Voss, Noah P. Molotch
2018, Water Resources Research (54) 1599-1615
Climate warming may alter the quantity and timing of groundwater discharge to streams in high alpine watersheds due to changes in the timing of the duration of seasonal freezing in the subsurface and snowmelt recharge. It is imperative to understand the effects of seasonal freezing and recharge on groundwater discharge...
Functional group, biomass, and climate change effects on ecological drought in semiarid grasslands
Scott D. Wilson, Daniel R. Schlaepfer, John B. Bradford, William K. Lauenroth, Michael C. Duniway, Sonia A. Hall, Khishigbayar Jamiyansharav, Gensuo Jia, Ariuntsetseg Lkhagva, Seth M. Munson, David A. Pyke, Britta Tietjen
2018, Journal of Geophysical Research G: Biogeosciences (123) 1072-1085
Water relations in plant communities are influenced both by contrasting functional groups (grasses, shrubs) and by climate change via complex effects on interception, uptake and transpiration. We modelled the effects of functional group replacement and biomass increase, both of which can be outcomes of invasion and vegetation management, and climate...
Managing an invasive corallimorph at Palmyra Atoll National Wildlife Refuge, Line Islands, Central Pacific
Thierry M. Work, Greta S. Aeby, Benjamin P. Neal, Nichole N. Price, Eric Conklin, Amanda Pollock
2018, Biological Invasions (20) 2197-2208
In 2007, a phase shift from corals to corallimorpharians (CM) centered around a shipwreck was documented at Palmyra Atoll, Line Islands. Subsequent surveys revealed CM to be overgrowing the reef benthos, including corals and coralline algae, potentially placing coral ecosystems in the atoll at risk. This prompted the U.S. Fish...
The sedimentological characteristics and geochronology of the marshes of Dauphin Island, Alabama
Alisha M. Ellis, Christopher G. Smith, Marci E. Marot
2018, Open-File Report 2017-1165
In August 2015, scientists from the U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center collected 11 push cores from the marshes of Dauphin Island and Little Dauphin Island, Alabama. Sample site environments included high marshes, low salt marshes, and salt flats, and varied in distance from the shoreline....
The Chief Joseph Hatchery Program spring Chinook 2018 annual report
Andrea Pearl, Matthew Laramie, Casey Baldwin, John Rohrback, Brian Dietz, Matt McDaniel
2018, Report
No abstract available....
Model methodology for estimating pesticide concentration extremes based on sparse monitoring data
Aldo V. Vecchia
2018, Scientific Investigations Report 2017-5159
This report describes a new methodology for using sparse (weekly or less frequent observations) and potentially highly censored pesticide monitoring data to simulate daily pesticide concentrations and associated quantities used for acute and chronic exposure assessments, such as the annual maximum daily concentration. The new methodology is based on a...
Natural and man-made hexavalent chromium, Cr(VI), in groundwater near a mapped plume, Hinkley, California—study progress as of May 2017, and a summative-scale approach to estimate background Cr(VI) concentrations
John A. Izbicki, Krishangi D. Groover
2018, Open-File Report 2018-1045
This report describes (1) work done between January 2015 and May 2017 as part of the U.S. Geological Survey (USGS) hexavalent chromium, Cr(VI), background study and (2) the summative-scale approach to be used to estimate the extent of anthropogenic (man-made) Cr(VI) and background Cr(VI) concentrations near the Pacific Gas and...
Intraspecific niche models for ponderosa pine (Pinus ponderosa) suggest potential variability in population-level response to climate change
Kaitlin C. Maguire, Douglas J. Shinneman, Kevin M. Potter, Valerie D. Hipkins
2018, Systematic Biology (67) 965-978
Unique responses to climate change can occur across intraspecific levels, resulting in individualistic adaptation or movement patterns among populations within a given species. Thus, the need to model potential responses among genetically distinct populations within a species is increasingly recognized. However, predictive models of future distributions are regularly fit at...
Delineation of the hydrogeologic framework of the Big Sioux aquifer near Sioux Falls, South Dakota, using airborne electromagnetic data
Kristen J. Valseth, Gregory C. Delzer, Curtis V. Price
2018, Scientific Investigations Map 3393
The U.S. Geological Survey, in cooperation with the City of Sioux Falls, South Dakota, began developing a groundwater-flow model of the Big Sioux aquifer in 2014 that will enable the City to make more informed water management decisions, such as delineation of areas of the greatest specific yield, which is...
Experimental whole-lake dissolved organic carbon increase alters fish diet and density but not growth or productivity
Shuntaro Koizumi, Nicola Craig, Jacob A. Zwart, Patrick T. Kelly, Jacob P. Ziegler, Brian Weidel, Stuart E. Jones, Christopher T. Solomon
2018, Canadian Journal of Fisheries and Aquatic Sciences (75) 1859-1867
Negative relationships between dissolved organic carbon (DOC) concentration and fish productivity have been reported from correlative studies across lakes, but to date there have not been experimental tests of these relationships. We increased the DOC concentration in a lake by 3.4 mg L-1, using a before-after control-impact (BACI) design, to...
Developing Foram-AMBI for biomonitoring in the Mediterranean: Species assignments to ecological categories
Frans Jorissen, Maria P. Nardelli, Ahuva Almogi-Labin, Christine Barras, Luisa Bergamin, Erica Bicchi, Akram El Kateb, Luciana Ferraro, Mary McGann, Caterina Morigi, Elena Romano, Anna Sabattini, Magali Schweizer, Silvia Spezzaferri
2018, Marine Micropaleontology (140) 33-45
Most environmental bio-monitoring methods using the species composition of marine faunas define the Ecological Quality Status of soft bottom ecosystems based on the relative proportions of species assigned to a limited number of ecological categories. In this study we analyse the distribution patterns...
Importance of growth rate on mercury and polychlorinated biphenyl bioaccumulation in fish
Jiajia Li, G. Douglas Haffner, Gordon Patterson, David M. Walters, Michael D. Burtnyk, Ken G. Drouillard
2018, Environmental Toxicology and Chemistry (37) 1655-1667
To evaluate the effect of fish growth on mercury (Hg) and polychlorinated biphenyl (PCB) bioaccumulation, a non–steady‐state toxicokinetic model, combined with a Wisconsin bioenergetics model, was developed to simulate Hg and PCB bioaccumulation in bluegill (Lepomis macrochirus). The model was validated by comparing observed with predicted Hg and PCB 180...
Annual variation in polychlorinated biphenyl (PCB) exposure in tree swallow (Tachycineta bicolor) eggs and nestlings at Great Lakes Restoration Initiative (GLRI) study sites
Christine M. Custer, Thomas W. Custer, Paul M. Dummer, Diana R. Goldberg, J. Christian Franson
2018, Environmental Monitoring and Assessment (190) 1-7
Tree swallow (Tachycineta bicolor) eggs and nestlings were collected from 16 sites across the Great Lakes to quantify normal annual variation in total polychlorinated biphenyl (PCB) exposure and to validate the sample size choice in earlier work. A sample size of five eggs or five nestlings per site...
Tributyltin: Advancing the science on assessing endocrine disruption with an unconventional endocrine-disrupting compound
Laurent Lagadic, Ioanna Katsiadaki, Ronald C. Biever, Patrick Guiney, Natalie Karouna-Renier, Tamar Schwarz, James P. Meador
2018, Book chapter, Reviews of environmental contamination and toxicology Volume 245
Tributyltin (TBT) has been recognized as an endocrine disrupting chemical (EDC) for several decades. However, only in the last decade, was its primary endocrine mechanism of action (MeOA) elucidated—interactions with the nuclear retinoid-X receptor (RXR), peroxisome proliferator-activated receptor γ (PPARγ), and their heterodimers. This molecular initiating event (MIE) alters a...
Nitrogen concentrations and loads for the Connecticut River at Middle Haddam, Connecticut, computed with the use of autosampling and continuous measurements of water quality for water years 2009 to 2014
John R. Mullaney, Joseph W. Martin, Jonathan Morrison
2018, Scientific Investigations Report 2018-5006
The daily and annual loads of nitrate plus nitrite and total nitrogen for the Connecticut River at Middle Haddam, Connecticut, were determined for water years 2009 to 2014. The analysis was done with a combination of methods, which included a predefined rating curve method for nitrate plus nitrite and total...
Synthesis of tree swallow (Tachycineta bicolor) data for Beneficial Use Impairment (BUI) assessment at Wisconsin Areas of Concern
Christine M. Custer, Thomas W. Custer, Paul M. Dummer
2018, Open-File Report 2018-1032
Assessment of the “Bird or Animal Deformities or Reproductive Problems” Beneficial Use Impairment (BUI) can be accomplished by (1) comparing tissue concentrations to established background and Lowest Observable Effect Level (LOEL) for reproductive effects, or (2) directly measuring reproductive success at Areas of Concern (AOCs) and statistically comparing those rates...
Vegetation influences on infiltration in Hawaiian soils
Kimberlie Perkins, Jonathan D. Stock, John R. Nimmo
2018, Ecohydrology (11)
Changes in vegetation communities caused by removing trees, introducing grazing ungulates, and replacing native plants with invasive species have substantially altered soil infiltration processes and rates in Hawaii. These changes directly impact run-off, erosion, plant-available water, and aquifer recharge. We hypothesize that broad vegetation communities can be characterized by distributions...
Tagging and tracking
Michelle E. Lander, Andrew J. Westgate, Brian C. Balmer, James P. Reid, Michael J. Murray, Kristen L. Laidre
2018, Book chapter, CRC handbook of marine mammal medicine, 3rd edition
The number of stranding response facilities for marine mammals in the United States has increased over the past two decades, resulting in thousands of rehabilitated marine mammals released back into the wild (Geraci and Lounsbury 2005; Moore et al. 2007; Johnson and Mayer 2015; Simeone et al. 2015). All rehabilitated...
