Use of flux and morphologic sediment budgets for sandbar monitoring on the Colorado River in Marble Canyon, Arizona
Paul E. Grams, Daniel D. Buscombe, David J. Topping, Joseph E. Hazel Jr., Matt Kaplinski
2015, Conference Paper, Proceedings of the joint federal interagency conference 2015
The magnitude and pfattern of streamflow and sediment supply of the Colorado River in Grand Canyon (Figure 1) has been affected by the existence and operations of Glen Canyon Dam since filling of Lake Powell Reservoir began in March 1963. In the subsequent 30 years, fine sediment was scoured from...
Lake formation, characteristics and evolution in retroarc deposystems: A synthesis of data from the modern Andean orogen and its associated basins
Andrew S. Cohen, Michael M. McGlue, Geoffrey S. Ellis, Hiran Zani, Peter W. Swarzenski, Mario L. Assine, Aguinaldo Silva
Peter G. DeCelles, Mihai N. Ducea, Barbara Carrapa, Paul Kapp, editor(s)
2015, Book chapter, Geodynamic of a cordilleran orogenic system: The central Andes of Argentina and northern Chile
Lake deposystems are commonly associated with retroarc mountain belts in the geological record. These deposystems are poorly characterized in modern retroarcs, placing limits on our ability to interpret environmental signals from ancient deposits. To address this problem, we have synthesized our existing knowledge about the distribution, morphometrics, and sedimentary geochemical...
Cenozoic stratigraphy and structure of the Chesapeake Bay region
David S. Powars, Lucy E. Edwards, Susan M. Kidwell, J. Stephen Schindler
2015, Book
The Salisbury embayment is a broad tectonic downwarp that is filled by generally seaward-thickening, wedge-shaped deposits of the central Atlantic Coastal Plain. Our two-day field trip will take us to the western side of this embayment from the Fall Zone in Washington, D.C., to some of the bluffs along Aquia...
Hydrothermal, biogenic, and seawater components in metalliferous black shales of the Brooks Range, Alaska: Synsedimentary metal enrichment in a carbonate ramp setting
John F. Slack, David Selby, Julie A. Dumoulin
2015, Economic Geology (110) 653-675
Trace element and Os isotope data for Lisburne Group metalliferous black shales of Middle Mississippian (early Chesterian) age in the Brooks Range of northern Alaska suggest that metals were sourced chiefly from local seawater (including biogenic detritus) but also from externally derived hydrothermal fluids. These black shales are interbedded with...
Automated integration of lidar into the LANDFIRE product suite
Birgit Peterson, Kurtis Nelson, Carl Seielstad, Jason M. Stoker, W. Matt Jolly, Russell Parsons
2015, Remote Sensing Letters (6) 247-256
Accurate information about three-dimensional canopy structure and wildland fuel across the landscape is necessary for fire behaviour modelling system predictions. Remotely sensed data are invaluable for assessing these canopy characteristics over large areas; lidar data, in particular, are uniquely suited for quantifying three-dimensional canopy structure. Although lidar data are increasingly...
Truncorotalia crassaformis from its type locality: Comparison with Caribbean plankton and Pliocene relatives
George H. Scott, James C. Ingle Jr., Brendan McCane, Charles L. Powell II, Robert C. Thunell
2015, Marine Micropaleontology (117) 1-12
Truncorotalia crassaformis has been identified in Pliocene-Holocene assemblages globally but there has been little analysis of specimens from its type locality at Lomita Quarry, California. This has led to confusion about some diagnostic criteria, particularly the presence of a peripheral keel. To better understand variation specimens are studied from the type...
The Snowmastodon Project: A view of the Last Interglacial Period from high in the Colorado Rockies
Jeffery S. Pigati
2015, Conference Paper, Mojave Miocene: 15 Million Years of History—2015 Desert Symposium Field Guide and Proceedings
In North America, terrestrial records of biodiversity and climate change that span the Last Interglacial Period [or Marine Oxygen Isotope Stage (MIS) 5] are rare. In 2010-11, construction at Ziegler Reservoir near Snowmass Village, Colorado revealed a lacustrine/wetland sedimentary sequence that preserved evidence of past plant communities between ~140 and...
Potential nitrogen critical loads for northern Great Plains grassland vegetation
Amy J. Symstad, Anine T. Smith, Wesley E. Newton, Alan K. Knapp
2015, Natural Resource Report NPS/NGPN/NRR - 2015/989
The National Park Service is concerned that increasing atmospheric nitrogen deposition caused by fossil fuel combustion and agricultural activities could adversely affect the northern Great Plains (NGP) ecosystems in its trust. The critical load concept facilitates communication between scientists and policy makers or land managers by translating the complex effects...
An ignimbrite caldera from the bottom up: Exhumed floor and fill of the resurgent Bonanza caldera, Southern Rocky Mountain volcanic field, Colorado
Peter W. Lipman, Matthew J. Zimmerer, William C. McIntosh
2015, Geosphere (11) 1902-1947
Among large ignimbrites, the Bonanza Tuff and its source caldera in the Southern Rocky Mountain volcanic field display diverse depositional and structural features that provide special insights concerning eruptive processes and caldera development. In contrast to the nested loci for successive ignimbrite eruptions at many large multicyclic calderas elsewhere, Bonanza...
Tsunami geology in paleoseismology
Yuichi Nishimura, Bruce E. Jaffe
2015, Report, The Contribution of Palaeoseismology to Seismic Hazard Assessment in Site Evaluation for Nuclear Installations
The 2004 Indian Ocean and 2011 Tohoku-oki disasters dramatically demonstrated the destructiveness and deadliness of tsunamis. For the assessment of future risk posed by tsunamis it is necessary to understand past tsunami events. Recent work on tsunami deposits has provided new information on paleotsunami events, including their recurrence interval and...
Preface
J. Wright Horton Jr., Martin C. Chapman, Russell A. Green
2015, Geological Society of America Special Papers (509) vii-vii
This book grew out of a topical session on “Central Virginia Earthquakes of 2011: Geology, Geophysics, and Significance for Seismic Hazards in Eastern North America” at the 2012 The Geological Society of America (GSA) Annual Meeting in Charlotte, North Carolina (USA). It also benefitted from related sessions...
Lake Ontario benthic prey fish assessment, 2014
Brian Weidel, Maureen Walsh
2015, Report, 2014 Annual Report Bureau of Fisheries Lake Ontario Unit and St. Lawrence River Unit to the Great Lakes Fishery Commission’s Lake Ontario Committee
Benthic prey fishes are an important component of the Lake Ontario fish community and serve as vectors that move energy from benthic invertebrates into native and introduced sport fishes. Since the 1970’s, the USGS Lake Ontario Biological Station has assessed benthic fish populations and community dynamics with bottom trawls at...
Micrometer-scale U–Pb age domains in eucrite zircons, impact re-setting, and the thermal history of the HED parent body
M.D. Hopkins, S.J. Mojzsis, W.F. Bottke, Oleg Abramov
2015, Icarus (245) 367-378
Meteoritic zircons are rare, but some are documented to occur in asteroidal meteorites, including those of the howardite–eucrite–diogenite (HED) achondrite clan (Rubin, A. [1997]. Meteorit. Planet. Sci. 32, 231–247). The HEDs are widely considered to originate from the Asteroid 4 Vesta. Vesta and the other large main belt asteroids record...
An updated conceptual model of Delta Smelt biology: Our evolving understanding of an estuarine fish
Randy Baxter, Larry R. Brown, Gonzalo Castillo, Louise Conrad, Steven D. Culberson, Matthew P. Dekar, Melissa Dekar, Frederick Feyrer, Thaddeus Hunt, Kristopher Jones, Joseph Kirsch, Anke Mueller-Solger, Matthew Nobriga, Steven B. Slater, Ted Sommer, Kelly Souza, Gregg Erickson, Stephanie Fong, Karen Gehrts, Lenny Grimaldo, Bruce Herbold
2015, Technical Report 90
The main purpose of this report is to provide an up-to-date assessment and conceptual model of factors affecting Delta Smelt (Hypomesus transpacificus) throughout its primarily annual life cycle and to demonstrate how this conceptual model can be used for scientific and management purposes. The Delta Smelt is a small estuarine...
The effect of dilution and the use of a post-extraction nucleic acid purification column on the accuracy, precision, and inhibition of environmental DNA samples
Anna M. Mckee, Stephen F. Spear, Todd W. Pierson
2015, Biological Conservation (183) 70-76
Isolation of environmental DNA (eDNA) is an increasingly common method for detecting presence and assessing relative abundance of rare or elusive species in aquatic systems via the isolation of DNA from environmental samples and the amplification of species-specific sequences using quantitative PCR (qPCR). Co-extracted substances that inhibit qPCR can lead...
Climate-induced range contraction of a rare alpine aquatic invertebrate
J. Joseph Giersch, Steve Jordan, Gordon Luikart, Leslie A. Jones, F. Richard Hauer, Clint C. Muhlfeld
2015, Freshwater Science (34) 53-65
Climate warming poses a serious threat to alpine-restricted species worldwide, yet few studies have empirically documented climate-induced changes in distributions. The rare stonefly, Zapada glacier (Baumann and Gaufin), endemic to alpine streams of Glacier National Park (GNP), Montana, was recently petitioned for listing under the US Endangered Species Act because of climate-change-induced...
Migratory behavior of Chinook salmon microjacks reared in artificial and natural environments
Michael C. Hayes, Steve P. Rubin, Reginald R. Reisenbichler, Lisa A. Wetzel
2015, Journal of Fish and Wildlife Management (6) 176-186
Emigration was evaluated for hatchery Chinook salmon (Oncorhynchus tshawytscha) microjacks (age-1 mature males) and immature parr (age-1 juveniles, both sexes) released from both a hatchery and a natural stream (fish released as fry). In the hatchery, volitional releases (∼14 to 15 months post-fertilization) to an adjacent river occurred during October–November....
Development of a spatially universal framework for classifying stream assemblages with application to conservation planning for Great Lakes lotic fish communities
James E. McKenna Jr., Jeffrey S. Schaeffer, Jana S. Stewart, Michael T. Slattery
2015, Restoration Ecology (23) 167-178
Classifications are typically specific to particular issues or areas, leading to patchworks of subjectively defined spatial units. Stream conservation is hindered by the lack of a universal habitat classification system and would benefit from an independent hydrology-guided spatial framework of units encompassing all aquatic habitats at multiple spatial scales within...
Data worth and prediction uncertainty for pesticide transport and fate models in Nebraska and Maryland, United States
Bernard T. Nolan, Robert W. Malone, John E. Doherty, Jack E. Barbash, Liwang Ma, Dale L. Shaner
2015, Pest Management Science (71) 972-985
BACKGROUND Complex environmental models are frequently extrapolated to overcome data limitations in space and time, but quantifying data worth to such models is rarely attempted. The authors determined which field observations most informed the parameters of agricultural system models applied to field sites in Nebraska (NE) and...
The economic viability of smallholder timber production under expanding açaí palm production in the Amazon Estuary
Lucas B. Fortini, Douglas R. Carter
2015, Journal of Forest Economics (20) 223-235
Relatively little attention has been paid to the economic potentials and limitations of tropical timber production and management at smallholder scales, with the most relevant research focusing on community forestry efforts. As a rare tropical example of long-lasting small-scale timber production, in this study we explore the economics of smallholder...
Non-native fishes in Florida freshwaters: a literature review and synthesis
Pamela J. Schofield, William F. Loftus
2015, Reviews in Fish Biology and Fisheries (25) 117-145
Non-native fishes have been known from freshwater ecosystems of Florida since the 1950s, and dozens of species have established self-sustaining populations. Nonetheless, no synthesis of data collected on those species in Florida has been published until now. We searched the literature for peer-reviewed publications reporting original data for 42 species...
Mantle peridotite in newly discovered far-inland subduction complex, southwest Arizona: Initial report
Gordon B. Haxel, Carl E. Jacobson, James H. Wittke
2015, International Geology Review (57) 871-892
The latest Cretaceous to early Palaeogene Orocopia Schist and related units are generally considered a low-angle subduction complex that underlies much of southern California and Arizona. A recently discovered exposure of Orocopia Schist at Cemetery Ridge west of Phoenix, Arizona, lies exceptionally far inland from the continental margin. Unexpectedly, this...
Evidence of low genetic variation and rare alleles in a bottlenecked endangered island endemic, the Lasan Teal (Anas laysanensis)
Michelle H. Reynolds, John M. Pearce, Philip Lavretsky, Peters Jeffrey L, Karen Courtot, Pedro P. Seixas
2015, Technical Report HCSU-063
Genetic diversity is assumed to reflect the evolutionary potential and adaptability of populations, and thus quantifying the genetic diversity of endangered species is useful for recovery programs. In particular, if conservation strategies include reintroductions, periodic genetic assessments are useful to evaluate whether management efforts have resulted in the maximization or...
Relationships between protein-encoding gene abundance and corresponding process are commonly assumed yet rarely observed
Jennifer D. Rocca, Edward K. Hall, Jay T. Lennon, Sarah E. Evans, Mark P. Waldrop, James B. Cotner, Diana R. Nemergut, Emily B. Graham, Matthew D. Wallenstein
2015, The ISME Journal (9) 1693-1699
For any enzyme-catalyzed reaction to occur, the corresponding protein-encoding genes and transcripts are necessary prerequisites. Thus, a positive relationship between the abundance of gene or transcripts and corresponding process rates is often assumed. To test this assumption, we conducted a meta-analysis of the relationships between gene and/or transcript abundances and...
Sedimentology of new fluvial deposits on the Elwha River, Washington, USA, formed during large-scale dam removal
Amy Draut, Andrew C. Ritchie
2015, River Research and Applications (31) 42-61
Removal of two dams 32 m and 64 m high on the Elwha River, Washington, USA, provided the first opportunity to examine river response to a dam removal and controlled sediment influx on such a large scale. Although many recent river-restoration efforts have included dam removal, large dam removals have...
