A fine-scale assessment of using barriers to conserve native stream salmonids: a case study in Akokala Creek, Glacier National Park, USA
Clint C. Muhlfeld, Vincent S. D'Angelo, S.T. Kalinowski, Erin L. Landguth, C.C. Downs, J. Tohtz, Jeffrey L. Kershner
2012, Open Fish Science Journal (5) 9-20
Biologists are often faced with the difficult decision in managing native salmonids of where and when to install barriers as a conservation action to prevent upstream invasion of nonnative fishes. However, fine-scale approaches to assess long-term persistence of populations within streams and watersheds chosen for isolation management are often lacking....
Geostatistical population-mixture approach to unconventional-resource assessment with an application to the Woodford Gas Shale, Arkoma Basin, eastern Oklahoma
Ricardo A. Olea, Ronald Charpentier, Troy A. Cook, David W. Houseknecht, Christopher P. Garrity
David W. Houseknecht, Ronald R. Charpentier, editor(s)
2012, SPE Reservoir Evaluation & Engineering (15) 554-562
Evaluation of resources such as tight sands and gas shales requires the formulation of assessment models that are different from those used for the inference of conventional resources. Formulations in present use are based in classical statistics that ignore the partly organized and partly random geographical variation of attributes related...
Spatiotemporal analysis of black spruce forest soils and implications for the fate of C
Jennifer W. Harden, Kristen L. Manies, Jonathan O'Donnell, Kristofer Johnson, Steve Frolking, Zhaosheng Fan
2012, Journal of Geophysical Research (117)
Post-fire storage of carbon (C) in organic-soil horizons was measured in one Canadian and three Alaskan chronosequences in black spruce forests, together spanning stand ages of nearly 200 yrs. We used a simple mass balance model to derive estimates of inputs, losses, and accumulation rates of C on timescales of...
The effects of permafrost thaw on soil hydrologic, thermal, and carbon dynamics in an Alaskan peatland
Jonathan A. O’Donnell, M. Torre Jorgenson, Jennifer W. Harden, A. David McGuire, Mikhail Z. Kanevskiy, Kimberly P. Wickland
2012, Ecosystems (15) 213-229
Recent warming at high-latitudes has accelerated permafrost thaw in northern peatlands, and thaw can have profound effects on local hydrology and ecosystem carbon balance. To assess the impact of permafrost thaw on soil organic carbon (OC) dynamics, we measured soil hydrologic and thermal dynamics and soil OC stocks across a...
On modeling weak sinks in MODPATH
Daniel B. Abrams, Henk Haitjema, Leon J. Kauffman
2012, Ground Water (51) 597-602
Regional groundwater flow systems often contain both strong sinks and weak sinks. A strong sink extracts water from the entire aquifer depth, while a weak sink lets some water pass underneath or over the actual sink. The numerical groundwater flow model MODFLOW may allow a sink cell to act as...
Bacterial and enchytraeid abundance accelerate soil carbon turnover along a lowland vegetation gradient in interior Alaska
M. P. Waldrop, Jennifer W. Harden, M.R. Turetsky, D.G. Petersen, A. D. McGuire, M.J.I. Briones, A.C. Churchill, D.H. Doctor, L.E. Pruett
2012, Soil Biology and Biochemistry (50) 188-198
Boreal wetlands are characterized by a mosaic of plant communities, including forests, shrublands, grasslands, and fens, which are structured largely by changes in topography and water table position. The soil associated with these plant communities contain quantitatively and qualitatively different forms of soil organic matter (SOM) and nutrient availability that...
Root zone water quality model (RZWQM2): Model use, calibration and validation
Liwang Ma, Lajpat Ahuja, B. T. Nolan, Robert Malone, Thomas Trout, Z. Qi
2012, Transactions of the ASABE (55) 1425-1446
The Root Zone Water Quality Model (RZWQM2) has been used widely for simulating agricultural management effects on crop production and soil and water quality. Although it is a one-dimensional model, it has many desirable features for the modeling community. This article outlines the principles of calibrating the model component by...
The current state of modeling
Randall J. Hunt, Chunmiao Zheng
2012, Ground Water (50) 329-333
No abstract available....
The science, information, and engineering needed to manage water availability and quality in 2050
Robert M. Hirsch
2012, Book chapter, Toward a sustainable water future: Visions for 2050
This chapter explores four water resources issues: 1) hydrologic variability, hazards, water supply and ecosystem preservation; 2) urban landscape design; 3) non-point source water quality, and 4) climate change, resiliency, and nonstationarity. It also considers what science, technology, and engineering practice may be needed in the coming decades to...
An exploratory investigation of the landscape-lake interface: Land cover controls over consumer N and C isotopic composition in Lake Michigan rivermouths
James H. Larson, William B. Richardson, Jonathan M. Vallazza, J. C. Nelson
2012, Journal of Great Lakes Research (38) 610-619
Rivermouth ecosystems are areas where tributary waters mix with lentic near-shore waters and provide habitat for many Laurentian Great Lakes fish and wildlife species. Rivermouths are the interface between terrestrial activities that influence rivers and the ecologically important nearshore. Stable isotopes of nitrogen (N) and carbon (C) in consumers were...
Using hydrogeology to identify the source of groundwater to Montezuma Well, a natural spring in central Arizona: part 1
Raymond H. Johnson, Ed H. DeWitt, L. Rick Arnold
2012, Environmental Earth Sciences (67) 1821-1835
Montezuma Well is a natural spring located within a “sinkhole” in the desert environment of the Verde Valley in Central Arizona. It is managed by the National Park Service as part of Montezuma Castle National Monument. Because of increasing development of groundwater in the area, this research was undertaken to...
Synthesis of benthic flux components in the Patos Lagooncoastal zone, Rio Grande do Sul, Brazil
Jeffrey N. King
2012, Water Resources Research (48)
The primary objective of this work is to synthesize components of benthic flux in the Patos Lagoon coastal zone, Rio Grande do Sul, Brazil. Specifically, the component of benthic discharge flux forced by the terrestrial hydraulic gradient is 0.8 m3 d-1; components of benthic discharge and recharge flux associated with...
Sulfur, carbon, hydrogen, and oxygen isotope geochemistry of the Idaho cobalt belt
Craig A. Johnson, Arthur A. Bookstrom, John F. Slack
2012, Economic Geology (107) 1207-1221
Cobalt-copper ± gold deposits of the Idaho cobalt belt, including the deposits of the Blackbird district, have been analyzed for their sulfur, carbon, hydrogen, and oxygen isotope compositions to improve the understanding of ore formation. Previous genetic hypotheses have ranged widely, linking the ores to the sedimentary or diagenetic history...
Pacific salmon (Oncorhynchus spp.) runs and consumer fitness: growth and energy storage in stream-dwelling salmonids increase with salmon spawner density
Daniel J. Rinella, Mark S. Wipfli, Craig A. Stricker, Ron A. Heintz, Matthew J. Rinella
2012, Canadian Journal of Fisheries and Aquatic Sciences (69) 73-84
We examined how marine-derived nutrients (MDN), in the form of spawning Pacific salmon, influenced the nutritional status and δ15N of stream-dwelling fishes. We sampled juvenile coho salmon (Oncorhynchus kisutch) and Dolly Varden (Salvelinus malma) during spring and fall from 11 south-central Alaskan streams that ranged widely in spawning salmon biomass...
Petroleum prospectivity of the Canada Basin, Arctic Ocean
Arthur Grantz, Patrick E. Hart
2012, Marine and Petroleum Geology (30) 126-143
Reconnaissance seismic reflection data indicate that Canada Basin is a >700,000 sq. km. remnant of the Amerasia Basin of the Arctic Ocean that lies south of the Alpha-Mendeleev Large Igneous Province, which was constructed across the northern part of the Amerasia Basin between about 127 and 89–83.5 Ma. Canada Basin...
A generalized model for estimating the energy density of invertebrates
Daniel A. James, Isak J. Csargo, Aaron Von Eschen, Megan D. Thul, James M. Baker, Cari-Ann Hayer, Jessica Howell, Jacob Krause, Alex Letvin, Steven R. Chipps
2012, Freshwater Science (31) 69-77
Invertebrate energy density (ED) values are traditionally measured using bomb calorimetry. However, many researchers rely on a few published literature sources to obtain ED values because of time and sampling constraints on measuring ED with bomb calorimetry. Literature values often do not account for spatial or temporal variability associated with...
Large submarine sand waves and gravel lag substrates on Georges Bank off Atlantic Canada
B.J. Todd, Page C. Valentine
Peter T Harris, E.K. Baker, editor(s)
2012, Book chapter, Seafloor geomorphology as benthic habitat: GeoHab atlas of seafloor geomorphic features and benthic habitats,
Georges Bank is a large, shallow, continental shelf feature offshore of New England and Atlantic Canada. The bank is mantled with a veneer of glacial debris transported during the late Pleistocene from continental areas lying to the north. These sediments were reworked by marine processes during postglacial sea-level transgression and...
Ordovician of the Sauk megasequence in the Ozark region of northern Arkansas and parts of Missouri and adjacent states
Raymond L. Ethington, John E. Repetski, James R. Derby
2012, AAPG Memoir (98) 275-300
Exposures of Ordovician rocks of the Sauk megasequence in Missouri and northern Arkansas comprise Ibexian and lower Whiterockian carbonates with interspersed sandstones. Subjacent Cambrian strata are exposed in Missouri but confined to the subsurface in Arkansas. The Sauk-Tippecanoe boundary in this region is at the base of the St. Peter...
Selection of nest-site habitat by interior least terns in relation to sandbar construction
M. H. Sherfy, J. H. Stucker, D. A. Buhl
2012, Journal of Wildlife Management (76) 363-371
Federally endangered interior least terns (Sternula antillarum) nest on bare or sparsely vegetated sandbars on midcontinent river systems. Loss of nesting habitat has been implicated as a cause of population declines, and managing these habitats is a major initiative in population recovery. One such initiative involves construction of mid-channel sandbars...
Reproductive endocrine disruption in smallmouth bass (Micropterus dolomieu) in the Potomac River basin: spatial and temporal comparisons of biological effects
Vicki Blazer, Luke R. Iwanowicz, Holly Henderson, Patricia M. Mazik, Jill A. Jenkins, David A. Alvarez, John A. Young
2012, Environmental Monitoring and Assessment (184) 4309-4334
A high prevalence of intersex or testicular oocytes (TO) in male smallmouth bass within the Potomac River drainage has raised concerns as to the health of the river. Studies were conducted to document biomarker responses both temporally and spatially to better understand the influence of normal physiological cycles, as well...
Patterns of metal composition and biological condition and their association in male common carp across an environmental contaminant gradient in Lake Mead National Recreation Area, Nevada and Arizona, USA
Reynaldo Patino, Michael R. Rosen, E.L. Orsak, Steven L. Goodbred, Thomas W. May, David A. Alvarez, Kathy R. Echols, Carla M. Wieser, Shane Ruessler, L. Torres
2012, Science of the Total Environment (416) 215-224
There is a contaminant gradient in Lake Mead National Recreation Area (LMNRA) that is partly driven by municipal and industrial runoff and wastewater inputs via Las Vegas Wash (LVW). Adult male common carp (Cyprinus carpio; 10 fish/site) were collected from LVW, Las Vegas Bay (receiving LVW flow), Overton Arm (OA,...
Geostatistical modeling of the gas emission zone and its in-place gas content for Pittsburgh-seam mines using sequential Gaussian simulation
Cevat O. Karacan, Ricardo A. Olea, G. Goodman
2012, International Journal of Coal Geology (90-91) 50-71
Determination of the size of the gas emission zone, the locations of gas sources within, and especially the amount of gas retained in those zones is one of the most important steps for designing a successful methane control strategy and an efficient ventilation system in...
Digital outcrop model of stratigraphy and breccias of the southern Franklin Mountains, El Paso, Texas
Jerome A. Bellian, Charles Kerans, John E. Repetski
James R. Derby, R.D. Fritz, S.A. Longacre, W.A. Morgan, C.A. Sternbach, editor(s)
2012, Book chapter, The great American carbonate bank: The geology and economic resources of the Cambrian-Ordovician Sauk megasequence of Laurentia
This chapter reviews and synthesizes the lithostratigraphy, biostratigraphy, chronostratigraphy, and breccia types of the southwestern part of the great American carbonate bank in the southern Franklin Mountains (SFM), El Paso, Texas. Primary stratigraphic units of focus are the Lower Ordovician El Paso and Upper Ordovician Montoya Groups. These groups preserve...
Statistical analyses to support guidelines for marine avian sampling. Final report
Brian P. Kinlan, Elise Zipkin, Allan F. O’Connell, Chris Caldow
2012, NOAA Technical Memorandum NOS NCCOS 158
Interest in development of offshore renewable energy facilities has led to a need for high-quality, statistically robust information on marine wildlife distributions. A practical approach is described to estimate the amount of sampling effort required to have sufficient statistical power to identify species-specific “hotspots” and “coldspots” of marine bird abundance...
Synthesis study of an erosion hot spot, Ocean Beach, California
Patrick L. Barnard, Jeff E. Hansen, Li H. Erikson
2012, Journal of Coastal Research (28) 903-922
A synthesis of multiple coastal morphodynamic research efforts is presented to identify the processes responsible for persistent erosion along a 1-km segment of 7-km-long Ocean Beach in San Francisco, California. The beach is situated adjacent to a major tidal inlet and in the shadow of the ebb-tidal delta at the...
