Soil-test N recommendations augmented with PEST-optimized RZWQM simulations
R.W. Malone, D.B. Jaynes, Liwang Ma, B. T. Nolan, D.W. Meek, D.L. Karlen
2010, Journal of Environmental Quality (39) 1711-1723
Improved understanding of year-to-year late-spring soil nitrate test (LSNT) variability could help make it more attractive to producers. We test the ability of the Root Zone Water Quality Model (RZWQM) to simulate watershed-scale variability due to the LSNT, and we use the optimized model to simulate long-term field N dynamics...
Mapping irrigated lands at 250-m scale by merging MODIS data and National Agricultural Statistics
Md Shahriar Pervez, Jesslyn F. Brown
2010, Remote Sensing (2) 2388-2412
Accurate geospatial information on the extent of irrigated land improves our understanding of agricultural water use, local land surface processes, conservation or depletion of water resources, and components of the hydrologic budget. We have developed a method in a geospatial modeling framework that assimilates irrigation statistics with remotely sensed parameters...
Prey-mediated avoidance of an intraguild predator by its intraguild prey
R.R. Wilson, T.L. Blankenship, M.B. Hooten, J.A. Shivik
2010, Oecologia (164) 921-929
Intraguild (IG) predation is an important factor influencing community structure, yet factors allowing coexistence of IG predator and IG prey are not well understood. The existence of spatial refuges for IG prey has recently been noted for their importance in allowing coexistence. However, reduction in basal prey availability might lead...
Future dryness in the Southwest US and the hydrology of the early 21st century drought
D.R. Cayan, T. Das, D.W. Pierce, T.P. Barnett, Mary Tyree, A. Gershunova
2010, Proceedings of the National Academy of Sciences of the United States of America (107) 21271-21276
Recently the Southwest has experienced a spate of dryness, which presents a challenge to the sustainability of current water use by human and natural systems in the region. In the Colorado River Basin, the early 21st century drought has been the most extreme in over a century of Colorado River...
Analysis of the Arctic system for freshwater cycle intensification: Observations and expectations
M.A. Rawlins, M. Steele, M.M. Holland, J.C. Adam, J.E. Cherry, J.A. Francis, P.Y. Groisman, L. D. Hinzman, T.G. Huntington, D.L. Kane, J.S. Kimball, R. Kwok, R.B. Lammers, C.M. Lee, D.P. Lettenmaier, K.C. McDonald, E. Podest, J.W. Pundsack, B. Rudels, Mark C. Serreze, A. Shiklomanov, O. Skagseth, T.J. Troy, C. J. Vorosmarty, M. Wensnahan, E.F. Wood, R. Woodgate, D. Yang, K. Zhang, T. Zhang
2010, Journal of Climate (23) 5715-5737
Hydrologic cycle intensification is an expected manifestation of a warming climate. Although positive trends in several global average quantities have been reported, no previous studies have documented broad intensification across elements of the Arctic freshwater cycle (FWC). In this study, the authors examine the character and quantitative significance of changes...
Predictions of turbidity due to enhanced sediment resuspension resulting from sea-level rise on a fringing Coral Reef: Evidence from Molokai, Hawaii
A.S. Ogston, M.E. Field
2010, Journal of Coastal Research (26) 1027-1037
Accelerating sea-level rise associated with global climate change will affect sedimentary processes on coral reefs and other shoreline environments by increasing energy and sediment resuspension. On reefs, sedimentation is known to increase coral stress and bleaching as particles that settle on coral surfaces interfere with photosynthesis and feeding, and turbidity...
Inter-regional comparison of land-use effects on stream metabolism
M. J. Bernot, D. J. Sobota, R.O. Hall, P. J. Mulholland, W. K. Dodds, J.R. Webster, J. L. Tank, L. R. Ashkenas, L. W. Cooper, Clifford N. Dahm, S.V. Gregory, N. B. Grimm, S. K. Hamilton, S. L. Johnson, W. H. McDowell, J.L. Meyer, B. Peterson, G. C. Poole, Valett H.M. Maurice, C. Arango, J. J. Beaulieu, A. J. Burgin, C. Crenshaw, A. M. Helton, L. Johnson, J. Merriam, B.R. Niederlehner, J. M. O’Brien, J. D. Potter, R.W. Sheibley, S. M. Thomas, K. Wilson
2010, Freshwater Biology (55) 1874-1890
1. Rates of whole-system metabolism (production and respiration) are fundamental indicators of ecosystem structure and function. Although first-order, proximal controls are well understood, assessments of the interactions between proximal controls and distal controls, such as land use and geographic region, are lacking. Thus, the influence of land use on stream...
Assessment of undiscovered conventional oil and gas resources, onshore Claiborne Group, United Statespart of the northern Gulf of Mexico Basin
P.C. Hackley, T.E. Ewing
2010, American Association of Petroleum Geologists Bulletin (94) 1607-1636
The middle Eocene Claiborne Group was assessed for undiscovered conventional hydrocarbon resources using established U.S. Geological Survey assessment methodology. This work was conducted as part of a 2007 assessment of Paleogene-Neogene strata of the northern Gulf of Mexico Basin, including the United States onshore and state waters (Dubiel et al.,...
Hurricane storm surge and amphibian communities in coastal wetlands of northwestern Florida
Margaret S. Gunzburger, William B. Hughes, William J. Barichivich, Jennifer S. Staiger
2010, Wetlands Ecology and Management (18) 651-663
Isolated wetlands in the Southeastern United States are dynamic habitats subject to fluctuating environmental conditions. Wetlands located near marine environments are subject to alterations in water chemistry due to storm surge during hurricanes. The objective of our study was to evaluate the effect of storm surge overwash on wetland amphibian...
Potential environmental influences on variation in body size and sexual size dimorphism among Arizona populations of the western diamond-backed rattlesnake (Crotalus atrox)
Melissa Amarello, Erica M. Nowak, Emily N. Taylor, Gordon W. Schuett, Roger A. Repp, Philip C. Rosen, David L. Hardy Sr.
2010, Journal of Arid Environments (74) 1443-1449
Differences in resource availability and quality along environmental gradients are important influences contributing to intraspecific variation in body size, which influences numerous life-history traits. Here, we examined variation in body size and sexual size dimorphism (SSD) in relation to temperature, seasonality, and precipitation among 10 populations located throughout Arizona of...
Comparison of watershed disturbance predictive models for stream benthic macroinvertebrates for three distinct ecoregions in western US
Ian R. Waite, Larry R. Brown, Jonathan G. Kennen, Jason T. May, Thomas F. Cuffney, James L. Orlando, Kimberly A. Jones
2010, Ecological Indicators (10) 1125-1136
The successful use of macroinvertebrates as indicators of stream condition in bioassessments has led to heightened interest throughout the scientific community in the prediction of stream condition. For example, predictive models are increasingly being developed that use measures of watershed disturbance, including urban and agricultural land-use, as explanatory variables to...
Report of the COSPAR mars special regions colloquium
G. Kminek, J.D. Rummel, C.S. Cockell, R. Atlas, N. Barlow, D. Beaty, W. Boynton, M. Carr, S. Clifford, C.A. Conley, A.F. Davila, A. Debus, P. Doran, M. Hecht, J. Heldmann, J. Helbert, V. Hipkin, G. Horneck, Thomas L. Kieft, G. Klingelhoefer, M. Meyer, H. Newsom, G.G. Ori, J. Parnell, D. Prieur, F. Raulin, D. Schulze-Makuch, J.A. Spry, P.E. Stabekis, E. Stackebrandt, J. Vago, M. Viso, M. Voytek, L. Wells, F. Westall
2010, Advances in Space Research (46) 811-829
In this paper we present the findings of a COSPAR Mars Special Regions Colloquium held in Rome in 2007. We review and discuss the definition of Mars Special Regions, the physical parameters used to define Mars Special Regions, and physical features on Mars that can be interpreted as Mars Special...
Genetic characterization of Neotropical Jabiru Storks: Insights for conservation
I.F. Lopes, S. M. Haig, S.N.D. Lama
2010, Waterbirds (33) 425-437
Jabiru Stork (Jabiru mycteria is listed under Appendix I of CITES and considered threatened in Central America. The first population genetic analysis of Jabiru Storks was carried out using mitochondrial DNA (mtDNA) control region sequences (520 bp) and five heterologous microsatellite loci. Samples were collected from the field (N =...
Micromorphology and stable-isotope geochemistry of historical pedogenic siderite formed in PAH-contaminated alluvial clay soils, Tennessee, U.S.A
S.G. Driese, Greg A. Ludvigson, J.A. Roberts, D.A. Fowle, Luis A. Gonzalez, J.J. Smith, V.M. Vulava, L.D. McKay
2010, Journal of Sedimentary Research (80) 943-954
Alluvial clay soil samples from six boreholes advanced to depths of 400-450 cm (top of limestone bedrock) from the Chattanooga Coke Plant (CCP) site were examined micromorphologically and geochemically in order to determine if pedogenic siderite (FeCO3) was present and whether siderite occurrence was related to organic contaminant distribution. Samples...
Growth, condition factor, and bioenergetics modeling link warmer stream temperatures below a small dam to reduced performance of juvenile steelhead
S.T. Sauter, P.J. Connolly
2010, Northwest Science (84) 369-377
We investigated the growth and feeding performance of juvenile steelhead Oncorhynchus mykiss using field measures and bioenergetics modeling. Juvenile steelhead populations were sampled from mid-June through August 2004 at study sites upstream and downstream of Hemlock Dam. The growth and diet of juvenile steelhead were determined for a warm (summer)...
Closure to "computing nonhydrostatic shallow-water flow over steep terrain" by Roger P. Denlinger and Daniel R. H. O'Connell
Roger P. Denlinger, D. H. O’Connell
2010, Journal of Hydraulic Engineering (137) 141-142
No abstract available....
Using noble gases measured in spring discharge to trace hydrothermal processes in the Norris Geyser Basin, Yellowstone National Park, U.S.A.
W.P. Gardner, D. D. Susong, D. K. Solomon, H.P. Heasler
2010, Journal of Volcanology and Geothermal Research (198) 394-404
Dissolved noble gas concentrations in springs are used to investigate boiling of hydrothermal water and mixing of hydrothermal and shallow cool water in the Norris Geyser Basin area. Noble gas concentrations in water are modeled for single stage and continuous steam removal. Limitations on boiling using noble gas concentrations are...
Simulation and analysis of conjunctive use with MODFLOW's farm process
R. T. Hanson, W. Schmid, C.C. Faunt, B. Lockwood
2010, Ground Water (48) 674-689
The extension of MODFLOW onto the landscape with the Farm Process (MF-FMP) facilitates fully coupled simulation of the use and movement of water from precipitation, streamflow and runoff, groundwater flow, and consumption by natural and agricultural vegetation throughout the hydrologic system at all times. This allows for more complete analysis...
A methodology for ecosystem-scale modeling of selenium
Theresa S. Presser, Samuel N. Luoma
2010, Integrated Environmental Assessment and Management (6) 685-710
The main route of exposure for selenium (Se) is dietary, yet regulations lack biologically based protocols for evaluations of risk. We propose here an ecosystem-scale model that conceptualizes and quantifies the variables that determinehow Se is processed from water through diet to predators. This approach uses biogeochemical and physiological factors...
The tail of the Storegga Slide: Insights from the geochemistry and sedimentology of the Norwegian Basin deposits
C. K. Paull, W. Ussler III, W.S. Holbrook, T.M. Hill, H. Haflidason, W. Winters, T. Lorenson, I. Aiello, J.E. Johnson, E. Lundsten
2010, Sedimentology (57) 1409-1429
Deposits within the floor of the Norwegian Basin were sampled to characterize the deposition from the Storegga Slide, the largest known Holocene-aged continental margin slope failure complex. A 29 to 67 cm thick veneer of variable-coloured, finely layered Holocene sediment caps a homogeneous, extremely well-sorted, poorly consolidated, very fine-grained, grey-coloured...
Response of Colorado river runoff to dust radiative forcing in snow
T. H. Painter, J.S. Deems, J. Belnap, A.F. Hamlet, C. C. Landry, B. Udall
2010, Proceedings of the National Academy of Sciences of the United States of America (107) 17125-17130
The waters of the Colorado River serve 27 million people in seven states and two countries but are overallocated by more than 10% of the river's historical mean. Climate models project runoff losses of 7-20% from the basin in this century due to human-induced climate change. Recent work has shown...
Bottom-up factors influencing riparian willow recovery in Yellowstone National Park
M.T. Tercek, R. Stottlemyer, R. Renkin
2010, Western North American Naturalist (70) 387-399
After the elimination of wolves (Canis lupis L.) in the 1920s, woody riparian plant communities on the northern range of Yellowstone National Park (YNP) declined an estimated 50%. After the reintroduction of wolves in 19951996, riparian willows (Salix spp.) on YNP's northern range showed significant growth for the first time...
Late Hesperian plains formation and degradation in a low sedimentation zone of the northern lowlands of Mars
J.A.P. Rodriguez, K. L. Tanaka, D.C. Berman, J.S. Kargel
2010, Icarus (210) 116-134
The plains materials that form the martian northern lowlands suggest large-scale sedimentation in this part of the planet. The general view is that these sedimentary materials were transported from zones of highland erosion via outflow channels and other fluvial systems. The study region, the northern circum-polar plains south of Gemini...
Potential contributions of asphalt and coal tar to black carbon quantification in urban dust, soils, and sediments
Y. Yang, B.J. Mahler, P. C. Van Metre, B. Ligouis, C.J. Werth
2010, Geochimica et Cosmochimica Acta (74) 6830-6840
Measurements of black carbon (BC) using either chemical or thermal oxidation methods are generally thought to indicate the amount of char and/or soot present in a sample. In urban environments, however, asphalt and coal-tar particles worn from pavement are ubiquitous and, because of their pyrogenic origin, could contribute to measurements...
Using multiple chemical indicators to characterize and determine the age of groundwater from selected vents of the silver springs group, Central Florida, USA
L. Knowles Jr., B. G. Katz, D. J. Toth
2010, Hydrogeology Journal (18) 1825-1838
The Silver Springs Group, Florida (USA), forms the headwaters of the Silver River and supports a diverse ecosystem. The 30 headwater springs divide into five subgroups based on chemistry. Five selected spring vents were sampled in 2007 to better understand the contaminant sources and groundwater flow system. Elevated nitrate-N concentrations...
