Nitrogen and phosphorus in the Upper Mississippi River: Transport, processing, and effects on the river ecosystem
J.N. Houser, W. B. Richardson
2010, Hydrobiologia (640) 71-88
Existing research on nutrients (nitrogen and phosphorus) in the Upper Mississippi River (UMR) can be organized into the following categories: (1) Long-term changes in nutrient concentrations and export, and their causes; (2) Nutrient cycling within the river; (3) Spatial and temporal patterns of river nutrient concentrations; (4) Effects of elevated...
Population-level resource selection by sympatric brown and American black bears in Alaska
Jerrold L. Belant, Brad Griffith, Yingte Zhang, Erich H. Follmann, Layne G. Adams
2010, Polar Biology (33) 31-40
Distribution theory predicts that for two species living in sympatry, the subordinate species would be constrained from using the most suitable resources (e.g., habitat), resulting in its use of less suitable habitat and spatial segregation between species. We used negative binomial generalized linear mixed models with fixed effects to estimate...
Longitudinal differences in habitat complexity and fish assemblage structure of a great plains river
J.L. Eitzmann, C.P. Paukert
2010, American Midland Naturalist (163) 14-32
We investigated the spatial variation in the Kansas River (USA) fish assemblage to determine how fish community structure changes with habitat complexity in a large river. Fishes were collected at ten sites throughout the Kansas River for assessing assemblage structure in summer 2007. Aerial imagery indicated riparian land use within...
Night sampling improves indices used for management of yellow perch in Lake Erie
P.M. Kocovsky, M.A. Stapanian, C.T. Knight
2010, Fisheries Management and Ecology (17) 10-18
Catch rate (catch per hour) was examined for age-0 and age-1 yellow perch, Perca flavescens (Mitchill), captured in bottom trawls from 1991 to 2005 in western Lake Erie: (1) to examine variation of catch rate among years, seasons, diel periods and their interactions; and (2) to determine whether sampling during...
Design and analysis of simple choice surveys for natural resource management
John Fieberg, Louis Cornicelli, David C. Fulton, Marrett D. Grund
2010, Journal of Wildlife Management (74) 871-879
We used a simple yet powerful method for judging public support for management actions from randomized surveys. We asked respondents to rank choices (representing management regulations under consideration) according to their preference, and we then used discrete choice models to estimate probability of choosing among options (conditional on the set...
Geologie study off gravels of the Agua Fria River, Phoenix, AZ
W. H. Langer, E. Dewitt, D.T. Adams, T. O’Briens
2010, Mining Engineering (62) 27-31
The annual consumption of sand and gravel aggregate in 2006 in the Phoenix, AZ metropolitan area was about 76 Mt (84 million st) (USGS, 2009), or about 18 t (20 st) per capita. Quaternary alluvial deposits in the modern stream channel of the Agua Fria River west of Phoenix are...
The ShakeOut earthquake scenario: Verification of three simulation sets
J. Bielak, R.W. Graves, K.B. Olsen, R. Taborda, L. Ramirez-Guzman, S.M. Day, G.P. Ely, D. Roten, T.H. Jordan, P.J. Maechling, J. Urbanic, Y. Cui, G. Juve
2010, Geophysical Journal International (180) 375-404
This paper presents a verification of three simulations of the ShakeOut scenario, an Mw 7.8 earthquake on a portion of the San Andreas fault in southern California, conducted by three different groups at the Southern California Earthquake Center using the SCEC Community Velocity Model for this region. We conducted two...
Lunar Reconnaissance Orbiter Camera (LROC) instrument overview
M.S. Robinson, S.M. Brylow, M. Tschimmel, D. Humm, S.J. Lawrence, P.C. Thomas, B.W. Denevi, E. Bowman-Cisneros, J. Zerr, M.A. Ravine, M.A. Caplinger, F.T. Ghaemi, J.A. Schaffner, M. C. Malin, P. Mahanti, A. Bartels, J. Anderson, T.N. Tran, E. M. Eliason, A. S. McEwen, E. Turtle, B.L. Jolliff, H. Hiesinger
2010, Space Science Reviews (150) 81-124
The Lunar Reconnaissance Orbiter Camera (LROC) Wide Angle Camera (WAC) and Narrow Angle Cameras (NACs) are on the NASA Lunar Reconnaissance Orbiter (LRO). The WAC is a 7-color push-frame camera (100 and 400 m/pixel visible and UV, respectively), while the two NACs are monochrome narrow-angle linescan imagers (0.5 m/pixel). The...
Quality of the log-geometric distribution extrapolation for smaller undiscovered oil and gas pool size
L. Chenglin, Ronald R. Charpentier
2010, Natural Resources Research (19) 11-21
The U.S. Geological Survey procedure for the estimation of the general form of the parent distribution requires that the parameters of the log-geometric distribution be calculated and analyzed for the sensitivity of these parameters to different conditions. In this study, we derive the shape factor of a log-geometric distribution from...
Impacts of precipitation seasonality and ecosystem types on evapotranspiration in the Yukon River Basin, Alaska
W. Yuan, S. Liu, H. Liu, J. T. Randerson, G. Yu, L.L. Tieszen
2010, Water Resources Research (46) 1-16
Evapotranspiration (ET) is the largest component of water loss from terrestrial ecosystems; however, large uncertainties exist when estimating the temporal and spatial variations of ET because of concurrent shifts in the magnitude and seasonal distribution of precipitation as well as differences in the response of ecosystem ET to environmental variabilities....
Milankovitch-scale correlations between deeply buried microbial populations and biogenic ooze lithology
I.W. Aiello, B.A. Bekins
2010, Geology (38) 79-82
The recent discoveries of large, active populations of microbes in the subseafloor of the world's oceans supports the impact of the deep biosphere biota on global biogeochemical cycles and raises important questions concerning the functioning of these extreme environments for life. These investigations demonstrated that subseafloor microbes are unevenly distributed...
Fuel buildup and potential fire behavior after stand-replacing fires, logging fire-killed trees and herbicide shrub removal in Sierra Nevada forests
Thomas W. McGinnis, Jon E. Keeley, Scott L. Stephens, Gary B. Roller
2010, Forest Ecology and Management (260) 22-35
Typically, after large stand-replacing fires in mid-elevation Sierra Nevada forests, dense shrub fields occupy sites formerly occupied by mature conifers, until eventually conifers overtop and shade out shrubs. Attempting to reduce fuel loads and expedite forest regeneration in these areas, the USDA Forest Service often disrupts this cycle by the...
Yearling greater sage-grouse response to energy development in Wyoming
M.J. Holloran, R.C. Kaiser, W.A. Hubert
2010, Journal of Wildlife Management (74) 65-72
Sagebrush (Artemisia spp.)-dominated habitats in the western United States have experienced extensive, rapid changes due to development of natural-gas fields, resulting in localized declines of greater sage-grouse (Centrocercus urophasianus) populations. It is unclear whether population declines in natural-gas fields are caused by avoidance or demographic impacts, or the age classes...
Landscape effects on diets of two canids in Northwestern Texas: A multinomial modeling approach
P.R. Lemons, J.S. Sedinger, M.P. Herzog, P. S. Gipson, R.L. Gilliland
2010, Journal of Mammalogy (91) 66-78
Analyses of feces, stomach contents, and regurgitated pellets are common techniques for assessing diets of vertebrates and typically contain more than 1 food item per sampling unit. When analyzed, these individual food items have traditionally been treated as independent, which represents pseudoreplication. When food types are recorded as present or...
Climatic water deficit, tree species ranges, and climate change in Yosemite National Park
James A. Lutz, Jan W. Van Wagtendonk, Jerry F. Franklin
2010, Journal of Biogeography (37) 936-350
Aim (1) To calculate annual potential evapotranspiration (PET), actual evapotranspiration (AET) and climatic water deficit (Deficit) with high spatial resolution; (2) to describe distributions for 17 tree species over a 2300-m elevation gradient in a 3000-km2 landscape relative to AET and Deficit; (3) to examine changes in AET and Deficit...
Seismicity and fluid geochemistry at Lassen Volcanic National Park, California: Evidence for two circulation cells in the hydrothermal system
Cathy J. Janik, Marcia K. McLaren
2010, Journal of Volcanology and Geothermal Research (189) 257-277
Seismic analysis and geochemical interpretations provide evidence that two separate hydrothermal cells circulate within the greater Lassen hydrothermal system. One cell originates south to SW of Lassen Peak and within the Brokeoff Volcano depression where it forms a reservoir of hot fluid (235–270°C) that boils to feed steam to the...
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...
A 15 000-year record of climate change in northern New Mexico, USA, inferred from isotopic and elemental contents of bog sediments
L. M. Cisneros-Dozal, J.M. Heikoop, J. Fessenden, R. Scott Anderson, P.A. Meyers, Craig D. Allen, M. Hess, T. Larson, G. Perkins, M. Rearick
2010, Journal of Quaternary Science (25) 1001-1007
Elemental (C, N, Pb) and isotopic (δ13C, δ15N) measurements of cored sediment from a small bog in northern New Mexico reveal changes in climate during the Late Pleistocene and Holocene. Abrupt increases in Pb concentration and δ13C values ca. 14 420 cal. YBP indicate significant runoff to the shallow lake that...
Tree-ring cutting dates and demographic change in the Southern Colorado Plateau and Rio Grande regions
Michael S. Berry, Larry V. Benson
Timothy A. Kohler, Mark D. Varien, Aaron M. Wright, editor(s)
2010, Book chapter, Leaving Mesa Verde: Peril and change in the thirteenth-century Southwest
No abstract available....
Shell anomalies observed in a population of Archaias angulatus (Foraminifera) from the Florida Keys (USA) sampled in 1982-83 and 2006-07
H.C. Souder, B. McCloskey, P. Hallock, R. Byrne
2010, Marine Micropaleontology (77) 71-81
Archived specimens of Archaias angulatus collected live at a depth of < 2. m in John Pennekamp Coral Reef State Park, Key Largo, Florida, in June, September and December 1982, and March 1983, were compared to specimens collected live from the same site and months in 2006-07. Shells were examined...
Rice production systems and avian influenza: Interactions between mixed-farming systems, poultry and wild birds
S.B. Muzaffar, John Y. Takekawa, D.J. Prosser, S. H. Newman, X. Xiao
2010, Waterbirds (33) 219-230
Wild waterfowl are the reservoir for avian influenza viruses (AIVs), a family of RNA viruses that may cause mild sickness in waterbirds. Emergence of H5N1, a highly pathogenic avian influenza (HPAI) strain, causing severe disease and mortality in wild birds, poultry and humans, had raised concerns about the role of...
Mapping the last frontier in Yellowstone National Park: Yellowstone Lake
Lisa A. Morgan, Wayne (Pat) Shanks
Jerry Johnson, editor(s)
2010, Book chapter, Knowing Yellowstone: Science in America's first national park
No abstract available....
Determining sources of dissolved organic carbon and disinfection byproduct precursors to the McKenzie River, Oregon
Tamara E.C. Kraus, Chauncey W. Anderson, Karl Morgenstern, Bryan D. Downing, Brian A. Pellerin, Brian A. Bergamaschi
2010, Journal of Environmental Quality (39) 2100-2112
This study was conducted to determine the main sources of dissolved organic carbon (DOC) and disinfection byproduct (DBP) precursors to the McKenzie River, Oregon (USA). Water samples collected from the mainstem, tributaries, and reservoir outflows were analyzed for DOC concentration and DBP formation potentials (trihalomethanes [THMFPs] and haloacetic acids [HAAFPs])....
Predicting species distributions from checklist data using site-occupancy models
M. Kery, B. Gardner, C. Monnerat
2010, Journal of Biogeography (37) 1851-1862
Aim: (1) To increase awareness of the challenges induced by imperfect detection, which is a fundamental issue in species distribution modelling; (2) to emphasize the value of replicate observations for species distribution modelling; and (3) to show how 'cheap' checklist data in faunal/floral databases may be used for the rigorous...
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...
