Technology and the study of wildfire: Middle school students study the impacts of wildfire
D. Fox-Gliessman, J.J. Kerski
2005, Meridian (8)
Various technologies that can assist students in exploring the human and environmental impacts of wildfire and in communicating their findings are discussed. Wildfires occur in many parts of the world, and provide an excellent opportunity for students to study local and global interdisciplinary issues using technology. Prior to the beginning...
Eradication of invasive Tamarix ramosissima along a desert stream increases native fish density
T.A. Kennedy, J. C. Finlay, S.E. Hobbie
2005, Ecological Applications (15) 2072-2083
Spring ecosystems of the western United States have high conservation value, particularly because of the highly endemic, and often endangered, fauna that they support. Refuges now protect these habitats from many of the human impacts that once threatened them, but invasive species often persist. Invasive saltcedar is ubiquitous along streams,...
Effect of humic substance photodegradation on bacterial growth and respiration in lake water
A.M. Anesio, W. Graneli, G. R. Aiken, D.J. Kieber, K. Mopper
2005, Applied and Environmental Microbiology (71) 6267-6275
This study addresses how humic substance (HS) chemical composition and photoreactivity affect bacterial growth, respiration, and growth efficiency (BGE) in lake water. Aqueous solutions of HSs from diverse aquatic environments representing different dissolved organic matter sources (autochthonous and allochthonous) were exposed to artificial solar UV radiation. These solutions were added...
Diet overlap of introduced rainbow trout and three native fishes in an Ozark stream
D.B. Fenner, M. G. Walsh, D.L. Winkelman
2005, American Fisheries Society Symposium (2005) 475-482
Private angling groups in Oklahoma have requested permission to stock rainbow trout Oncorhynchus mykiss into streams of northeastern Oklahoma although little is known regarding interactions between introduced rainbow trout and native fishes in these systems. Our study objectives were to assess diet overlap between introduced rainbow trout and native smallmouth...
Young (late Amazonian), near-surface, ground ice features near the equator, Athabasca Valles, Mars
D.M. Burr, R.J. Soare, Bun Tseung J.-M. Wan, J.P. Emery
2005, Icarus (178) 56-73
A suite of four feature types in a ???20 km2 area near 10?? N, 204?? W in Athabasca Valles is interpreted to have resulted from near-surface ground ice. These features include mounds, conical forms with rimmed summit depressions, flatter irregularly-shaped forms with raised rims, and polygonal terrain. Based on morphology,...
USGS/National Wildlife Health Center's Quarterly Wildlife Mortality Report
R. Sohn, K. A. Converse, G. McLaughlin, Kimberli J.G. Miller
2005, Supplement to the Journal of Wildlife Diseases (41)
Assessment of regional management strategies for controlling seawater intrusion
E.G. Reichard, T.A. Johnson
2005, Journal of Water Resources Planning and Management (131) 280-291
Simulation-optimization methods, applied with adequate sensitivity tests, can provide useful quantitative guidance for controlling seawater intrusion. This is demonstrated in an application to the West Coast Basin of coastal Los Angeles that considers two management options for improving hydraulic control of seawater intrusion: increased injection into barrier wells and in...
Trace elements in streambed sediments of small subtropical streams on O'ahu, Hawai'i: Results from the USGS NAWQA program
E. H. De Carlo, M.S. Tomlinson, S. S. Anthony
2005, Applied Geochemistry (20) 2157-2188
Data are presented for trace element concentrations determined in the <63 ??m fraction of streambed sediment samples collected at 24 sites on the island of O'ahu, Hawai'i. Sampling sites were classified as urban, agricultural, mixed (urban/agricultural), or forested based on their dominant land use, although the mixed land use at...
Using multiple chemical indicators to assess sources of nitrate and age of groundwater in a karstic spring basin
Brian Katz, R. Copeland, T. Greenhalgh, R. Ceryak, W. Zwanka
2005, Environmental & Engineering Geoscience (11) 333-346
Human health and ecological concerns have arisen due to a steady increase in nitrate-N concentrations during the past 40 years in Fannin Springs (0.3-4.7 mg/L), a regional discharge point with an average flow of >2.8 m3/second (>100 ft3/second) for water from the karstic Upper Floridan aquifer (UFA). Multiple chemical indicators...
An astrobiological perspective on Meridiani Planum
A.H. Knoll, M. Carr, B. Clark, D.J. Des Marais, J.D. Farmer, W.W. Fischer, J.P. Grotzinger, S. M. McLennan, M. Malin, C. Schroder, S. Squyres, N.J. Tosca, T. Wdowiak
2005, Earth and Planetary Science Letters (240) 179-189
Sedimentary rocks exposed in the Meridiani Planum region of Mars record aqueous and eolian deposition in ancient dune and interdune playa-like environments that were arid, acidic, and oxidizing. On Earth, microbial populations have repeatedly adapted to low pH and both episodic and chronic water limitation, suggesting that, to a first...
Foreland-forearc collisional granitoid and mafic magmatism caused by lower-plate lithospheric slab breakoff: The Acadian of Maine, and other orogens
A. Schoonmaker, W.S.F. Kidd, D. C. Bradley
2005, Geology (33) 961-964
During collisional convergence, failure in extension of the lithosphere of the lower plate due to slab pull will reduce the thickness or completely remove lower-plate lithosphere and cause decompression melting of the asthenospheric mantle; magmas from this source may subsequently provide enough heat for substantial partial melting of crustal rocks...
Landscape development in an hyperarid sandstone environment along the margins of the Dead Sea fault: Implications from dated rock falls
A. Matmon, Y. Shaked, N. Porat, Y. Enzel, R. Finkel, N. Lifton, E. Boaretto, A. Agnon
2005, Earth and Planetary Science Letters (240) 803-817
In this study, we explored the spatial and temporal relations between boulders and their original in-situ locations on sandstone bedrock cliffs. This was accomplished by combining field observations with dating methods using cosmogenic isotopes (10Be and 14C) and optically stimulated luminescence (OSL). Our conclusions bear both on the landscape evolution and...
Evidence of detrimental effects of environmental contaminants on growth and reproductive physiology of white sturgeon in impounded areas of the Columbia River
G.W. Feist, M.A.H. Webb, D.T. Gundersen, E.P. Foster, C.B. Schreck, A.G. Maule, M.S. Fitzpatrick
2005, Environmental Health Perspectives (113) 1675-1682
This study sought to determine whether wild white sturgeon from the Columbia River (Oregon) were exhibiting signs of reproductive endocrine disruption. Fish were sampled in the free-flowing portion of the river (where the population is experiencing reproductive success) and from three reservoirs behind hydroelectric dams (where fish have reduced reproductive...
Distribution, foraging behavior, and capture results of the spotted bat (Euderma maculatum) in central Oregon
T.J. Rodhouse, M.F. McCaffrey, R.G. Wright
2005, Western North American Naturalist (65) 215-222
The spotted bat (Euderma maculatum) has been virtually unknown in Oregon despite the existence of potential habitat in many areas of the state. In 2002 and 2003 we searched for spotted bats along the John Day, Deschutes, and Crooked Rivers and at a remote dry canyon southeast of the city...
Canadian Journal of Forest Research: Foreword
M. Apps, A. D. McGuire
2005, Conference Paper, Canadian Journal of Forest Research
[No abstract available]...
Five things I've learned in 25 years of popularizing geology
R. Buchanan
2005, Palaios (20) 1-2
[No abstract available]...
Dissolution of cinnabar (HgS) in the presence of natural organic matter
J.S. Waples, K. L. Nagy, G. R. Aiken, J. N. Ryan
2005, Geochimica et Cosmochimica Acta (69) 1575-1588
Cinnabar (HgS) dissolution rates were measured in the presence of 12 different natural dissolved organic matter (DOM) isolates including humic, fulvic, and hydrophobic acid fractions. Initial dissolution rates varied by 1.3 orders of magnitude, from 2.31 × 10−13 to 7.16 × 10−12 mol Hg (mg C)−1 m−2s−1. Rates correlate positively with three DOM...
Evaluation of temperature differences for paired stations of the U.S. Climate Reference Network
K. P. Gallo
2005, Journal of Climate (18) 1629-1636
Adjustments to data observed at pairs of climate stations have been recommended to remove the biases introduced by differences between the stations in time of observation, temperature instrumentatios, latitude, and elevation. A new network of climate stations, located in rural settings, permits comparisons of temperatures for several pairs of stations...
Selecting a distributional assumption for modelling relative densities of benthic macroinvertebrates
B. R. Gray
2005, Ecological Modelling (185) 1-12
The selection of a distributional assumption suitable for modelling macroinvertebrate density data is typically challenging. Macroinvertebrate data often exhibit substantially larger variances than expected under a standard count assumption, that of the Poisson distribution. Such overdispersion may derive from multiple sources, including heterogeneity of habitat (historically and spatially), differing life...
Evidence and implications of recent climate change in Northern Alaska and other Arctic regions
L. D. Hinzman, N.D. Bettez, W.R. Bolton, F.S. Chapin, M.B. Dyurgerov, C.L. Fastie, B. Griffith, R.D. Hollister, Allen Hope, H.P. Huntington, A.M. Jensen, G.J. Jia, T. Jorgenson, D.L. Kane, D.R. Klein, G. Kofinas, A.H. Lynch, A.H. Lloyd, A. D. McGuire, Frederick E. Nelson, W.C. Oechel, T.E. Osterkamp, C.H. Racine, V.E. Romanovsky, R. S. Stone, D.A. Stow, M. Sturm, C.E. Tweedie, G.L. Vourlitis, M.D. Walker, D.A. Walker, P.J. Webber, J.M. Welker, K.S. Winker, K. Yoshikawa
2005, Climatic Change (72) 251-298
The Arctic climate is changing. Permafrost is warming, hydrological processes are changing and biological and social systems are also evolving in response to these changing conditions. Knowing how the structure and function of arctic terrestrial ecosystems are responding to recent and persistent climate change is paramount to understanding the future...
Decomposition rates and termite assemblage composition in semiarid Africa
Gregor Schuurman
2005, Ecology (86) 1236-1249
Outside of the humid tropics, abiotic factors are generally considered the dominant regulators of decomposition, and biotic influences are frequently not considered in predicting decomposition rates. In this study, I examined the effect of termite assemblage composition and abundance on decomposition of wood litter of an indigenous species (Croton megalobotrys)...
Radiated energy and the physics of earthquake faulting
Art McGarr, R.E. Abercrombie, H. Kanamori
2005, Conference Paper, Eos
[No abstract available]...
Late Quaternary eolian and alluvial response to paleoclimate, Canyonlands, southeastern Utah
M.C. Reheis, R. L. Reynolds, H. Goldstein, H.M. Roberts, J. C. Yount, Y. Axford, L.S. Cummings, N. Shearin
2005, Geological Society of America Bulletin (117) 1051-1069
In upland areas of Canyonlands National Park, Utah, thin deposits and paleosols show late Quaternary episodes of eolian sedimentation, pedogenesis, and climate change. Interpretation of the stratigraphy and optically stimulated luminescence ages of eolian and nearby alluvial deposits, their pollen, and intercalated paleosols yields the following history: (1) Eolian deposition...
Density-dependent habitat selection by brown-headed cowbirds (Molothrus ater) in tallgrass prairie
W.E. Jensen, J.F. Cully Jr.
2005, Oecologia (142) 136-149
Local distributions of avian brood parasites among their host habitats may depend upon conspecific parasite density. We used isodar analysis to test for density-dependent habitat selection in brown-headed cowbirds (Molothrus ater) among tallgrass prairie adjacent to wooded edges, and prairie interior habitat (>100 m from wooded edges) with and without...
Integrated core-log petrofacies analysis in the construction of a reservoir geomodel: A case study of a mature Mississippian carbonate reservoir using limited data
S. Bhattacharya, J.H. Doveton, T.R. Carr, W.R. Guy, P.M. Gerlach
2005, American Association of Petroleum Geologists Bulletin (89) 1257-1274
Small independent operators produce most of the Mississippian carbonate fields in the United States mid-continent, where a lack of integrated characterization studies precludes maximization of hydrocarbon recovery. This study uses integrative techniques to leverage extant data in an Osagian and Meramecian (Mississippian) cherty carbonate reservoir in Kansas. Available data include...
