Importance of storm events in controlling ecosystem structure and function in a Florida Gulf Coast estuary
Stephen E Davis, J.E. Cable, D.L. Childers, C. Coronado-Molina, J.W. Day, C.D. Hittle, C.J. Madden, E. Reyes, D. Rudnick, F. Sklar
2004, Journal of Coastal Research (20) 1198-1208
From 8/95 to 2/01, we investigated the ecological effects of intra- and inter-annual variability in freshwater flow through Taylor Creek in southeastern Everglades National Park. Continuous monitoring and intensive sampling studies overlapped with an array of pulsed weather events that impacted physical, chemical, and biological attributes of this region. We...
The National Geochemical Survey: Database and documentation
Water Resources Division, U.S. Geological Survey
2004, Open-File Report 2004-1001
The USGS, in collaboration with other federal and state government agencies, industry, and academia, is conducting the National Geochemical Survey (NGS) to produce a body of geochemical data for the United States based primarily on stream sediments, analyzed using a consistent set of methods. These data will compose a...
The role of red alder in riparian forest structure along headwater streams in southeastern Alaska
E.H. Orlikowska, R.L. Deal, P.E. Hennon, M.S. Wipfli
2004, Northwest Science (78) 111-123
We assessed the influence of red alder on tree species composition, stand density, tree size distribution, tree mortality, and potential for producing large conifers, in 38-42 yr old riparian forests along 13 headwater streams in the Maybeso and Harris watersheds on Prince of Wales Island, Alaska. Red alder ranged from...
Rhyodacites of Kulshan caldera, North Cascades of Washington: Postcaldera lavas that span the Jaramillo
W. Hildreth, M. A. Lanphere, D.E. Champion, J. Fierstein
2004, Journal of Volcanology and Geothermal Research (130) 227-264
Kulshan caldera (4.5×8 km), at the northeast foot of Mount Baker, is filled with rhyodacite ignimbrite (1.15 Ma) and postcaldera lavas and is only the third Quaternary caldera identified in the Cascade arc. A gravity traverse across the caldera yields a steep-sided, symmetrical, complete Bouguer anomaly of −16 mGal centered...
Phenotypic variation and vulnerability to predation in juvenile bluegill sunfish (Lepomis macrochirus)
S. R. Chipps, J.A. Dunbar, David H. Wahl
2004, Oecologia (138) 32-38
Bluegill sunfish (Lepomis macrochirus) are known to diversify into two forms specialized for foraging on either limnetic or littoral prey. Because juvenile bluegills seek vegetative cover in the presence of largemouth bass (Micropterus salmoides) predators, natural selection should favor the littoral body design at size ranges most vulnerable to predation....
CO2 mitigation via accelerated limestone weathering
Greg H. Rau, Kevin G. Knauss, William H. Langer, Caldeira Ken
2004, Conference Paper, ACS National Meeting Book of Abstracts
We evaluate accelerated weathering of limestone (AWL: CO2 + CaCO3 + H2O=> Ca2+ + 2HCO3-) as a low-tech, inexpensive, high-capacity, environmentally-friendly CO2 capture and sequestration technology. With access to seawater and limestone being essential to this approach, significant limestone resources are close to most CO2-emitting power plants along the coastal...
Clay-catalyzed reactions of coagulant polymers during water chlorination
J.-F. Lee, P.-M. Liao, C.-K. Lee, H.-P. Chao, C.-L. Peng, C. T. Chiou
2004, Journal of Colloid and Interface Science (270) 381-387
The influence of suspended clay/solid particles on organic-coagulant reactions during water chlorination was investigated by analyses of total product formation potential (TPFP) and disinfection by-product (DBP) distribution as a function of exchanged clay cation, coagulant organic polymer, and reaction time. Montmorillonite clays appeared to act as a catalytic center where...
Evaluation of flushing of a high-selenium backwater channel in the Colorado River
S. J. Hamilton, K.M. Holley, K.J. Buhl, F.A. Bullard, L.K. Weston, S.F. McDonald
2004, Environmental Toxicology (19) 51-81
Concern has been raised that selenium contamination may be adversely affecting endangered fish in the upper Colorado River basin. The objective of the study was to determine if operation of a water control structure (opened in December 1996) that allowed the Colorado River to flow through a channel area at...
Use of RORA for Complex Ground-Water Flow Conditions
A. T. Rutledge
2004, Water-Resources Investigations Report 2003-4304
The RORA computer program for estimating recharge is based on a condition in which ground water flows perpendicular to the nearest stream that receives ground-water discharge. The method, therefore, does not explicitly account for the ground-water-flow component that is parallel to the stream. Hypothetical finite-difference simulations are used to demonstrate...
Persistence of identifiable remains of white sturgeon juveniles in digestive tracts of northern pikeminnow
D.M. Gadomski, C.N. Frost
2004, California Fish and Game (90) 85-90
Juvenile white sturgeon, Acipenser transmontanus, have not been commonly identified as prey items in digestive tracts of fishes collected in the wild. In particular, the diet of northern pikeminnow, Ptychocheilus oregonensis, an abundant Pacific Northwest freshwater predator which has been widely studied, has not included juvenile white sturgeon. To aid...
Concentrations of metals and trace elements in blood of spectacled and king eiders in northern Alaska, USA
Heather M. Wilson, Margaret R. Petersen, Declan Troy
2004, Environmental Toxicology and Chemistry (23) 408-414
In 1996, we measured concentrations of arsenic, barium, cadmium, lead, mercury, and selenium in blood of adult king (Somateria spectabilis) and spectacled (Somateria fischeri) eiders and duckling spectacled eiders from northern Alaska, USA. Concentrations of selenium exceeded background levels in all adults sampled and 9 of 12 ducklings. Mercury was...
Strontium isotope geochemistry of groundwater in the central part of the Dakota (Great Plains) aquifer, USA
D.C. Gosselin, F.E. Harvey, C. Frost, R. Stotler, P. A. Macfarlane
2004, Applied Geochemistry (19) 359-377
The Dakota aquifer of the central and eastern Great Plains of the United States is an important source of water for municipal supplies, irrigation and industrial use. Although the regional flow system can be characterized generally as east to northeasterly from the Rocky Mountains towards the Missouri River, locally the...
Drowning of the - 150 m reef off Hawaii: A casualty of global meltwater pulse 1A?
J.M. Webster, D.A. Clague, K. Riker-Coleman, C. Gallup, J.C. Braga, D. Potts, J.G. Moore, E.L. Winterer, C. K. Paull
2004, Geology (32) 249-252
We present evidence that the drowning of the - 150 m coral reef around Hawaii was caused by rapid sea-level rise associated with meltwater pulse 1A (MWP-1A) during the last deglaciation. New U/Th and 14C accelerator mass spectrometry dates, combined with reinterpretation of existing radiometric dates, constrain the age of...
The fire and fire surrogate study in the Sierra Nevada: Evaluating restoration treatments at Blodgett Experimental Forest and Sequoia National Park,
E. E. Knapp, S.L. Stephens, J.D. Mciver, J.J. Moghaddas, Jon E. Keeley
2004, General Technical Report PSW-GTR-193
No abstract available at this time...
Quarry expansion - Sustainable management of natural aggregate
W. H. Langer, M. L. Tucker
2004, Mining Engineering (56) 23-28
[No abstract available]...
Mineralization and nitrification patterns at eight northeastern USA forested research sites
D.S. Ross, G.B. Lawrence, G. Fredriksen
2004, Forest Ecology and Management (188) 317-335
Nitrogen transformation rates in eight northeastern US research sites were measured in soil samples taken in the early season of 2000 and the late season of 2001. Net mineralization and nitrification rates were determined on Oa or A horizon samples by two different sampling methods - intact cores and repeated...
Isotopic, geochemical, and temporal characterization of Proterozoic basement rocks in the Quitovac region, northwestern Sonora, Mexico: Implications for the reconstruction of the southwestern margin of Laurentia
A. Iriondo, W. R. Premo, Luis M. Martinez-Torres, J. R. Budahn, William W. Atkinson Jr., D. F. Siems, B. Guaras-Gonzalez
2004, Geological Society of America Bulletin (116) 154-170
A detailed geochemical characterization of 19 representative Proterozoic basement rocks in the Quitovac region in northwestern Sonora, Mexico, has identified two distinct Paleoproterozoic basement blocks that coincide spatially with the previously proposed Caborca and "North America" blocks. New U-Pb zircon geochronology revises their age ranges, the Caborca (1.78-1.69 Ga) and...
Geological and anthropogenic factors influencing mercury speciation in mine wastes: An EXAFS spectroscopy study
C.S. Kim, J. J. Rytuba, Gordon E. Brown Jr.
2004, Applied Geochemistry (19) 379-393
The speciation of Hg is a critical determinant of its mobility, reactivity, and potential bioavailability in mine-impacted regions. Furthermore, Hg speciation in these complex natural systems is influenced by a number of physical, geological, and anthropogenic variables. In order to investigate the degree to which several of these variables may...
Timing of the most recent surface rupture event on the Ohariu Fault near Paraparaumu, New Zealand
N. Litchfield, R. Van Dissen, Rob Langridge, D. Heron, C. Prentice
2004, New Zealand Journal of Geology and Geophysics (47) 123-127
Thirteen radiocarbon ages from three trenches across the Ohariu Fault tightly constrain the timing of the most recent surface rupture event at Muaupoko Stream valley, c. 2 km east of Paraparaumu, to between 930 and 1050 cal. yr BP. This age overlaps with previously published ages of the most recent...
Kinematic and dynamic rupture models of the November 3, 2002 Mw7.9 Denali, Alaska, earthquake
Douglas S. Dreger, D. D. Oglesby, R. Harris, N. Ratchkovski, R. Hansen
2004, Geophysical Research Letters (31)
Regional seismic waveforms, continuous and campaign-mode GPS data, and surface slip measurements were used to obtain a kinematic model of the rupture process of the November 3, 2002 Mw 7.9 Denali, Alaska, earthquake. The event initiated as a Mw 7.0 reverse slip event on the north-dipping Susitna Glacier fault with...
Evaluating microbial purification during soil treatment of wastewater with multicomponent tracer and surrogate tests
S. Van Cuyk, R.L. Siegrist, K. Lowe, R.W. Harvey
2004, Journal of Environmental Quality (33) 316-329
Soil treatment of wastewater has the potential to achieve high purification efficiency, yet the understanding and predictability of purification with respect to removal of viruses and other pathogens is limited. Research has been completed to quantify the removal of virus and bacteria through the use of microbial surrogates and conservative...
Dispersal scaling from the world's rivers
J.A. Warrick, D.A. Fong
2004, Geophysical Research Letters (31)
Although rivers provide important biogeochemical inputs to oceans, there are currently no descriptive or predictive relationships of the spatial scales of these river influences. Our combined satellite, laboratory, field and modeling results show that the coastal dispersal areas of small, mountainous rivers exhibit remarkable self-similar scaling relationships over many orders...
The northwestern slope valleys (NSVs) region, Mars: A prime candidate site for the future exploration of Mars
J. M. Dohm, J.C. Ferris, N.G. Barlow, V.R. Baker, W.C. Mahaney, R. C. Anderson, T.M. Hare
2004, Conference Paper, Planetary and Space Science
The northwestern slope valleys region is a prime candidate site for future science-driven Mars exploration because it records Noachian to Amazonian Tharsis development in a region that encapsulates (1) a diverse and temporally extensive stratigraphic record, (2) at least three distinct paleohydrologic regimes, (3) gargantuan structurally controlled flood valleys that...
Use of naturally occurring mercury to determine the importance of cutthroat trout to Yellowstone grizzly bears
L.A. Felicetti, C.C. Schwartz, R. O. Rye, K.A. Gunther, J.G. Crock, M.A. Haroldson, L. Waits, C.T. Robbins
2004, Canadian Journal of Zoology (82) 493-501
Spawning cutthroat trout (Oncorhynchus clarki (Richardson, 1836)) are a potentially important food resource for grizzly bears (Ursus arctos horribilis Ord, 1815) in the Greater Yellowstone Ecosystem. We developed a method to estimate the amount of cutthroat trout ingested by grizzly bears living in the Yellowstone Lake area. The method utilized (i) the...
Biochemical characterization of the eelgrass Zostera marina at its southern distribution limit in the North Pacific
Alejandro Cabello-Pasini, Raquel Muniz-Salazar, David H. Ward
2004, Ciencias Marinas (30) 21-34
The eelgrass Zostera marina L. is distributed along the Baja California Peninsula (Mexico) where it is exposed to a wide range of irradiances and temperatures that could promote changes in its biochemical composition. Consequently, the objective of this study was to characterize the variations in the levels of chlorophyll, carbohydrates,...
