Acoustic bed velocity and bed load dynamics in a large sand bed river
D. Gaeuman, R. B. Jacobson
2006, Journal of Geophysical Research F: Earth Surface (111)
Development of a practical technology for rapid quantification of bed load transport in large rivers would represent a revolutionary advance for sediment monitoring and the investigation of fluvial dynamics. Measurement of bed load motion with acoustic Doppler current profiles (ADCPs) has emerged as a promising approach for evaluating bed load...
Dietary exposure of largemouth bass to OCPs changes expression of genes important for reproduction
Natalia Garcia-Reyero, D.S. Barber, T. S. Gross, K. G. Johnson, M. S. Sepulveda, N.J. Szabo, N. D. Denslow
2006, Aquatic Toxicology (78) 358-369
Dieldrin and p,p???-DDE are ubiquitous contaminants known to act as endocrine disruptors, causing impaired development and reproduction in fish and wildlife. In order to elucidate the mechanisms by which dieldrin and p,p???-DDE cause endocrine disruption in largemouth bass (Micropterus salmoides), fish were exposed subchronically through the diet to both contaminants....
Long-term dynamics of production, respiration, and net CO2 exchange in two sagebrush-steppe ecosystems
T.G. Gilmanov, T.J. Svejcar, D.A. Johnson, R.F. Angell, Nicanor Z. Saliendra, B.K. Wylie
2006, Rangeland Ecology and Management (59) 585-599
We present a synthesis of long-term measurements of CO2 exchange in 2 US Intermountain West sagebrush-steppe ecosystems. The locations near Burns, Oregon (1995–2001), and Dubois, Idaho (1996–2001), are part of the AgriFlux Network of the Agricultural Research Service, United States Department of Agriculture. Measurements of net ecosystem CO2 exchange (Fc)...
Effects of tributary debris on the longitudinal profile of the Colorado River in Grand Canyon
Thomas C. Hanks, R. H. Webb
2006, Journal of Geophysical Research F: Earth Surface (111)
The Colorado River in Grand Canyon has long been known as a "rapids-and-pools" river, with the rapids owing their existence primarily to tributary debris flows. The debris flows deposit subaerial debris fans that constrict the channel laterally and, when they enter the river, raise the bed elevation. The rapids are...
Effects of hurricanes Katrina and Rita on the chemistry of bottom sediments in Lake Pontchartrain, Louisiana, USA
P. C. Van Metre, A. J. Horowitz, B.J. Mahler, W.T. Foreman, C. C. Fuller, M.R. Burkhardt, K. A. Elrick, E. T. Furlong, S. C. Skrobialowski, J.J. Smith, J.T. Wilson, S.D. Zaugg
2006, Environmental Science & Technology (40) 6894-6902
The effects of Hurricanes Katrina and Rita and the subsequent unwatering of New Orleans, Louisiana, on the sediment chemistry of Lake Pontchartrain were evaluated by chemical analysis of samples of street mud and suspended and bottom sediments. The highest concentrations of urban-related elements and compounds (e.g., Pb,...
Net carbon exchange across the Arctic tundra-boreal forest transition in Alaska 1981-2000
Catharine Copass Thompson, A. D. McGuire, Joy S. Clein, F. S. Chapin III, J. Beringer
2006, Conference Paper, Mitigation and Adaptation Strategies for Global Change
Shifts in the carbon balance of high-latitude ecosystems could result from differential responses of vegetation and soil processes to changing moisture and temperature regimes and to a lengthening of the growing season. Although shrub expansion and northward movement of treeline should increase carbon inputs, the effects of these vegetation changes...
In vitro interactions between Neoparamoeba spp. and salmonid leucocytes; The effect of parasite sonicate on anterior kidney leucocyte function
K. Gross, S. Alcorn, A. Murray, R. Morrison, B. Nowak
2006, Journal of Fish Biology (69) 293-300
Sonicated Neoparamoeba spp. (Nspp) did not affect the in vitro respiratory burst response of leucocytes isolated from Atlantic salmon Salmo salar, rainbow trout Oncorhynchus mykiss and chinook salmon Oncorhynchus tshawytscha anterior kidneys (P > 0.05). Atlantic salmon and chinook salmon leucocytes pre-incubated with the parasites, however, responded to phorbol myristate...
Occurrence and fate of organic contaminants during onsite wastewater treatment
K.E. Conn, L. B. Barber, G.K. Brown, R.L. Siegrist
2006, Environmental Science & Technology (40) 7358-7366
Onsite wastewater treatment systems serve approximately 25% of the U.S. population. However, little is known regarding the occurrence and fate of organic wastewater contaminants (OWCs), including endocrine disrupting compounds, during onsite treatment. A range of OWCs including surfactant metabolites, steroids, stimulants, metal-chelating agents, disinfectants, antimicrobial agents, and...
A geochronological approach for cave evolution in the Cantabrian Coast (Pindal Cave, NW Spain)
M. Jimenez-Sanchez, J. L. Bischoff, H. Stoll, A. Aranburu
2006, Conference Paper, Zeitschrift fur Geomorphologie, Supplementband
Some of the oldest speleothems in the North Cantabrian Coast (Spain) are reported for the first time in this work. Pindal Cave is developed at 24 m above sea level, in a karstic massif reaching its highest surface in a marine terrace (rasa) located at 50-64 m above the present...
Restoration of breeding by snowy plovers following protection from disturbance
K. D. Lafferty, D. Goodman, C.P. Sandoval
2006, Biodiversity and Conservation (15) 2217-2230
Promoting recreation and preserving wildlife are often dual missions for land managers, yet recreation may impact wildlife. Because individual disturbances are seemingly inconsequential, it is difficult to convince the public that there is a conservation value to restricting recreation to reduce disturbance. We studied threatened western snowy plovers (Charadrius alexandrinus...
Comparison of selenium bioaccumulation in the clams Corbicula fluminea and Potamocorbula amurensis: A bioenergetic modeling approach
B.-G. Lee, J.-S. Lee, S. N. Luoma
2006, Environmental Toxicology and Chemistry (25) 1933-1940
Selenium uptake from food (assimilation efficiency) and dissolved phase (influx rate) as well as loss kinetics (efflux rate) were compared between two bivalves, Corbicula fluminea and Potamocorbula amurensis. The effects of salinity and temperature on these kinetic parameters for both clam species also were evaluated. The Asiatic clam, C. fluminea,...
The diamondback terrapin: The biology, ecology, cultural history, and conservation status of an obligate estuarine turtle
K.M. Hart, D.S. Lee
Greenberg R.Maldonado J.E.Droege S.McDonald M.V., editor(s)
2006, Studies in Avian Biology 206-213
Ranging from Cape Cod to nearly the Texas-Mexico border, the diamondback terrapin (Malaclemys terrapin) is the only species of North American turtle restricted to estuarine systems. Despite this extensive distribution, its zone of occurrence is very linear, and in places fragmented, resulting in a relatively small total area of occupancy....
Nitrogen loads through baseflow, stormflow, and underflow to Rehoboth Bay, Delaware
J.A. Volk, K.B. Savidge, J.R. Scudlark, A.S. Andres, W.J. Ullman
2006, Journal of Environmental Quality (35) 1742-1755
A detailed study of water and nitrogen (N) discharge from a small, representative subwatershed of Rehoboth Bay, Delaware, was conducted to determine total N loads to the bay. The concentrations of ammonium (NH 4+), nitrate + nitrite (NO3- + NO2-), and dissolved and particulate organic N were determined in baseflow...
Pharmaceuticals and other organic chemicals in selected north-central and northwestern Arkansas streams
B. E. Haggard, J.M. Galloway, W. R. Green, M. T. Meyer
2006, Journal of Environmental Quality (35) 1078-1087
Recently, our attention has focused on the low level detection of many antibiotics, pharmaceuticals, and other organic chemicals in water resources. The limited studies available suggest that urban or rural streams receiving wastewater effluent are more susceptible to contamination. The purpose of this study was to evaluate the occurrence of...
Analysis of ecosystem controls on soil carbon source-sink relationships in the northwest Great Plains
Z. Tan, S. Liu, C.A. Johnston, J. Liu, L.L. Tieszen
2006, Global Biogeochemical Cycles (20) 1-9
Our ability to forecast the role of ecosystem processes in mitigating global greenhouse effects relies on understanding the driving forces on terrestrial C dynamics. This study evaluated the controls on soil organic C (SOC) changes from 1973 to 2000 in the northwest Great Plains. SOC source-sink relationships were quantified using...
Effects of polychlorinated biphenyls, hexachlorocyclohexanes, and mercury on human neutrophil apoptosis, actin cytoskelton, and oxidative state
L.I. Sweet, D. R. Passino-Reader, P.G. Meier, G.M. Omann
2006, Environmental Toxicology and Pharmacology (22) 179-188
Apoptosis, or programmed cell death, has been proposed as a biomarker for environmental contaminant effects. In this work, we test the hypothesis that in vitro assays of apoptosis are sensitive indicators of immunological effects of polychlorinated biphenyls, hexachlorocyclohexanes, and mercury on human neutrophils. Apoptosis, necrosis, and viability as well as...
Importance of spatial autocorrelation in modeling bird distributions at a continental scale
V. Bahn, R.J. O’Connor, W.B. Krohn
2006, Ecography (29) 835-844
Spatial autocorrelation in species' distributions has been recognized as inflating the probability of a type I error in hypotheses tests, causing biases in variable selection, and violating the assumption of independence of error terms in models such as correlation or regression. However, it remains unclear whether these problems occur at...
Derivation of planetary topography using multi-image shape-from-shading
Volker Lohse, Christian Heipke, Randolph L. Kirk
2006, Planetary and Space Science (54) 661-674
In many cases, the derivation of high-resolution digital terrain models (DTMs) from planetary surfaces using conventional digital image matching is a problem. The matching methods need at least one stereo pair of images with sufficient texture. However, many space missions provide only a few stereo images and planetary surfaces often...
Peak flow responses to landscape disturbances caused by the cataclysmic 1980 eruption of Mount St. Helens, Washington
Jon J. Major, Linda E. Mark
2006, Geological Society of America Bulletin (118) 938-958
Years of discharge measurements that precede and follow the cataclysmic 1980 eruption of Mount St. Helens, Washington, provide an exceptional opportunity to examine the responses of peak flows to abrupt, widespread, devastating landscape disturbance. Multiple basins surrounding Mount St. Helens (300–1300 km2 drainage areas) were variously disturbed by: (1) a debris...
Survey of organic wastewater contaminants in biosolids destined for land application
C.A. Kinney, E. T. Furlong, S.D. Zaugg, M.R. Burkhardt, S.L. Werner, J.D. Cahill, G.R. Jorgensen
2006, Environmental Science & Technology (40) 7207-7215
In this study, the presence, composition, and concentrations of organic wastewater contaminants (OWCs) were determined in solid materials produced during wastewater treatment. This study was undertaken to evaluate the potential of these solids, collectively referred to as biosolids, as a source of OWCs to soil and water...
Crustal structure of the northeastern margin of the Tibetan plateau from the Songpan-Ganzi terrane to the Ordos basin
M. Liu, Walter D. Mooney, S. Li, N. Okaya, Shane T. Detweiler
2006, Tectonophysics (420) 253-266
The 1000-km-long Darlag–Lanzhou–Jingbian seismic refraction profile is located in the NE margin of the Tibetan plateau. This profile crosses the northern Songpan-Ganzi terrane, the Qinling-Qilian fold system, the Haiyuan arcuate tectonic region, and the stable Ordos basin. The P-wave and S-wave velocity structure...
Methods for pore water extraction from unsaturated zone tuff, Yucca Mountain, Nevada
K.M. Scofield
2006, Conference Paper, Proceedings of the 11th International High Level Radioactive Waste Management Conference, IHLRWM
Assessing the performance of the proposed high-level radioactive waste repository at Yucca Mountain, Nevada, requires an understanding of the chemistry of the water that moves through the host rock. The uniaxial compression method used to extract pore water from samples of tuffaceous borehole core was successful only for nonwelded tuff....
Predation on walleye eggs by fish on reefs in western Lake Erie
E.F. Roseman, W.W. Taylor, D.B. Hayes, A.L. Jones, J.T. Francis
2006, Journal of Great Lakes Research (32) 415-423
We examined diets of fishes from gillnet and egg pump collections conducted on reefs in western Lake Erie during walleye (Sander vitreus) egg incubation periods from 1994–1999 and 2004 to assess incidence of walleye eggs in fish diets. We collected no potential egg predators in samples taken in 1994 but...
Survey and monitoring of species at risk at Camp Blanding Training Site, northeastern Florida
C.J. Gregory, R.R. Carthy, L.G. Pearlstine
2006, Southeastern Naturalist (5) 473-498
We studied the presence and distribution of 19 species at risk in northeastern Florida at the Camp Blanding Training Site (CBTS) during 2000-2001, seven years after the first major baseline surveys of CBTS were conducted. Much of the training conducted at CBTS deals with light infantry exercises, but the site...
A screening-level assessment of lead, cadmium, and zinc in fish and crayfish from northeastern Oklahoma, USA
C. J. Schmitt, W. G. Brumbaugh, G.L. Linder, J.E. Hinck
2006, Environmental Geochemistry and Health (28) 445-471
The objective of this study was to evaluate potential human and ecological risks associated with metals in fish and crayfish from mining in the Tri-States Mining District (TSMD). Crayfish (Orconectes spp.) and fish of six frequently consumed species (common carp, Cyprinus carpio; channel catfish, Ictalurus punctatus; flathead catfish, Pylodictis olivaris;...
