Quantifying the behavioral response of spawning chum salmon to elevated discharges from Bonneville Dam, Columbia River, USA
K.F. Tiffan, C. A. Haskell, T.J. Kock
2010, River Research and Applications (26) 87-101
Chum salmon Oncorhynchus keta that spawn in main-stem habitats below Bonneville Dam on the Columbia River, USA, are periodically subjected to elevated discharges that may alter spawning behaviour. We investigated behavioural responses of spawning chum salmon to increased water velocities associated with experimental increases in tailwater elevation using acoustic telemetry...
Inherent Limitations of Hydraulic Tomography
Geoffrey C. Bohling, J.J. Butler
2010, Ground Water (48) 809-824
We offer a cautionary note in response to an increasing level of enthusiasm regarding high-resolution aquifer characterization with hydraulic tomography. We use synthetic examples based on two recent field experiments to demonstrate that a high degree of nonuniqueness remains in estimates of hydraulic parameter fields even when those estimates are...
Assessment of multiple sources of anthropogenic and natural chemical inputs to a morphologically complex basin, Lake Mead, USA
Michael R. Rosen, P. C. Van Metre
2010, Palaeogeography, Palaeoclimatology, Palaeoecology (294) 30-43
Lakes with complex morphologies and with different geologic and land-use characteristics in their sub-watersheds could have large differences in natural and anthropogenic chemical inputs to sub-basins in the lake. Lake Mead in southern Nevada and northern Arizona, USA, is one such lake. To assess variations in chemical histories from 1935...
Do larval fishes exhibit diel drift patterns in a large, turbid river?
K.S. Reeves, D.L. Galat
2010, Journal of Applied Ichthyology (26) 571-577
Previous research suggested larval fishes do not exhibit a diel drift cycle in turbid rivers (transparency <30 cm). We evaluated this hypothesis in the turbid, lower Missouri River, Missouri. We also reviewed diel patterns of larval drift over a range of transparencies in rivers worldwide. Larval fishes were collected from...
Judging a brook by its cover: The relation between ecological condition of a stream and urban land cover in new England
J.F. Coles, T. F. Cuffney, G. McMahon, C. J. Rosiu
2010, Northeastern Naturalist (17) 29-48
The US Geological Survey conducted an urban land-use study in the New England Coastal Basins (NECB) area during 2001 to determine how urbanization relates to changes in the ecological condition of streams. Thirty sites were selected that differed in their level of watershed development (low to high). An urban intensity...
3D volumetric modeling of grapevine biomass using Tripod LiDAR
K.E. Keightley, G.W. Bawden
2010, Computers and Electronics in Agriculture (74) 305-312
Tripod mounted laser scanning provides the means to generate high-resolution volumetric measures of vegetation structure and perennial woody tissue for the calculation of standing biomass in agronomic and natural ecosystems. Other than costly destructive harvest methods, no technique exists to rapidly and accurately measure above-ground perennial tissue for woody plants...
Pyrethroid insecticide concentrations and toxicity in streambed sediments and loads in surface waters of the San Joaquin Valley, California, USA
Joseph L. Domagalski, Donald P. Weston, Minghua Zhang, Michelle L. Hladik
2010, Environmental Toxicology and Chemistry (29) 813-823
Pyrethroid insecticide use in California, USA, is growing, and there is a need to understand the fate of these compounds in the environment. Concentrations and toxicity were assessed in streambed sediment of the San Joaquin Valley of California, one of the most productive agricultural regions of the United States. Concentrations...
Fine scale daily movements and habitat use of East Pacific green turtles at a shallow coastal lagoon in Baja California Sur, Mexico
Jesse Senko, Volker Koch, William M. Megill, Raymond R. Carthy, R.obert P. Templeton, Wallace J. Nichols
2010, Journal of Experimental Marine Biology and Ecology (391) 92-100
Green turtles spend most of their lives in coastal foraging areas where they face multiple anthropogenic impacts. Therefore, understanding their spatial use in this environment is a priority for conservation efforts. We studied the fine scale daily movements and habitat use of East Pacific green turtles (Chelonia mydas) at Laguna...
Occurrence of the Great Lake's most recent invader, Hemimysis anomala, in the diet of fishes in southeastern Lake Ontario
B.F. Lantry, M. G. Walsh, J. H. Johnson, J.E. McKenna Jr.
2010, Journal of Great Lakes Research (36) 179-183
The Ponto-Caspian mysid, Hemimysis anomala, was first observed in southeastern Lake Ontario in May 2006. During July and August 2007, gill nets were fished in 6 to 8 m of water at two locations of known Hemimysis colonization in southeastern Lake Ontario to determine if fish that consume macroinvertebrates were...
Redwoods, restoration, and implications for carbon budgets
Mary Ann Madej
2010, Geomorphology (116) 264-273
The coast redwoods (Sequoia sempervirens) of California have several unique characteristics that influence interactions between vegetation and geomorphic processes. Case studies, using a combination of in-channel wood surveys and an air photo inventory of landslides, illustrate current conditions in a redwood-dominated watershed undergoing restoration work, and the influence of wood...
Influence of coal-tar sealcoat and other carbonaceous materials on polycyclic aromatic hydrocarbon loading in an urban watershed
Y. Yang, P. C. Van Metre, B.J. Mahler, J.T. Wilson, B. Ligouis, M. Razzaque, D.J. Schaeffer, C.J. Werth
2010, Environmental Science & Technology (44) 1217-1223
Carbonaceous material (CM) particles are the principal vectors transporting polycyclic aromatic hydrocarbons (PAHs) into urban waters via runoff; however, characteristics of CM particles in urban watersheds and their relative contributions to PAH contamination remain unclear. Our objectives were to identify the sources and distribution of CM particles in an urban...
Limited hydrologic response to Pleistocene climate change in deep vadose zones - Yucca Mountain, Nevada
J.B. Paces, L.A. Neymark, J. F. Whelan, J. L. Wooden, S.P. Lund, B.D. Marshall
2010, Earth and Planetary Science Letters (300) 287-298
Understanding the movement of water through thick vadose zones, especially on time scales encompassing long-term climate change, is increasingly important as societies utilize semi-arid environments for both water resources and sites viewed as favorable for long-term disposal or storage of hazardous waste. Hydrologic responses to Pleistocene climate change within a...
Landscape influences on genetic differentiation among bull trout populations in a stream-lake network
M.H. Meeuwig, C.S. Guy, S.T. Kalinowski, W.A. Fredenberg
2010, Molecular Ecology (19) 3620-3633
This study examined the influence of landscape heterogeneity on genetic differentiation between migratory bull trout (Salvelinus confluentus) populations in Glacier National Park, Montana. An information-theoretic approach was used to compare different conceptual models of dispersal associated with barriers, different models of isolation by distance, and the combined effects of barriers,...
Are modern geothermal waters in northwest Nevada forming epithermal gold deposits?
George N. Breit, Andrew G. Hunt, Ruth E. Wolf, Alan E. Koenig, Richard Fifarek, Mark F. Coolbaugh
2010, Conference Paper, Geological Society of Nevada Symposium, Great Basin Evolution and Metallogeny 2010
Hydrothermal systems currently are active near some gold deposits in northwestern Nevada. Possible links of these modern systems to gold mineralization were evaluated by chemically and isotopically analyzing water samples from the Brady, Dixie Valley, Humboldt House, San Emidio-Empire, Soda Lake, and Wabuska geothermal areas. In addition, quartz veins from...
Grid-size dependence of Cauchy boundary conditions used to simulate stream-aquifer interactions
S. Mehl, M. C. Hill
2010, Advances in Water Resources (33) 430-442
This work examines the simulation of stream–aquifer interactions as grids are refined vertically and horizontally and suggests that traditional methods for calculating conductance can produce inappropriate values when the grid size is changed. Instead, different grid resolutions require different estimated values. Grid refinement strategies considered include global refinement of the...
Carbon and hydrogen isotopic reversals in deep basin gas: Evidence for limits to the stability of hydrocarbons
R.C. Burruss, C.D. Laughrey
2010, Organic Geochemistry (41) 1285-1296
During studies of unconventional natural gas reservoirs of Silurian and Ordovician age in the northern Appalachian basin we observed complete reversal of the normal trend of carbon isotopic composition, such that ??13C methane (C1) >??13C ethane (C2) >??13C propane (C3). In addition, we have observed isotopic reversals in the ??2H...
Composition, distribution, and potential toxicity of organochlorine mixtures in bed sediments of streams
Patrick J. Phillips, Lisa H. Nowell, Robert J. Gilliom, Naomi Nakagaki, Karen Riva-Murray, Carolyn VanAlstyne
2010, Science of the Total Environment (408) 594-606
Mixtures of organochlorine compounds have the potential for additive or interactive toxicity to organisms exposed in the stream. This study uses a variety of methods to identify mixtures and a modified concentration-addition approach to estimate their potential toxicity at 845 stream sites across the United States sampled between 1992 and...
Determining the effects of dams on subdaily variation in river flows at a whole-basin scale
J. K. H. Zimmerman, B. H. Letcher, K.H. Nislow, K.A. Lutz, F.J. Magilligan
2010, River Research and Applications (26) 1246-1260
River regulation can alter the frequency and magnitude of subdaily flow variations causing major impacts on ecological structure and function. We developed an approach to quantify subdaily flow variation for multiple sites across a large watershed to assess the potential impacts of different dam operations (flood control, run-of-river hydropower and...
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])....
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....
Impact of sampling techniques on measured stormwater quality data for small streams
R. D. Harmel, R.M. Slade Jr., R.L. Haney
2010, Journal of Environmental Quality (39) 1734-1742
Science-based sampling methodologies are needed to enhance water quality characterization for setting appropriate water quality standards, developing Total Maximum Daily Loads, and managing nonpoint source pollution. Storm event sampling, which is vital for adequate assessment of water quality in small (wadeable) streams, is typically conducted by manual grab or integrated...
Influence of sea level rise on iron diagenesis in an east Florida subterranean estuary
M. Roy, J.B. Martin, J. Cherrier, J.E. Cable, Christopher G. Smith
2010, Geochimica et Cosmochimica Acta (74) 5560-5573
Subterranean estuary occupies the transition zone between hypoxic fresh groundwater and oxic seawater, and between terrestrial and marine sediment deposits. Consequently, we hypothesize, in a subterranean estuary, biogeochemical reactions of Fe respond to submarine groundwater discharge (SGD) and sea level rise. Porewater and sediment samples...
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 =...
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...
Land-use controls on sources and processing of nitrate in small watersheds: Insights from dual isotopic analysis
R.T. Barnes, P.A. Raymond
2010, Ecological Applications (20) 1961-1978
Studies have repeatedly shown that agricultural and urban areas export considerably more nitrogen to streams than forested counterparts, yet it is difficult to identify and quantify nitrogen sources to streams due to complications associated with terrestrial and in-stream biogeochemical processes. In this study, we used the isotopic composition of nitrate...
