The Ellsworth terrane, coastal Maine: Geochronology, geochemistry, and Nd-Pb isotopic composition - Implications for the rifting of Ganderia
K. J. Schulz, D. B. Stewart, R. D. Tucker, J.C. Pollock, R. A. Ayuso
2008, Geological Society of America Bulletin (120) 1134-1158
The Ellsworth terrane is one of a number of fault-bounded blocks that occur along the eastern margin of Ganderia, the western-most of the peri-Gondwanan domains in the northern Appalachians that were accreted to Laurentia in the Paleozoic. Geologic relations, detrital zircon ages, and basalt geochemistry suggest that the Ellsworth terrane...
Recent sedimentation patterns within the central Atchafalaya Basin, Louisiana
C.R. Hupp, C. R. Demas, D.E. Kroes, Richard H. Day, T.W. Doyle
2008, Wetlands (28) 125-140
Sediment deposition and storage are important functions of forested bottomlands, yet documentation and interpretation of sedimentation processes in these systems remain incomplete. Our study was located in the central Atchafalaya Basin, Louisiana, a distributary of the Mississippi River and contains the largest contiguously forested riparian wetland in North America, which...
Dissolved and labile concentrations of Cd, Cu, Pb, and Zn in the South Fork Coeur d'Alene River, Idaho: Comparisons among chemical equilibrium models and implications for biotic ligand models
Laurie S. Balistrieri, R.G. Blank
2008, Applied Geochemistry (23) 3355-3371
In order to evaluate thermodynamic speciation calculations inherent in biotic ligand models, the speciation of dissolved Cd, Cu, Pb, and Zn in aquatic systems influenced by historical mining activities is examined using equilibrium computer models and the diffusive gradients in thin films...
Metalliferous sediment and a silica-hematite deposit within the Blanco fracture zone, Northeast Pacific
J.R. Hein, D.A. Clague, R.A. Koski, R.W. Embley, R.E. Dunham
2008, Marine Georesources and Geotechnology (26) 317-339
A Tiburon ROV dive within the East Blanco Depression (EBD) increased the mapped extent of a known hydrothermal field by an order of magnitude. In addition, a unique opal-CT (cristobalite-tridymite)-hematite mound was discovered, and mineralized sediments and rock were collected and analyzed. Silica-hematite mounds have not previously been found on...
Ichthyoplankton assemblages of coastal west-central Lake Erie and associated habitat characteristics
J.E. McKenna Jr., R. Douglas Hunter, M.C. Fabrizio, J.F. Savino, T. N. Todd, M. Bur
2008, Journal of Great Lakes Research (34) 755-769
Early life stage survival often determines fish cohort strength and that survival is affected by habitat conditions. The structure and dynamics of ichthyoplankton assemblages can tell us much about biodiversity and fish population dynamics, but are poorly understood in nearshore areas of the Great Lakes, where most spawning and nursery...
Cliff swallows Petrochelidon pyrrhonota as bioindicators of environmental mercury, Cache Creek Watershed, California
Roger L. Hothem, Bonnie S. Trejo, Marissa L. Bauer, John J. Crayon
2008, Archives of Environmental Contamination and Toxicology (55) 111-121
To evaluate mercury (Hg) and other element exposure in cliff swallows (Petrochelidon pyrrhonota), eggs were collected from 16 sites within the mining-impacted Cache Creek watershed, Colusa, Lake, and Yolo counties, California, USA, in 1997-1998. Nestlings were collected from seven sites in 1998. Geometric mean total Hg (THg) concentrations ranged from...
Decreased mortality of lake michigan chinook salmon after bacterial kidney disease challenge: Evidence for pathogen-driven selection?
M. K. Purcell, A.L. Murray, A. Elz, L.K. Park, S.V. Marcquenski, J. R. Winton, S.W. Alcorn, R.J. Pascho, D.G. Elliott
2008, Journal of Aquatic Animal Health (20) 225-235
In the late 1960s, Chinook salmon Oncorhynchus tshawytscha from the Green River, Washington, were successfully introduced into Lake Michigan. During spring from1988 to 1992, large fish die-offs affecting Chinook salmon occurred in the lake. Multiple ecological factors probably contributed to the severity of the fish kills, but the only disease...
Joint NOAA/NWS/USGS prototype debris flow warning system for recently burned areas in Southern California
P. Restrepo, D.P. Jorgensen, S.H. Cannon, J. Costa, J. Laber, Jon J. Major, B. Martner, J. Purpura, K. Werner
2008, Bulletin of the American Meteorological Society (89) 1845-1851
Debris flows, also known as mudslides, are composed gravity-driven mixtures of sediment and water that travel through steep channels, over open hillslopes, and the like. Addressing this issue, US Geological Survey (USGS) and NOAA have established a debris-flow warning system that has the ability to monitor and forecast precipitation and...
Hepatic minerals of white-tailed and mule deer in the southern Black Hills, South Dakota
T.J. Zimmerman, J.A. Jenks, David M. Leslie Jr., R.D. Neiger
2008, Journal of Wildlife Diseases (44) 341-350
Because there is a paucity of information on the mineral requirements of free-ranging deer, data are needed from clinically healthy deer to provide a basis for the diagnosis of mineral deficiencies. To our knowledge, no reports are available on baseline hepatic mineral concentrations from sympatric white-tailed deer (Odocoileus virginianus) and...
Evapotranspiration rates and crop coefficients for a restored marsh in the Sacramento-San Joaquin Delta, California, USA
Judith Z. Drexler, Frank E. Anderson, Richard L. Snyder
2008, Hydrological Processes (22) 725-735
The surface renewal method was used to estimate evapotranspiration (ET) for a restored marsh on Twitchell Island in the Sacramento–San Joaquin Delta, California, USA. ET estimates for the marsh, together with reference ET measurements from a nearby climate station, were used to determine crop coefficients over a 3‐year period during...
Environmental tracers as indicators of karst conduits in groundwater in South Dakota, USA
Andrew J. Long, J.F. Sawyer, L.D. Putnam
2008, Hydrogeology Journal (16) 263-280
Environmental tracers sampled from the carbonate Madison aquifer on the eastern flank of the Black Hills, South Dakota, USA indicated the approximate locations of four major karst conduits. Contamination issues are a major concern because these conduits are characterized by direct connections to sinking streams, high groundwater velocities, and proximity...
Restoration of mangrove plantations and colonisation by native species in Leizhou bay, South China
H. Ren, S. Jian, H. Lu, Q. Zhang, W. Shen, W. Han, Z. Yin, Q. Guo
2008, Ecological Research (23) 401-407
To examine the natural colonisation of native mangrove species into remediated exotic mangrove stands in Leizhou Bay, South China, we compared soil physical-chemical properties, community structure and recruitments of barren mangrove areas, native mangrove species plantations, and exotic mangrove species-Sonneratia apetala Buch.Ham-between plantations and natural forest. We found that severely...
Acetylene as fast food: Implications for development of life on anoxic primordial earth and in the outer solar system
R.S. Oremland, M.A. Voytek
2008, Astrobiology (8) 45-58
Acetylene occurs, by photolysis of methane, in the atmospheres of jovian planets and Titan. In contrast, acetylene is only a trace component of Earth's current atmosphere. Nonetheless, a methane-rich atmosphere has been hypothesized for early Earth; this atmosphere would also have been...
Integrated Fe- and S-isotope study of seafloor hydrothermal vents at East Pacific Rise 9-10°N
O. Rouxel, Wayne C. Shanks III, W. Bach, K.J. Edwards
2008, Chemical Geology (252) 214-227
In this study, we report on coupled Fe- and S-isotope systematics of hydrothermal fluids and sulfide deposits from the East Pacific Rise at 9–10°N to better constrain processes affecting Fe-isotope fractionation in hydrothermal environments. We aim to address three fundamental questions: (1) Is there significant Fe-isotope fractionation during sulfide precipitation?...
An hydrothermal experimental study of the cobalt-cobalt oxide redox buffer
K.H. Lemke, R.J. Rosenbauer, J. L. Bischoff, D.K. Bird
2008, Chemical Geology (252) 136-144
Equilibrium aqueous hydrogen concentration and corresponding energies of reaction, ??Grxno(T, P), for the reaction Co(s) + H2O(l) = CoO(s) + H2(aq) have been determined at temperatures between 256 and 355 ??C and at 400 bar. Steady-state concentrations of hydrogen were approached in experiments under conditions of both H2 excess and...
Population structure and genetic diversity of black redhorse (Moxostoma duquesnei) in a highly fragmented watershed
S.M. Reid, C.C. Wilson, N.E. Mandrak, L.M. Carl
2008, Conservation Genetics (9) 531-546
Dams have the potential to affect population size and connectivity, reduce genetic diversity, and increase genetic differences among isolated riverine fish populations. Previous research has reported adverse effects on the distribution and demographics of black redhorse (Moxostoma duquesnei), a threatened fish species in Canada. However, effects on genetic diversity and...
Hydrography and bottom boundary layer dynamics: Influence on inner shelf sediment mobility, Long Bay, North Carolina
L.A. Davis, L.A. Leonard, G.A. Snedden
2008, Southeastern Geology (45) 97-109
This study examined the hydrography and bottom boundary-layer dynamics of two typical storm events affecting coastal North Carolina (NC); a hurricane and the passages of two small consecutive extratropical storms during November 2005. Two upward-looking 1200-kHz Acoustic Doppler Current Profilers (ADCP) were deployed on the inner shelf in northern Long...
Mangrove forest distributions and dynamics in Madagascar (1975-2005)
S. Giri, J. Muhlhausen
2008, Sensors (8) 2104-2117
Mangrove forests of Madagascar are declining, albeit at a much slower rate than the global average. The forests are declining due to conversion to other land uses and forest degradation. However, accurate and reliable information on their present distribution and their rates, causes, and consequences of change have not been...
Advection, dispersion, and filtration of fine particles within emergent vegetation of the Florida Everglades
Y.H. Huang, J.E. Saiers, J. W. Harvey, G.B. Noe, S. Mylon
2008, Water Resources Research (44)
The movement of particulate matter within wetland surface waters affects nutrient cycling, contaminant mobility, and the evolution of the wetland landscape. Despite the importance of particle transport in influencing wetland form and function, there are few data sets that illuminate, in a quantitative way, the transport behavior of particulate matter...
Pathology, physiologic parameters, tissue contaminants, and tissue thiamine in morbid and healthy central Florida adult American alligators (Alligator mississippiensis)
D. C. Honeyfield, J.P. Ross, D.A. Carbonneau, S.P. Terrell, A.R. Woodward, T. R. Schoeb, H.F. Perceval, J. P. Hinterkopf
2008, Journal of Wildlife Diseases (44) 280-294
An investigation of adult alligator (Alligator mississippiensis) mortalities in Lake Griffin, central Florida, was conducted from 1998-2004. Alligator mortality was highest in the months of April and May and annual death count peaked in 2000. Bacterial pathogens, heavy metals, and pesticides were not linked with the mortalities. Blood chemistry did...
Use of volatile organic components in scat to identify canid species
E. Burnham, Louis C. Bender, G.A. Eiceman, K.M. Pierce, S. Prasad
2008, Journal of Wildlife Management (72) 792-797
Identification of wildlife species from indirect evidence can be an important part of wildlife management, and conventional +methods can be expensive or have high error rates. We used chemical characterization of the volatile organic constituents (VOCs) in scat as a method to identify 5 species of North American canids from...
Economic decision making and the application of nonparametric prediction models
Emil D. Attanasi, Timothy C. Coburn, Philip A. Freeman
2008, SPE Reservoir Evaluation and Engineering (11) 1089-1096
Sustained increases in energy prices have focused attention on gas resources in low-permeability shale or in coals that were previously considered economically marginal. Daily well deliverability is often relatively small, although the estimates of the total volumes of recoverable resources in these settings are often large. Planning and development decisions...
Tertiary tilting and dismemberment of the laramide arc and related hydrothermal systems, Sierrita Mountain, Arizona
W.J.A. Stavast, R.P. Butler, E. Seedorff, M.D. Barton, C.A. Ferguson
2008, Economic Geology (103) 629-636
Multiple lines of evidence, including new and published geologic mapping and paleomagnetic and geobarometric determinations, demonstrate that the rocks and large porphyry copper systems of the Sierrita Mountains in southern Arizona were dismembered and tilted 50?? to 60?? to the south by Tertiary normal faulting. Repetition of geologic features and...
Relative importance of natural disturbances and habitat degradation on snail kite population dynamics
J. Martin, W.M. Kitchens, Christopher E. Cattau, M.K. Oli
2008, Endangered Species Research (6) 25-39
Natural disturbances and habitat degradation are major factors influencing the dynamics and persistence of many wildlife populations, yet few large-scale studies have explored the relative influence of these factors on the dynamics and persistence of animal populations. We used longterm demographic data and matrix population models to examine the potential...
Late Pleistocene and Early Holocene lake-level fluctuations in the Lahontan Basin, Nevada: Implications for the distribution of archaeological sites
K.D. Adams, Thomas Goebel, K. Graf, G.M. Smith, A.J. Camp, R.W. Briggs, D. Rhode
2008, Geoarchaeology (23) 608-643
The Great Basin of the western U.S. contains a rich record of late Pleistocene and Holocene lake-level fluctuations as well as an extensive record of human occupation during the same time frame. We compare spatial-temporal relationships between these records in the Lahontan basin to consider whether lake-level fluctuations across the...
