Eutrophication study at the Panjiakou-Daheiting Reservoir system, northern Hebei Province, People's Republic of China: Chlorophyll-a model and sources of phosphorus and nitrogen
Joseph L. Domagalski, Chao Lin, Yang Luo, Jie Kang, Shaoming Wang, Larry R. Brown, Mark D. Munn
2007, Agricultural Water Management (94) 43-53
Concentrations, loads, and sources of nitrate and total phosphorus were investigated at the Panjiakou and Daheiting Reservoir system in northern Hebei Province, People's Republic of China. The Luan He River is the primary source of water to these reservoirs, and the upstream watershed has a mix of land uses including...
The geochemistry of pesticides
Jack E. Barbash
2007, Book chapter, Treatise on geochemistry
The mid-1970s marked a major turning point in human history, for it was at that moment that the ability of the Earth’s ecosystems to absorb most of the biological impacts of human activities appears to have been exceeded by the magnitude of those impacts. This conclusion is based partly upon...
Diet composition of larval and young-of-year shovelnose sturgeon in the Upper Missouri River
P. J. Braaten, D.B. Fuller, N.D. McClenning
2007, Journal of Applied Ichthyology (23) 516-520
Obtaining food following the transition from endogenous to exogenous feeding and during the first year of life is a critical event that strongly influences growth and survival of young-of-year fishes. For shovelnose sturgeon Scaphirhynchus platorynchus, limited information is available on food habits during the first year of life. The objective of...
Spatial and temporal structure of macroinvertebrate assemblages, San Francisco Bay salt ponds
A.K. Miles, S.E. Spring, M.A. Ricca, J.T. Takekawa, N.D. Athearn, D. H. Schoellhamer
2007, Conference Paper, Society of Wetland Scientists International Conference
No abstract available....
Mercury in sediments, Alviso and Eden Landing salt ponds, south San Francisco Bay, California
A.K. Miles, M.A. Ricca, S.E. Spring, C. Morris, C. Wilcox, T. Maurer
2007, Conference Paper, Proceedings, Society of Wetland Scientists International Conference
No abstract available....
Multi-frequency ground-penetrating radar method for revealing complex sedimentary facies
A.J. Delaney, J. Horsman, M.L. Prentice, S.A. Arcone
2007, Conference Paper, Proceedings of the 2007 4th International Workshop on Advanced Ground Penetrating Radar, IWAGPR 2007
We attempted to resolve deltaic facies in Taylor Valley, Antarctica by using pulses centered near 120, 300 and 880 MHz, the latter of which has not yet been tried in this setting, The 120 MHz profiles clearly defined gross material changes, while the 300 MHz profiles added significant resolution to...
Microcystin distribution in physical size class separations of natural plankton communities
J.L. Graham, J.R. Jones
2007, Lake and Reservoir Management (23) 161-168
Phytoplankton communities in 30 northern Missouri and Iowa lakes were physically separated into 5 size classes (>100 µm, 53-100 µm, 35-53 µm, 10-35 µm, 1-10 µm) during 15-21 August 2004 to determine the distribution of microcystin (MC) in size fractionated lake samples and assess how net collections influence estimates of...
Seasonal movements and environmental conditions experienced by Pacific halibut in the Bering Sea, examined by pop-up satellite tags
Andrew C. Seitz, Timothy Loher, Jennifer L. Nielsen
2007, Scientific Report of the International Pacific Halibut Commission 84
Currently, Pacific halibut are managed as one population extending from California to the Bering Sea. However, we hypothesize that a spawning subpopulation of Pacific halibut exists in the Bering Sea. In this study, we examined the seasonal migration and depth-specific behavior of Pacific halibut in the Bering Sea, which serve...
A simple model for calculating tsunami flow speed from tsunami deposits
B. E. Jaffe, G. Gelfenbuam
2007, Sedimentary Geology (200) 347-361
This paper presents a simple model for tsunami sedimentation that can be applied to calculate tsunami flow speed from the thickness and grain size of a tsunami deposit (the inverse problem). For sandy tsunami deposits where grain size and thickness vary gradually...
Investigation of reductive dechlorination supported by natural organic carbon
Heather V. Rectanus, Mark A. Widdowson, Francis H. Chapelle, C.A. Kelly, John T. Novak
2007, Ground Water Monitoring and Remediation (27) 53-62
Because remediation timeframes using monitored natural attenuation may span decades or even centuries at chlorinated solvent sites, new approaches are needed to assess the long-term sustainability of reductive dechlorination in ground water systems. In this study, extraction procedures were used to investigate the mass of indigenous organic carbon in aquifer...
Postearthquake relaxation and aftershock accumulation linearly related after the 2003 M 6.5 Chengkung, Taiwan, and the 2004 M 6.0 Parkfield, California, earthquakes
J.C. Savage, S.-B. Yu
2007, Bulletin of the Seismological Society of America (97) 1632-1645
We treat both the number of earthquakes and the deformation following a mainshock as the superposition of a steady background accumulation and the postearthquake process. The preseismic displacement and seismicity rates ru and rE are used as estimates of the background rates. Let t be the time after the...
Mid-Pliocene planktic foraminifer assemblage of the North Atlantic Ocean
H.J. Dowsett, M.M. Robinson
2007, Micropaleontology (53) 105-126
The US Geological Survey Pliocene Research, Interpretation and Synoptic Mapping (PRISM) North Atlantic faunal data set provides a unique, temporally constrained perspective to document and evaluate the quantitative geographic distribution of key mid-Pliocene taxa. Planktic foraminifer census data from within the PRISM time slab (3.29 to 2.97 Ma) at thirteen...
Transport and degradation of chlorofluorocarbons (CFCs) in the pyritic Rabis Creek aquifer, Denmark
K. Hinsby, Anker L. Højberg, P. Engesgaard, K.H. Jensen, F. Larsen, Niel Plummer, Eurybiades Busenberg
2007, Water Resources Research (43)
Vertical profiles of the chlorofluorocarbons CFC‐11, CFC‐12, and CFC‐113 penetrating aerobic and anaerobic parts of a shallow sandy aquifer show that the CFC gases are degraded in the <1 m thick transition zone from aerobic to anaerobic groundwater in a pyritic sand aquifer at Rabis Creek, Denmark. Two‐dimensional solute transport...
Near-fault peak ground velocity from earthquake and laboratory data
Art McGarr, Joe B. Fletcher
2007, Bulletin of the Seismological Society of America (97) 1502-1510
We test the hypothesis that peak ground velocity (PGV) has an upper bound independent of earthquake magnitude and that this bound is controlled primarily by the strength of the seismogenic crust. The highest PGVs, ranging up to several meters per second, have been measured at sites within a few kilometers...
Geochemistry of rare earth elements in Permian coals from the Huaibei Coalfield, China
Lingyun Zheng, Gaisheng Liu, C. L. Chou, C. Qi, Y. Zhang
2007, Journal of Asian Earth Sciences (31) 167-176
The rare earth elements (REEs) in coals are important because of: (a) REE patterns can be an indicator of the nature of source rocks of the mineral matter as well as sedimentary environments; (b) REEs abundance in coal may have industrial-significance. In this study, a total of thirty-four samples of...
Improving GPR image resolution in lossy ground using dispersive migration
C.P. Oden, M.H. Powers, D.L. Wright, G.R. Olhoeft
2007, Conference Paper, IEEE Transactions on Geoscience and Remote Sensing
As a compact wave packet travels through a dispersive medium, it becomes dilated and distorted. As a result, ground-penetrating radar (GPR) surveys over conductive and/or lossy soils often result in poor image resolution. A dispersive migration method is presented that combines an inverse dispersion filter with frequency-domain migration. The method...
Analysis of multiple enteric viral targets as sewage markers in coral reefs
Erin K. Lipp, J. Carrie Futch, Dale W. Griffin
2007, Marine Pollution Bulletin (54) 1897-1902
Water and coral mucus samples were collected from throughout the Florida Keys National Marine Sanctuary and the Dry Tortugas for three years and were analyzed for human enteric viruses (enteroviruses, noroviruses, hepatitis A virus and adenoviruses) as conservative markers of human sewage using molecular methods. Of the 100 coral and...
Effects of two sediment types on the fluorescence yield of two Hawaiian scleractinian corals
G.A. Piniak
2007, Marine Environmental Research (64) 456-468
This study used non-invasive pulse-amplitude modulated (PAM) fluorometry to measure the maximum fluorescence yield (Fv/Fm) of two Hawaiian scleractinian coral species exposed to short-term sedimentation stress. Beach sand or harbor mud was applied to coral fragments in a flow-through aquarium system for 0-45 h, and changes in Fv/Fm were measured...
Population status of North American green sturgeon, Acipenser medirostris
P.B. Adams, C. Grimes, J.E. Hightower, S.T. Lindley, M.L. Moser, M.J. Parsley
2007, Environmental Biology of Fishes (79) 339-356
North American green sturgeon, Acipenser medirostris, was petitioned for listing under the Endangered Species Act (ESA). The two questions that need to be answered when considering an ESA listing are; (1) Is the entity a species under the ESA and if so (2) is the "species" in danger of extinction...
Anthropogenic impacts on American eel demographics in Hudson River tributaries, New York
L.S. Machut, K.E. Limburg, R.E. Schmidt, D. Dittman
2007, Transactions of the American Fisheries Society (136) 1699-1713
Populations of American eel Anguilla rostrata along the eastern coast of North America have declined drastically for largely unknown reasons. We examined the population dynamics of American eels in six tributaries of the Hudson River, New York, to quantify their distribution and the impacts of anthropogenic stressors. With up to...
First evidence of egg deposition by walleye (Sander vitreus) in the Detroit River
B.A. Manny, G.W. Kennedy, J.D. Allen, J. R. P. French III
2007, Journal of Great Lakes Research (33) 512-516
The importance of fish spawning habitat in channels connecting the Great Lakes to fishery productivity in those lakes is poorly understood and has not been adequately documented. The Detroit River is a reputed spawning and nursery area for many fish, including walleye (Sander vitreus) that migrate between adjacent Lakes Erie...
The 3D fault and vein architecture of strike-slip releasing- and restraining bends: Evidence from volcanic-centre-relatedmineral deposits
B. R. Berger
Cunningham W.D.Mann P., editor(s)
2007, Conference Paper, Geological Society Special Publication
High-temperature, volcanic-centre-related hydrothermal systems involve large fluid-flow volumes and are observed to have high discharge rates in the order of 100-400 kg/s. The flows and discharge occur predominantly on networks of critically stressed fractures. The coupling of hydrothermal fluid flow with deformation produces the volumes of veins found in epithermal...
Fatty acid signatures of stomach oil and adipose tissue of northern fulmars (Fulmarus glacialis) in Alaska: Implications for diet analysis of Procellariiform birds
S.W. Wang, S.J. Iverson, A.M. Springer, Scott A. Hatch
2007, Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology (177) 893-903
Procellariiforms are unique among seabirds in storing dietary lipids in both adipose tissue and stomach oil. Thus, both lipid sources are potentially useful for trophic studies using fatty acid (FA) signatures. However, little is known about the relationship between FA signatures in stomach oil and adipose tissue of individuals or...
Hydrology and subsurface transport of oil-field brine at the U.S. Geological Survey OSPER site "A", Osage County, Oklahoma
William N. Herkelrath, Yousif K. Kharaka, James J. Thordsen, Marvin M. Abbott
2007, Applied Geochemistry (22) 2155-2163
Spillage and improper disposal of saline produced water from oil wells has caused environmental damage at thousands of sites in the United States. In order to improve understanding of the fate and transport of contaminants at these sites, the U.S. Geological...
Testing ecological and behavioral correlates of nest predation
J.J. Fontaine, M. Martel, H.M. Markland, Alina M. Niklison, Karie L. Decker, T. E. Martin
2007, Oikos (116) 1887-1894
Variation in nest predation rates among bird species are assumed to reflect differences in risk that are specific to particular nest sites. Theoretical and empirical studies suggest that parental care behaviors can evolve in response to nest predation risk and thereby differ among ecological conditions that vary in inherent risk....
