Role of chemotaxis in the transport of bacteria through saturated porous media
R.M. Ford, Ronald W. Harvey
2007, Advances in Water Resources (30) 1608-1617
Populations of chemotactic bacteria are able to sense and respond to chemical gradients in their surroundings and direct their migration toward increasing concentrations of chemicals that they perceive to be beneficial to their survival. It has been suggested that this phenomenon may facilitate bioremediation processes by bringing bacteria into closer...
Effect of bedrock permeability on subsurface stormflow and the water balance of a trenched hillslope at the Panola Mountain Research Watershed, Georgia, USA
Meerveld Tromp-van H. J., N.E. Peters, Jeffery J. McDonnell
2007, Hydrological Processes (21) 750-769
The effect of bedrock permeability on subsurface stormflow initiation and the hillslope water balance is poorly understood. Previous hillslope hydrological studies at the Panola Mountain Research Watershed (PMRW), Georgia, USA, have assumed that the bedrock underlying the trenched hillslope is effectively impermeable. This paper presents a series of sprinkling experiments...
Developing a flood monitoring system from remotely sensed data for the Limpopo basin
Kwabena Asante, R.D. Macuacua, Guleid A. Artan, R.W. Lietzow, James Verdin
2007, IEEE Transactions on Geoscience and Remote Sensing (45) 1709-1714
This paper describes the application of remotely sensed precipitation to the monitoring of floods in a region that regularly experiences extreme precipitation and flood events, often associated with cyclonic systems. Precipitation data, which are derived from spaceborne radar aboard the National Aeronautics and Space Administration's Tropical Rainfall Measuring Mission and...
Occurrence and nest survival of four thrush species on a managed central Appalachian forest
R.L. Dellinger, Petra B. Wood, P.D. Keyser
2007, Forest Ecology and Management (243) 248-258
The wood thrush (Hylocichla mustelina Gmelin) is a species of concern in the central Appalachians, and is sympatric there with three related species, the American robin (Turdus migratorius Linnaeus), hermit thrush (Catharus guttatus Pallas), and veery (Catharus fuscescens Stephens). Our objectives were to quantify use of mature forests and areas...
Using a coupled eco-hydrodynamic model to predict habitat for target species following dam removal
C.A. Tomsic, T.C. Granata, R.P. Murphy, C.J. Livchak
2007, Ecological Engineering (30) 215-230
A habitat suitability index (HSI) model was developed for a water quality sensitive fish (Greater Redhorse) and macroinvertebrate (Plecoptera) species to determine the restoration success of the St. John Dam removal for the Sandusky River (Ohio). An ArcGIS?? model was created for pre- and post-dam removal scenarios. Inputs to the...
Factors to consider for trace element deposition biomonitoring surveys with lichen transplants
S. Ayrault, R. Clochiatti, F. Carrot, L. Daudin, J. R. Bennett
2007, Science of the Total Environment (372) 717-727
A trace element deposition biomonitoring experiment with transplants of the fruticose lichen Evernia prunastri was developed, aimed at monitoring the effects of different exposure parameters (exposure orientation and direct rain) and to the elements Ti, V, Cr, Co, Cu, Zn, Rb, Cd, Sb and Pb. Accumulations were observed for most...
Investigators share improved understanding of the North American carbon cycle
R.A. Birdsey, R. A. Cook, S. Denning, P. C. Griffith, Ben E. Law, J. G. Masek, A. Michalak, S. Ogle, D. S. Ojima, Y. Pan, C. Sabine, E. Sheffner, E. Sundquist
2007, Conference Paper, Eos
[No abstract available]...
The geology of the Morro Velho gold deposit in the Archean Rio das Velhas greenstone belt, Quadrilátero Ferrífero, Brazil
Diogenes Scipioni Vial, Ed Dewitt, Lydia Maria Lobato, Charles H. Thorman
2007, Ore Geology Reviews (32) 511-542
The Morro Velho gold deposit, Quadrilátero Ferrífero region, Minas Gerais, Brazil, is hosted by rocks at the base of the Archean Rio das Velhas greenstone belt. The deposit occurs within a thick carbonaceous phyllite package, containing intercalations of felsic and intermediate volcaniclastic rocks and dolomites. Considering the temporal and spatial...
Tracking environmental dynamics and agricultural intensification in southern Mali
G. Gray Tappan, Mike McGahuey
2007, Agricultural Systems (94) 38-51
The Office de la Haute Vallée du Fleuve Niger (OHVN) zone in southern Mali is a small but important agricultural production region. Against a background of environmental degradation including decades of declining rainfall, soil erosion, and human pressure on forest resources, numerous farming communities stand out through the use of...
Do females trade copulations for food? An experimental study on kittiwakes (Rissa tridactyla)
Bart Kempenaers, Richard Lanctot, V.A. Gill, Scott A. Hatch, Mihai Valcu
2007, Behavioral Ecology (18) 345-353
Females of many species copulate more frequently than necessary to fertilize their eggs despite the potential costs. Several studies, particularly on socially monogamous birds, have suggested that females obtain immediate material benefits by trading copulations for nutrients or other resources. We experimentally tested this hypothesis by manipulating the food resources...
Stress orientations of Taiwan Chelungpu-Fault Drilling Project (TCDP) hole-A as observed from geophysical logs
H.-Y. Wu, K.-F. Ma, M. Zoback, N. L. Boness, H. Ito, J.-H. Hung, S. Hickman
2007, Geophysical Research Letters (34)
[1] The Taiwan Chelungpu-fault Drilling Project (TCDP) drilled a 2-km-deep research borehole to investigate the structure and mechanics of the Chelungpu Fault that ruptured in the 1999 Mw 7.6 Chi-Chi earthquake. Geophysical logs of the TCDP were carried out over depths of 500–1900 m, including Dipole Sonic...
Sediment delivery after a wildfire
Steven L. Reneau, D. Katzman, G.A. Kuyumjian, A. Lavine, Daniel V. Malmon
2007, Geology (35) 151-154
We use a record of sedimentation in a small reservoir within the Cerro Grande burn area, New Mexico, to document postfire delivery of ash, other fine-grained sediment carried in suspension within floods, and coarse-grained sediment transported as bedload over a five-year period. Ash...
Food availability affects the maternal transfer of androgens and antibodies into eggs of a colonial seabird
J. Gasparini, T. Boulinier, V.A. Gill, D. Gil, Scott A. Hatch, A. Roulin
2007, Journal of Evolutionary Biology (20) 874-880
Mothers can improve the quality of their offspring by increasing the level of certain components in their eggs. To examine whether or not mothers increase deposition of such components in eggs as a function of food availability, we food‐supplemented black‐legged kittiwake females (Rissa tridactyla) before and during egg laying and...
An evaluation of freshwater mussel toxicity data in the derivation of water quality guidance and standards for copper
F.A. March, F.J. Dwyer, T. Augspurger, Christopher G. Ingersoll, N. Wang, C.A. Mebane
2007, Environmental Toxicology and Chemistry (26) 2066-2074
The state of Oklahoma has designated several areas as freshwater mussel sanctuaries in an attempt to provide freshwater mussel species a degree of protection and to facilitate their reproduction. We evaluated the protection afforded freshwater mussels by the U.S. Environmental Protection Agency (U.S. EPA) hardness-based 1996 ambient copper water quality...
Profiling refined hydrocarbon fuels using polar components
Colleen E. Rostad, Frances D. Hostettler
2007, Environmental Forensics (8) 129-137
Identification of a fuel released into the environment can be difficult due to biodegradation or weathering. Negative electrospray ionization/mass spectrometry was used to screen for unique polar components in a wide variety of commercial hydrocarbon products and mixtures. These fuels produced unique and relatively simple spectra. When applied to hydrocarbon...
Evaluation of seven aquatic sampling methods for amphibians and other aquatic fauna
Margaret S. Gunzburger
2007, Applied Herpetology (4) 47-63
To design effective and efficient research and monitoring programs researchers must have a thorough understanding of the capabilities and limitations of their sampling methods. Few direct comparative studies exist for aquatic sampling methods for amphibians. The objective of this study was to simultaneously employ seven aquatic sampling methods in 10...
Climate correlates of 20 years of trophic changes in a high-elevation riparian system
T. E. Martin
2007, Ecology (88) 367-380
The consequences of climate change for ecosystem structure and function remain largely unknown. Here, I examine the ability of climate variation to explain long-term changes in bird and plant populations, as well as trophic interactions in a high-elevation riparian system in central Arizona, USA, based on 20 years of study....
Lack of size selectivity for paddlefish captured in hobbled gillnets
G.D. Scholten, Phillip William Bettoli
2007, Fisheries Research (83) 355-359
A commercial fishery for paddlefish Polyodon spathula caviar exists in Kentucky Lake, a reservoir on the lower Tennessee River. A 152-mm (bar-measure) minimum mesh size restriction on entanglement gear was enacted in 2002 and the minimum size limit was increased to 864 mm eye-fork length to reduce the possibility of...
Bora event variability and the role of air-sea feedback
J. Pullen, J.D. Doyle, T. Haack, C. Dorman, R. P. Signell, C.M. Lee
2007, Journal of Geophysical Research C: Oceans (112)
A two-way interacting high resolution numerical simulation of the Adriatic Sea using the Navy Coastal Ocean Model (NCOM) and Coupled Ocean/ Atmosphere Mesoscale Prediction System (COAMPS??) was conducted to improve forecast momentum and heat flux fields, and to evaluate surface flux field differences for two consecutive bora events during February...
Characterizing a December 2005 density current event in the Chicago River, Chicago, Illinois
C.M. Garcia, P.R. Jackson, K. A. Oberg, K. Johnson, M.H. Garcia
2007, Conference Paper, Examining the Confluence of Environmental and Water Concerns - Proceedings of the World Environmental and Water Resources Congress 2006
During the winter months, the Chicago River in Chicago, Illinois is subject to bi-directional flows, and density currents are thought to be responsible for these flow variations. This paper presents detailed field measurements using three acoustic Doppler current profiler instruments and simultaneous water-quality measurements made during December 2005. Observations indicate...
Population dynamics and angler exploitation of the unique muskellunge population in Shoepack Lake, Voyageurs National Park, Minnesota
N.K. Frohnauer, Clay Pierce, L.W. Kallemeyn
2007, North American Journal of Fisheries Management (27) 63-76
A unique population of muskellunge Esox masquinongy inhabits Shoepack Lake in Voyageurs National Park, Minnesota. Little is known about its status, dynamics, and angler exploitation, and there is concern for the long-term viability of this population. We used intensive sampling and mark-recapture methods to quantify abundance, survival, growth, condition, age...
Diel mercury-concentration variations in streams affected by mining and geothermal discharge
David Nimick, R. Blaine McCleskey, Christopher H. Gammons, Tom E. Cleasby, S.R. Parker
2007, Science of the Total Environment (373) 344-355
Diel variations of concentrations of unfiltered and filtered total Hg and filtered methyl Hg were documented during 24-h sampling episodes in water from Silver Creek, which drains a historical gold-mining district near Helena, Montana, and the Madison River, which drains the geothermal system of Yellowstone National Park. The concentrations of...
Field evaluation of shallow-water acoustic doppler current profiler discharge measurements
M.S. Rehmel
2007, Conference Paper, Examining the Confluence of Environmental and Water Concerns - Proceedings of the World Environmental and Water Resources Congress 2006
In 2004, the U.S. Geological Survey (USGS) Office of Surface Water staff and USGS Water Science employees began testing the StreamPro, an acoustic Doppler current profiler (ADCP) for shallow-water discharge measurements. Teledyne RD Instruments introduced the StreamPro in December of 2003. The StreamPro is designed to make a "moving boat"...
Effects of upland disturbance and instream restoration on hydrodynamics and ammonium uptake in headwater streams
B.J. Roberts, P. J. Mulholland, J.N. Houser
2007, Journal of the North American Benthological Society (26) 38-53
Delivery of water, sediments, nutrients, and organic matter to stream ecosystems is strongly influenced by the catchment of the stream and can be altered greatly by upland soil and vegetation disturbance. At the Fort Benning Military Installation (near Columbus, Georgia), spatial variability in intensity of military training results in a...
Conditions for coexistence of freshwater mussel species via partitioning of fish host resources
Brenda Rashleigh, Donald L. DeAngelis
2007, Ecological Modelling (201) 171-178
Riverine freshwater mussel species can be found in highly diverse communities where many similar species coexist. Mussel species potentially compete for food and space as adults, and for fish host resources during the larval (glochidial) stage. Resource partitioning at the larval stage may promote coexistence. A model of resource utilization...
