Sap flow characteristics of neotropical mangroves in flooded and drained soils
Ken W. Krauss, P. Joy Young, Jim L. Chambers, Thomas W. Doyle, Robert R. Twilley
2007, Tree Physiology (27) 775-783
Effects of flooding on water transport in mangroves have previously been investigated in a few studies, most of which were conducted on seedlings in controlled settings. In this study, we used heat-dissipation sap probes to determine if sap flow (Js) attenuates with radial depth into the xylem of mature trees...
New isotopic evidence for the origin of groundwater from the Nubian Sandstone Aquifer in the Negev, Israel
A. Vengosh, S. Hening, J. Ganor, B. Mayer, C.E. Weyhenmeyer, T.D. Bullen, A. Paytan
2007, Applied Geochemistry (22) 1052-1073
The geochemistry and isotopic composition (H, O, S, Osulfate, C, Sr) of groundwater from the Nubian Sandstone (Kurnub Group) aquifer in the Negev, Israel, were investigated in an attempt to reconstruct the origin of the water and solutes, evaluate modes of water–rock interactions, and determine mean residence times of the...
Progress in the development of shallow-water mapping systems
E. Bergeron, C.R. Worley, T. O'Brien
2007, Sea Technology (48) 10-15
The USGS (US Geological Survey) Coastal and Marine Geology has deployed an advance autonomous shallow-draft robotic vehicle, Iris, for shallow-water mapping in Apalachicola Bay, Florida. The vehicle incorporates a side scan sonar system, seismic-reflection profiler, single-beam echosounder, and global positioning system (GPS) navigation. It is equipped with an onboard microprocessor-based...
Regional differences in size-at-age of the recovering burbot (Lota lota) population in Lake Erie
M.A. Stapanian, C.P. Madenjian, J. Tost
2007, Journal of Great Lakes Research (33) 91-102
The burbot Lota lota population in Lake Erie increased dramatically between 1995 and 2003, due mainly to control of the sea lamprey Petromyzon marinus, which began in the late 1980s. We estimated total length- and weight-at-age at capture for burbot caught in annual gillnet surveys of eastern Lake Erie during August 1994–2003. Mean...
State factor relationships of dissolved organic carbon and nitrogen losses from unpolluted temperate forest watersheds
S.S. Perakis, L. O. Hedin
2007, Journal of Geophysical Research G: Biogeosciences (112)
We sampled 100 unpolluted, old-growth forested watersheds, divided among 13 separate study areas over 5 years in temperate southern Chile and Argentina, to evaluate relationships among dominant soil-forming state factors and dissolved carbon and nitrogen concentrations in watershed streams. These watersheds provide a unique opportunity to examine broad-scale controls over...
Postfire soil burn severity mapping with hyperspectral image unmixing
P.R. Robichaud, S.A. Lewis, D.Y.M. Laes, A.T. Hudak, R.F. Kokaly, J.A. Zamudio
2007, Remote Sensing of Environment (108) 467-480
Burn severity is mapped after wildfires to evaluate immediate and long-term fire effects on the landscape. Remotely sensed hyperspectral imagery has the potential to provide important information about fine-scale ground cover components that are indicative of burn severity after large wildland fires. Airborne hyperspectral imagery and ground data were collected...
Spawning chronology, nest site selection and nest success of smallmouth bass during benign streamflow conditions
D.C. Dauwalter, W.L. Fisher
2007, American Midland Naturalist (158) 60-78
We documented the nesting chronology, nest site selection and nest success of smallmouth bass Micropterus dolomieu in an upstream (4th order) and downstream (5th order) reach of Baron Fork Creek, Oklahoma. Males started nesting in mid-Apr. when water temperatures increased to 16.9 C upstream, and in late-Apr. when temperatures increased...
Distributed energy-balance modeling of snow-cover evolution and melt in rugged terrain: Tobacco Root Mountains, Montana, USA
S.L. Letsinger, G.A. Olyphant
2007, Journal of Hydrology (336) 48-60
A distributed energy-balance model was developed for simulating snowpack evolution and melt in rugged terrain. The model, which was applied to a 43-km2 watershed in the Tobacco Root Mountains, Montana, USA, used measured ambient data from nearby weather stations to drive energy-balance calculations and to constrain the model of Liston...
Issues, benefits, and problems associated with fishing tournaments in inland waters of the United States: A survey of fishery agency administrators
H.L. Schramm Jr., K.M. Hunt
2007, Fisheries (32) 234-243
A web-based survey was administered to state fisheries agency administrators in 2005 to assess and prioritize the impacts of tournament fishing on management of inland fishery resources. Surveys were completed by fishery administrators of 48 state agencies and the District of Columbia. Respondents rated tournaments as neither strongly benefiting nor...
Development of a spatial analysis method using ground-based repeat photography to detect changes in the alpine treeline ecotone, Glacier National Park, Montana, U.S.A.
W. Roush, Jeffrey S. Munroe, D.B. Fagre
2007, Arctic, Antarctic, and Alpine Research (39) 297-308
Repeat photography is a powerful tool for detection of landscape change over decadal timescales. Here a novel method is presented that applies spatial analysis software to digital photo-pairs, allowing vegetation change to be categorized and quantified. This method is applied to 12 sites within the alpine treeline ecotone of Glacier...
Altered stream-flow regimes and invasive plant species: The Tamarix case
J.C. Stromberg, S.J. Lite, R. Marler, C. Paradzick, P.B. Shafroth, D. Shorrock, J. M. White, M.S. White
2007, Global Ecology and Biogeography (16) 381-393
Aim: To test the hypothesis that anthropogenic alteration of stream-flow regimes is a key driver of compositional shifts from native to introduced riparian plant species. Location: The arid south-western United States; 24 river reaches in the Gila and Lower Colorado drainage basins of Arizona. Methods: We compared the abundance of...
Origin of halite brine in the Onondaga Trough near Syracuse, New York State, USA: Modeling geochemistry and variable-density flow
Richard M. Yager, William M. Kappel, Niel Plummer
2007, Hydrogeology Journal (15) 1321-1339
Halite brine (saturation ranging from 45 to 80%) lies within glacial sediments that fill the Onondaga Trough, a bedrock valley deepened by Pleistocene glaciation near Syracuse, New York State, USA. The most concentrated brine occupies the northern end of the trough, about 10 km downgradient of the northern limit of...
Coralline alga reveals first marine record of subarctic North Pacific climate change
J. Halfar, R. Steneck, B. Schone, G.W.K. Moore, M. Joachimski, A. Kronz, J. Fietzke, James A. Estes
2007, Geophysical Research Letters (34)
While recent changes in subarctic North Pacific climate had dramatic effects on ecosystems and fishery yields, past climate dynamics and teleconnection patterns are poorly understood due to the absence of century-long high-resolution marine records. We present the first 117-year long annually resolved marine climate history from the western Bering Sea/Aleutian...
Mapping an invasive plant, Phragmites australis, in coastal wetlands using the EO-1 Hyperion hyperspectral sensor
Bruce Pengra, C.A. Johnston, Thomas R. Loveland
2007, Remote Sensing of Environment (108) 74-81
Mapping tools are needed to document the location and extent of Phragmites australis, a tall grass that invades coastal marshes throughout North America, displacing native plant species and degrading wetland habitat. Mapping Phragmites is particularly challenging in the freshwater Great Lakes coastal wetlands due to dynamic lake levels and vegetation...
Modern foraminiferal facies in a subtropical estuarine channel, Bertioga, São Paulo, Brazil
P.P.B. Eichler, B.B. Eichler, L. B. De Miranda, A.R. Rodrigues
2007, Journal of Foraminiferal Research (37) 234-247
Numerical analyses of modern foraminiferal abundance and environmental data from the Bertioga Channel (Sa??o Paulo, Brazil) reveal multiple biofacies within an overall paralic setting. Despite its fisheries, mariculture and attraction to tourists, the environmental state of Bertioga Channel remains poorly studied. The present investigation is an attempt to partly fill...
The science and practice of environmental flows and the role of hydrogeologists
M. Sophocleous
2007, Ground Water (45) 393-401
Conflicts between ecosystems and human needs for fresh water are increasing. The purpose of this paper is to raise awareness in the hydrogeologic community of environmental flows (EFs) and to address the major challenges involved in their protection. Ground water is a key component of EFs, and therefore hydrogeologists are...
Dynamics of CFCs in northern temperate lakes and adjacent groundwater
John F. Walker, David A. Saad, Randall J. Hunt
2007, Water Resources Research (43)
Three dimictic lakes and one meromictic lake in and near the Trout Lake, Wisconsin, watershed were sampled to determine the variation of chlorofluorocarbon (CFC) concentrations within the lakes. The lakes were sampled during stratified conditions, during fall turnover, and during ice cover. The results demonstrate a considerable variation in CFC...
Toxicity of 5% rotenone to nonindigenous Asian swamp eels
P. J. Schofield, L.G. Nico
2007, North American Journal of Fisheries Management (27) 453-459
Our primary goal was to determine whether rotenone would be a useful control against introduced populations of Asian swamp eels (family Synbranchidae, genus Monopterus). We report the results of a laboratory experiment comparing the efficacy of various rotenone concentrations (1, 2, 4, and 8 mg of 5% liquid rotenone/L of...
Seasonal fish community variation in headwater mangrove creeks in the southwestern everglades: An examination of their role as dry-down refuges
Jennifer S. Rehage, W.F. Loftus
2007, Conference Paper, Bulletin of Marine Science
The connectivity between the fish community of estuarine mangroves and that of freshwater habitats upstream remains poorly understood. In the Florida Everglades, mangrove-lined creeks link freshwater marshes to estuarine habitats downstream and may act as dry-season refuges for freshwater fishes. We examined seasonal dynamics in the fish community of ecotonal...
The feasibility of applying immature yard-waste compost to remove nitrate from agricultural drainage effluents: A preliminary assessment
L. Tsui, I.G. Krapac, William R. Roy
2007, Journal of Hazardous Materials (144) 585-589
Nitrate is a major agricultural pollutant found in drainage waters. Immature yard-waste compost was selected as a filter media to study its feasibility for removing nitrate from drainage water. Different operation parameters were tested to examine the denitrification efficiency, including the amounts of compost packed in columns, the flow rate,...
Barite-forming environments along a rifted continental margin, Southern California Borderland
James R. Hein, Robert A. Zierenberg, J. Barry Maynard, Mark D. Hannington
2007, Deep-Sea Research Part II: Topical Studies in Oceanography (54) 1327-1349
The Southern California Continental Borderland (SCCB) is part of the broad San Andreas transform-fault plate boundary that consists of a series of fault-bounded, petroleum-generating basins. The SCCB has high heat flow and geothermal gradients produced by thinned continental crust and Neogene volcanism. Barite deposits in the SCCB occur along faults.Barite...
Spatial and temporal geochemical trends in the hydrothermal system of Yellowstone National Park: Inferences from river solute fluxes
Shaul Hurwitz, Jacob B. Lowenstern, Henry Heasler
2007, Journal of Volcanology and Geothermal Research (162) 149-171
We present and analyze a chemical dataset that includes the concentrations and fluxes of HCO3−, SO42−, Cl−, and F− in the major rivers draining Yellowstone National Park (YNP) for the 2002–2004 water years (1 October 2001 – 30 September 2004). The total (molar) flux in all rivers decreases in the following...
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...
Introduced species and abiotic factors affect longitudinal variation in small fish assemblages in the Wind River watershed, Wyoming
P.S. Lionberger, W.A. Hubert
2007, Journal of Freshwater Ecology (22) 287-295
We assessed longitudinal variation in small fish assemblages in the Wind River watershed upstream from Boysen Reservoir, Wyoming and into the reservoir. Twenty-six species were found in the study area, and 12 of the species were believed to have been introduced since settlement by Europeans. Additions and losses of fish...
Restoration of wildcelery, Vallisneria americana Michx., in the lower Detroit River of the Lake Huron-Lake Erie Corridor
D. W. Schloesser, B.A. Manny
2007, Journal of Great Lakes Research (33) 8-19
American wildcelery (Vallisneria americana Michx.) is a valuable submersed aquatic plant that was negatively affected by pollution and urban runoff in the lower Detroit River for much of the 20th century. Following 25 years of water-pollution and urban-runoff abatement initiated in the early 1970s, we postulated that water clarity had...
