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Page 2387, results 59651 - 59675

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A simulation model of land-use change in the Lake Tahoe Basin of California and Nevada, as used in a decision-support system
Mark L. Hessenflow, David L. Halsing
2006, Conference Paper, Proceedings of 3rd International Congress on Environmental Modelling and Software - Burlington, Vermont, USA - July 2006
The Tahoe Land-Use Change model is a stochastic, spatially explicit simulation of future land-use change—in particular, development and retirement of individual parcels—in the Lake Tahoe Basin of California and Nevada. The Federal, State, and regional management agencies responsible for the basin are revising and integrating their 20-year plans to meet...
Wetland researchers on the hurricane front lines
Gregory J. Smith
2006, Book chapter, After the storm : restoring America's Gulf Coast wetlands : a special report of the National wetlands newsletter
Close proximity to the Gulf Coast and its expansive wetland ecosystem made Lafayette, Louisiana, a perfect site for the U.S. Geological Survey National Wetlands Research Center. This location also put the center at the edge of the hurricane impact zones. In the days following the storms, researchers became rescuers and...
Solute transport processes
A. Kemna, Andrew Binley, Frederick D. Day-Lewis, Andreas Englert, Bulent Tezkan, Jan Vanderborght, Harry Vereecken, Peter Winship
2006, Book chapter
Soils and aquifers are major compartments of the subsurface environment, which together control the terrestrial hydrological cycle. This subsurface is important for water resources and also as repository for municipal, industrial, and government waste. Aquifers are typically recharged by natural rainfall entering the soil profile and leaching into deeper soil...
Reproductive development in the sicklefin chub in the Missouri and Lower Yellowstone Rivers
Douglas J. Dieterman, Eric Roberts, Patrick J. Braaten, David L. Galat
2006, The Prairie Naturalist (38) 113-130
We describe aspects of sicklefin chub (Macrhybopsis meeki) reproductive development from three study areas encompassing greater than 2,700 km of the Missouri and Lower Yellowstone rivers. The sicklefin chub was collected between late July and early October in 1996 and 1997. A...
Distribution and morphological variation of Eleutherodactylus mercedesae Lynch & McDiarmid, 1987 (Amphibia, Anura, Leptodactylidae) with first record for Peru
J.M. Padial, R. McDiarmid, I. De la Riva
2006, Zootaxa (1278) 49-56
We report new distributional information for Eleutherodactylus mercedesae in Bolivia, and provide the first record for Peru based on an adult female. This species, previously endemic to Bolivia, now ranges across about 1000 km in cloud forests on the Amazonian slopes of the Andes from southern Peru to central Bolivia. We provide the...
Fate and effects of nitrogen and phosphorus in shallow vegetated aquatic ecosystems
James F. Fairchild, Leigh Ann Vradenburg
2006, Report
Nitrate concentrations have greatly increased in streams and rivers draining agricultural regions of the Midwestern United States, increasing nitrate transport to the Gulf of Mexico has been implicated in the hypoxic conditions that threaten the productivity of marine fisheries. Increases in nitrate concentrations have been attributed to a combination of...
Basic alumina flash chromatographic separation of bulk ortho-PCBs from on-ortho-PCBs, PBDEs, PCDFs, PCDDs, PCDTs, OCPs, and PCTs
Paul H. Peterman, Carl E. Orazio, Kathy R. Echols
2006, Organohalogen Compounds (68) 2458-2461
Comprising nearly 100 congeners in environmental samples, PCBs are often still prevalent in concentrations exceeding 1 μg/g. To effectively measure PCBs, they are isolated as a group from other persistent organic pollutants using silica gel, Florisil, or alumina column chromatography for analysis by GC/MS or dual capillary column GC/ECD. When...
Response of Everglades tree islands to environmental change
Debra A. Willard, Christopher E. Bernhardt, Charles W. Holmes, Bryan Landacre, Marci E. Marot
2006, Ecological Monographs (76) 565-583
Tree islands are centers of biodiversity within the Florida Everglades, USA, but the factors controlling their distribution, formation, and development are poorly understood. We use pollen assemblages from tree islands throughout the greater Everglades ecosystem to reconstruct the timing of tree island formation, patterns of development, and response to specific...
Relations among pH, sulfate, and metals concentrations in anthracite and bituminous coal-mine discharges, Pennsylvania
III Cravotta
2006, Conference Paper, Proceedings: 23rd Annual Meeting of the ASMR, March 26-30, 2006, St. Louis, Missouri
Water-quality data for discharges from 140 abandoned mines in the Bituminous and Anthracite Coalfields of Pennsylvania illustrate relations among pH, sulfate, and dissolved metal concentrations. The pH for the 140 samples ranged from 2.7 to 7.3, with two modes at pH 2.5 to 4 (acidic) and 6 to 7 (near...
Physical properties of pressurized sediment from hydrate ridge
William J. Winters, William F. Waite, David H. Mason, Lauren Gilbert
2006, Report, Proceedings of the Ocean Drilling Program, Scientific Results
As part of an ongoing laboratory study, preliminary acoustic, triaxial strength, and electrical resistivity results are presented from a test performed on a clayey silt sediment sample recovered from Site 1249 at the summit of southern Hydrate Ridge during Ocean Drilling Program Leg 204. The test specimen was stored and...
Inventory of montane-nesting birds in the Arctic Network of National Parks, Alaska
T. Lee Tibbitts, Daniel R. Ruthrauff, Robert E. Gill Jr., Colleen M. Handel
2006, Report
The Alaska Science Center of the U.S. Geological Survey conducted an inventory of birds in montane areas of the four northern parks in the Arctic Network of National Parks, Alaska. This effort represents the first comprehensive assessment of breeding range and habitat associations for the majority of avian species in...
Development of airborne remote sensing methods for surveys of Pacific walrus
Douglas M. Burn, Mark S. Udevitz, M.A. Webber, Joel L. Garlich-Miller
2006, BOEM MMS 2006-003
In April 2003, we conducted an operational test of an airborne multispectral scanner (AMS) over pack ice in the Bering Sea to evaluate the potential of this system as a survey tool for Pacific walruses. We scanned a total of 28,875 km2 of sea ice habitat at a spatial resolution...