Application of a coupled ecosystem-chemical equilibrium model, DayCent-Chem, to stream and soil chemistry in a Rocky Mountain watershed
M.D. Hartman, Jill Baron, D.S. Ojima
2007, Ecological Modelling (200) 493-510
Atmospheric deposition of sulfur and nitrogen species have the potential to acidify terrestrial and aquatic ecosystems, but nitrate and ammonium are also critical nutrients for plant and microbial productivity. Both the ecological response and the hydrochemical response to atmospheric deposition are of interest to regulatory and land management agencies. We...
Rolling across the roof of the world
J.C. Cobb, L. Wang, E.W. Woolery, Z. Wang, Z. Wu
2007, Geotimes (52) 24-27
[No abstract available]...
Nesting ecology of boreal forest birds following a massive outbreak of spruce beetles
Steven M. Matsuoka, Colleen M. Handel
2007, Journal of Wildlife Management (71) 51-63
We studied breeding dark-eyed juncos (Junco hyemalis), yellow-rumped warblers (Dendroica coronata), and spruce-nesting birds from 1997 to 1998 among forests with different levels of spruce (Picea spp.) mortality following an outbreak of spruce beetles (Dendroctonus rufipennis) in Alaska, USA. We identified species using live and beetle-killed spruce for nest sites and...
Reach‐averaged sediment routing model of a canyon river
S.M. Wiele, P.R. Wilcock, P.E. Grams
2007, Water Resources Research (43)
Spatial complexity in channel geometry indicates that accurate prediction of sediment transport requires modeling in at least two dimensions. However, a one‐dimensional model may be the only practical or possible alternative, especially for longer river reaches of practical concern in river management or landscape modeling. We have developed a one‐dimensional...
Riparian vegetation patterns in relation to fluvial landforms and channel evolution along selected rivers of Tuscany (Central Italy)
C.R. Hupp, M. Rinaldi
2007, Annals of the Association of American Geographers (97) 12-30
Riparian vegetation distribution patterns and diversity relative to various fluvial geomorphic channel patterns, landforms, and processes are described and interpreted for selected rivers of Tuscany, Central Italy; with emphasis on channel evolution following human impacts. Field surveys were conducted along thirteen gauged reaches for species presence, fluvial landforms, and the...
The geochemistry of groundwater resources in the Jordan Valley: The impact of the Rift Valley brines
E. Farber, A. Vengosh, I. Gavrieli, Amarisa Marie, T.D. Bullen, B. Mayer, A. Polak, U. Shavit
2007, Applied Geochemistry (22) 494-514
The chemical composition of groundwater in the Jordan Valley, along the section between the Sea of Galilee and the Dead Sea, is investigated in order to evaluate the origin of the groundwater resources and, in particular, to elucidate the role of...
Effect of temperature, hydraulic residence time and elevated PCO2 on acid neutralization within a pulsed limestone bed reactor
B.J. Watten, P.C. Lee, P.L. Sibrell, M.B. Timmons
2007, Water Research (41) 1207-1214
Limestone has potential for reducing reagent costs and sludge volume associated with treatment of acid mine drainage, but its use is restricted by slow dissolution rates and the deposition of Fe, Al and Mn-based hydrolysis products on reactive surfaces. We evaluated a pulsed limestone bed (PLB) reactor (15 L/min capacity)...
Responses of hydrochemical inorganic ions in the rainfall-runoff processes of the experimental catchments and its significance for tracing
W.-Z. Gu, J.-J. Lu, X. Zhao, N.E. Peters
2007, Shuikexue Jinzhan/Advances in Water Science (18) 1-7
Aimed at the rainfall-runoff tracing using inorganic ions, the experimental study is conducted in the Chuzhou Hydrology Laboratory with special designed experimental catchments, lysimeters, etc. The various runoff components including the surface runoff, interflow from the unsaturated zone and the groundwater flow from saturated zone were monitored hydrometrically. Hydrochemical inorganic...
Microplate model for the present-day deformation of Tibet
W. Thatcher
2007, Journal of Geophysical Research B: Solid Earth (112)
[1] Site velocities from 349 Global Positioning System (GPS) stations are used to construct an 11-element quasi-rigid block model of the Tibetan Plateau and its surroundings. Rigid rotations of five major blocks are well determined, and average translation velocities of six smaller blocks can be constrained....
Electrofishing capture probability of smallmouth bass in streams
D.C. Dauwalter, W.L. Fisher
2007, North American Journal of Fisheries Management (27) 162-171
Abundance estimation is an integral part of understanding the ecology and advancing the management of fish populations and communities. Mark-recapture and removal methods are commonly used to estimate the abundance of stream fishes. Alternatively, abundance can be estimated by dividing the number of individuals sampled by the probability of capture....
First report of Jefferson's ground sloth (Megalonyx jeffersonii) in North Dakota: Paleobiogeographical and paleoecological significance
J.W. Hoganson, H. Gregory McDonald
2007, Journal of Mammalogy (88) 73-80
A well-preserved ungual of a pes documents the presence of Jefferson's ground sloth (Megalonyx jeffersonii) at the end of the Wisconsinan in North Dakota. This is the 1st report of M. jeffersonii in North Dakota, and one of few records from the upper Great Plains. An accelerator mass spectrometer radiocarbon...
Shorebird abundance and distribution on the coastal plain of the Arctic National Wildlife Refuge
S. Brown, J. Bart, Richard B. Lanctot, J. A. Johnson, S. Kendall, D. Payer, J. Johnson
2007, Condor (109) 1-14
The coastal plain of the Arctic National Wildlife Refuge hosts seven species of migratory shorebirds listed as highly imperiled or high priority by the U.S. Shorebird Conservation Plan and five species listed as Birds of Conservation Concern by the U.S. Fish and Wildlife Service. During the first comprehensive shorebird survey...
Persistence of pharmaceuticals and other organic compounds in chlorinated drinking water as a function of time
Jacob Gibs, Paul E. Stackelberg, Edward T. Furlong, Michael T. Meyer, Steven D. Zaugg, R.L. Lippincott
2007, Science of the Total Environment (373) 240-249
Ninety eight pharmaceuticals and other organic compounds (POOCs) that were amended to samples of chlorinated drinking-water were extracted and analyzed 1, 3, 6, 8, and 10 days after amendment to determine whether the total chlorine residual reacted with the amended POOCs in drinking water in a time frame similar to...
Lateral variation in geochemistry, petrology, and palynology in the Elswick coal bed, Pike County, Kentucky
J.C. Hower, L.F. Ruppert, C.F. Eble
2007, International Journal of Coal Geology (69) 165-178
The Middle Pennsylvanian/Langsettian (Westphalian A) Elswick coal bed, correlative to the Upper Banner of Virginia, is a rare example of a mined high-sulfur (> 2%) coal in Eastern Kentucky, a region known for low-sulfur coals. To characterize lateral variation in the geochemistry, petrography, and palynology of the Elswick coal bed,...
Resource availability, matrix quality, microclimate, and spatial pattern as predictors of patch use by the Karner blue butterfly
R. Grundel, N.B. Pavlovic
2007, Biological Conservation (135) 135-144
Determination of which aspects of habitat quality and habitat spatial arrangement best account for variation in a species’ distribution can guide management for organisms such as the Karner blue butterfly (Lycaeides melissa samuelis), a federally endangered subspecies inhabiting savannas of Midwest and Eastern United States. We examined the extent to...
Longterm trends in nest counts of colonial seabirds in South Carolina, USA
P.G.R. Jodice, T.M. Murphy, F.J. Sanders, L.M. Ferguson
2007, Waterbirds (30) 40-51
We analyzed temporal and spatial trends in annual nest counts of Brown Pelicans (Pelecanus occidentalis), Royal Terns (Sterna maxima), and Sandwich Terns (Sterna sandvicensis) throughout South Carolina from 1969 through 2005. There was an increase in the number of active pelican nests from 1969 through the mid 1980s, although this...
Dominance of organic nitrogen from headwater streams to large rivers across the conterminous United States
D. Scott, J. Harvey, R. Alexander, G. Schwarz
2007, Global Biogeochemical Cycles (21)
The frequency and magnitude of hypoxic areas in coastal waterbodies are increasing across the globe, partially in response to the increase in nitrogen delivery from the landscape (Diaz, 2001; Rabalais et al., 2002). Although studies of annual total nitrogen and nitrate yields have greatly improved understanding of the contaminant sources...
Occurrence of the amphibian pathogen Batrachochytrium dendrobatidis in the Pacific Northwest
C.A. Pearl, E. L. Bull, D. E. Green, J. Bowerman, M.J. Adams, A. Hyatt, W.H. Wente
2007, Journal of Herpetology (41) 145-149
Chytridiomycosis (infection by the fungus Batrachochytrium dendrobatidis) has been associated with amphibian declines in at least four continents. We report results of disease screens from 210 pond-breeding amphibians from 37 field sites in Oregon and Washington. We detected B. dendrobatidis on 28% of sampled amphibians, and we found ??? 1...
Forensic fingerprinting of oil-spill hydrocarbons in a methanogenic environment-Mandan, ND and Bemidji, MN
Frances D. Hostettler, Y. Wang, Y. Huang, W. Cao, Barbara A. Bekins, Colleen E. Rostad, C. F. Kulpa, Andrew E. Laursen
2007, Environmental Forensics (8) 139-153
In recent decades forensic fingerprinting of oil-spill hydrocarbons has emerged as an important tool for correlating oils and for evaluating their source and character. Two long-term hydrocarbon spills, an off-road diesel spill (Mandan, ND) and a crude oil spill (Bemidji, MN) experiencing methanogenic biodegradation were previously shown to be undergoing...
The effect of Appalachian mountaintop mining on interior forest
James D. Wickham, K.H. Riitters, T.G. Wade, Michael Coan, Collin G. Homer
2007, Landscape Ecology (22) 179-187
Southern Appalachian forests are predominantly interior because they are spatially extensive with little disturbance imposed by other uses of the land. Appalachian mountaintop mining increased substantially during the 1990s, posing a threat to the interior character of the forest. We used spatial convolution to identify interior forest at multiple scales...
Littoral fish assemblages of the alien-dominated Sacramento-San Joaquin Delta, California, 1980-1983 and 2001-2003
L. R. Brown, D. Michniuk
2007, Estuaries and Coasts (30) 186-200
We analyzed monthly boat electrofishing data to characterize the littoral fish assemblages of five regions of the Sacramento-San Joaquin Delta (northern, southern, eastern, western, and central), California, during two sampling periods, 1980-1983 (1980s) and 2001-2003 (2000s), to provide information pertinent to the restoration of fish populations in this highly altered...
Colored dissolved organic matter in Tampa Bay, Florida
Z. Chen, C. Hu, R.N. Conmy, F. Muller-Karger, P. Swarzenski
2007, Marine Chemistry (104) 98-109
Absorption and fluorescence of colored dissolved organic matter (CDOM) and concentrations of dissolved organic carbon (DOC), chlorophyll and total suspended solids in Tampa Bay and its adjacent rivers were examined in June and October of 2004. Except in Old Tampa Bay (OTB), the spatial distribution of CDOM showed a conservative...
Best management practices for nutrient and sediment retention in urban stormwater runoff
D.M. Hogan, M.R. Walbridge
2007, Journal of Environmental Quality (36) 386-395
Stormwater management infrastructure is utilized in urban areas to alleviate flooding caused by decreased landscape permeability from increased impervious surface cover (ISC) construction. In this study, we examined two types of stormwater detention basins, SDB-BMPs (stormwater detention basin-best management practice), and SDB-FCs (stormwater detention basin-flood control). Both are constructed to...
Nutrient export from watersheds on Mt. Desert Island, maine, as a function of land use and fire history
M.G. Nielsen, J. S. Kahl
2007, Environmental Monitoring and Assessment (126) 81-96
A study of 13 small (less than 7.5 km2) watersheds on Mt. Desert Island, Maine, was conducted from January 1999 to September 2000 to determine nutrient export delivery to coastal waters around the island, and to determine whether a series of wildfires in 1947 have affected nutrient export in burned...
Plumbing the global carbon cycle: Integrating inland waters into the terrestrial carbon budget
J. J. Cole, Y.T. Prairie, N.F. Caraco, W. H. McDowell, L.J. Tranvik, Robert G. Striegl, C.M. Duarte, Pirkko Kortelainen, J. A. Downing, J. J. Middelburg, J. Melack
2007, Ecosystems (10) 171-184
Because freshwater covers such a small fraction of the Earth's surface area, inland freshwater ecosystems (particularly lakes, rivers, and reservoirs) have rarely been considered as potentially important quantitative components of the carbon cycle at either global or regional scales. By taking published estimates of gas exchange, sediment accumulation, and carbon...
