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Page 1867, results 46651 - 46675

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Not all publications have extents, not all extents are completely accurate
Molecular investigations into a globally important carbon pool: Permafrost-protected carbon in Alaskan soils
M. P. Waldrop, K.P. Wickland, Rickie White, A.A. Berhe, J.W. Harden, V.E. Romanovsky
2010, Global Change Biology (16) 2543-2554
The fate of carbon (C) contained within permafrost in boreal forest environments is an important consideration for the current and future carbon cycle as soils warm in northern latitudes. Currently, little is known about the microbiology or chemistry of permafrost soils that may affect its decomposition once soils thaw. We...
Whole-rock Pb and Sm-Nd isotopic constraints on the growth of southeastern Laurentia during Grenvillian orogenesis
C. M. Fisher, S. L. Loewy, C. F. Miller, P. Berquist, W. R. Van Schmus, R. D. Hatcher Jr., J. L. Wooden, P. D. Fullagar
2010, Geological Society of America Bulletin (122) 1646-1659
The conventional view that the basement of the southern and central Appalachians represents juvenile Mesoproterozoic crust, the final stage of growth of Laurentia prior to Grenville collision, has recently been challenged. New whole-rock Pb and Sm‑Nd isotopic data are presented from Mesoproterozoic basement in the southern and central Appalachians and...
Sap flux-scaled transpiration by tamarisk (Tamarix spp.) before, during and after episodic defoliation by the saltcedar leaf beetle (Diorhabda carinulata)
K. R. Hultine, P.L. Nagler, K. Morino, S.E. Bush, K.G. Burtch, P.E. Dennison, E. P. Glenn, J.R. Ehleringer
2010, Agricultural and Forest Meteorology (150) 1467-1475
The release of the saltcedar beetle (Diorhabda carinulata) has resulted in the periodic defoliation of tamarisk (Tamarix spp.) along more than 1000 river km in the upper Colorado River Basin and is expected to spread along many other river reaches throughout the upper basin, and possibly into the lower Colorado...
Assemblage patterns of fish functional groups relative to habitat connectivity and conditions in floodplain lakes
S. Miyazono, J.N. Aycock, L.E. Miranda, T.E. Tietjen
2010, Ecology of Freshwater Fish (19) 578-585
We evaluated the influences of habitat connectivity and local environmental factors on the distribution and abundance patterns of fish functional groups in 17 floodplain lakes in the Yazoo River Basin, USA. The results of univariate and multivariate analyses showed that species-environmental relationships varied with the functional groups. Species richness and...
How vegetation and sediment transport feedbacks drive landscape change in the Everglades and wetlands worldwide
Laurel G. Larsen, Judson W. Harvey
2010, American Naturalist (176) E66-E79
Mechanisms reported to promote landscape self‐organization cannot explain vegetation patterning oriented parallel to flow. Recent catastrophic shifts in Everglades landscape pattern and ecological function highlight the need to understand the feedbacks governing these ecosystems. We modeled feedback between vegetation, hydrology, and sediment transport on the basis of a decade of...
Effectiveness of a redesigned water diversion using rock vortex weirs to enhance longitudinal connectivity for small Salmonids
Kyle D. Martens, Patrick J. Connolly
2010, North American Journal of Fisheries Management 1544-1552
For nearly 100 years, water diversions have affected fish passage in Beaver Creek, a tributary of the lower Methow River in north-central Washington State. From 2000 to 2004, four dam-style water diversions were replaced with a series of rock vortex weirs (RVWs). The weirs were designed to allow fish passage...
Wild Steelhead and introduced spring Chinook Salmon in the Wind River, Washington: Overlapping populations and interactions
I.G. Jezorek, P.J. Connolly
2010, Report
We investigated interactions of introduced juvenile spring Chinook salmon Oncorhynchus tshawytscha with wild juvenile steelhead O. mykiss in the upper Wind River watershed (rkm 24.6 to rkm 43.8), Washington. Our objective was to determine if the presence of introduced spring Chinook salmon influenced populations of wild juvenile steelhead and if...
Gypsies in the palace: Experimentalist's view on the use of 3-D physics-based simulation of hillslope hydrological response
A.L. James, Jeffery J. McDonnell, I. Tromp-Van Meerveld, N.E. Peters
2010, Hydrological Processes (24) 3878-3893
As a fundamental unit of the landscape, hillslopes are studied for their retention and release of water and nutrients across a wide range of ecosystems. The understanding of these near-surface processes is relevant to issues of runoff generation, groundwater-surface water interactions, catchment export of nutrients, dissolved organic carbon, contaminants (e.g....
Wind River water restoration, Annual report November 2008 to October 2009.
P.J. Connolly, I.G. Jezorek, C.S. Munz
2010, Report
This report summarizes work completed by U.S. Geological Survey’s Columbia River Research Laboratory (USGS-CRRL) in the Wind River subbasin during the period November 2008 through October 2009 under Bonneville Power Administration (BPA) contract 41038. Long term research in the Wind River has focused on assessments of steelhead/rainbow trout Oncorhynchus...
Comparison of XAD with other dissolved lignin isolation techniques and a compilation of analytical improvements for the analysis of lignin in aquatic settings
Robert G. M. Spencer, George R. Aiken, Rachael Y. Dyda, Kenna D. Butler, Brian A. Bergamaschi, Peter J. Hernes
2010, Organic Geochemistry (41) 445-453
This manuscript highlights numerous incremental improvements in dissolved lignin measurements over the nearly three decades since CuO oxidation of lignin phenols was first adapted for environmental samples. Intercomparison of the recovery efficiency of three common lignin phenol concentration and isolation techniques, namely XAD, C18with both CH3OH (C18M) and CH3CN (C18A)...
Rice production systems and avian influenza: Interactions between mixed-farming systems, poultry and wild birds
S.B. Muzaffar, John Y. Takekawa, D.J. Prosser, S. H. Newman, X. Xiao
2010, Waterbirds (33) 219-230
Wild waterfowl are the reservoir for avian influenza viruses (AIVs), a family of RNA viruses that may cause mild sickness in waterbirds. Emergence of H5N1, a highly pathogenic avian influenza (HPAI) strain, causing severe disease and mortality in wild birds, poultry and humans, had raised concerns about the role of...
Ecoregions and stream morphology in eastern Oklahoma
D. K. Splinter, D.C. Dauwalter, R. A. Marston, W.L. Fisher
2010, Geomorphology (122) 117-128
Broad-scale variables (i.e., geology, topography, climate, land use, vegetation, and soils) influence channel morphology. How and to what extent the longitudinal pattern of channel morphology is influenced by broad-scale variables is important to fluvial geomorphologists and stream ecologists. In the last couple of decades, there has been an increase in...
Passive seismic monitoring of natural and induced earthquakes: Case studies, future directions and socio-economic relevance
Marco Bohnhoff, Georg Dresen, William L. Ellsworth, Hisao Ito
Sierd Cloetingh, Jorg Negendank, editor(s)
2010, Book chapter, New frontiers in integrated solid earth sciences
An important discovery in crustal mechanics has been that the Earth’s crust is commonly stressed close to failure, even in tectonically quiet areas. As a result, small natural or man-made perturbations to the local stress field may trigger earthquakes. To understand these processes, Passive Seismic Monitoring (PSM) with seismometer arrays...
Tree mortality following prescribed fire and a storm surge event in Slash Pine (pinus elliottii var. densa) forests in the Florida Keys, USA
Jay P. Sah, Michael S. Ross, James R. Snyder, Danielle E. Ogurcak
2010, International Journal of Forestry Research (10)
In fire-dependent forests, managers are interested in predicting the consequences of prescribed burning on postfire tree mortality. We examined the effects of prescribed fire on tree mortality in Florida Keys pine forests, using a factorial design with understory type, season, and year of burn as factors. We also used logistic...
Debris flows resulting from glacial-lake outburst floods in tibet, China
P. Cui, C. Dang, Z. Cheng, K. Scott
2010, Physical Geography (31) 508-527
During the last 70 years of general climatic amelioration, 18 glacial-lake outburst floods (GLOFs) and related debris flows have occurred from 15 moraine-dammed lakes in Tibet, China. Catastrophic loss of life and property has occurred because of the following factors: the large volumes of water discharged, the steep gradients of...
The tidally averaged momentum balance in a partially and periodically stratified estuary
M.T. Stacey, Matthew L. Brennan, Jon R. Burau, Stephen G. Monismith
2010, Journal of Physical Oceanography (40) 2418-2434
Observations of turbulent stresses and mean velocities over an entire spring–neap cycle are used to evaluate the dynamics of tidally averaged flows in a partially stratified estuarine channel. In a depth-averaged sense, the net flow in this channel is up estuary due to interaction of tidal forcing with the geometry...
Effect of imperfect detectability on adaptive and conventional sampling: Simulated sampling of freshwater mussels in the upper Mississippi River
D. R. Smith, B. R. Gray, T.J. Newton, D. Nichols
2010, Environmental Monitoring and Assessment (170) 499-507
Adaptive sampling designs are recommended where, as is typical with freshwater mussels, the outcome of interest is rare and clustered. However, the performance of adaptive designs has not been investigated when outcomes are not only rare and clustered but also imperfectly detected. We address this combination of challenges using data...