Seasonal habitat use and selection by grizzly bears in Northern British Columbia
B. Milakovic, K.L. Parker, D.D. Gustine, R.J. Lay, A.B.D. Walker, M.P. Gillingham
2012, Journal of Wildlife Management (76) 170-180
We defined patterns of habitat use and selection by female grizzly bears (Ursus arctos) in the Besa-Prophet watershed of northern British Columbia. We fitted 13 adult females with Geographic Positioning System (GPS) radio-collars and monitored them between 2001 and 2004. We examined patterns of habitat selection by grizzly bears relative...
Tidally driven export of dissolved organic carbon, total mercury, and methylmercury from a mangrove-dominated estuary
Brian A. Bergamaschi, D. P. Krabbenhoft, George Aiken, Eduardo Patino, D.G. Rumbold, William H. Orem
2012, Environmental Science & Technology (46) 1371-1378
The flux of dissolved organic carbon (DOC) from mangrove swamps accounts for 10% of the global terrestrial flux of DOC to coastal oceans. Recent findings of high concentrations of mercury (Hg) and methylmercury (MeHg) in mangroves, in conjunction with the common co-occurrence of DOC and Hg species, have raised concerns...
Native rainbow smelt and nonnative alewife distribution related to temperature and light gradients in Lake Champlain
Donna L. Parrish, Paul W. Simonin, Lars G. Rudstam, Patrick J. Sullivan, Bernard Pientka
2012, Journal of Great Lakes Research (38) 115-122
Alewife (Alosa pseudoharengus) recently became established in Lake Champlain and may compete with native rainbow smelt (Osmerus mordax) for food or consume larval rainbow smelt. The strength of this effect depends partly on the spatial and temporal overlap of different age groups of the two species; therefore, we need a...
Hierarchy in factors affecting fish biodiversity in floodplain lakes of the Mississippi Alluvial Valley
D.J. Dembkowski, L.E. Miranda
2012, Environmental Biology of Fishes (93) 357-368
River-floodplain ecosystems offer some of the most diverse and dynamic environments in the world. Accordingly, floodplain habitats harbor diverse fish assemblages. Fish biodiversity in floodplain lakes may be influenced by multiple variables operating on disparate scales, and these variables may exhibit a hierarchical organization depending on whether one variable governs...
Determination of sediment provenance by unmixing the mineralogy of source-area sediments: The "SedUnMix" program
John T. Andrews, D. D. Eberl
2012, Marine Geology (291-294) 24-33
Along the margins of areas such as Greenland and Baffin Bay, sediment composition reflects a complex mixture of sources associated with the transport of sediment in sea ice, icebergs, melt-water and turbidite plumes. Similar situations arise in many contexts associated with sediment transport and with the mixing of sediments from...
Identifying fluorescent pulp mill effluent in the Gulf of Maine and its watershed
Kaelin M. Cawley, Kenna D. Butler, George R. Aiken, Laurel G. Larsen, Thomas G. Huntington, Diane M. McKnight
2012, Marine Pollution Bulletin (64) 1678-1687
Using fluorescence spectroscopy and parallel factor analysis (PARAFAC) we characterized and modeled the fluorescence properties of dissolved organic matter (DOM) in samples from the Penobscot River, Androscoggin River, Penobscot Bay, and the Gulf of Maine (GoM). We analyzed excitation-emission matrices (EEMs) using an existing PARAFAC model (Cory and McKnight, 2005)...
Recent paleorecords document rising mercury contamination in Lake Tanganyika
Christopher H. Conaway, Peter W. Swarzenski, A.S. Cohen
2012, Applied Geochemistry (27) 352-359
Recent Lake Tanganyika Hg deposition records were derived using 14C and excess 210Pb geochronometers in sediment cores collected from two contrasting depositional environments: the Kalya Platform, located mid-lake and more removed from watershed impacts, and the Nyasanga/Kahama River delta region, located close to the lake’s shoreline north of Kigoma. At the Kalya...
Initiation of long-term coupled microbiological, geochemical, and hydrological experimentation within the seafloor at North Pond, western flank of the Mid-Atlantic Ridge
K.J. Edwards, N. Backert, W. Bach, K. Becker, A. Klaus, Dale W. Griffin, L. Anderson, A.G. Haddad, Y. Harigane, P.L. Campion, H. Hirayama, H.J. Mills, S.M. Hulme, K. Nakamura, S.L. Jorgensen, B. Orcutt, T.L. Insua, Y.-S. Park, V. Rennie, E.C. Salas, O. Rouxel, F. Wang, J.A. Russel, C.G. Wheat, K. Sakata, M. Brown, J.L. Magnusson, Z. Ettlinger
2012, Integrated Ocean Drilling Program: Preliminary Reports 1-72
Integrated Ocean Drilling Program (IODP) Expedition 336 successfully initiated subseafloor observatory science at a young mid-ocean-ridge flank setting. All of the drilled sites are located in the North Pond region of the Atlantic Ocean (22°45′N, 46°05′W) in 4414–4483 m water depth. This area is known from previous ocean drilling and...
Using multitemporal remote sensing imagery and inundation measures to improve land change estimates in coastal wetlands
Y.C. Allen, B.R. Couvillion, J.A. Barras
2012, Estuaries and Coasts (35) 190-200
Remote sensing imagery can be an invaluable resource to quantify land change in coastal wetlands. Obtaining an accurate measure of land change can, however, be complicated by differences in fluvial and tidal inundation experienced when the imagery is captured. This study classified Landsat imagery from two wetland areas in coastal...
Modifications to the conduit flow process mode 2 for MODFLOW-2005
Thomas Reimann, S. Birk, C. Rehrl, W. Barclay Shoemaker
2012, Ground Water (50) 144-148
As a result of rock dissolution processes, karst aquifers exhibit highly conductive features such as caves and conduits. Within these structures, groundwater flow can become turbulent and therefore be described by nonlinear gradient functions. Some numerical groundwater flow models explicitly account for pipe hydraulics by coupling the continuum model with...
Copper(II) binding by dissolved organic matter: Importance of the copper-to-dissolved organic matter ratio and implications for the Biotic Ligand Model
Alison M. Craven, George R. Aiken, Joseph N. Ryan
2012, Environmental Science & Technology (46) 9948-9955
The ratio of copper to dissolved organic matter (DOM) is known to affect the strength of copper binding by DOM, but previous methods to determine the Cu2+–DOM binding strength have generally not measured binding constants over the same Cu:DOM ratios. In this study, we used a competitive ligand exchange–solid-phase extraction...
Pathogenic human viruses are present in residential canals
Dale W. Griffin
2012, Book chapter, Tropical connections: south Florida's marine environment
No abstract available....
Presence of avian influenza viruses in waterfowl and wetlands during summer 2010 in California: Are resident birds a potential reservoir?
V. Henaux, M.D. Samuel, Robert J. Dusek, J. P. Fleskes, Hon S. Ip
2012, PLoS ONE (7)
Although wild waterfowl are the main reservoir for low pathogenic avian influenza viruses (LPAIv), the environment plays a critical role for the circulation and persistence of AIv. LPAIv may persist for extended periods in cold environments, suggesting that waterfowl breeding areas in the northern hemisphere may be an important reservoir...
Hydrological effects of the increased CO2 and climate change in the Upper Mississippi River Basin using a modified SWAT
Y. Wu, S. Liu, O. I. Abdul-Aziz
2012, Climatic Change (110) 977-1003
Increased atmospheric CO2 concentration and climate change may significantly impact the hydrological and meteorological processes of a watershed system. Quantifying and understanding hydrological responses to elevated ambient CO2 and climate change is, therefore, critical for formulating adaptive strategies for an appropriate management of water resources. In this study, the Soil...
Land-cover change detection
Xuexia Chen, Chandra Giri, James Vogelmann
2012, Book chapter, Remote Sensing of Land Use and Land Cover
Land cover is the biophysical material on the surface of the earth. Land-cover types include grass, shrubs, trees, barren, water, and man-made features. Land cover changes continuously. The rate of change can be either dramatic and abrupt, such as the changes caused by logging, hurricanes and fire, or subtle and...
MODFLOW-NWT – Robust handling of dry cells using a Newton Formulation of MODFLOW-2005
Randal J. Hunt, Daniel T. Feinstein
2012, Ground Water (50) 659-663
The first versions of the widely used groundwater flow model MODFLOW (McDonald and Harbaugh 1988) had a sure but inflexible way of handling unconfined finite-difference aquifer cells where the water table dropped below the bottom of the cell—these "dry cells" were turned inactive for the remainder of the simulation. Problems...
Stable water isotopologue ratios in fog and cloud droplets of liquid clouds are not size-dependent
J.K. Spiegel, F. Aemisegger, M. Scholl, F.G. Wienhold, J.L. Collett Jr., T. Lee, D. van Pinxteren, S. Mertes, A. Tilgner, H. Herrmann, Roland A. Werner, N. Buchmann, W. Eugster
2012, Atmospheric Chemistry and Physics (12) 9855-9863
In this work, we present the first observations of stable water isotopologue ratios in cloud droplets of different sizes collected simultaneously. We address the question whether the isotope ratio of droplets in a liquid cloud varies as a function of droplet size. Samples were collected from a ground intercepted cloud...
Cambrian-lower Middle Ordovician passive carbonate margin, southern Appalachians
J. Fred Read, John E. Repetski
2012, Book chapter, The great American carbonate bank: The geology and economic resources of the Cambrian-Ordovician Sauk megasequence of Laurentia
The southern Appalachian part of the Cambrian–Ordovician passive margin succession of the great American carbonate bank extends from the Lower Cambrian to the lower Middle Ordovician, is as much as 3.5 km (2.2 mi) thick, and has long-term subsidence rates exceeding 5 cm (2 in.)/k.y. Subsiding depocenters separated by arches...
Navigational inlets are conduits for land-based sources of pollution
J.C. Flutch, Dale W. Griffin, Erin K. Lipp
2012, Book chapter, Tropical connections: south Florida's marine environment
No abstract available....
Results of the first North American comparison of absolute gravimeters, NACAG-2010
David Schmerge, Olvier Francis, J. Henton, D. Ingles, D. Jones, Jeffrey R. Kennedy, K. Krauterbluth, J. Liard, D. Newell, R. Sands, J. Schiel, J. Silliker, D. van Westrum
2012, Journal of Geodesy (86) 591-596
The first North American Comparison of absolute gravimeters (NACAG-2010) was hosted by the National Oceanic and Atmospheric Administration at its newly renovated Table Mountain Geophysical Observatory (TMGO) north of Boulder, Colorado, in October 2010. NACAG-2010 and the renovation of TMGO are part of NGS’s GRAV-D project (Gravity for the Redefinition...
Modeling of land use and reservoir effects on nonpoint source pollution in a highly agricultural basin
Yiping Wu, Shu-Guang Liu
2012, Journal of Environmental Monitoring (14) 2350-2361
Nonpoint source (NPS) pollution is tightly linked to land use activities that determine the sources and magnitudes of pollutant loadings to stream water. The pollutant loads may also be alleviated within reservoirs because of the physical interception resulting from changed hydrological regimes and other biochemical processes. It is important but...
Klamath Basin Restoration Agreement Off-Project Water Program Evapotranspiration Map for October 2006
Water Resources Division, U.S. Geological Survey
2012, Report
Modeling of soil erosion and sediment transport in the East River Basin in southern China
Yping Wu, Ji Chen
2012, Science of the Total Environment (441) 159-168
Soil erosion is a major global environmental problem that has caused many issues involving land degradation, sedimentation of waterways, ecological degradation, and nonpoint source pollution. Therefore, it is significant to understand the processes of soil erosion and sediment transport along rivers, and this can help identify the erosion prone areas...
Quantifying riverine surface currents from time sequences of thermal infrared imagery
Jack A. Puleo, T.E. McKenna, K. T. Holland, J. Calantoni
2012, Water Resources Research (48)
River surface currents are quantified from thermal and visible band imagery using two methods. One method utilizes time stacks of pixel intensity to estimate the streamwise velocity at multiple locations. The other method uses particle image velocimetry to solve for optimal two-dimensional pixel displacements between successive frames. Field validation was...
The use of multiobjective calibration and regional sensitivity analysis in simulating hyporheic exchange
Ramon C. Naranjo, Richard G. Niswonger, Mark Stone, Clinton Davis, Alan McKay
2012, Water Resources Research (48)
We describe an approach for calibrating a two-dimensional (2-D) flow model of hyporheic exchange using observations of temperature and pressure to estimate hydraulic and thermal properties. A longitudinal 2-D heat and flow model was constructed for a riffle-pool sequence to simulate flow paths and flux rates for variable discharge conditions....
