Evaluation of the status of anurans on a refuge in suburban Maryland
S.M. Brander, J. Andrew Royle, M. Eames
2007, Journal of Herpetology (41) 52-60
Because many anurans have well-defined breeding seasons and male anurans produce loud advertisement calls, surveys of these breeding choruses are believed to provide a dependable means of monitoring population trends. The Patuxent Research Refuge initiated such a calling survey in the spring of 1997, which uses volunteers to collect anuran...
Ecological linkages between headwaters and downstream ecosystems: Transport of organic matter, invertebrates, and wood down headwater channels
M.S. Wipfli, J.S. Richardson, R.J. Naiman
2007, Journal of the American Water Resources Association (43) 72-85
Headwater streams make up a large proportion of the total length and watershed area of fluvial networks, and are partially characterized by the large volume of organic matter (large wood, detritus, and dissolved organic matter) and invertebrate inputs from the riparian forest, relative to stream size. Much of those inputs...
Trace analysis of trimethoprim and sulfonamide, macrolide, quinolone, and tetracycline antibiotics in chlorinated drinking water using liquid chromatography electrospray tandem mass spectrometry
Z. Ye, H.S. Weinberg, M. T. Meyer
2007, Analytical Chemistry (79) 1135-1144
A multirun analytical method has been developed and validated for trace determination of 24 antibiotics including 7 sulfonamides, 3 macrolides, 7 quinolones, 6 tetracyclines, and trimethoprim in chlorine-disinfected drinking water using a single solid-phase extraction method coupled to liquid chromatography with positive electrospray tandem mass spectrometry detection. The analytes were...
Paleoecology of the Late Pennsylvanian-age Calhoun coal bed and implications for long-term dynamics of wetland ecosystems
Debra A. Willard, T.L. Phillips, Alicia D. Lesnikowska, William A. DiMichele
2007, International Journal of Coal Geology (69) 21-54
Quantitative plant assemblage data from coal balls, miospores, megaspores, and compression floras from the Calhoun coal bed (Missourian) of the Illinois Basin (USA) are used to interpret spatial and temporal changes in plant communities in the paleo-peat swamp. Coal-ball and miospore floras from the Calhoun coal bed are dominated strongly...
DIN retention-transport through four hydrologically connected zones in a headwater catchment of the Upper Mississippi River
F.J. Triska, J.H. Duff, R.W. Sheibley, A. P. Jackman, R.J. Avanzino
2007, Journal of the American Water Resources Association (43) 60-71
Dissolved inorganic nitrogen (DIN) retention-transport through a headwater catchment was synthesized from studies encompassing four distinct hydrologic zones of the Shingobee River Headwaters near the origin of the Mississippi River. The hydrologic zones included: (1) hillslope ground water (ridge to bankside riparian); (2) alluvial...
Migration and the use of Autumn, Winter, and Spring roosts by tree bats
Paul M. Cryan, J. P. Veilleux
2007, Book chapter, Bats in forests: Conservation and management
No abstract available....
Late quaternary temperature record from buried soils of the North American Great Plains
L. Nordt, J. Von Fischer, L. Tieszen
2007, Geology (35) 159-162
We present the first comprehensive late Quaternary record of North American Great Plains temperature by assessing the behavior of the stable isotopic composition (δ13C) of buried soils. After examining the relationship between the δ13C of topsoil organic matter and July temperature from 61 native prairies within a latitudinal range of...
Spatial data infrastructures in management of natural disasters
K.O. Asante, J. P. Verdin, M.P. Crane, S.A. Tokar, James D. Rowland
H. Onsrud, editor(s)
2007, Book chapter, Research and theory in advancing spatial data infrastructure concepts
No abstract available....
Relationships of cadmium, mercury, and selenium with nutrient reserves of female lesser scaup (Aythya affinis) during winter and spring migration
M.J. Anteau, A. D. Afton, Christine M. Custer, T. W. Custer
2007, Environmental Toxicology and Chemistry (26) 515-520
Trace elements may have important effects on body condition of ducks during spring migration, because individuals are experiencing energetically costly events (e.g., migration, nutrient reserve accumulation, pair formation, feather molt, and ovarian follicle development). We examined relationships among hepatic cadmium, mercury, and selenium concentrations (microg/g dry wt) and nutrient reserves...
Platinum group elements and gold in ferromanganese crusts from Afanasiy-Nikitin seamount, equatorial Indian Ocean: Sources and fractionation
V.K. Banakar, J.R. Hein, R.P. Rajani, A.R. Chodankar
2007, Journal of Earth System Science (116) 3-13
The major element relationships in ferromanganese (Fe-Mn) crusts from Afanasiy-Nikitin seamount (ANS), eastern equatorial Indian Ocean, appear to be atypical. High positive correlations (r = 0.99) between Mn/Co and Fe/Co ratios, and lack of correlation of those ratios with Co, Ce, and Ce/Co, indicate that the ANS...
A path-independent integral for the characterization of solute concentration and flux at biofilm detachments
B. Moran, S.S. Kulkarni, H. W. Reeves
2007, International Journal of Fracture (143) 291-300
A path-independent (conservation) integral is developed for the characterization of solute concentration and flux in a biofilm in the vicinity of a detachment or other flux limiting boundary condition. Steady state conditions of solute diffusion are considered and biofilm kinetics are described by an uptake term which can be expressed...
Historical trends in creel limits, length-based limits, and season restrictions for black basses in the United States and Canada
C. Paukert, M. McInerny, Ronald Schultz
2007, Fisheries (32) 62-72
We determined for largemouth bass (Micropterus salmoides), smallmouth bass (M. dolomeui), and spotted bass (M. punctulatus) historical trends in state- and province-wide creel limits, length limits, and season closures along with the rationale justifying these regulations. Based on data gathered via mail surveys and the Internet, 55 jurisdictions had state-...
The viability of a nonenzymatic reductive citric acid cycle - Kinetics and thermochemistry
D.S. Ross
2007, Origins of Life and Evolution of the Biosphere (37) 61-65
The likelihood of a functioning nonenzymatic reductive citric acid cycle, recently proposed as the precursor to biosynthesis on early Earth, is examined on the basis of the kinetics and thermochemistry of the acetate → pyruvate → oxaloacetate → malate sequence. Using data derived from studies of...
Lateral spread hazard mapping of the northern Salt Lake Valley, Utah, for a M7.0 scenario earthquake
M.J. Olsen, S.F. Bartlett, B.J. Solomon
2007, Earthquake Spectra (23) 95-113
This paper describes the methodology used to develop a lateral spread-displacement hazard map for northern Salt Lake Valley, Utah, using a scenario M7.0 earthquake occurring on the Salt Lake City segment of the Wasatch fault. The mapping effort is supported by a substantial amount of geotechnical, geologic, and topographic data...
Fall migration and habitat use of American woodcock in the central United States
N.A. Myatt, D.G. Krementz
2007, Journal of Wildlife Management (71) 1197-1205
Little is known about the migration ecology of the American woodcock (Scolopax minor). From 2001 to 2003, we began a 3-year study to document woodcock fall migration routes, rates, and habitat use from Minnesota, Wisconsin, and Michigan, USA. Some 586 radiomarked woodcock initiated migration. During 224 hours of aerial telemetry,...
Estimating fishing mortality, natural mortality, and selectivity using recoveries from tagging young fish
H. Jiang, C. Brownie, J.E. Hightower, K. H. Pollock
2007, North American Journal of Fisheries Management (27) 773-781
Current methods for estimation of age- and year-specific instantaneous mortality rates based on multiyear, multiple-age tagging studies assume that it is feasible to tag fish in a wide range of ages. For some species, however, only the youngest one or two age-classes are readily available for tagging. Given the practical...
Spawning migration movements of Klamath largescale, Lost River, and shortnose suckers in the Williamson and Sprague rivers, Oregon, prior to the removal of Chiloquin Dam. Annual report 2006
C.M. Ellsworth, C.D. Luton, T.J. Tyler, S. P. VanderKooi, R.S. Shively
2007, Report
No abstract available ...
The application of satellite differential SAR interferometry-derived ground displacements in hydrogeology
D. L. Galloway, J. Hoffmann
2007, Hydrogeology Journal (15) 133-154
The application of satellite differential synthetic aperture radar (SAR) interferometry, principally coherent (InSAR) and to a lesser extent, persistent-scatterer (PSI) techniques to hydrogeologic studies has improved capabilities to map, monitor, analyze, and simulate groundwater flow, aquifer-system compaction and land subsidence. A number of investigations over the previous decade show how...
Solar forcing of Gulf of California climate during the past 2000 yr suggested by diatoms and silicoflagellates
John A. Barron, David Bukry
2007, Marine Micropaleontology (62) 115-139
High-resolution records of the past 2000 yr are compared in a north–south transect (28° N to 24° N) of three cores from the eastern slopes of the Guaymas, Carmen, and Pescadero Basins of the Gulf of California (hereafter referred to as the “Gulf”). Evenly-spaced samples from the varved sediments in each...
North to Alaska: Evidence for conveyor belt transport of Dungeness crab larvae along the west coast of the United States and Canada
W. Park, David C. Douglas, Thomas C. Shirley
2007, Limnology and Oceanography (52) 248-256
We propose and evaluate the hypothesis that Dungeness crab (Cancer magister) larvae from the northwestern coast of the United States and Canada can be transported northward to southeastern Alaska. Larvae collected in southeastern Alaska during May and June 1997–2004 had abundances and stages that varied seasonally, interannually, and spatially. An...
SHRIMP U-Pb evidence for a Late Silurian age of metasedimentary rocks in the Merrimack and Putnam-Nashoba terranes, eastern New England
R. P. Wintsch, J. N. Aleinikoff, G. J. Walsh, Wallace A. Bothner, A. M. Hussey, C.M. Fanning
2007, American Journal of Science (307) 119-167
U-Pb ages of detrital, metamorphic, and magmatic zircon and metamorphic monazite and titanite provide evidence for the ages of deposition and metamorphism of metasedimentary rocks from the Merrimack and Putnam-Nashoba terranes of eastern New England. Rocks from these terranes are interpreted here as having been deposited in the middle Paleozoic...
Global impacts of conversions from natural to agricultural ecosystems on water resources: Quantity versus quality
Bridget R. Scanlon, Ian Jolly, Marios Sophocleous, Lu Zhang
2007, Water Resources Research (43)
Past land use changes have greatly impacted global water resources, with often opposing effects on water quantity and quality. Increases in rain‐fed cropland (460%) and pastureland (560%) during the past 300 years from forest and grasslands decreased evapotranspiration and increased recharge (two orders of magnitude) and streamflow (one order of...
Sand deposition in shoreline eddies along five Wild and Scenic Rivers, Idaho
E.D. Andrews, K.R. Vincent
2007, River Research and Applications (23) 7-20
Sand bars deposited along the lateral margin of a river channel are frequently a focus of recreational activities. Sand bars are appealing sites on which to camp, picnic, fish and relax because they are relatively flat, soft, non-cohesive sand, free of vegetation and near the water's edge. The lack of...
The energy radiated by the 26 December 2004 Sumatra-Andaman earthquake estimated from 10-minute P-wave windows
G. L. Choy, J. Boatwright
2007, Bulletin of the Seismological Society of America (97)
The rupture process of the Mw 9.1 Sumatra-Andaman earthquake lasted for approximately 500 sec, nearly twice as long as the teleseismic time windows between the P and PP arrival times generally used to compute radiated energy. In order to measure the P waves radiated by the entire earthquake, we analyze...
Home range characteristics of Mexican Spotted Owls in the canyonlands of Utah
D.W. Willey, Charles van Riper III
2007, Journal of Raptor Research (41) 10-15
We studied home-range characteristics of adult Mexican Spotted Owls (Strix occidentalis lucida) in southern Utah. Twenty-eight adult owls were radio-tracked using a ground-based telemetry system during 1991-95. Five males and eight females molted tail feathers and dropped transmitters within 4 wk. We estimated cumulative home ranges for 15 Spotted Owls...
