Changes in homologous and heterologous gap junction contacts during maturation-inducing hormone-dependent meiotic resumption in ovarian follicles of Atlantic croaker
D. Bolamba, R. Patino, G. Yoshizaki, P. Thomas
2003, General and Comparative Endocrinology (131) 291-295
Homologous (granulosa cell-granulosa cell) gap junction (GJ) contacts increase in ovarian follicles of Atlantic croaker (Micropogonias undulatus) during the early (first) stage of maturation, but their profile during the second stage [i.e., during maturation-inducing hormone (MIH)-mediated meiotic resumption] is unknown. The profile of homologous GJ contacts during the second stage...
Seasonal movement of the Slumgullion landslide determined from global positioning system surveys and field instrumentation, July 1998-March 2002
J. A. Coe, W. L. Ellis, J. W. Godt, W. Z. Savage, J. E. Savage, J. A. Michael, J.D. Kibler, P. S. Powers, D. J. Lidke, S. Debray
2003, Engineering Geology (68) 67-101
Measurements of landslide movement made by global positioning system surveys and extensometers over a 3.5-year period show that the Slumgullion landslide in the San Juan Mountains of southwest Colorado moved throughout the monitoring period, but that daily velocities varied on a seasonal basis. Landslide velocities peaked in the early spring...
Environmental water-quality zones for streams: A regional classification scheme
Dale M. Robertson, D. A. Saad
2003, Environmental Management (31) 581-602
Various approaches have been used to classify large geographical areas into smaller regions of similar water quality or extrapolate water-quality data from a few streams to other unmonitored streams. A combination of some of the strengths of existing techniques is used to develop a new approach for these purposes. In...
Characterization and copper binding of humic and nonhumic organic matter isolated from the South Platte River: Evidence for the presence of nitrogenous binding site
J.-P. Croue, M.F. Benedetti, D. Violleau, J.A. Leenheer
2003, Environmental Science & Technology (37) 328-336
Humic substances typically constitute 40−60% of the dissolved organic matter (DOM) in surface waters. However, little information is available regarding the metal binding properties of the nonhumic hydrophilic portion of the DOM. In this study, humic and nonhumic DOM samples were isolated from the South Platte River...
Number and size of last-glacial Missoula floods in the Columbia River valley between the Pasco Basin, Washington, and Portland, Oregon
G. Benito, J. E. O’Connor
2003, Geological Society of America Bulletin (115) 624-638
Field evidence and radiocarbon age dating, combined with hydraulic flow modeling, provide new information on the magnitude, frequency, and chronology of late Pleistocene Missoula floods in the Columbia River valley between the Pasco Basin, Washington, and Portland, Oregon. More than 25 floods had discharges of > 1.0 x 106 m3/s. At...
Mercury methylation in mine wastes collected from abandoned mercury mines in the USA
J. E. Gray, M.E. Hines, H. Biester, B.K. Lasorsa
Boutron C.Ferrari C., editor(s)
2003, Conference Paper, Journal De Physique. IV : JP
Speciation and transformation of Hg was studied in mine wastes collected from abandoned Hg mines at McDermitt, Nevada, and Terlingua, Texas, to evaluate formation of methyl-Hg, which is highly toxic. In these mine wastes, we measured total Hg and methyl-Hg contents, identified various Hg compounds using a pyrolysis technique, and...
Age of the Mono Lake excursion and associated tephra
L. Benson, J. Liddicoat, J. Smoot, A. Sarna-Wojcicki, R. Negrini, S. Lund
2003, Quaternary Science Reviews (22) 135-140
The Mono Lake excursion (MLE) is an important time marker that has been found in lake and marine sediments across much of the Northern Hemisphere. Dating of this event at its type locality, the Mono Basin of California, has yielded controversial results with the most recent effort concluding that the...
Arctic transitions in the Land - Atmosphere System (ATLAS): Background, objectives, results, and future directions
A. D. McGuire, M. Sturm, F. S. Chapin III
2003, Journal of Geophysical Research D: Atmospheres (108)
This paper briefly reviews the background, objectives, and results of the Arctic Transitions in the Land-Atmosphere System (ATLAS) Project to date and provides thoughts on future directions. The key goal of the ATLAS Project is to improve understanding of controls over spatial and temporal variability of terrestrial processes in the...
Strong ground-motion prediction from Stochastic-dynamic source models
Mariagiovanna Guatteri, P.M. Mai, G. C. Beroza, J. Boatwright
2003, Bulletin of the Seismological Society of America (93) 301-313
In the absence of sufficient data in the very near source, predictions of the intensity and variability of ground motions from future large earthquakes depend strongly on our ability to develop realistic models of the earthquake source. In this article we simulate near-fault strong ground motion using dynamic source models....
Relation of age-0 largemouth bass abundance to hydrilla coverage and water level at Lochloosa and Orange Lakes, Florida
W.B. Tate, M. S. Allen, R.A. Myers, E.J. Nagid, J.R. Estes
2003, North American Journal of Fisheries Management (23) 251-257
Changes in electrofishing catch per hour (CPH) of age-0 largemouth bass Micropterus salmoides were examined in relation to aquatic macrophytes and seasonal water elevation at Lochloosa and Orange lakes, Florida, during the 1990s. At Lochloosa Lake, stepwise multiple regression revealed a significant positive relationship between the mean CPH of age-0...
Paleomagnetism and geochronology of an Early Proterozoic quartz diorite in the southern Wind River Range, Wyoming, USA
S. S. Harlan, J.W. Geisman, W. R. Premo
2003, Tectonophysics (362) 105-122
We present geochronologic and paleomagnetic data from a north-trending quartz diorite intrusion that cuts Archean metasedimentary and metaigneous rocks of the South Pass Greenstone Belt of the Wyoming craton. The quartz diorite was previously thought to be either Archean or Early Proterozoic (?) in age and is cut by north...
Structure, production and resource use in some old-growth spruce/fir forests in the front range of the Rocky Mountains, USA
Dan Binkley, U. Olsson, R. Rochelle, T. Stohlgren, N. Nikolov
2003, Forest Ecology and Management (172) 271-279
Old-growth forests of Engelmann spruce (Picea engelmannii Parry ex. Engelm.) and subalpine fir (Abies lasiocarpa (Hook.) Nutt.) dominate much of the landscape of the Rocky Mountains. We characterized the structure, biomass and production of 18 old-growth (200-450-year-old) spruce/fir forests in Rocky Mountain National Park, Colorado, as well as the stand-level...
Morphological variation in glochidia shells of six species of Elliptio from Gulf of Mexico and Atlantic Coast drainages in the southeastern United States
C. A. O’Brien, J.D. Williams, M.A. Hoggarth
2003, Proceedings of the Biological Society of Washington (116) 719-731
The genus Elliptio, with 36 currently recognized species, is the largest genus in the family Unionidae in North America. The genus is represented by two species, Elliptio crassidens and E. dilatata, in the Interior Basin and 34 species in drainages of the eastern Gulf of Mexico and Atlantic Coast. The...
Photodegradation of roxarsone in poultry litter leachates
A.J. Bednar, J.R. Garbarino, I. Ferrer, D.W. Rutherford, R.L. Wershaw, J. F. Ranville, T.R. Wildeman
2003, Science of the Total Environment (302) 237-245
Arsenic compounds have been used extensively in agriculture in the US for applications ranging from cotton herbicides to animal feed supplements. Roxarsone (3-nitro-4-hydroxyphenylarsonic acid), in particular, is used widely in poultry production to control coccidial intestinal parasites. It is excreted unchanged in the manure and introduced into the environment when...
Anthropogenically induced changes in sediment and biogenic silica fluxes in Chesapeake Bay
Steven M. Colman, J.F. Bratton
2003, Geology (31) 71-74
Sediment cores as long as 20 m, dated by 14C, 210Pb, and 137Cs methods and pollen stratigraphy, provide a history of diatom productivity and sediment-accumulation rates in Chesapeake Bay. We calculated the flux of biogenic silica and total sediment for the past 1500 yr for two high-sedimentation-rate sites in the...
Fault systems of the 1971 San Fernando and 1994 Northridge earthquakes, southern California: Relocated aftershocks and seismic images from LARSE II
G. S. Fuis, R.W. Clayton, P.M. Davis, T. Ryberg, W. J. Lutter, D. A. Okaya, E. Hauksson, C. Prodehl, J.M. Murphy, M.L. Benthien, S.A. Baher, M.D. Kohler, K. Thygesen, G. Simila, Gordon R. Keller
2003, Geology (31) 171-174
We have constructed a composite image of the fault systems of the M 6.7 San Fernando (1971) and Northridge (1994), California, earthquakes, using industry reflection and oil test well data in the upper few kilometers of the crust, relocated aftershocks in the seismogenic crust, and LARSE II (Los Angeles Region...
Potential effects of climate change on ground water in Lansing, Michigan
T.E. Croley II, C. L. Luukkonen
2003, Journal of the American Water Resources Association (39) 149-163
Computer simulations involving general circulation models, a hydrologic modeling system, and a ground water flow model indicate potential impacts of selected climate change projections on ground water levels in the Lansing, Michigan, area. General circulation models developed by the Canadian Climate Centre and the Hadley Centre generated meteorology estimates for...
Home range and movements of boreal toads in undisturbed habitat
E. Muths
2003, Copeia 160-165
I sampled movements and amount of area used by boreal toads (Bufo boreas) between June and October for 3 yr. Females were found farther from the breeding site than were males, and mean home ranges, as calculated by the adaptive kernel method, were four times larger for females than for males. Temperature and snow accumulation were comparable...
Modeling carbon dynamics in vegetation and soil under the impact of soil erosion and deposition
S. Liu, N. Bliss, E. Sundquist, T.G. Huntington
2003, Global Biogeochemical Cycles (17)
Soil erosion and deposition may play important roles in balancing the global atmospheric carbon budget through their impacts on the net exchange of carbon between terrestrial ecosystem and the atmosphere. Few models and studies have been designed to assess these impacts. In this study, we developed a general ecosystem model,...
Quantitative analysis of seismic fault zone waves in the rupture zone of the 1992 Landers, California, earthquake: Evidence for a shallow trapping structure
Z. Peng, Y. Ben-Zion, A.J. Michael, L. Zhu
2003, Geophysical Journal International (155) 1021-1041
We analyse quantitatively a waveform data set of 238 earthquakes recorded by a dense seismic array across and along the rupture zone of the 1992 Landers earthquake. A grid-search method with station delay corrections is used to locate events that do not have catalogue locations. The quality of fault zone...
Demographics and chronology of a spawning aggregation of blue sucker (Cycleptus elongatus) in the Grand River, Missouri, USA
Jason C. Vokoun, Travis L. Guerrant, Charles F. Rabeni
2003, Journal of Freshwater Ecology (18) 567-575
The blue sucker (Cycleptus elongatus) was sampled as individuals arrived, spawned, and departed from a spawning rime in the Grand River of northcentral Missouri, USA. The Grand River basin was not known to support blue sucker reproduction with few individuals ever recorded. The spawning site is unique in...
Landsat multispectral sharpening using a sensor system model and panchromatic image
G.P. Lemeshewsky
Rahman Z.Schowengerdt R.A.Reichenbach S.E., editor(s)
2003, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
The thematic mapper (TM) sensor aboard Landsats 4, 5 and enhanced TM plus (ETM+) on Landsat 7 collect imagery at 30-m sample distance in six spectral bands. New with ETM+ is a 15-m panchromatic (P) band. With image sharpening techniques, this higher resolution P data, or as an alternative, the...
An evaluation of sediment rating curves for estimating suspended sediment concentrations for subsequent flux calculations
A. J. Horowitz
2003, Hydrological Processes (17) 3387-3409
In the absence of actual suspended sediment concentration (SSC) measurements, hydrologists have used sediment rating (sediment transport) curves to estimate (predict) SSCs for subsequent flux calculations. Various evaluations of the sediment rating-curve method were made using data from long-term, daily sediment-measuring sites within large (>1 000 000 km2), medium (<1...
Mars Exploration Rover engineering cameras
J.N. Maki, J.F. Bell III, Kenneth E. Herkenhoff, S. W. Squyres, A. Kiely, M. Klimesh, M. Schwochert, T. Litwin, R. Willson, Aaron H. Johnson, M. Maimone, E. Baumgartner, A. Collins, M. Wadsworth, S.T. Elliot, A. Dingizian, D. Brown, E.C. Hagerott, L. Scherr, R. Deen, D. Alexander, J. Lorre
2003, Journal of Geophysical Research E: Planets (108)
In January 2004 the Mars Exploration Rover mission will land two rovers at two different landing sites that show possible evidence for past liquid‐water activity. The spacecraft design is based on the Mars Pathfinder configuration for cruise and entry, descent, and landing. Each of the identical rovers is equipped with...
Nitrogen vs. phosphorus limitation across an ecotonal gradient in a mangrove forest
Ilka C. Feller, K.L. McKee, D.F. Whigham, J.P. O’Neill
2003, Biogeochemistry (62) 145-175
Mangrove forests are characterized by distinctive tree-height gradients that reflect complex spatial, within-stand differences in environmental factors, including nutrient dynamics, salinity, and tidal inundation, across narrow gradients. To determine patterns of nutrient limitation and the effects of nutrient availability on plant growth and within-stand nutrient dynamics, we used a factorial...
