Toward mapping surface deformation in three dimensions using InSAR
Tim J. Wright, Barry E. Parsons, Zhong Lu
2004, Geophysical Research Letters (31)
One of the limitations of deformation measurements made with interferometric synthetic aperture radar (InSAR) is that an interferogram only measures one component of the surface deformation — in the satellite's line of sight. We investigate strategies for mapping surface deformation in three dimensions by using multiple interferograms, with different imaging...
Hydrated states of MgSO4 at equatorial latiudes on Mars
W. C. Feldman, M. T. Mellon, S. Maurice, T.H. Prettyman, J.W. Carey, D. T. Vaniman, D.L. Bish, C.I. Fialips, S.J. Chipera, J.S. Kargel, R.C. Elphic, H.O. Funsten, D. J. Lawrence, R.L. Tokar
2004, Geophysical Research Letters (31)
The stability of water ice, epsomite, and hexahydrite to loss of H 2O molecules to the atmosphere at equatorial latitudes of Mars was studied to determine their potential contributions to the measured abundance of water-equivalent hydrogen (WEH). Calculation of the relative humidity based on estimates of yearly averages of water-vapor...
Spawning ecology of finespotted Snake River cutthroat trout in spring streams of the Salt River valley, Wyoming
M. P. Joyce, W.A. Hubert
2004, Western North American Naturalist (64) 78-85
We studied spawning ecology of cutthroat trout (Oncorhynchus clarki) in streams that originate as springs along the Salt River, a Snake River tributary in western Wyoming. We assessed (1) relative numbers of upstream-migrant and resident adults present during the spawning period in spring streams, (2) influence of habitat modification on...
Wave- and tidally-driven flow and sediment flux across a fringing coral reef: Southern Molokai, Hawaii
C. D. Storlazzi, A.S. Ogston, Michael H. Bothner, M.E. Field, M.K. Presto
2004, Continental Shelf Research (24) 1397-1419
The fringing coral reef off the south coast of Molokai, Hawaii is currently being studied as part of a US Geological Survey (USGS) multi-disciplinary project that focuses on geologic and oceanographic processes that affect coral reef systems. For this investigation, four instrument packages were deployed across the fringing coral reef...
Emissions pathways, climate change, and impacts on California
K. Hayhoe, D. Cayan, C.B. Field, P.C. Frumhoff, E.P. Maurer, N.L. Miller, S.C. Moser, S.H. Schneider, K.N. Cahill, E.E. Cleland, L. Dale, R. Drapek, R.M. Hanemann, L.S. Kalkstein, J. Lenihan, C.K. Lunch, R.P. Neilson, S.C. Sheridan, J.H. Verville
2004, Proceedings of the National Academy of Sciences of the United States of America (101) 12422-12427
The magnitude of future climate change depends substantially on the greenhouse gas emission pathways we choose. Here we explore the implications of the highest and lowest Intergovernmental Panel on Climate Change emissions pathways for climate change and associated impacts in California. Based on climate projections from two state-of-the-art climate models...
Geographic variation in patterns of nestedness among local stream fish assemblages in Virginia
R.R. Cook, P. L. Angermeier, D.S. Finn, N.L. Poff, K.L. Krueger
2004, Oecologia (140) 639-649
Nestedness of faunal assemblages is a multiscale phenomenon, potentially influenced by a variety of factors. Prior small-scale studies have found freshwater fish species assemblages to be nested along stream courses as a result of either selective colonization or extinction. However, within-stream gradients in temperature and other factors are correlated with...
Historical trends in occurrence and atmospheric inputs of halogenated volatile organic compounds in untreated ground water used as a source of drinking water
S.D. Shapiro, E. Busenberg, M. J. Focazio, Niel Plummer
2004, Science of the Total Environment (321) 201-217
Analyses of samples of untreated ground water from 413 community-, non-community- (such as restaurants), and domestic-supply wells throughout the US were used to determine the frequency of detection of halogenated volatile organic compounds (VOCs) in drinking-water sources. The VOC data were compiled from archived...
Foraging distance and home range of Cassin's Auklets nesting at two colonies in the California Channel Islands
Josh Adams, John Y. Takekawa, Harry R. Carter
2004, Condor (106) 618-637
We radio-marked 99 Cassin's Auklets (Ptychoramphus aleuticus) nesting at two colonies, Prince Island and Scorpion Rock, separated by 90 km in the California Channel Islands to quantify foraging distance, individual home-range area, and colony-based foraging areas during three consecutive breeding seasons. Auklets generally foraged < 30 km from each colony...
The global short-period wavefield modelled with a Monte Carlo seismic phonon method
Peter M. Shearer, Paul S. Earle
2004, Geophysical Journal International (158) 1103-1117
At high frequencies (∼1 Hz), much of the seismic energy arriving at teleseismic distances is not found in the main phases (e.g. P, PP, S, etc.) but is contained in the extended coda that follows these arrivals. This coda results from scattering off small-scale velocity and density perturbations within the...
Monitoring suspended sediment and associated trace element and nutrient fluxes in large river basins in the USA
A. J. Horowitz
2004, Conference Paper, IAHS-AISH Publication
In 1996, the US Geological Survey converted its occurrence and distribution-based National Stream Quality Accounting Network (NASQAN) to a national, flux-based water-quality monitoring programme. The main objective of the revised programme is to characterize large USA river basins by measuring the fluxes of selected constituents at critical nodes in various...
A biogeochemical comparison of two well-buffered catchments with contrasting histories of acid deposition
J. B. Shanley, P. Kram, J. Hruska, T.D. Bullen
2004, Water, Air, and Soil Pollution: Focus (4) 325-342
Much of the biogeochemical cycling research in catchments in the past 25 years has been driven by acid deposition research funding. This research has focused on vulnerable base-poor systems; catchments on alkaline lithologies have received little attention. In regions of high acid loadings, however, even well-buffered catchments are susceptible...
A new species of Dyoros (Brachiopoda; Chonetoidea) from Nevada (United States) and stratigraphic implications for the Pennsylvanian and Permian Antler Overlap assemblage [Une nouvelle espèce de Dyoros (Brachiopoda; Chonetoidea) du Nevada (États-Unis) et implications stratigraphiques pour le Complexe chevauchant d'Antler (Pennsylvanien et Permien)]
Patrick R. Racheboeuf, Thomas E. Moore, Robert B. Blodgett
2004, Geobios (37) 382-394
Newly discovered fossil localities in coarse-grained deposits of the Pennsylvanian and Permian Antler overlap assemblage in the southern Shoshone Range, north-central Nevada have yielded a low-diversity assemblage consisting chiefly of a new species of chonetoidean brachiopod: Dyoros (Lissosia) nevadaensis nov. sp. The subgenus Dyoros (Lissosia), is known from Leonardian and...
The Rock Elm meteorite impact structure, Wisconsin: Geology and shock-metamorphic effects in quartz
B.M. French, W.S. Cordua, J. B. Plescia
2004, Geological Society of America Bulletin (116) 200-218
The Rock Elm structure in southwest Wisconsin is an anomalous circular area of highly deformed rocks, ∼6.5 km in diameter, located in a region of virtually horizontal undeformed sedimentary rocks. Shock-produced planar microstructures (PMs) have been identified in quartz grains in several lithologies associated with the structure: sandstones, quartzite pebbles,...
Near-field ground motion of the 2002 Denali fault, Alaska, earthquake recorded at pump station 10
W.L. Ellsworth, M. Çelebi, J.R. Evans, E.G. Jensen, R. Kayen, M.C. Metz, D.J. Nyman, J.W. Roddick, P. Spudich, C.D. Stephens
2004, Earthquake Spectra (20) 597-615
A free-field recording of the Denali fault earthquake was obtained by the Alyeska Pipeline Service Company 3 km from the surface rupture of the Denali fault. The instrument, part of the monitoring and control system for the trans-Alaska pipeline, was located at Pump Station 10, approximately 85 km east of...
Life history and propagation of the endangered dromedary pearlymussel (Dromus dromas) (Bivalvia:Unionidae)
J. W. Jones, R. J. Neves, S.A. Ahlstedt, R.A. Mair
2004, Journal of the North American Benthological Society (23) 515-525
The reproduction, demography, and propagation of the endangered dromedary pearlymussel (Dromus dromas) (Lea, 1834) were studied in the Clinch and Powell rivers, Tennessee. Viable populations of the dromedary pearlymussel now occur only in the Clinch and Powell rivers; the species has been extirpated from the remaining portions of its range...
Improved 206Pb/238U microprobe geochronology by the monitoring of a trace-element-related matrix effect; SHRIMP, ID-TIMS, ELA-ICP-MS and oxygen isotope documentation for a series of zircon standards
L.P. Black, S.L. Kamo, C. M. Allen, D.W. Davis, J. N. Aleinikoff, J.W. Valley, R. Mundil, I.H. Campbell, R.J. Korsch, I.S. Williams, C. Foudoulis
2004, Chemical Geology (205) 115-140
Precise isotope dilution-thermal ionisation mass spectrometry (ID-TIMS) documentation is given for two new Palaeozoic zircon standards (TEMORA 2 and R33). These data, in combination with results for previously documented standards (AS3, SL13, QGNG and TEMORA 1), provide the basis for a detailed investigation of inconsistencies in 206Pb/238U ages measured by...
Age and growth of flathead catfish, Pylodictus olivaris rafinesque, in the Altamaha River system, Georgia
T.B. Grabowski, J. Jeffery Isely, R.R. Weller
2004, Journal of Freshwater Ecology (19) 411-417
Flathead catfish were introduced to the Altamaha River system, Georgia in the 1970's. We determined the length-weight relationship, Von Bertalanffy growth parameters, and back calculated lengths by examining the sagittal otoliths of 331 individuals captured from this population. We found that there were no sex related differences in length weight...
Estimates of diffuse phosphorus sources in surface waters of the United States using a spatially referenced watershed model
R. B. Alexander, R. A. Smith, G. E. Schwarz
2004, Water Science and Technology (49) 1-10
The statistical watershed model SPARROW (SPAtially Referenced Regression On Watershed attributes) was used to estimate the sources and transport of total phosphorus (TP) in surface waters of the United States. We calibrated the model using stream measurements of TP from 336 watersheds of mixed land use and spatial data on...
Diets and foraging behavior of northern Spotted Owls in Oregon
E.D. Forsman, R.G. Anthony, E. Charles Meslow, C.J. Zabel
2004, Journal of Raptor Research (38) 214-230
We describe local, regional, and annual variation in diets of northern Spotted Owls (Strix occidentalis caurina) in Oregon based on 24 497 prey collected at 1118 owl territories in 1970-2003. The sample included 91.5% mammals, 4.3% birds, 4.1% insects, and 0.1% other prey. The diet included ???131 species, including 49...
Assessing development pressure in the Chesapeake Bay watershed: An evaluation of two land-use change models
Peter R. Claggett, Claire A. Jantz, S.J. Goetz, C. Bisland
2004, Environmental Monitoring and Assessment (94) 129-146
Natural resource lands in the Chesapeake Bay watershed are increasingly susceptible to conversion into developed land uses, particularly as the demand for residential development grows. We assessed development pressure in the Baltimore-Washington, DC region, one of the major urban and suburban centers in the watershed. We explored the utility of...
Exposure to perchlorate induces the formation of macrophage aggregates in the trunk kidney of zebrafish and mosquitofish
T. Capps, S. Mukhi, J.J. Rinchard, C.W. Theodorakis, V. S. Blazer, R. Patino
2004, Journal of Aquatic Animal Health (16) 145-151
Environmental contamination of ground and surface waters by perchlorate, derived from ammonium perchlorate (AP) and other perchlorate salts, is of increasing concern. Exposure to perchlorate can impair the thyroid endocrine system, which is thought to modulate renal and immune function in vertebrates. This study with zebrafish Danio rerio and eastern...
A definitive calibration record for the Landsat-5 thematic mapper anchored to the Landsat-7 radiometric scale
P.M. Teillet, D. L. Helder, T.A. Ruggles, R. Landry, F.J. Ahern, N.J. Higgs, J. Barsi, G. Chander, B. L. Markham, J. L. Barker, K. J. Thome, J. R. Schott, Frank Don Palluconi
2004, Canadian Journal of Remote Sensing (30) 631-643
A coordinated effort on the part of several agencies has led to the specification of a definitive radiometric calibration record for the Landsat-5 thematic mapper (TM) for its lifetime since launch in 1984. The time-dependent calibration record for Landsat-5 TM has been placed on the same radiometric scale as the...
Effects of predation risk on habitat selection by water column fish, benthic fish and crayfish in stream pools
D.D. Magoulick
2004, Hydrobiologia (527) 209-221
Predation risk can affect habitat selection by water column stream fish and crayfish, but little is known regarding effects of predation risk on habitat selection by benthic fish or assemblages of fish and crayfish. I used comparative studies and manipulative field experiments to determine whether, (1) habitat selection by stream...
Relations among habitat characteristics, exotic species, and turbid-river cyprinids in the Missouri River drainage of Wyoming
M.C. Quist, W.A. Hubert, F.J. Rahel
2004, Transactions of the American Fisheries Society (133) 727-742
We used data from 91 stream reaches in the Missouri River drainage of Wyoming to determine whether abiotic and biotic factors were related to the abundance of four cyprinid species associated with turbid-river environments: flathead chub Platygobio gracilis, sturgeon chub Macrhybopsis gelida, plains minnow Hybognathus placitus, and western silvery minnow...
Submarine landslides of San Pedro Escarpment, southwest of Long Beach, California
R. G. Bohannon, J.V. Gardner
2004, Conference Paper, Marine Geology
The coastal infrastructure of the southern greater Los Angeles metropolitan area would be profoundly affected by a large tsunami. Submarine slope failures and active faults, either of which could have generated a tsunami, are known on the shelf and slope near Long Beach. Large slope failures are present on the...
