Loosely bound oxytetracycline in riverine sediments from two tributaries of the Chesapeake Bay
N.S. Simon
2005, Environmental Science & Technology (39) 3480-3487
The fate of antibiotics that bind to riverine sediment is not well understood. A solution used in geochemical extraction schemes to determine loosely bound species in sediments, 1 M MgCl2 (pH 8), was chosen to determine loosely bound, and potentially bioavailable, tetracycline antibiotics (TCs), including oxytetracycline (5-OH tetracycline)...
Technical review of the status of Northern Goshawks in the western United States
D. E. Andersen, S. DeStefano, M.I. Goldstein, K. Titus, C. Crocker-Bedford, J.J. Keane, R.G. Anthony, Robert N. Rosenfield
2005, Journal of Raptor Research (39) 192-209
The U.S. Fish and Wildlife Service (FWS) was petitioned in 1997 to consider listing Northern Goshawks (Accipiter gentilis atricapillus) under the Endangered Species Act of 1973, west of the 100th meridian of the contiguous United States. In their 12-mo finding issued in June 1998, the FWS determined that listing this...
Factors influencing the biogeochemistry of sedimentary carbon and phosphorus in the Sacramento-San Joaquin Delta
E. B. Nilsen, M. L. Delaney
2005, Estuaries (28) 653-663
This study characterizes organic carbon (Corganic) and phosphorus (P) geochemistry in surface sediments of the Sacramento-San Joaquin Delta, California. Sediment cores were collected from five sites on a sample transect from the edge of the San Francisco Bay eastward to the freshwater Consumnes River. The top 8 cm of each...
The 2003 eruption of Anatahan volcano, Commonwealth of the Northern Mariana Islands: Chronology, volcanology, and deformation
F. A. Trusdell, R. B. Moore, M. Sako, R.A. White, S.K. Koyanagi, R. Chong, J.T. Camacho
2005, Journal of Volcanology and Geothermal Research (146) 184-207
The first historical eruption on Anatahan Island occurred on 10 May 2003 from the east crater of the volcano. The eruption was preceded by several hours of seismicity. Two and a half hours before the outbreak, the number of earthquakes surged to more than 100 events per hour. At 0730...
Natural landscape features, human-related attractants, and conflict hotspots: A spatial analysis of human-grizzly bear conflicts
S.M. Wilson, M.J. Madel, D.J. Mattson, J.M. Graham, J.A. Burchfield, J.M. Belsky
2005, Ursus (16) 117-129
There is a long history of conflict in the western United States between humans and grizzly bears (Ursus arctos) involving agricultural attractants. However, little is known about the spatial dimensions of this conflict and the relative importance of different attractants. This study was undertaken to better understand the spatial and...
The Coso EGS project - Recent developments
P. Rose, J. Sheridan, J. McCulloch, J.N. Moore, K. Kovac, R. Weidler, S. Hickman
2005, Conference Paper, Geothermal Energy--The World's Buried Treasure
An Enhanced Geothermal System (EGS) field experiment will be conducted to hydraulically stimulate injection well 34-9RD2, located on the east flank of the Coso geothermal reservoir, with the objective of increasing the injection rate of this well to 750 gpm at a wellhead pressure of 100 psi or less. The...
Assessing the competitive ability of Japanese stilt grass, Microstegium vimineum (Trin.) A. Camus
S. A. Leicht, J. A. Silander Jr., K. Greenwood
2005, Journal of the Torrey Botanical Society (132) 573-580
Microstegium vimineum (Japanese stilt grass) is an invasive grass in the eastern half of the United States which can form dense monocultures in forest understories, displacing native species. Although the loss of native species has been observed in the field, the actual competitive ability of this grass has not been...
Structure and variability of the Western Maine Coastal Current
J.H. Churchill, N.R. Pettigrew, R. P. Signell
2005, Deep-Sea Research Part II: Topical Studies in Oceanography (52) 2392-2410
Analyses of CTD and moored current meter data from 1998 and 2000 reveal a number of mechanisms influencing the flow along the western coast of Maine. On occasions, the Eastern Maine Coastal Current extends into the western Gulf of Maine where it takes the form of a deep (order 100...
The Pinto shear zone; a Laramide synconvergent extensional shear zone in the Mojave Desert region of the southwestern United States
M.L. Wells, M.A. Beyene, T.L. Spell, J.L. Kula, D. M. Miller, K.A. Zanetti
2005, Journal of Structural Geology (27) 1697-1720
The Pinto shear zone is one of several Late Cretaceous shear zones within the eastern fringe of the Mesozoic magmatic arc of the southwest Cordilleran orogen that developed synchronous with continued plate convergence and backarc shortening. We demonstrate an extensional origin for the shear zone by describing the shear-zone geometry...
The kinematic and hydrographic structure of the Gulf of Maine Coastal Current
N.R. Pettigrew, J.H. Churchill, C.D. Janzen, L.J. Mangum, R. P. Signell, A.C. Thomas, D.W. Townsend, J.P. Wallinga, H. Xue
2005, Deep-Sea Research Part II: Topical Studies in Oceanography (52) 2369-2391
The Gulf of Maine Coastal Current (GMCC), which extends from southern Nova Scotia to Cape Cod Massachusetts, was investigated from 1998 to 2001 by means of extensive hydrographic surveys, current meter moorings, tracked drifters, and satellite-derived thermal imagery. The study focused on two principal branches of the GMCC, the Eastern...
Foraging ecology of Caspian Terns in the Columbia River Estuary, USA
Donald E. Lyons, Daniel D. Roby, Ken Collis
2005, Waterbirds (28) 280-291
Comparisons were made of the foraging ecology of Caspian Terns (Sterna caspia) nesting on two islands in the Columbia River estuary using radio telemetry and observations of prey fed to chicks and mates at each colony. Early in the chick-rearing period, radio-tagged terns nesting...
Magmatic unrest beneath Mammoth Mountain, California
D.P. Hill, S. Prejean
2005, Journal of Volcanology and Geothermal Research (146) 257-283
Mammoth Mountain, which stands on the southwest rim of Long Valley caldera in eastern California, last erupted ∼57,000 years BP. Episodic volcanic unrest detected beneath the mountain since late 1979, however, emphasizes that the underlying volcanic system is still active and capable of producing future volcanic eruptions. The unrest symptoms...
An efficient algorithm for double-difference tomography and location in heterogeneous media, with an application to the Kilauea volcano
V. Monteiller, J.-L. Got, J. Virieux, P. Okubo
2005, Journal of Geophysical Research B: Solid Earth (110) 1-22
Improving our understanding of crustal processes requires a better knowledge of the geometry and the position of geological bodies. In this study we have designed a method based upon double-difference relocation and tomography to image, as accurately as possible, a heterogeneous medium containing seismogenic objects. Our approach consisted not only...
Further evidence for the invasion and establishment of Pterois volitans (Teleostei: Scorpaenidae) along the Atlantic Coast of the United States
H.S. Meister, D.M. Wyanski, J.K. Loefer, Steve W. Ross, A.M. Quattrini, K. J. Sulak
2005, Southeastern Naturalist (4) 193-206
We document the continued population expansion of red lionfish, Pterois volitans, the first documented successful introduction of an invasive marine fish species from the western Pacific to Atlantic coastal waters of the United States. Red lionfish are indigenous to the Indo-Pacific and have apparently established one or more breeding populations...
An evaluation of sampling strategies to improve precision of estimates of gross change in land use and land cover
S.V. Stehman, Terry L. Sohl, Thomas R. Loveland
2005, International Journal of Remote Sensing (26) 4941-4957
Statistical sampling offers a cost-effective, practical alternative to complete-coverage mapping for the objective of estimating gross change in land cover over large areas. Because land cover change is typically rare, the sampling strategy must take advantage of design and analysis tools that enhance precision. Using two populations of land cover...
Northwest Basin and Range tectonic deformation observed with the Global Positioning System, 1999-2003
W.C. Hammond, W. Thatcher
2005, Journal of Geophysical Research B: Solid Earth (110) 1-12
We use geodetic velocities obtained with the Global Positioning System (GPS) to quantify tectonic deformation of the northwest Basin and Range province of the western United States. The results are based on GPS data collected in 1999 and 2003 across five new quasi-linear networks in northern Nevada, northeast California, and...
Revised magnitude-bound relation for the Wabash Valley seismic zone of the central United States
Scott M. Olson, Russell A. Green, Stephen F. Obermeier
2005, Seismological Research Letters (76) 756-771
Seismic hazard assessment in the central United States, and in particular the Wabash Valley seismic zone of Indiana-Illinois, frequently relies on empirical estimates of paleoearthquake magnitudes (M). In large part these estimates have been made using the magnitude-bound method. Existing region-specific magnitude-bound relations rely heavily on only a few historical...
Seasonal seismicity at western United States volcanic centers
L.B. Christiansen, S. Hurwitz, M.O. Saar, S. E. Ingebritsen, P. A. Hsieh
2005, Earth and Planetary Science Letters (240) 307-321
We examine 20-yr data sets of seismic activity from 10 volcanic areas in the western United States for annual periodic signals (seasonality), focusing on large calderas (Long Valley caldera and Yellowstone) and stratovolcanoes (Cascade Range). We apply several statistical methods to test for seasonality in the seismic catalogs. In 4...
Evidence for Mojave-Sonora megashear-Systematic left-lateral offset of Neoproterozoic to Lower Jurassic strata and facies, western United States and northwestern Mexico
John H. Stewart
2005, Special Paper of the Geological Society of America (393) 209-231
Major successions as well as individual units of Neoproterozoic to Lower Jurassic strata and facies appear to be systematically offset left laterally from eastern California and western Nevada in the western United States to Sonora, Mexico. This pattern is most evident in units such as the “Johnnie oolite,” a 1-...
North American Brant: Effects of changes in habitat and climate on population dynamics
David H. Ward, Austin Reed, James S. Sedinger, Jeffrey M. Black, Dirk V. Derksen, Paul M. Castelli
2005, Global Change Biology (11) 869-880
We describe the importance of key habitats used by four nesting populations of nearctic brant (Branta bernicla) and discuss the potential relationship between changes in these habitats and population dynamics of brant. Nearctic brant, in contrast to most geese, rely on marine habitats and native intertidal plants during the non-breeding...
Paleoproterozoic Mojave Province in northwestern Mexico? Isotopic and U-Pb zircon geochronologic studies of Precambrian and Cambrian crystalline and sedimentary rocks, Caborca, Sonora
G. Lang Farmer, S. A. Bowring, J. Matzel, G.E. Maldonado, C. Fedo, J. Wooden
2005, Special Paper of the Geological Society of America (393) 183-198
Whole-rock Nd isotopic data and U-Pb zircon geochronology from Precambrian crystalline rocks in the Caborca area, northern Sonora, reveal that these rocks are most likely a segment of the Paleoproterozoic Mojave province. Supporting this conclusion are the observations that paragneiss from the > or =1.75 Ga Bamori Complex has a...
Factors affecting settling, survival, and viability of black bears reintroduced to Felsenthal National Wildlife Refuge, Arkansas
B.J. Wear, R. Eastridge, J. D. Clark
2005, Wildlife Society Bulletin (33) 1363-1374
We used radiotelemetry and population modeling techniques to examine factors related to population establishment of black bears (Ursus americanus) reintroduced to Felsenthal National Wildlife Refuge (NWR), Arkansas. Our objectives were to determine whether settling (i.e., establishment of a home range at or near the release site), survival, recruitment, and population...
Contemporaneous trachyandesitic and calc-alkaline volcanism of the Huerto Andesite, San Juan Volcanic Field, Colorado, USA
F. Parat, M.A. Dungan, P. W. Lipman
2005, Journal of Petrology (46) 859-891
Locally, voluminous andesitic volcanism both preceded and followed large eruptions of silicic ash-flow tuff from many calderas in the San Juan volcanic field. The most voluminous post-collapse lava suite of the central San Juan caldera cluster is the 28 Ma Huerto Andesite, a diverse assemblage erupted from at least 5–6 volcanic...
Reconnaissance study of late quaternary faulting along Cerro Goden fault zone, western Puerto Rico
P. Mann, C.S. Prentice, J.-C. Hippolyte, N.R. Grindlay, L.J. Abrams, D. Lao-Davila
2005, Special Paper of the Geological Society of America (385) 115-137
The Cerro Goden fault zone is associated with a curvilinear, continuous, and prominent topographic lineament in western Puerto Rico. The fault varies in strike from northwest to west. In its westernmost section, the fault is ∼500 m south of an abrupt, curvilinear mountain front separating the 270- to 361-m-high La...
Eastern rim of the Chesapeake Bay impact crater: Morphology, stratigraphy, and structure
C. W. Poag
2005, Special Paper of the Geological Society of America 117-130
This study reexamines seven reprocessed (increased vertical exaggeration) seismic reflection profiles that cross the eastern rim of the Chesapeake Bay impact crater. The eastern rim is expressed as an arcuate ridge that borders the crater in a fashion typical of the "raised" rim documented in many well preserved complex impact...
