Methylmercury in flood-control impoundments and natural waters of northwestern Minnesota, 1997-99
M. E. Brigham, D. P. Krabbenhoft, M.L. Olson, J.F. DeWild
2002, Water, Air, & Soil Pollution (138) 61-78
We studied methylmercury (MeHg) and total mercury (HgT) in impounded and natural surface waters in northwestern Minnesota, in settings ranging from agricultural to undeveloped. In a recently constructed (1995) permanent-pool impoundment, MeHg levels typically increased from inflow to outflow during 1997; this trend broke down from late 1998 to early...
The 1999 Izmit, Turkey, earthquake: A 3D dynamic stress transfer model of intraearthquake triggering
R.A. Harris, J.F. Dolan, R. Hartleb, S.M. Day
2002, Bulletin of the Seismological Society of America (92) 245-255
Before the August 1999 Izmit (Kocaeli), Turkey, earthquake, theoretical studies of earthquake ruptures and geological observations had provided estimates of how far an earthquake might jump to get to a neighboring fault. Both numerical simulations and geological observations suggested that 5 km might be the upper limit if there were...
Effects of sludge filtrate on the survival and reproduction of Ceriodaphnia dubia
S.S. Veerina, N. C. Parker, C.B. Fedler
2002, Ecotoxicology (11) 113-118
The objective of this study was to determine if the runoff from croplands fertilized with municipal sludge was toxic to aquatic biota and, therefore, a potential threat to either public health or the environment. Seven-day bioassays with Ceriodaphnia dubia showed that the No-Observed-Effect-Concentration (NOEC) was 24 g/L and the Lowest-Observed-Effect-Concentration...
Cripple Creek and other alkaline-related gold deposits in the Southern Rocky Mountains, USA: Influence of regional tectonics
Karen D. Kelley, Steve Ludington
2002, Mineralium Deposita (37) 38-60
Alkaline-related epithermal vein, breccia, disseminated, skarn, and porphyry gold deposits form a belt in the southern Rocky Mountains along the eastern edge of the North American Cordillera. Alkaline igneous rocks and associated hydrothermal deposits formed at two times. The first was during the Laramide orogeny (about 70–40 Ma), with deposits restricted...
Comments on baseline correction of digital strong-motion data: Examples from the 1999 Hector Mine, California, earthquake
D.M. Boore, C.D. Stephens, W. B. Joyner
2002, Bulletin of the Seismological Society of America (92) 1543-1560
Residual displacements for large earthquakes can sometimes be determined from recordings on modern digital instruments, but baseline offsets of unknown origin make it difficult in many cases to do so. To recover the residual displacement, we suggest tailoring a correction scheme by studying the character of the velocity obtained by...
Influence of eastern hemlock (Tsuga canadensis) forests on aquatic invertebrate assemblages in headwater streams
C.D. Snyder, J.A. Young, D. P. Lemarie, D. R. Smith
2002, Canadian Journal of Fisheries and Aquatic Sciences (59) 262-275
We conducted a comparative study in the Delaware Water Gap National Recreation Area to determine the potential long-term impacts of hemlock forest decline on stream benthic macroinvertebrate assemblages. Hemlock forests throughout eastern North America have been declining because of the hemlock woolly adelgid, an exotic insect pest. We found aquatic...
Ancient and modern subduction zone contributions to the mantle sources of lavas from the Lassen region of California inferred from Lu-Hf isotopic systematics
L. E. Borg, Janne Blichert-Toft, Michael A. Clynne
2002, Journal of Petrology (43) 705-723
Hafnium isotopic compositions have been determined on a suite of calc-alkaline and high-alumina-olivine tholeiitic lavas from the Lassen region of California and are used, in conjunction with previously published mineralogical, geochemical, and isotopic data, to constrain their petrogenesis. Positive correlation between εHf values and geochemical indices of the modern subduction component...
Derivation of a tasselled cap transformation based on Landsat 7 at-satellite reflectance
Chengquan Huang, Bruce K. Wylie, Limin Yang, Collin G. Homer, G. Zylstra
2002, International Journal of Remote Sensing (23) 1741-1748
A new tasselled cap transformation based on Landsat 7 at-satellite reflectance was developed. This transformation is most appropriate for regional applications where atmospheric correction is not feasible. The brightness, greenness and wetness of the derived transformation collectively explained over 97% of the spectral variance of the individual scenes used in...
The genera flavobacterium and flexibacter
J.A. Bader, C. E. Starliper
C.O. Cunningham, editor(s)
2002, Book chapter, Molecular Diagnosis of Salmonid Diseases
No abstract available at this time...
Experiences from the testing of a theory for modelling groundwater flow in heterogeneous media
S. Christensen, R.L. Cooley
2002, Acta Universitatis Carolinae, Geologica (46) 8-11
Usually, small-scale model error is present in groundwater modelling because the model only represents average system characteristics having the same form as the drift and small-scale variability is neglected. These errors cause the true errors of a regression model to be correlated. Theory and an example show that the errors...
234U/238U evidence for local recharge and patterns of groundwater flow in the vicinity of Yucca Mountain, Nevada, USA
J.B. Paces, K.R. Ludwig, Z. E. Peterman, L.A. Neymark
2002, Applied Geochemistry (17) 751-779
Uranium concentrations and 234U/238U ratios in saturated-zone and perched ground water were used to investigate hydrologic flow and downgradient dilution and dispersion in the vicinity of Yucca Mountain, a potential high-level radioactive waste disposal site. The U data were obtained by thermal ionization mass spectrometry on more than 280 samples...
Pockmarks off Big Sur, California
C. Paull, W. Ussler III, N. Maher, H. Gary Greene, G. Rehder, T. Lorenson, H. Lee
2002, Marine Geology (181) 323-335
A pockmark field was discovered during EM-300 multi-beam bathymetric surveys on the lower continental slope off the Big Sur coast of California. The field contains ??? 1500 pockmarks which are between 130 and 260 m in diameter, and typically are 8-12 m deep located within a 560 km2 area. To...
Geologic and paleoseismic study of the Lavic Lake fault at Lavic Lake Playa, Mojave Desert, southern California
M. J. Rymer, G. G. Seitz, K. D. Weaver, A. Orgil, G. Faneros, J. C. Hamilton, C. Goetz
2002, Bulletin of the Seismological Society of America (92) 1577-1591
Paleoseismic investigations of the Lavic Lake fault at Lavic Lake playa place constraints on the timing of a possible earlier earthquake along the 1999 Hector Mine rupture trace and reveal evidence of the timing of the penultimate earthquake on a strand of the Lavic Lake fault that did not rupture...
Description of nests, eggs, and nestlings of the endangered nightingale reed-warbler on Saipan, Micronesia
Stephen M. Mosher, Steven G. Fancy
2002, The Wilson Bulletin (114) 1-10
We describe the first verified nests, eggs, and nestlings of the Nightingale Reed-Warbler (Acrocephalus luscinia), an endangered species endemic to the Mariana Islands, Micronesia. Nest composition, nest dimensions, and eggs were studied on the island of Saipan. Nests were located within three habitat types: upland introduced tangantangan (Leucaena...
A comparative assessment of genetic diversity among differently-aged populations of Spartina alterniflora on restored versus natural wetlands
S.E. Travis, C.E. Proffitt, R.C. Lowenfeld, T.W. Mitchell
2002, Restoration Ecology (10) 37-42
We collected naturally recolonizing Spartina alterniflora (smooth cord grass) from each of three restored sites and one undisturbed reference site in southwestern Louisiana to assess the impact of wetland restoration on genetic diversity. We used amplified fragment length polymorphisms (AFLPs) to produce 94 polymorphic genetic markers, which were used to...
Impacts of climate change on the global forest sector
J. Perez-Garcia, L.A. Joyce, A. D. McGuire, X. Xiao
2002, Climatic Change (54) 439-461
The path and magnitude of future anthropogenic emissions of carbon dioxide will likely influence changes in climate that may impact the global forest sector. These responses in the global forest sector may have implications for international efforts to stabilize the atmospheric concentration of carbon dioxide. This study takes a step...
Angeles and San Bernardino National Forest, Mountain Yellow-Legged Frog (Rana muscosa) Surveys, 2001
A. Backlin, C. Haas, Robert N. Fisher
2002, Report, Prepared for Angeles National Forest, San Bernardino National Forest.
No abstract available at this time...
Syntectonic remagnetization in the southern Methow block: Resolving large displacements in the southern Canadian Cordillera
Randolph J. Enkin, J. B. Mahoney, J. Baker, M. Kiessling, Ralph Haugerud
2002, Tectonics (21) 18-1-18-18
The Upper Cretaceous Ventura Member of the Goat Wall unit in the southern Methow block of southern British Columbia and northern Washington State holds a syntectonic magnetization. Eight new sites from Manning Park in British Columbia give a mean direction of D = 27.5°, I = 60.1°, k = 304.7, α95 = 3.2° after optimal partial tilt...
No-take marine reserves in central California kelp forests: metrics of human take or the tip of the iceberg?
J. A. Estes, M.J. Paddack
2002, Report
No abstract available at this time...
Report on field activities at Adak and the western Aleutians, 2002
J. A. Estes, R.G. Anthony, Walter M. Jarman, A.K. Miles, James L. Bodkin, M.A. Ricca
2002, Report
No abstract available at this time...
Red-legged Frog Surveys at Horseshoe Pond, Point Reyes National Seashore
Gary M. Fellers, Greg Guscio
2002, Report
No abstract available at this time...
Relationships between boat harbors, fish processing, organic contamination, and Steller's eiders wintering in the Eastern Aleutian Islands and Alaska Peninsula
Paul L. Flint, A.K. Miles
2002, Report
No abstract available at this time...
Fire History of Carlsbad Caverns National Park, New Mexico. Final Report for Carlsbad Caverns National Park
B.S. Gebow, W. L. Halvorson
2002, Report
No abstract available at this time...
Protocols for Drawing Blood from the Brachial Plexus of Desert Tortoises: Instructions for ordering equipment and culture media; summary of how to draw blood and conduct nasal lavages; and information on how to contract for laboratory analysis and ship laboratory samples
K.H. Berry, T. Okamoto
2002, Report
No abstract available at this time...
Very-long-period volcanic earthquakes beneath Mammoth Mountain, California
David P. Hill, P. Dawson, M.J.S. Johnston, A.D. Pitt, G. Biasi, K. Smith
2002, Geophysical Research Letters (29) 8-1-8-4
Detection of three very‐long‐period (VLP) volcanic earthquakes beneath Mammoth Mountain emphasizes that magmatic processes continue to be active beneath this young, eastern California volcano. These VLP earthquakes, which occurred in October 1996 and July and August 2000, appear as bell‐shaped pulses with durations of one to two...
