Oxygen isotope geochemistry of the lassen volcanic center, California: Resolving crustal and mantle contributions to continental Arc magmatism
T.C. Feeley, M.A. Clynne, G.S. Winer, W.C. Grice
2008, Journal of Petrology (49) 971-997
This study reports oxygen isotope ratios determined by laser fluorination of mineral separates (mainly plagioclase) from basaltic andesitic to rhyolitic composition volcanic rocks erupted from the Lassen Volcanic Center (LVC), northern California. Plagioclase separates from nearly all rocks have δ18O values (6·1–8·4‰) higher than expected for production of the magmas...
Net trophic transfer efficiencies of polychlorinated biphenyl congeners to lake whitefish (Coregonus clupeaformis) from their food
C.P. Madenjian, D.V. O’Connor, R.R. Rediske, J. P. O’Keefe, S.A. Pothoven
2008, Environmental Toxicology and Chemistry (27) 631-636
Lake whitefish (Coregonus clupeaformis) were fed rainbow smelt (Osmerus mordax) in four laboratory tanks over a 133-d experiment. At the start of the experiment, 10 to 14 of the fish in each tank were sacrificed, and the concentrations of 40 polychlorinated biphenyl (PCB) congeners within these fish were determined. Polychlorinated...
Habitat use and movement patterns by adult saugers from fall to summer in an unimpounded small-river system
K.M. Kuhn, W.A. Hubert, Kevin Johnson, D. Oberlie, D. Dufek
2008, North American Journal of Fisheries Management (28) 360-367
The Little Wind River drainage in Wyoming is a relatively small unimpounded river system inhabited by native saugers Sander canadensis. Radio telemetry was used to assess habitat use and movement patterns by adult saugers in the river system from fall through early summer. Fifty-four adult saugers were captured during fall...
Stratigraphy and structural setting of Upper Cretaceous Frontier Formation, western Centennial Mountains, southwestern Montana and southeastern Idaho
T. S. Dyman, R. G. Tysdal, W. J. Perry Jr., D. J. Nichols, J. D. Obradovich
2008, Cretaceous Research (29) 237-248
Stratigraphic, sedimentologic, and palynologic data were used to correlate the Frontier Formation of the western Centennial Mountains with time-equivalent rocks in the Lima Peaks area and other nearby areas in southwestern Montana. The stratigraphic interval studied is in the middle and upper parts (but not uppermost) of the formation based...
Summer temperature variation and implications for juvenile Atlantic salmon
M. E. Mather, D.L. Parrish, C.A. Campbell, J.R. McMenemy, Joseph M. Smith
2008, Hydrobiologia (603) 183-196
Temperature is important to fish in determining their geographic distribution. For cool- and cold-water fish, thermal regimes are especially critical at the southern end of a species' range. Although temperature is an easy variable to measure, biological interpretation is difficult. Thus, how to determine what temperatures are meaningful to fish...
Effects of seawater acclimation on mRNA levels of corticosteroid receptor genes in osmoregulatory and immune systems in trout
T. Yada, S. Hyodo, C.B. Schreck
2008, General and Comparative Endocrinology (156) 622-627
Influence of environmental salinity on expression of distinct corticosteroid receptor (CR) genes, glucocorticoid receptor (GR)-1 and -2, and mineralcorticoid receptor (MR), was examined in osmoregulatory and hemopoietic organs and leucocytes of steelhead trout (Oncorhynchus mykiss). There was no significant difference in plasma cortisol levels between freshwater (FW)- or seawater (SW)-acclimated...
Early marine growth of pink salmon in Prince William Sound and the coastal gulf of Alaska during years of low and high survival
A.D. Cross, D.A. Beauchamp, K.W. Myers, J.H. Moss
2008, Transactions of the American Fisheries Society (137) 927-939
Although early marine growth has repeatedly been correlated with overall survival in Pacific salmon Oncorhynchus spp., we currently lack a mechanistic understanding of smolt-to-adult survival. Smolt-to-adult survival of pink salmon O. gorbuscha returning to Prince William Sound was lower than average for juveniles that entered marine waters in 2001 and...
Upper conduit structure and explosion dynamics at Stromboli
Bernard A. Chouet, Phillip B. Dawson, Marcello Martini
Sonia Calvari, Salvatore Inguaggiato, Giuseppe Puglisi, Maurizio Ripepe, Mauro Rosi, editor(s)
2008, Book chapter, The Stromboli volcano: An integrated study of the 2002-2003 eruption
Modeling of very long period seismic data recorded during explosive activity at Stromboli in 1997 provides an image of the uppermost 1 km of its volcanic plumbing system. Two distinct dike-like conduit structures are identified, each representative of explosive eruptions from two different vents located near the northern and southern...
Boulder Creek: A stream ecosystem in an urban landscape
Philip L. Verplanck, Sheila F. Murphy, Peter W. Birkeland, Pitlick John, Larry B. Barber, Travis S. Schmidt
Robert G.H. Raynolds, editor(s)
2008, Book chapter, Roaming the Rocky Mountains and environs: Geological field trips
The Boulder Creek Watershed, within the Front Range region of Colorado, is typical of many western watersheds because it is composed of a high-gradient upper reach mostly fed by snowmelt, a substantial change in gradient at the range front, and an urban corridor within the lower gradient section. A stream...
Ecology of coral reefs in the US Virgin Islands
Caroline S. Rogers, Jeff Miller, Erinn Muller, Peter J Edmunds, Richard S. Nemeth, James P. Beets, Alan M. Friedlander, Tyler B. Smith, Rafe Boulon, Christopher F.G. Jeffrey, Charles Menza, Chris Caldow, Nasseer Idrisi, Barbara Kojis, Mark E. Monaco, Anthony S. Spitzack, Elizabeth H. Gladfelter, John C. Ogden, Zandy M Hillis-Star, Ian Lundgren, William B. Schill, Ilsa B. Kuffner, Laurie L. Richardson, Barry E. Devine, Joshua D. Voss
Bernhard Riegl, Richard E. Dodge, editor(s)
2008, Book chapter, Coral reefs in the US Virgin Islands
The US Virgin Islands (USVI ) in the northeastern Caribbean, consist of St. Croix (207 km2), St. Thomas (83 km2), St. John (52 km2) and numerous smaller islands (Dammann and Nellis 1992). They are part of the Lesser Antilles and Leeward Islands on the eastern boundary of the Caribbean plate...
Dike orientations in the late jurassic independence dike swarm and implications for vertical-axis tectonic rotations in eastern California
R.F. Hopson, John W. Hillhouse, K. A. Howard
2008, Special Paper of the Geological Society of America 481-498
Analysis of the strikes of 3841 dikes in 47 domains in the 500-km-long Late Jurassic Independence dike swarm indicates a distribution that is skewed clockwise from the dominant northwest strike. Independence dike swarm azimuths tend to cluster near 325?? ?? 30??, consistent with initial subparallel intrusion along much of the...
Nesting biology of Lesser Canada Geese, Branta canadensis parvipes, along the Tanana River, Alaska
Craig R. Ely, John M. Pearce, Roger W. Ruess
2008, Canadian Field-Naturalist (122) 29-33
Lesser Canada Geese (Branta canadensis parvipes) are widespread throughout interior regions of Alaska and Canada, yet there have been no published studies documenting basic aspects of their nesting biology. We conducted a study to determine reproductive parameters of Lesser Canada Geese nesting along the Tanana River near the city of...
It's the land use not the fuels: fires and land development in southern California
Stephanie Pincetl, Philip W. Rundel, Julie Clark De Blasio, Dan Silver, Tom Scott, Jon E. Keeley, Richard W. Halsey
2008, Real Estate Review (37) 25-42
No abstract available....
Devonian brachiopods of southwesternmost laurentia: Biogeographic affinities and tectonic significance
A. J. Boucot, Forrest G. Poole, R. Amaya-Martinez, A. G. Harris, Charles Sandberg, William R. Page
2008, Special Paper of the Geological Society of America 77-97
Three brachiopod faunas discussed herein record different depositional and tectonic settings along the southwestern margin of Laurentia (North America) during Devonian time. Depositional settings include inner continental shelf (Cerros de Los Murcielagos), medial continental shelf (Rancho Placeritos), and offshelf continental rise (Rancho Los Chinos). Ages of Devonian brachiopod faunas include...
Alaska's Pavlof volcano ends 11-year repose
Christopher F. Waythomas, Stephanie Prejean, Stephen R. McNutt
2008, Eos, Transactions, American Geophysical Union (89) 209-211
After an 11‐year period of repose, Pavlof volcano on the Alaska Peninsula (Figure 1) began an episode of Strombolian eruption lasting 31 days, from 14 August to 13 September 2007.The eruption began abruptly on 14 August after a minor increase in seismicity the previous day. Nearly continuous lava fountaining, explosions,...
Sensitivity of wetland saturated hydraulic heads and water budgets to evapotranspiration
W.B. Shoemaker, S. Huddleston, C.L. Boudreau, A. M. O’Reilly
2008, Wetlands (28) 1040-1047
The sensitivity of wetland saturated hydraulic heads and water budgets to evapotranspiration (ET) was examined using a simplified hydrologic model and eight representations of ET. Estimates of ET that created the most reliable wetland saturated hydraulic heads and water budgets employed vegetation coefficients to correct potential ET, calculated by the...
Diet and foraging of Rana sauteri and Bufo bankorensis tadpoles in subtropical Taiwanese streams
Hong-Chuan Chen, Bo-Chi Lai, Gary M. Fellers, Wei-Lung Wang, Yeong-Choy Kam
2008, Zoological Studies (47) 685-696
No abstract available....
Reducing sedimentation of depressional wetlands in agricultural landscapes
S. K. Skagen, Cynthia Melcher, D.A. Haukos
2008, Wetlands (28) 594-604
Depressional wetlands in agricultural landscapes are easily degraded by sediments and contaminants accumulated from their watersheds. Several best management practices can reduce transport of sediments into wetlands, including the establishment of vegetative buffers. We summarize the sources, transport dynamics, and effect of sediments, nutrients, and contaminants that threaten wetlands and...
The importance of hydrology in restoration of bottomland hardwood wetland functions
R.G. Hunter, S.P. Faulkner, K.A. Gibson
2008, Wetlands (28) 605-615
Bottomland hardwood (BLH) forests have important biogeochemical functions and it is well known that certain structural components, including pulsed hydrology, hydric soils, and hydrophytic vegetation, enhance these functions. It is unclear, however, how functions of restored BLH wetlands compare to mature, undisturbed wetlands. We measured a suite of structural and...
Stream denitrification across biomes and its response to anthropogenic nitrate loading
P. J. Mulholland, A. M. Helton, G. C. Poole, R. O. Hall Jr., S. K. Hamilton, B. J. Peterson, J. L. Tank, L. R. Ashkenas, L. W. Cooper, Clifford N. Dahm, W. K. Dodds, S.E.G. Findlay, S.V. Gregory, N. B. Grimm, S. L. Johnson, W. H. McDowell, J.L. Meyer, H. M. Valett, J.R. Webster, C. P. Arango, J. J. Beaulieu, M. J. Bernot, A. J. Burgin, C. L. Crenshaw, L. T. Johnson, B.R. Niederlehner, J. M. O’Brien, J. D. Potter, R.W. Sheibley, D. J. Sobota, S. M. Thomas
2008, Nature (452) 202-205
Anthropogenic addition of bioavailable nitrogen to the biosphere is increasing and terrestrial ecosystems are becoming increasingly nitrogen-saturated, causing more bioavailable nitrogen to enter groundwater and surface waters. Large-scale nitrogen budgets show that an average of about 20-25 per cent of the nitrogen added to the biosphere is exported from rivers...
Cliff swallows Petrochelidon pyrrhonota as bioindicators of environmental mercury, Cache Creek Watershed, California
Roger L. Hothem, Bonnie S. Trejo, Marissa L. Bauer, John J. Crayon
2008, Archives of Environmental Contamination and Toxicology (55) 111-121
To evaluate mercury (Hg) and other element exposure in cliff swallows (Petrochelidon pyrrhonota), eggs were collected from 16 sites within the mining-impacted Cache Creek watershed, Colusa, Lake, and Yolo counties, California, USA, in 1997-1998. Nestlings were collected from seven sites in 1998. Geometric mean total Hg (THg) concentrations ranged from...
Ichthyoplankton assemblages of coastal west-central Lake Erie and associated habitat characteristics
J.E. McKenna Jr., R. Douglas Hunter, M.C. Fabrizio, J.F. Savino, T. N. Todd, M. Bur
2008, Journal of Great Lakes Research (34) 755-769
Early life stage survival often determines fish cohort strength and that survival is affected by habitat conditions. The structure and dynamics of ichthyoplankton assemblages can tell us much about biodiversity and fish population dynamics, but are poorly understood in nearshore areas of the Great Lakes, where most spawning and nursery...
Metalliferous sediment and a silica-hematite deposit within the Blanco fracture zone, Northeast Pacific
J.R. Hein, D.A. Clague, R.A. Koski, R.W. Embley, R.E. Dunham
2008, Marine Georesources and Geotechnology (26) 317-339
A Tiburon ROV dive within the East Blanco Depression (EBD) increased the mapped extent of a known hydrothermal field by an order of magnitude. In addition, a unique opal-CT (cristobalite-tridymite)-hematite mound was discovered, and mineralized sediments and rock were collected and analyzed. Silica-hematite mounds have not previously been found on...
Dissolved and labile concentrations of Cd, Cu, Pb, and Zn in the South Fork Coeur d'Alene River, Idaho: Comparisons among chemical equilibrium models and implications for biotic ligand models
Laurie S. Balistrieri, R.G. Blank
2008, Applied Geochemistry (23) 3355-3371
In order to evaluate thermodynamic speciation calculations inherent in biotic ligand models, the speciation of dissolved Cd, Cu, Pb, and Zn in aquatic systems influenced by historical mining activities is examined using equilibrium computer models and the diffusive gradients in thin films...
Molecular and phenotypic diversity in Chionactis occipitalis (Western Shovel-nosed Snake), with emphasis on the status of C. o. klauberi (Tucson Shovel-nosed Snake).
D.A. Wood, J.M. Meik, A.T. Holycross, Robert N. Fisher, Amy G. Vandergast
2008, Conservation Genetics (9) 1489-1507
Chionactis occipitalis (Western Shovel-nosed Snake) is a small colubrid snake inhabiting the arid regions of the Mojave, Sonoran, and Colorado deserts. Morphological assessments of taxonomy currently recognize four subspecies. However, these taxonomic proposals were largely based on weak morphological differentiation and inadequate geographic sampling. Our goal was to explore evolutionary...
