Earthquake ground-motion prediction equations for eastern North America
G. M. Atkinson, D.M. Boore
2006, Bulletin of the Seismological Society of America (96) 2181-2205
New earthquake ground-motion relations for hard-rock and soil sites in eastern North America (ENA), including estimates of their aleatory uncertainty (variability) have been developed based on a stochastic finite-fault model. The model incorporates new information obtained from ENA seismographic data gathered over the past 10 years, including three-component broadband data...
Biogeochemical characterization of an undisturbed highly acidic, metal-rich bryophyte habitat, east-central Alaska, U.S.A.
L. P. Gough, R. G. Eppinger, Paul H. Briggs, S. Giles
2006, Arctic, Antarctic, and Alpine Research (38) 522-529
We report on the geochemistry of soil and bryophyte-laden sediment and on the biogeochemistry of willows growing in an undisturbed volcanogenic massive sulfide deposit in the Alaska Range ecoregion of east-central Alaska. We also describe an unusual bryophyte assemblage found growing in the acidic metal-rich waters that drain the area....
Seed germination of cirsium arvense and Lepidium latifolium: Implications for management of montane wetlands
M.K. Laubhan, T.L. Shaffer
2006, Wetlands (26) 69-78
Cirsium arvense and Lepidium latifolium are species that can aggressively invade wetland margins and potentially reduce biodiversity and alter ecosystem function. Although expansion of these species primarily occurs via rhizomatous growth, seeds are thought to be important in initial establishment. We conducted this study to investigate differences in seed germination...
Seasonal migration and environmental conditions of Pacific halibut Hippoglossus stenolepis, elucidated from pop-up archival transmitting (PAT) tags
Timothy Loher, Andrew C. Seitz
2006, Marine Ecology Progress Series (317) 259-271
Pop-up archival transmitting (PAT) tags were used to study the fall migration of halibut in the Gulf of Alaska (GOA). We tagged 6 Pacific halibut Hippoglossus stenolepis on summer feeding grounds in the eastern GOA and another 6 in the western GOA from June 13 to August 6, 2002. The...
Home range characteristics of great gray owls in Yosemite National Park, California
Charles van Riper III, Jan W. van Wagtendonk
2006, Journal of Raptor Research (40) 130-141
We studied home range and habitat use of radio-tagged Great Gray Owls (Strix nebulosa) in Yosemite, California. From 1986–90 we made 5338 relocations on nine adult and three juvenile owls. Home-range size was not correlated with number of locations and was significantly different between breeding and nonbreeding periods. Breeding female...
Cladophora (Chlorophyta) spp. harbor human bacterial pathogens in nearshore water of Lake Michigan
S. Ishii, T. Yan, D.A. Shively, M.N. Byappanahalli, R.L. Whitman, M.J. Sadowsky
2006, Applied and Environmental Microbiology (72) 4545-4553
Cladophora glomerata, a macrophytic green alga, is commonly found in the Great Lakes, and significant accumulations occur along shorelines during the summer months. Recently, Cladophora has been shown to harbor high densities of the fecal indicator bacteria Escherichia coli and enterococci. Cladophora may also harbor human pathogens; however, until now, no studies to address this question...
Effects of human recreation on the incubation behavior of American Oystercatchers
C.P. McGowan, T.R. Simons
2006, Wilson Journal of Ornithology (118) 485-493
Human recreational disturbance and its effects on wildlife demographics and behavior is an increasingly important area of research. We monitored the nesting success of American Oystercatchers (Haematopus palliatus) in coastal North Carolina in 2002 and 2003. We also used video monitoring at nests to measure the response of incubating birds...
Abundance and distribution of selected elements in soils, stream sediments, and selected forage plants from desert tortoise habitats in the Mojave and Colorado deserts, USA
M.A. Chaffee, K.H. Berry
2006, Journal of Arid Environments (67) 35-87
A baseline and background chemical survey was conducted in southeastern California, USA, to identify potential sources of toxicants in natural and anthropogenically-altered habitats of the threatened desert tortoise (Gopherus agassizii). Soil, stream sediment, and plant samples were collected from six tortoise habitat study areas in the Mojave and Colorado deserts...
Coulomb stress transfer and tectonic loading preceding the 2002 Denali fault earthquake
Charles G. Bufe
2006, Bulletin of the Seismological Society of America (96) 1662-1674
Pre-2002 tectonic loading and Coulomb stress transfer are modeled along the rupture zone of the M 7.9 Denali fault earthquake (DFE) and on adjacent segments of the right-lateral Denali–Totschunda fault system in central Alaska, using a three-dimensional boundary-element program. The segments modeled closely follow, for about 95°, the arc...
Location and timing of river-aquifer exchanges in six tributaries to the Columbia River in the Pacific Northwest of the United States
C.P. Konrad
2006, Journal of Hydrology (329) 444-470
The flow of water between rivers and contiguous aquifers influences the quantity and quality of water resources, particularly in regions where precipitation and runoff are unevenly distributed through the year, such as the Columbia Basin (CB) in northwestern United States. Investigations of basin hydrogeology and gains and losses of streamflow...
Paleoseismic observations of an onshore transform boundary: The Magallanes-Fagnano fault, Tierra del Fuego, Argentina
C.H. Costa, R. Smalley Jr., David P. Schwartz, Heidi D. Stenner, M. Ellis, E.A. Ahumada, M.S. Velasco
2006, Revista de la Asociacion Geologica Argentina (61) 647-657
We present preliminary information on the geomorphologic features and paleoseismic record associated with the ruptures of two Ms 7.8 earthquakes that struck Tierra del Fuego and the southernmost continental margin of South America on December 17, 1949. The fault scarp was surveyed in several places cast of Lago Fagnano and...
Both msa genes in Renibacterium salmoninarum are needed for full virulence in bacterial kidney disease
A.M. Coady, A.L. Murray, D.G. Elliott, L.D. Rhodes
2006, Applied and Environmental Microbiology (72) 2672-2678
Renibacterium salmoninarum, a gram-positive diplococcobacillus that causes bacterial kidney disease among salmon and trout, has two chromosomal loci encoding the major soluble antigen (msa) gene. Because the MSA protein is widely suspected to be an important virulence factor, we used insertion-duplication mutagenesis to generate disruptions of either the msa1 or...
Ball clay
R.L. Virta
2006, Mining Engineering (58) 19-20
In 2005, four companies including H.C. Spinks Clay, Kentucky-Tennessee Clay, Old Hickory Clay and Unimin mined ball clay in four states. Based on a preliminary survey of the ball clay industry, production reached 1.32 Mt valued at $53.3 million. Tennessee was the leading ball clay producer state with 61% of...
Pleistocene corals of the Florida keys: Architects of imposing reefs - Why?
B. H. Lidz
2006, Journal of Coastal Research (22) 750-759
Five asymmetrical, discontinuous, stratigraphically successive Pleistocene reef tracts rim the windward platform margin off the Florida Keys. Built of large head corals, the reefs are imposing in relief (???30 m high by 1 km wide), as measured from seismic profiles. Well dated to marine oxygen isotope substages 5c, 5b, and...
The allometric relationship between resting metabolic rate and body mass in wild waterfowl (Anatidae) and an application to estimation of winter habitat requirements
M. R. Miller, J. McA Eadie
2006, Condor (108) 166-177
Breeding densities and migration periods of Common Snipe in Colorado were investigated in 1974-75. Sites studied were near Fort Collins and in North Park, both in north central Colorado; in the Yampa Valley in northwestern Colorado; and in the San Luis Valley in south central Colorado....Estimated densities of breeding snipe...
Reproductive and early life stages pathology - Histopathology workshop report
D.W. Bruno, B. Nowak, Diane G. Elliott
2006, Bulletin of the European Association of Fish Pathologists (26) 55-56
Pathology occurring during reproduction and larval development represents an important part of the life cycle of fish, and the diseases that affect eggs and larvae often result in significant losses. However, mortality during this period is frequently ignored or poorly researched as the temptation is to replace the losses rather...
Nest survival of clay-colored and vesper sparrows in relation to woodland edge in mixed-grass prairies
T.A. Grant, E.M. Madden, T.L. Shaffer, P.J. Pietz, G.B. Berkey, N.J. Kadrmas
2006, Journal of Wildlife Management (70) 691-701
The quantity and quality of northern mixed-grass prairie continues to decline because of conversion to agriculture, invasion of woody and exotic plants, and disruption of important ecological processes that shape grasslands. Declines in grassland bird populations in North Dakota, USA, have coincided with these largely anthropogenic alterations to prairie habitat....
A structural equation model analysis of postfire plant diversity in California shrublands
J.B. Grace, Jon E. Keeley
2006, Ecological Applications (16) 503-514
This study investigates patterns of plant diversity following wildfires in fire‐prone shrublands of California, seeks to understand those patterns in terms of both local and landscape factors, and considers the implications for fire management. Ninety study sites were established following extensive wildfires in 1993, and 1000‐m2 plots were used to sample...
Upstream migration of two pre-spawning shortnose sturgeon passed upstream of Pinopolis Dam, Cooper River, South Carolina
S.T. Finney, J. Jeffery Isely, D.W. Cooke
2006, Southeastern Naturalist (5) 369-375
Two shortnose sturgeon were artificially passed above the Pinopolis Lock and Dam into the Santee-Cooper Lakes in order to simulate the use of a fish-passage mechanism. Movement patterns and spawning behavior were studied to determine the potential success of future shortnose sturgeon migrations if and when a fish-migration bypass structure...
Summer food habits and trophic overlap of roundtail chub and creek chub in Muddy Creek, Wyoming
M.C. Quist, M.R. Bower, W.A. Hubert
2006, Southwestern Naturalist (51) 22-27
Native fishes of the Upper Colorado River Basin have experienced substantial declines in abundance and distribution, and are extirpated from most of Wyoming. Muddy Creek, in south-central Wyoming (Little Snake River watershed), contains sympatric populations of native roundtail chub (Gila robusta), bluehead sucker, (Catostomus discobolus), and flannelmouth sucker (C. tatipinnis),...
Foraging destinations and marine habitat use of short-tailed albatrosses: A multi-scale approach using first-passage time analysis
R.M. Suryan, F. Sato, G.R. Balogh, Hyrenbach K. David, P.R. Sievert, K. Ozaki
2006, Deep-Sea Research Part II: Topical Studies in Oceanography (53) 370-386
We used satellite telemetry, remotely sensed data (bathymetry, chlorophyll a (chl a), sea-surface temperature (SST), wind speed) and first-passage time (FPT) analysis to determine the distribution, movement patterns, and habitat associations of short-tailed albatrosses (Phoebastria albatrus) during the non-breeding season, 2002 and 2003. Satellite transmitters were deployed on birds immediately...
Differential response in chick survival to diet in least and crested auklets
Adrian E. Gall, D.D. Roby, D.B. Irons, I.C. Rose
2006, Marine Ecology Progress Series (308) 279-291
Least auklets Aethia pusilla and crested auklets A. cristatella are abundant planktivorous seabirds found throughout the Bering Sea and are inextricably linked to the secondary productivity of this northern marine ecosystem. We assessed the relationship between productivity and diet in least and crested auklets by examining breeding chronology, daily survival...
Sediment and nutrient accumulation within lowland bottomland ecosystems: An example from the Atchafalaya River Basin, Louisiana
C.R. Hupp, G.B. Noe
2006, Conference Paper, Hydrology and Management of Forested Wetlands - Proceeding of the International Conference
Sediment and nutrient deposition, storage, and transformations are important environmental functions of riverine forested wetland ecosystems, yet documentation and interpretation of sedimentation/nutrient processes remain incomplete. Our studies located in the Coastal Plain of southeastern USA, including the Atchafalaya Basin, La. (a distributary of the Mississippi River) serve as example for...
Estimation of pseudo-2D shear-velocity section by inversion of high frequency surface waves
Y. Luo, J. Liu, J. Xia, Y. Xu, Q. Liu
2006, SEG Technical Program Expanded Abstracts (25) 1510-1514
A scheme to generate pseudo-2D shear-velocity sections with high horizontal resolution and low field cost by inversion of high frequency surface waves is presented. It contains six steps. The key step is the joint method of crossed correlation and phase shift scanning. This joint method chooses only two traces to...
Negative correlation between porosity and hydraulic conductivity in sand-and-gravel aquifers at Cape Cod, Massachusetts, USA
R. H. Morin
2006, Journal of Hydrology (316) 43-52
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