Age and growth of the knobbed whelk Busycon carica (Gmelin 1791) in South Carolina subtidal waters
A.G. Eversole, W.D. Anderson, J. Jeffery Isely
2008, Journal of Shellfish Research (27) 423-426
Knobbed whelk, Busycon carica (Gmelin, 1791), age and growth were estimated using tagged and recaptured individuals (n = 396) from areas off South Carolina coastal islands. Recaptured whelks were at large an average of 298 d (4-2,640 d). Growth, an increase in shell length (SL), was evident in 24% of...
Association among active seafloor deformation, mound formation, and gas hydrate growth and accumulation within the seafloor of the Santa Monica Basin, offshore California
C. K. Paull, W. R. Normark, W. Ussler III, D.W. Caress, R. Keaten
2008, Marine Geology (250) 258-275
Seafloor blister-like mounds, methane migration and gas hydrate formation were investigated through detailed seafloor surveys in Santa Monica Basin, offshore of Los Angeles, California. Two distinct deep-water (??? 800??m water depth) topographic mounds were surveyed using an autonomous underwater vehicle (carrying a multibeam sonar and a chirp sub-bottom profiler) and...
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...
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...
Near-surface location, geometry, and velocities of the Santa Monica Fault Zone, Los Angeles, California
R. D. Catchings, G. Gandhok, M. R. Goldman, D. Okaya, M. J. Rymer, G.W. Bawden
2008, Bulletin of the Seismological Society of America (98) 124-138
High-resolution seismic-reflection and seismic-refraction imaging, combined with existing borehole, earthquake, and paleoseismic trenching data, suggest that the Santa Monica fault zone in Los Angeles consists of multiple strands from several kilometers depth to the near surface. We interpret our seismic data as showing two shallow-depth low-angle fault strands and multiple...
A low intensity sampling method for assessing blue crab abundance at Aransas National Wildlife Refuge and preliminary results on the relationship of blue crab abundance to whooping crane winter mortality
Bruce H. Pugesek, Michael J. Baldwin, Thomas Stehn
Martin J. Folk, Stephen A. Nesbitt, editor(s)
2008, Conference Paper, Proceedings of the tenth North American crane workshop
We sampled blue crabs (Callinectes sapidus) in marshes on the Aransas National Wildlife Refuge, Texas from 1997 to 2005 to determine whether whooping crane (Grus americana) mortality was related to the availability of this food source. For four years, 1997 - 2001, we sampled monthly from the fall through the...
The April 18, 2008 Illinois earthquake: an ANSS monitoring success
Robert B. Herrmann, M. Withers, H. Benz
2008, Seismological Research Letters (79) 830-843
The largest-magnitude earthquake in the past 20 years struck near Mt. Carmel in southeastern Illinois on Friday morning, 18 April 2008 at 09:36:59 UTC (04:37 CDT). The Mw 5.2 earthquake was felt over an area that spanned Chicago and Atlanta, with about 40,000 reports submitted to the U.S. Geological Survey...
Pollen evidence for late pleistocene bering land bridge environments from Norton Sound, Northeastern Bering Sea, Alaska
T. A. Ager, R. L. Phillips
2008, Arctic, Antarctic, and Alpine Research (40) 451-461
After more than half a century of paleoenvironmental investigations, disagreements persist as to the nature of vegetation type and climate of the Bering land bridge (BLB) during the late Wisconsin (Sartan) glacial interval. Few data exist from sites on the former land bridge, now submerged under the Bering and Chukchi...
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...
Fish Rhabdoviruses
Gael Kurath, J. Winton
2008, Book chapter, Encyclopedia of Virology
Many important viral pathogens of fish are members of the family Rhabdoviridae. The viruses in this large group cause significant losses in populations of wild fish as well as among fish reared in aquaculture. Fish rhabdoviruses often have a wide host and geographic range, and infect aquatic animals in both freshwater...
Age-class structure and variability of two populations of the bluemask darter etheostoma (Doration) sp.
J.W. Simmons, James B. Layzer, D.D. Smith
2008, American Midland Naturalist (160) 300-309
The bluemask darter Etheostoma (Doration) sp. is an endangered fish endemic to the upper Caney Fork system in the Cumberland River drainage in central Tennessee. Darters (Etheostoma spp.) are typically short-lived and exhibit rapid growth that quickly decreases with age. Consequently, estimating age of darters from length-frequency distributions can be...
Compound-specific stable isotopes of organic compounds from lake sediments track recent environmental changes in an alpine ecosystem, Rocky Mountain National Park, Colorado
S.K. Enders, M. Pagani, S. Pantoja, Jill Baron, A.P. Wolfe, N. Pedentchouk, L. Nunez
2008, Limnology and Oceanography (53) 1468-1478
Compound-specific nitrogen, carbon, and hydrogen isotope records from sediments of Sky Pond, an alpine lake in Rocky Mountain National Park (Colorado, United States of America), were used to evaluate factors contributing to changes in diatom assemblages and bulk organic nitrogen isotope records identified in lake sediments across Colorado, Wyoming, and...
Environmental occurrence and shallow ground water detection of the antibiotic monensin from dairy farms
N. Watanabe, T.H. Harter, B.A. Bergamaschi
2008, Conference Paper, Journal of Environmental Quality
Pharmaceuticals used in animal feeding operations have been detected in various environmental settings. There is a growing concern about the impact on terrestrial and aquatic organisms and the development of antibiotic-resistant strains of microorganisms. Pharmaceutical use in milking cows is relatively limited compared with other livestock operations, except for the...
Semantic mediation in the national geologic map database (US)
D. Percy, S. Richard, D. Soller
2008, Conference Paper, AAAI Spring Symposium - Technical Report
Controlled language is the primary challenge in merging heterogeneous databases of geologic information. Each agency or organization produces databases with different schema, and different terminology for describing the objects within. In order to make some progress toward merging these databases using current technology, we have developed software and a workflow...
Development of landsat-5 thematic mapper internal calibrator gain and offset table
J. A. Barsi, G. Chander, E. Micijevic, B. L. Markham, Md. O. Haque
2008, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
The National Landsat Archive Production System (NLAPS) has been the primary processing system for Landsat data since U.S. Geological Survey (USGS) Earth Resources Observation and Science Center (EROS) started archiving Landsat data. NLAPS converts raw satellite data into radiometrically and geometrically calibrated products. NLAPS has historically used the Internal Calibrator...
The biological soil crusts of the San Nicolas Island: Enigmatic algae from a geographically isolated ecosystem
V.R. Flechtner, J.R. Johansen, J. Belnap
2008, Western North American Naturalist (68) 405-436
Composite soil samples from 7 sites on San Nicolas Island were evaluated quantitatively and qualitatively for the presence of cyanobacteria and eukaryotic microalgae. Combined data demonstrated a rich algal flora with 19 cyanobacterial and 19 eukaryotic microalgal genera being identified, for a total of 56 species. Nine new species were...
Trace element emissions from spontaneous combustion of gob piles in coal mines, Shanxi, China
Y. Zhao, Jiahua Zhang, C. L. Chou, Y. Li, Z. Wang, Y. Ge, C. Zheng
2008, International Journal of Coal Geology (73) 52-62
The emissions of potentially hazardous trace elements from spontaneous combustion of gob piles from coal mining in Shanxi Province, China, have been studied. More than ninety samples of solid waste from gob piles in Shanxi were collected and the contents of twenty potentially hazardous trace elements (Be, F, V, Cr,...
An exact solution for ideal dam-break floods on steep slopes
C. Ancey, Richard M. Iverson, M. Rentschler, Roger P. Denlinger
2008, Water Resources Research (44)
The shallow‐water equations are used to model the flow resulting from the sudden release of a finite volume of frictionless, incompressible fluid down a uniform slope of arbitrary inclination. The hodograph transformation and Riemann's method make it possible to transform the governing equations into a linear system and then deduce...
Invertebrate community response to a shifting mosaic of habitat
David M. Engle, S.D. Fuhlendorf, A. Roper, David M. Leslie Jr.
2008, Rangeland Ecology and Management (61) 55-62
Grazing management has focused largely on promoting vegetation homogeneity through uniform distribution of grazing to minimize area in a pasture that is either heavily disturbed or undisturbed. An alternative management model that couples grazing and fire (i.e., patch burning) to promote heterogeneity argues that grazing and fire interact through a...
Flood trends and river engineering on the Mississippi River system
N. Pinter, A.A. Jemberie, J.W.F. Remo, R.A. Heine, B.S. Ickes
2008, Geophysical Research Letters (35)
Along >4000 km of the Mississippi River system, we document that climate, land-use change, and river engineering have contributed to statistically significant increases in flooding over the past 100-150 years. Trends were tested using a database of >8 million hydrological measurements. A geospatial database of historical engineering construction was used...
Broadband simulations for Mw 7.8 southern san andreas earthquakes: Ground motion sensitivity to rupture speed
R.W. Graves, Brad T. Aagaard, K.W. Hudnut, L.M. Star, J.P. Stewart, T.H. Jordan
2008, Geophysical Research Letters (35)
Using the high-performance computing resources of the Southern California Earthquake Center, we simulate broadband (0-10 Hz) ground motions for three Mw 7.8 rupture scenarios of the southern San Andreas fault. The scenarios incorporate a kinematic rupture description with the average rupture speed along the large slip portions of the fault...
Western juniper and ponderosa pine ecotonal climate-growth relationships across landscape gradients in southern Oregon
K.C. Knutson, D.A. Pyke
2008, Canadian Journal of Forest Research (38) 3021-3032
Forecasts of climate change for the Pacific northwestern United States predict warmer temperatures, increased winter precipitation, and drier summers. Prediction of forest growth responses to these climate fluctuations requires identification of climatic variables limiting tree growth, particularly at limits of free species distributions. We addressed this problem at the pine-woodland...
Long-term changes in the phosphorus loading to and trophic state of the Salton Sea, California
Dale M. Robertson, S.G. Schladow, G.C. Holdren
2008, Hydrobiologia (604) 21-36
The Salton Sea (Sea) is a eutrophic to hypereutrophic lake characterized by high nutrient concentrations, low water clarity, and high biological productivity. Based on dissolved phosphorus (P) and nitrogen (N) concentrations and N:P ratios, P is typically the limiting nutrient in the Sea and, therefore, should be the primary nutrient...
Summer E. coli patterns and responses along 23 Chicago beaches
R.L. Whitman, M.B. Nevers
2008, Environmental Science & Technology (42) 9217-9224
Concentrations of E. coli in recreational beach water are highly variable both locally and temporally, but a broader understanding of these fluctuations may be explained through coastal observations. Currently, beach contamination study approaches tend to be site-specific underthe belief that politically delineated beaches are unique and management of beaches cannot...
U.S. federal water quality web service collaboration
J. Scott, D. Gellenbeck, D. Young, N. Booth
2008, Eos, Transactions, American Geophysical Union (89) 543-544
[No abstract available]...
