Incidence of the enterococcal surface protein (esp) gene in human and animal fecal sources
R.L. Whitman, K. Przybyla-Kelly, D.A. Shively, M.N. Byappanahalli
2007, Environmental Science & Technology (41) 6090-6095
The occurrence of the enterococcal surface protein (esp) gene in the opportunistic pathogens Enterococcus faecalis and E. faecium is well-documented in clinical research. Recently, the esp gene has been proposed as a marker of human pollution in environmental waters; however, information on its relative incidence in various human and animal...
Stability and uncertainty of finite-fault slip inversions: Application to the 2004 Parkfield, California, earthquake
S. Hartzell, P. Liu, C. Mendoza, C. Ji, K.M. Larson
2007, Bulletin of the Seismological Society of America (97) 1911-1934
The 2004 Parkfield, California, earthquake is used to investigate stability and uncertainty aspects of the finite-fault slip inversion problem with different a priori model assumptions. We utilize records from 54 strong ground motion stations and 13 continuous, 1-Hz sampled, geodetic instruments. Two inversion procedures are compared: a linear least-squares subfault-based...
Economic decision making and the application of nonparametric prediction models
Emil D. Attanasi, Timothy C. Coburn, Philip A. Freeman
2007, Conference Paper, SPE Hydrocarbon Economics and Evaluation Symposium
Sustained increases in energy prices have focused attention on gas resources in low permeability shale or in coals that were previously considered economically marginal. Daily well deliverability is often relatively small, although the estimates of the total volumes of recoverable resources in these settings are large. Planning and development decisions...
Palaeolimnological evidence of late-Holocene settlement and abandonment in the Mirador Basin, Peten, Guatemala
D. Wahl, R. Byrne, T. Schreiner, R. Hansen
2007, Holocene (17) 813-820
Pollen, loss on ignition and magnetic susceptibility analyses provide a high-resolution palaeoenvironmental record from Lago Puerto Arturo, Peten, Guatemala. The presence of Zea pollen ~2650 BC provides a latest date for the arrival of maize agriculture to the region. The following 3600 years are marked by significant opening of...
New 40Ar/39Ar age determinations and paleomagnetic results bearing on the tectonic and magmatic history of the northern Madison Range and Madison Valley region, southwestern Montana, U.S.A
K.S. Kellogg, S. S. Harlan
2007, Rocky Mountain Geology (42) 157-174
Detailed 40Ar/39Ar dating and paleomagnetic analysis of dacite porphyry sills and dikes that intrude Cretaceous sedimentary rocks in the northern Madison Range in southwestern Montana show that Laramide shortening was essentially complete by ???69 Ma. A negative paleomagnetic fold test indicates that Laramide folding occurred before cooling of the dacite...
Thermal criteria for early life stage development of the winged mapleleaf mussel (Quadrilla fragosa)
M.T. Steingraeber, M.R. Bartsch, J.E. Kalas, T.J. Newton
2007, American Midland Naturalist (157) 297-311
The winged mapleleaf mussel [Quadrula fragosa (Conrad)] is a Federal endangered species. Controlled propagation to aid in recovering this species has been delayed because host fishes for its parasitic glochidia (larvae) are unknown. This study identified blue catfish [Ictaluris furcatus (Lesueur)] and confirmed channel catfish [Ictaluris punctatus (Rafinesque)] as suitable...
Egg thiamine status of Lake Ontario salmonines 1995-2004 with emphasis on lake trout
J.D. Fitzsimons, B. Williston, G. Williston, L. Brown, A. El-Shaarawi, L. Vandenbyllaardt, D. Honeyfeld, D. Tillitt, M. Wolgamood, S.B. Brown
2007, Journal of Great Lakes Research (33) 93-103
Alewives (Alosa pseudoharengus), the major prey fish for Lake Ontario, contain thiaminase. They are associated with development of a thiamine deficiency in salmonines which greatly increases the potential for developing an early mortality syndrome (EMS). To assess the possible effects of thiamine deficiency on salmonine reproduction we measured egg thiamine...
Altered mangrove wetlands as habitat for estuarine nekton: are dredged channels and tidal creeks equivalent?
Justin M. Krebs, Adam B. Brame, Carole C. McIvor
2007, Bulletin of Marine Science (80) 839-861
Hasty decisions are often made regarding the restoration of "altered" habitats, when in fact the ecological value of these habitats may be comparable to natural ones. To assess the "value" of altered mangrove-lined habitats for nekton, we sampled for 1 yr within three Tampa Bay wetlands. Species composition, abundance, and...
Breeding biology of passerines in a subtropical montane forest in northwestern Argentina
S.K. Auer, R.D. Bassar, J.J. Fontaine, T. E. Martin
2007, Condor (109) 321-333
The breeding ecology of south temperate bird species is less widely known than that of north temperate species, yet because they comprise a large portion of the world's avian diversity, knowledge of their breeding ecology can contribute to a more comprehensive understanding of the geographic diversity of avian reproductive traits...
An assessment of ichthyofaunal assemblages within the mangal of the Belize offshore cays
D.S. Taylor, E.A. Reyier, C.C. McIvor, W.P. Davis
2007, Bulletin of Marine Science (80) 721-737
We assessed ichthyofaunal diversity within offshore mangrove cays in Belize during three, 2-wk surveys (2003, 2004, 2005). Nine sampling gears were deployed in pre-defined micro-habitats: fringe, transition, dwarf red mangrove, internal creeks, ponds, and sinkholes. Water quality data (temperature, salinity, DO) were taken during most collections. A total of 2586...
Simple predictions of maximum transport rate in unsaturated soil and rock
John R. Nimmo
2007, Water Resources Research (43)
In contrast with the extreme variability expected for water and contaminant fluxes in the unsaturated zone, evidence from 64 field tests of preferential flow indicates that the maximum transport speed Vmax, adjusted for episodicity of infiltration, deviates little from a geometric mean of 13 m/d. A model based on constant‐speed travel...
Development of the California Current during the past 12,000 yr based on diatoms and silicoflagellates
John A. Barron, David Bukry
2007, Palaeogeography, Palaeoclimatology, Palaeoecology (248) 313-338
Detailed diatom and silicoflagellates records in three cores from the offshore region of southern Oregon to central California reveal the evolution of the northern part of the California Current during the past 12,000 yr. The early Holocene, prior to ∼ 9 ka, was characterized by relatively warm sea surface temperatures (SST), owing to...
Evidence for prosauropod dinosaur gastroliths in the Bull Run Formation (Upper Triassic, Norian) of Virginia
Robert E. Weems, Michelle J. Culp, Oliver Wings
2007, Ichnos: An International Journal for Plant and Animal Traces (14) 271-295
Definitive criteria for distinguishing gastroliths from sedimentary clasts are lacking for many depositional settings, and many reported occurrences of gastroliths either cannot be verified or have been refuted. We discuss four occurrences of gastrolith-like stones (category 6 exoliths) not found within skeletal remains from the Upper Triassic Bull Run Formation...
Annual precipitation in the Yellowstone National Park region since AD 1173
S.T. Gray, L.J. Graumlich, J.L. Betancourt
2007, Quaternary Research (68) 18-27
Cores and cross sections from 133 limber pine (Pinus flexilis James) and Douglas fir (Pseudotsuga menziesii (Mirbel) Franco) at four sites were used to estimate annual (July to June) precipitation in the Yellowstone National Park region for the period from AD 1173 to 1998. Examination of the long-term record shows...
Experimental analysis of the auditory detection process on avian point counts
T.R. Simons, M.W. Alldredge, K. H. Pollock, J.M. Wettroth
2007, The Auk (124) 986-999
We have developed a system for simulating the conditions of avian surveys in which birds are identified by sound. The system uses a laptop computer to control a set of amplified MP3 players placed at known locations around a survey point. The system can realistically simulate a known population of...
Effect of bedrock permeability on subsurface stormflow and the water balance of a trenched hillslope at the Panola Mountain Research Watershed, Georgia, USA
Meerveld H. J. Tromp-van H. J., N.E. Peters, Jeffery J. McDonnell
2007, Hydrological Processes (21) 750-769
The effect of bedrock permeability on subsurface stormflow initiation and the hillslope water balance is poorly understood. Previous hillslope hydrological studies at the Panola Mountain Research Watershed (PMRW), Georgia, USA, have assumed that the bedrock underlying the trenched hillslope is effectively impermeable. This paper presents a series of sprinkling experiments...
Influence of soil chemistry on metal and bioessential element concentrations in nymphal and adult periodical cicadas (Magicicada spp.)
G.R. Robinson Jr., P.L. Sibrell, C.J. Boughton, L.H. Yang
2007, Science of the Total Environment (374) 367-378
Metal and bioessential element concentrations were measured in three species of 17-year periodical cicadas (Magicicada spp.) to determine how cicada tissue chemistry is affected by soil chemistry, measure the bioavailability of metals from both uncontaminated and lead-arsenate-pesticide contaminated soils, and assess the potential risks of observed metal contamination for wildlife....
Geohydrologic assessment of fractured crystalline bedrock on the southern part of Manhattan, New York, through the use of advanced borehole geophysical methods
F. Stumm, A. Chu, P. K. Joesten, J.W. Lane Jr.
2007, Journal of Geophysics and Engineering (4) 245-252
Advanced borehole-geophysical methods were used to assess the geohydrology of fractured crystalline bedrock in 31 of 64 boreholes on the southern part of Manhattan Island, NY in preparation of the construction of a new water tunnel. The study area is located in a highly urbanized part of New York City....
Coastal-change impacts during hurricane katrina: an overview
Asbury Sallenger, C. Wayne Wright, Jeff Lillycrop
2007, Conference Paper, Coastal Sediments '07 - Proceedings of 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes
As part of an ongoing cooperative effort between USGS, NASA and USACE, the barrier islands within the right-front quadrant of Hurricane Katrina were surveyed with airborne lidar both before and after landfall. Dauphin Island, AL was located the farthest from landfall and wave runup intermittently overtopped its central and western...
On the phylogenetic position of the scrub-birds (Passeriformes: Menurae: Atrichornithidae) of Australia
R.T. Chesser, Have J. ten
2007, Journal of Ornithology (148) 471-476
Evolutionary relationships of the scrub-birds Atrichornis were investigated using complete sequences of the recombination-activating gene RAG-1 and the proto-oncogene c-mos for two individuals of the noisy scrub-bird Atrichornis clamosus. Phylogenetic analysis revealed that Atrichornis was sister to the genus Menura (the lyrebirds) and that these two genera (the Menurae) were...
Dominant factors in controlling marine gas pools in South China
S. Xu, W.L. Watney
2007, Frontiers of Earth Science in China (1) 491-497
In marine strata from Sinian to Middle Triassic in South China, there develop four sets of regional and six sets of local source rocks, and ten sets of reservoir rocks. The occurrence of four main formation periods in association with five main reconstruction periods, results in a secondary origin for...
Distinguishing native (Celastrus scandens L.) and invasive (C. orbiculatus Thunb.) bittersweet species using morphological characteristics
S. A. Leicht-Young, N.B. Pavlovic, R. Grundel, K.J. Frohnapple
2007, Journal of the Torrey Botanical Society (134) 441-450
Celastrus orbiculatus is an invasive liana in the Eastern United States. Its native congener, C. scandens, is less common and declining in the Northeast. The correct identification of these two species is often difficult because of their similar vegetative characteristics. Using morphological characteristics of both species growing naturally along a sand dune/forest...
Forces on stationary particles in near-bed turbulent flows
M.W. Schmeeckle, J. M. Nelson, R.L. Shreve
2007, Journal of Geophysical Research F: Earth Surface (112)
In natural flows, bed sediment particles are entrained and moved by the fluctuating forces, such as lift and drag, exerted by the overlying flow on the particles. To develop a better understanding of these forces and the relation of the forces to the local flow, the downstream and vertical components...
Diet and prey selection by Lake Superior lake trout during springs 1986-2001
B.A. Ray, T.R. Hrabik, M.P. Ebener, O. T. Gorman, D.R. Schreiner, S.T. Schram, S.P. Sitar, W.P. Mattes, C.R. Bronte
2007, Journal of Great Lakes Research (33) 104-113
We describe the diet and prey selectivity of lean (Salvelinus namaycush namaycush) and siscowet lake trout (S. n. siscowet) collected during spring (April–June) from Lake Superior during 1986–2001. We estimated prey selectivity by comparing prey numerical abundance estimates from spring bottom trawl surveys and lake trout diet information in similar...
First record of ithytrichia (Trichoptera: Hydroptilidae) in Michigan, U.S.A.
J.M. Craig, M.A. Chriscinske
2007, Entomological News (118) 313-314
[No abstract available]...
