High-resolution proxy record of Holocene climate from a loess section in Southwestern Nebraska, USA
X. Miao, J.A. Mason, W.C. Johnson, Hongfang Wang
2007, Palaeogeography, Palaeoclimatology, Palaeoecology (245) 368-381
Multi-proxy analysis was used to produce a high-resolution paleoclimatic record from an exceptionally thick section of the Holocene Bignell Loess near Wauneta, Southwestern Nebraska, in the central Great Plains. The Wauneta section has excellent age control, based on optically stimulated luminescence (OSL) and radiocarbon dating, and records multiple episodes of...
Preferences, specialization, and management attitudes of trout anglers fishing in Tennessee tailwaters
C.P. Hutt, P.W. Bettoli
2007, North American Journal of Fisheries Management (27) 1257-1267
Efforts to manage several trout fisheries in Tennessee have been stymied by conflicts between management agencies and angler groups. To assist in preventing such conflicts in the future, we examined attitudes and motivations of trout anglers who fished eight tailwater fisheries in Tennessee during 2001-2002. Using a stratified random sampling...
On using surface-source downhole-receiver logging to determine seismic slownesses
D.M. Boore, E.M. Thompson
2007, Soil Dynamics and Earthquake Engineering (27) 971-985
We present a method to solve for slowness models from surface-source downhole-receiver seismic travel-times. The method estimates the slownesses in a single inversion of the travel-times from all receiver depths and accounts for refractions at layer boundaries. The number and location of layer interfaces in the model can be selected...
Rapid sea level rise and ice sheet response to 8,200-year climate event
T. M. Cronin, P.R. Vogt, Debra A. Willard, R. Thunell, J. Halka, M. Berke, J. Pohlman
2007, Geophysical Research Letters (34)
The largest abrupt climatic reversal of the Holocene interglacial, the cooling event 8.6–8.2 thousand years ago (ka), was probably caused by catastrophic release of glacial Lake Agassiz-Ojibway, which slowed Atlantic meridional overturning circulation (AMOC) and cooled global climate. Geophysical surveys and sediment cores from Chesapeake Bay reveal the pattern of...
Beyond SaGMRotI: Conversion to SaArb, SaSN, and SaMaxRot
J. A. Watson-Lamprey, D.M. Boore
2007, Bulletin of the Seismological Society of America (97) 1511-1524
In the seismic design of structures, estimates of design forces are usually provided to the engineer in the form of elastic response spectra. Predictive equations for elastic response spectra are derived from empirical recordings of ground motion. The geometric mean of the two orthogonal horizontal components of motion is often...
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...
Impact of hurricanes storm surges on the groundwater resources
T. P. Van Biersel, D.A. Carlson, L.R. Milner
2007, Environmental Geology (53) 813-826
Ocean surges onto coastal lowlands caused by tropical and extra tropical storms, tsunamis, and sea level rise affect all coastal lowlands and present a threat to drinking water resources of many coastal residents. In 2005, two such storms, Hurricanes Katrina and Rita struck the Gulf Coast of the US. Since...
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...
Occurrence and food habits of the round goby in the profundal zone of southwestern Lake Ontario
M. G. Walsh, D.E. Dittman, R. O'Gorman
2007, Journal of Great Lakes Research (33) 83-92
Little is known about the ecology of round goby (Neogobius melanostomus), an invasive benthic fish, in the profundal zone of the Great Lakes. In April 2002–2005 we caught increasing numbers of round gobies with a bottom trawl in the 45–150 m depth range of southwestern Lake Ontario. In 2005, we...
Did debris-covered glaciers serve as pleistocene refugia for plants? A new hypothesis derived from observations of recent plant growth on glacier surfaces
T. Fickert, D. Friend, F. Gruninger, B. Molnia, M. Richter
2007, Arctic, Antarctic, and Alpine Research (39) 245-257
This study proposes a new hypothesis: Debris-covered glaciers served as Pleistocene biological refugia. This is based on detailed studies of vascular plant growth on six debris-mantled glaciers, literally around the world, as well as many casual observations also across the globe. We find that such glaciers are quite common and...
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...
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]...
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...
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...
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...
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...
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....
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...
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....
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...
Biomarkers of metals exposure in fish from lead-zinc mining areas of Southeastern Missouri, USA
C. J. Schmitt, J.J. Whyte, A.P. Roberts, M.L. Annis, T.W. May, D. E. Tillitt
2007, Ecotoxicology and Environmental Safety (67) 31-47
The potential effects of proposed lead-zinc mining in an ecologically sensitive area were assessed by studying a nearby mining district that has been exploited for about 30 y under contemporary environmental regulations and with modern technology. Blood and liver samples representing fish of three species (largescale stoneroller, Campostoma oligolepis, n=91;...
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...
Bacteriological water quality in and around Lake Pontchartrain following Hurricanes Katrina and Rita
Dennis K. Demcheck, Donald M. Stoeckel, Rebecca N. Bushon, David S. Blehert, Daniel J. Hippe
2007, Circular 1306-7H
Following the Louisiana landfalls of Katrina on August 29 and Rita on September 24, 2005, the local population and the American public were concerned about the effects the hurricanes might have on water quality in Lake Pontchartrain. The lake is a major recreational resource for the region and an important...
Luminescence ages for alluvial-fan deposits in Southern Death Valley: Implications for climate-driven sedimentation along a tectonically active mountain front
M.F. Sohn, S. A. Mahan, J.R. Knott, D.D. Bowman
2007, Quaternary International (166) 49-60
Controversy exists over whether alluvial-fan sedimentation along tectonically active mountain fronts is driven by climatic changes or tectonics. Knowing the age of sedimentation is the key to understanding the relationship between sedimentation and its cause. Alluvial-fan deposits in Death Valley and throughout the arid southwestern United States have long been...
Molecular analysis of fungal communities and laccase genes in decomposing litter reveals differences among forest types but no impact of nitrogen deposition
C.B. Blackwood, M. P. Waldrop, D.R. Zak, R. L. Sinsabaugh
2007, Environmental Microbiology (9) 1306-1316
The fungal community of the forest floor was examined as the cause of previously reported increases in soil organic matter due to experimental N deposition in ecosystems producing predominantly high-lignin litter, and the opposite response in ecosystems producing low-lignin litter. The mechanism proposed to explain this phenomenon was that white-rot...
