Amphibian, reptilian, and avian remains from the Fox Hills Formation (Maastrichtian): Shoreline and estuarine deposits of the Pierre Sea in south-central North Dakota
J.W. Hoganson, J.M. Erickson, F.D. Holland Jr.
2007, Special Paper of the Geological Society of America 239-256
Although vertebrate fossils, except for fish, are not common in the Maastrichtian Fox Hills Formation, amphibian, reptilian, and avian remains have been recovered at several localities in south-central North Dakota from shoreline facies of the retreating Pierre-Fox Hills seaway. This mixed fauna of aquatic, terrestrial, and marine taxa provides insight...
Salt tectonics and shallow subseafloor fluid convection: Models of coupled fluid-heat-salt transport
A. Wilson, C. Ruppel
2007, Geofluids (7) 377-386
Thermohaline convection associated with salt domes has the potential to drive significant fluid flow and mass and heat transport in continental margins, but previous studies of fluid flow associated with salt structures have focused on continental settings or deep flow systems of importance to petroleum exploration. Motivated by recent geophysical...
Evaluation of grassland dynamics in the northern-tibet plateau of china using remote sensing and climate data
Jiahua Zhang, Fengmei Yao, Lingyun Zheng, Limin Yang
2007, Sensors (7) 3312-3328
The grassland ecosystem in the Northern-Tibet Plateau (NTP) of China is very sensitive to weather and climate conditions of the region. In this study, we investigate the spatial and temporal variations of the grassland ecosystem in the NTP using the NOAA/AVHRR ten-day maximum NDVI composite data of 1981-2001. The relationships...
Sea otters in a dirty ocean
David A. Jessup, Melissa A. Miller, Christine Kreuder Johnson, Patricia A. Conrad, M. Tim Tinker, James A. Estes, Jonna A.K. Mazet
2007, Journal of the American Veterinary Medical Association (231) 1648-1652
No abstract available....
Subspecific variation in the widespread burl-forming Arctostaphylos glandulosa
Jon E. Keeley, Michael C. Vasey, V. Thomas Parker
2007, Madroño (54) 42-62
The genus Arctostaphylos consists mostly of chaparral shrubs known by the common name manzanita, and one of the widest ranging of these is A. glandulosa Eastw., distributed from Baja California to Oregon. Particularly in the southern half of its range it exhibits complex patterns of morphological variation that have long presented taxonomic challenges. Phenetic...
Thamnophis hammondii foraging behavior
Edward L. Ervin, Robert N. Fisher
2007, Herpetological Review (38) 345-346
Thamnophis hammondii is considered one of the most aquatic of the gartersnakes and is closely associated with creeks and impoundments (Fitch 1940. Univ. California Publ. Zool. 44:1–150) with a diet consisting largely of both the larvae and transformed stages of amphibians (Spea, Bufo, Rana, Pseudacris) and small fish (Oncorhynchus, Gasterosteus,...
Heterogeneity of soil nutrients and subsurface biota in a dryland ecosystem
D.C. Housman, C.M. Yeager, B.J. Darby, R.L. Sanford Jr., C.R. Kuske, D.A. Neher, J. Belnap
2007, Soil Biology and Biochemistry (39) 2138-2149
Dryland ecosystems have long been considered to have a highly heterogeneous distribution of nutrients and soil biota, with greater concentrations of both in soils under plants relative to interspace soils. We examined the distribution of soil resources in two plant communities (dominated by either the shrub Coleogyne ramosissima or the...
Research on the impacts of past and future hurricanes on the endangered Florida manatee
Catherine A. Langtimm, M. Dennis Krohn, Bradley Stith, James P. Reid, C.A. Beck, Susan M. Butler
2007, Circular 1306-6J
U.S. Geological Survey (USGS) research on Florida manatees (Trichechus manatus latirostris) from 1982 through 1998 identified lower apparent survival rates for adult manatees during years when Hurricane Elena (1985), the March "Storm of the Century"(1993), and Hurricane Opal (1995) hit the northern coast of the Gulf of Mexico. Although our...
Alternative community structures in a kelp-urchin community: A qualitative modeling approach
G. Montano-Moctezuma, H.W. Li, P.A. Rossignol
2007, Ecological Modelling (205) 343-354
Shifts in interaction patterns within a community may result from periodic disturbances and climate. The question arises as to the extent and significance of these shifting patterns. Using a novel approach to link qualitative mathematical models and field data, namely using the inverse matrix to identify the community matrix, we...
Topography-based analysis of Hurricane Katrina inundation of New Orleans
Dean Gesch
2007, Circular 1306-3G
The ready availability of high-resolution, high-accuracy elevation data proved valuable for development of topographybased products to determine rough estimates of the inundation of New Orleans, La., from Hurricane Katrina. Because of its high level of spatial detail and vertical accuracy of elevation measurements, light detection and ranging (lidar) remote sensing...
Evolving plans for the USA National Phenology Network
J.L. Betancourt, M.D. Schwartz, D.D. Breshears, C.A. Brewer, G. Frazer, J.E. Gross, S.J. Mazer, B. C. Reed, B.E. Wilson
2007, Conference Paper, Eos
[No abstract available]...
Differential expression of gill Na+,K+-ATPaseα - and β-subunits, Na+,K+,2Cl- cotransporter and CFTR anion channel in juvenile anadromous and landlocked Atlantic salmon Salmo salar
Tom O. Nilsen, Lars O.E. Ebbesson, Steffen S. Madsen, Stephen D. McCormick, Eva Andersson, Bjorn Thrandur Bjornsson, Patrick Prunet, Sigurd O. Stefansson
2007, Journal of Experimental Biology (210) 2885-2896
This study examines changes in gill Na+,K+-ATPase (NKA) α- and β-subunit isoforms, Na+,K+,2Cl- cotransporter (NKCC) and cystic fibrosis transmembrane conductance regulator (CFTR I and II) in anadromous and landlocked strains of Atlantic salmon during parr-smolt transformation, and after seawater (SW) transfer in May/June. Gill NKA activity increased from February through April,...
USGS Rocky Mountain Geographic Science Center’s 2005 hurricane response and recovery activities
Jill J. Cress, Susan E. Goplen, Jeff L. Sloan, Jennifer L. Stefanacci, Stanley R. Wilds
2007, Circular 1306-4A
Sophisticated monitoring systems and analysis products were key components to emergency response and Federal recovery activities during the 2005 hurricane season. The U.S. Geological Survey's (USGS) Rocky Mountain Geographic Science Center worked with a number of Federal agencies to provide these types of near real-time geospatial monitoring systems and analysis...
The Penokean orogeny in the Lake Superior region
K. J. Schulz, W.F. Cannon
2007, Precambrian Research (157) 4-25
The Penokean orogeny began at about 1880 Ma when an oceanic arc, now the Pembine-Wausau terrane, collided with the southern margin of the Archean Superior craton marking the end of a period of south-directed subduction. The docking of the buoyant craton to the arc resulted in a subduction jump to...
GIS for the Gulf: A reference database for hurricane-affected areas
Dave Greenlee
2007, Circular 1306-4C
A week after Hurricane Katrina made landfall in Louisiana, a collaboration among multiple organizations began building a database called the Geographic Information System for the Gulf, shortened to "GIS for the Gulf," to support the geospatial data needs of people in the hurricane-affected area. Data were gathered from diverse sources...
Nitrous oxide fluxes from cultivated areas and rangeland: U.S. High Plains
Edwin P. Weeks, Peter B. McMahon
2007, Vadose Zone Journal (6) 496-510
Concentration profiles of N2O, a greenhouse gas, and the conservative trace gases SF6 and the chlorofluorocarbons CFC-11, CFC-12, CFC-113, and were measured periodically through thick vadose zones at nine sites in the U.S. High Plains. The CFC and SF6 measurements were used to calibrate a one-dimensional gas diffusion model, using...
Microbial sulfate reduction and metal attenuation in pH 4 acid mine water
C.D. Church, R.T. Wilkin, Charles N. Alpers, R. O. Rye, R.B. Blaine
2007, Geochemical Transactions (8)
Sediments recovered from the flooded mine workings of the Penn Mine, a Cu-Zn mine abandoned since the early 1960s, were cultured for anaerobic bacteria over a range of pH (4.0 to 7.5). The molecular biology of sediments and cultures was studied to determine whether sulfate-reducing bacteria (SRB) were active in...
Survival of breeding Pacific common eiders on the Yukon-Kuskokwim Delta, Alaska
H.M. Wilson, Paul L. Flint, Christine L. Moran, A.N. Powell
2007, Journal of Wildlife Management (71) 403-410
Populations of Pacific common eiders (Somateria mollissima v-nigrum) breeding in Alaska, USA, have declined markedly over the past 40 years. We studied survival of adult female Pacific common eiders using capture—recapture of nesting hens at 3 sites on the Yukon-Kuskokwim Delta (YKD), Alaska from 1994 to 2004. We used data...
Petrology and tectonics of Phanerozoic continent formation: From island arcs to accretion and continental arc magmatism
C.-T.A. Lee, D. M. Morton, R. W. Kistler, A. K. Baird
2007, Earth and Planetary Science Letters (263) 370-387
Mesozoic continental arcs in the North American Cordillera were examined here to establish a baseline model for Phanerozoic continent formation. We combine new trace-element data on lower crustal xenoliths from the Mesozoic Sierra Nevada Batholith with an extensive grid-based geochemical map of the Peninsular Ranges Batholith, the southern equivalent of...
Temporal changes of populations and trophic relationships of wintering diving ducks in Chesapeake Bay
Matthew C. Perry, Alicia M. Wells-Berlin, David M. Kidwell, Peter C. Osenton
2007, Waterbirds (30) 4-16
Population and trophic relationships among diving ducks in Chesapeake Bay are diverse and complex as they include five species of bay ducks (Aythya spp.), nine species of seaducks (Tribe Mergini), and the Ruddy Duck (Oxyura jamaicensis). Here we considered the relationships between population changes and diet over the past half...
White sturgeon (Acipenser transmontanus) passage at the Dalles Dam, Columbia River, USA
M.J. Parsley, C.D. Wright, B. K. Van Der Leeuw, E.E. Kofoot, C.A. Peery, M.L. Moser
2007, Journal of Applied Ichthyology (23) 627-635
White sturgeon (Acipenser transmontanus) ???95 cm TL were monitored using acoustic and radio telemetry at a large hydroelectric dam (the Dalles Dam) on the Columbia River, during March 2004 through November 2005 to determine timing and routes of passage and to characterize general movements. Transmitters were surgically implanted into 148...
Local and regional factors affecting atmospheric mercury speciation at a remote location
H. Manolopoulos, J.J. Schauer, M.D. Purcell, T.M. Rudolph, Mark L. Olson, B. Rodger, David P. Krabbenhoft
2007, Journal of Environmental Engineering and Science (6) 491-501
Atmospheric concentrations of elemental (Hg0), reactive gaseous (RGM), and particulate (PHg) mercury were measured at two remote sites in the midwestern United States. Concurrent measurements of Hg0, PHg, and RGM obtained at Devil's Lake and Mt. Horeb, located approximately 65 km apart, showed that Hg0 and PHg concentrations were affected...
Evaluating planetary digital terrain models-The HRSC DTM test
C. Heipke, J. Oberst, J. Albertz, M. Attwenger, P. Dorninger, E. Dorrer, M. Ewe, S. Gehrke, K. Gwinner, H. Hirschmuller, J.R. Kim, Randolph L. Kirk, H. Mayer, Jan-Peter Muller, R. Rengarajan, M. Rentsch, R. Schmidt, F. Scholten, J. Shan, M. Spiegel, M. Wahlisch, G. Neukum
2007, Planetary and Space Science (55) 2173-2191
The High Resolution Stereo Camera (HRSC) has been orbiting the planet Mars since January 2004 onboard the European Space Agency (ESA) Mars Express mission and delivers imagery which is being used for topographic mapping of the planet. The HRSC team has conducted a systematic inter-comparison of different alternatives for the...
Windy Mars: A dynamic planet as seen by the HiRISE camera
Nathan T. Bridges, Paul E. Geissler, Alfred S. McEwen, B.J. Thomson, Frank C. Chuang, Kenneth E. Herkenhoff, Laszlo P. Keszthelyi, Sara Martinez-Alonso
2007, Geophysical Research Letters (34)
With a dynamic atmosphere and a large supply of particulate material, the surface of Mars is heavily influenced by wind-driven, or aeolian, processes. The High Resolution Imaging Science Experiment (HiRISE) camera on the Mars Reconnaissance Orbiter (MRO) provides a new view of Martian geology, with the ability to see decimeter-size...
Genetic studies of freshwater turtle and tortoises: a review of the past 70 years
Nancy N. FitzSimmons, Kristen M. Hart
2007, Conference Paper, Defining turtle diversity: proceedings of a workshop on genetics, ethics, and taxonomy of freshwater turtles and tortoises, Cambridge, Massachusetts, 8-12 August 2005
Powerful molecular techniques have been developed over many decades for resolving genetic relationships, population genetic structure, patterns of gene flow, mating systems, and the amount of genetic diversity in animals. Genetic studies of turtles were among the earliest and the rapid application of new genetic tools and analytical techniques is...
