Scales of equilibrium and disequilibrium during cleavage formation in chlorite and biotite-grade phyllites, SE Vermont
C. K. McWilliams, R. P. Wintsch, Michael J. Kunk
2007, Journal of Metamorphic Geology (25) 895-913
Detailed electron microprobe analyses of phyllosilicates in crenulated phyllites from south-eastern Vermont show that grain-scale zoning is common, and sympathetic zoning in adjacent minerals is nearly universal. We interpret this to reflect a pressure-solution mechanism for cleavage development, where precipitation from a very small fluid reservoir fractionated that fluid. Multiple...
Mineral resource of the month: vanadium
Michael J. Magyar
2007, Geotimes (2007)
Vanadium, the name of which comes from Vanadis, a goddess in Scandinavian mythology, is one of the most important ferrous metals. Vanadium has many uses, but the metal’s metallurgical applications, such as an alloying element in iron and steel, account for more than 85 percent of U.S. consumption. The dominant...
Genetic diversity of infectious hematopoietic necrosis virus from Feather River and Lake Oroville, California, and virulence of selected isolates for Chinook salmon and rainbow trout
C.M. Bendorf, G.O. Kelley, S.C. Yun, Gael Kurath, K.B. Andree, R.P. Hedrick
2007, Journal of Aquatic Animal Health (19) 254-269
Infectious hematopoietic necrosis virus (IHNV) is a significant pathogen of young salmonid fishes worldwide but particularly within the historical range of the Pacific Northwest and California. In the Sacramento and San Joaquin River drainages of California, IHNV outbreaks in juvenile Chinook salmon Oncorhynchus tshawytscha have been observed regularly at large...
A simple daily soil-water balance model for estimating the spatial and temporal distribution of groundwater recharge in temperate humid areas
W. R. Dripps, K. R. Bradbury
2007, Hydrogeology Journal (15) 433-444
Quantifying the spatial and temporal distribution of natural groundwater recharge is usually a prerequisite for effective groundwater modeling and management. As flow models become increasingly utilized for management decisions, there is an increased need for simple, practical methods to delineate recharge zones and quantify recharge rates. Existing models for estimating...
Reappearance of deepwater sculpin in Lake Ontario: Resurgence or last gasp of a doomed population?
B.F. Lantry, R. O'Gorman, M. G. Walsh, J.M. Casselman, J.A. Hoyle, M.J. Keir, J.R. Lantry
2007, Journal of Great Lakes Research (33) 34-45
Deepwater sculpin (Myoxocephalus thompsonii) were abundant in Lake Ontario in the 1920s and at least common into the 1940s. By the 1960s they were rare and, thereafter, some considered the population extirpated even though a synoptic survey of the lake in 1972 produced three, relatively large (148–165 mm total length,...
Geologic framework of the Mississippian Barnett Shale, Barnett-Paleozoic total petroleum system, Bend arch-Fort Worth Basin, Texas
R. M. Pollastro, D.M. Jarvie, R.J. Hill, C.W. Adams
2007, American Association of Petroleum Geologists Bulletin (91) 405-436
This article describes the primary geologic characteristics and criteria of the Barnett Shale and Barnett-Paleozoic total petroleum system (TPS) of the Fort Worth Basin used to define two geographic areas of the Barnett Shale for petroleum resource assessment. From these two areas, referred to as "assessment units," the U.S. Geological...
Distribution and accumulation of mercury in tissues of captive-reared common loon (Gavia immer) chicks
K.P. Kenow, M.W. Meyer, R. K. Hines, W. H. Karasov
2007, Environmental Toxicology and Chemistry (26) 1047-1055
We determined the distribution and accumulation of Hg in tissues of common loon (Gavia immer) chicks maintained for up to 15 weeks on either a control diet with no added methylmercury chloride (MeHgCl) or one containing either 0.4 or 1.2 ??g Hg (as MeHgCl)/g wet-weight food. Total Hg and MeHg...
Soft-sediment deformation produced by tides in a meizoseismic area, Turnagain Arm, Alaska
S.F. Greb, A.W. Archer
2007, Geology (35) 435-438
Turnagain Arm is a semidiurnal hypertidal estuary in southeastern Alaska with a recorded tidal range of 9 m. Contorted bedding and flow rolls preserved in tidal sediments within the estuary have previously been interpreted as resulting from the Mw 9.2 Great Alaskan earthquake of 1964. Horizons of flow rolls between...
Mammoth (Mammuthus sp.) excavation on a college campus in Western Illinois, USA
J.D. Treworgy, J.J. Saunders, D.A. Grimley
2007, Quaternary International (169-170) 24-28
The discovery of the remains of a mammoth, Mammuthus sp., on the Principia College campus in Elsah, Illinois, has allowed for careful excavation by students over several years. The mammoth is relatively well preserved in late Wisconsin Peoria Silt on the top of the bluffs of the Mississippi River. The...
Effects of intraborehole flow on groundwater age distribution
B.A. Zinn, Leonard F. Konikow
2007, Hydrogeology Journal (15) 633-643
Environmental tracers are used to estimate groundwater ages and travel times, but the strongly heterogeneous nature of many subsurface environments can cause mixing between waters of highly disparate ages, adding additional complexity to the age-estimation process. Mixing may be exacerbated by the presence of wells because long open intervals or...
Temperature and diet effects on omnivorous fish performance: Implications for the latitudinal diversity gradient in herbivorous fishes
M.D. Behrens, K. D. Lafferty
2007, Canadian Journal of Fisheries and Aquatic Sciences (64) 867-873
Herbivorous fishes show a clear latitudinal diversity gradient, making up a larger proportion of the fish species in a community in tropical waters than in temperate waters. One proposed mechanism that could drive this gradient is a physiological constraint due to temperature. One prediction based on this mechanism is that...
Progressive oxidation of pyrite in five bituminous coal samples: An As XANES and 57Fe Mössbauer spectroscopic study
Allan Kolker, Frank E. Huggins
2007, Applied Geochemistry (22) 778-787
Naturally occurring pyrite commonly contains minor substituted metals and metalloids (As, Se, Hg, Cu, Ni, etc.) that can be released to the environment as a result of its weathering. Arsenic, often the most abundant minor constituent in pyrite, is a sensitive monitor of progressive pyrite oxidation in coal. To test...
Advanced technologies demonstrated by the miniature integrated camera and spectrometer (MICAS) aboard deep space 1
D.H. Rodgers, P.M. Beauchamp, L.A. Soderblom, R. H. Brown, G.-S. Chen, M. Lee, B.R. Sandel, D.A. Thomas, R.T. Benoit, R.V. Yelle
2007, Space Science Reviews (129) 309-326
MICAS is an integrated multi-channel instrument that includes an ultraviolet imaging spectrometer (80-185 nm), two high-resolution visible imagers (10-20 ??rad/pixel, 400-900 nm), and a short-wavelength infrared imaging spectrometer (1250-2600 nm). The wavelength ranges were chosen to maximize the science data that could be collected using existing semiconductor technologies and avoiding...
Using a bioenergetic model to assess growth reduction from catch-and-release fishing and hooking injury in rainbow trout, Oncorhynchus mykiss
Julie M. Meka, F.J. Margraf
2007, Fisheries Management and Ecology (14) 131-139
A bioenergetic model was used to predict the potential effects of feeding cessation caused by catch-and-release capture and a reduction in feeding efficiency from hooking injuries on rainbow trout, Oncorhynchus mykiss (Walbaum), growth in southwest Alaska, USA. Simulations indicated that a 1-day feeding cessation for a rainbow trout captured one to two...
Effect of horseshoe crab spawning density on nest disturbance and exhumation of eggs: A simulation study
D. R. Smith
2007, Estuaries and Coasts (30) 287-295
Because the Delaware Bay horseshoe crab (Limulus polyphemus) population is managed to provide for dependent species, such as migratory shorebirds, there is a need to understand the process of egg exhumation and to predict eggs available to foraging shorebirds. A simple spatial model was used to simulate horseshoe crab spawning...
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...
Possible ancient giant basin and related water enrichment in the Arabia Terra province, Mars
J. M. Dohm, N.G. Barlow, R. C. Anderson, J.-P. Williams, H. Miyamoto, J.C. Ferris, R.G. Strom, G.J. Taylor, A.G. Fairen, V.R. Baker, W. V. Boynton, J.M. Keller, K. Kerry, D. Janes, J.A.P. Rodriguez, T.M. Hare
2007, Icarus (190) 74-92
A circular albedo feature in the Arabia Terra province was first hypothesized as an ancient impact basin using Viking-era information. To test this unpublished hypothesis, we have analyzed the Viking era-information together with layers of new data derived from the Mars Global Surveyor (MGS) and Mars Odyssey (MO) missions. Our...
Paleoenvironmental assessment of recent environmental changes in Florida Bay, USA: a biomarker based study
Y. Xu, C. W. Holmes, R. Jaffe
2007, Estuarine, Coastal and Shelf Science (73) 201-210
The extractable lipid compositions in four Florida Bay cores were determined in order to understand environmental changes over the last 160 years. The most significant environmental change was recorded by oscillations in the amplitude and frequency of biomarkers during the 20th century. Two seagrass molecular proxies (Paq and the C25/C27n-alkan-2-one...
Chemistry of thermally altered high volatile bituminous coals from southern Indiana
R. Walker, Maria Mastalerz, S. Brassell, E. Elswick, J.C. Hower, A. Schimmelmann
2007, International Journal of Coal Geology (71) 2-14
The optical properties and chemical characteristics of two thermally altered Pennsylvanian high volatile bituminous coals, the non-coking Danville Coal Member (Ro = 0.55%) and the coking Lower Block Coal Member (Ro = 0.56%) were investigated with the purpose of understanding differences in their coking behavior. Samples of the coals were...
Post-breeding season habitat use and movements of eastern meadowlarks in southwestern Wisconsin
Michael J. Guzy, C. A. Ribic
2007, Wilson Journal of Ornithology (119) 198-204
We used radio telemetry to study post-breeding movements of adult female and juvenile Eastern Meadowlarks (Sturnella magna) in southwestern Wisconsin in 2002-2004. Twenty-one adult females were found 58% of the time in their nest field regardless of nest fate. Three adult females were not found outside of the field where...
Dust deposition on the Mars Exploration Rover Panoramic Camera (Pancam) calibration targets
K.M. Kinch, J. Sohl-Dickstein, J.F. Bell III, J. R. Johnson, W. Goetz, G. A. Landis
2007, Journal of Geophysical Research E: Planets (112)
The Panoramic Camera (Pancam) on the Mars Exploration Rover mission has acquired in excess of 20,000 images of the Pancam calibration targets on the rovers. Analysis of this data set allows estimates of the rate of deposition and removal of aeolian dust on both rovers. During the first 150-170 sols...
Quasi-horizontal circulation cells in 3D seawater intrusion
E. Abarca, J. Carrera, X. Sanchez-Vila, Clifford I. Voss
2007, Journal of Hydrology (339) 118-129
The seawater intrusion process is characterized by the difference in freshwater and seawater density that causes freshwater to float on seawater. Many confined aquifers have a large horizontal extension with respect to thickness. In these cases, while buoyancy acts in the vertical direction, flow is confined between the upper and...
Using drill cutting separates to estimate the strength of narrow shear zones at SAFOD
C. Morrow, J. Solum, S. Tembe, D. Lockner, T.-F. Wong
2007, Geophysical Research Letters (34)
[1] A technique is presented for estimating frictional strength of narrow shear zones based on hand selection of drillhole cuttings separates. Tests were conducted on cuttings from the SAFOD scientific drillhole near Parkfield, California. Since cuttings are mixed with adjacent material as they travel up the...
Winter behavior and ecology of the Alder Flycatcher (Empidonax alnorum) in Peru
M.S. Foster
2007, Ornitologia Neotropical (18) 171-186
The winter ecology and behavior of Alder Flycatchers (Empidonax alnorum) were studied along the Manu, a white-water meander river in Manu National Park, Madre de Dios, Peru?? during October and November, 1993 to 1997. The birds occupied territories in primary-succession habitats on growing point bars. They were most common in...
Possible use of foresight, understanding, and planning by wolves hunting muskoxen
L. David Mech
2007, Arctic (60) 145-149
On Ellesmere Island in 2006, arctic wolves (Canis lupus arctos) were observed making a two-pronged approach to a herd of muskoxen (Ovibos moschatus) and, on another occasion, ambushing muskoxen. Both observations seemed to provide evidence that the wolves were using foresight, understanding, and planning. Although the possible use of insight...
