Atlantic Flyway review: Piedmont-Coastal Plain, Region IV, Fall 2001: Patuxent powerline right-of-way (390-0764)
Deanna K. Dawson
2002, North American Bird Bander (27) 100-100
After one of the quietest Septembers since this station opened in 1980, a record high number of birds was captured in October, making the seasonal total almost identical to that in fall 2000. Capture totals exceeded 100 on eight mornings between 9 and 24 Oct, and a new daily high...
USGS leads United States effort in Mallik Well
2002, Fire in the Ice: NETL Methane Hydrate Newsletter (2) 3-4
This winter, in the extremely cold, far reaches of the upper Northwest Territory of Canada, there is an international consortium of researchers participating in a program to study methane hydrates. The researchers are currently drilling a 1200 m-deep production research well through the permafrost. It is one of three wells...
Survival of stream-dwelling Atlantic salmon: Effects of life history variation, season, and age
B. H. Letcher, G. Gries, F. Juanes
2002, Transactions of the American Fisheries Society (131) 838-854
To determine seasonal and age-class variation in the abundance and survival of Atlantic salmon Salmo salar, we conducted multiple samplings of individually tagged juveniles in a small stream (West Brook, Massachusetts). We also estimated the differences in survival and probability of smolting for mature and immature parr. Survival was approximately twofold...
Very-long-period volcanic earthquakes beneath Mammoth Mountain, California
David P. Hill, P. Dawson, M.J.S. Johnston, A.D. Pitt, G. Biasi, K. Smith
2002, Geophysical Research Letters (29) 8-1-8-4
Detection of three very‐long‐period (VLP) volcanic earthquakes beneath Mammoth Mountain emphasizes that magmatic processes continue to be active beneath this young, eastern California volcano. These VLP earthquakes, which occurred in October 1996 and July and August 2000, appear as bell‐shaped pulses with durations of one to two...
Using satellite telemetry to define spatial population structure in polar bears in the Norwegian and western Russian Arctic
Mette Mauritzen, Andrew E. Derocher, Øystein Wiig, Stanislav Belikov, Andrei N. Boltunov, Gerald W. Garner
2002, Journal of Applied Ecology (39) 79-90
1. Animal populations, defined by geographical areas within a species’ distribution where population dynamics are largely regulated by births and deaths rather than by migration from surrounding areas, may be the correct unit for wildlife management. However, in heterogeneous landscapes varying habitat quality may yield subpopulations with distinct patterns in...
Comparison of 5 benthic samplers to collect burrowing mayfly nymphs (Hexagenia spp.:Ephemeroptera:Ephemeridae) in sediments of the Laurentian Great Lakes
Don W. Schloesser, Thomas F. Nalepa
2002, Journal of the North American Benthological Society (21) 487-501
The recent return of burrowing mayfly nymphs (Hexagenia spp.) to western Lake Erie of the Laurentian Great Lakes has prompted a need to find a sampler to obtain the most accurate (i.e., highest mean density) and precise (i.e., lowest mean variance) abundance estimates of nymphs. The abundance of burrowing nymphs is...
Does bird community structure vary with landscape patchiness? A Chihuahuan Desert perspective
K.J. Gutzwiller, W.C. Barrow Jr.
2002, Oikos (98) 284-298
During the springs of 1995-1997, we studied birds and landscapes at 70 sites in the Chihuahuan Desert to assess relations between bird community structure and landscape patchiness. Within each of two spatial extents (1-kin and 2-km-radius areas centered on each site), we measured the number of patches of individual land-cover...
Nesting ecology of tundra swans on the coastal Yukon-Kuskokwim Delta, Alaska
Colleen A. Babcock, A. C. Fowler, Craig R. Ely
2002, Waterbirds (25) 236-240
Nesting ecology of Tundra Swans (Cygnus columbianus columbianus) was studies the Kashunuk River near Old Chevak (61A?26a??N, 165A?27a??W), on the Yukon-Kuskokwim Delta of western Alaska from 1988-2000. Annual variation in snow-melt chronology, nesting phenology, nesting density, clutch size and nest success was examined. The same area (approximately 23 kmA?) was...
The oligocene Lund Tuff, Great Basin, USA: A very large volume monotonous intermediate
L.L. Maughan, E. H. Christiansen, M. G. Best, C. S. Grommé, A.L. Deino, D.G. Tingey
2002, Journal of Volcanology and Geothermal Research (113) 129-157
Unusual monotonous intermediate ignimbrites consist of phenocryst-rich dacite that occurs as very large volume (> 1000 km3) deposits that lack systematic compositional zonation, comagmatic rhyolite precursors, and underlying plinian beds. They are distinct from countless, usually smaller volume, zoned rhyolite-dacite-andesite deposits that are conventionally believed to have erupted from magma...
Using chemical, hydrologic, and age dating analysis to delineate redox processes and flow paths in the riparian zone of a glacial outwash aquifer‐stream system
Larry J. Puckett, Timothy K. Cowdery, Peter B. McMahon, Lan H. Tornes, Jeffrey D. Stoner
2002, Water Resources Research (38) 9-1-9-20
A combination of chemical and dissolved gas analyses, chlorofluorocarbon age dating, and hydrologic measurements were used to determine the degree to which biogeochemical processes in a riparian wetland were responsible for removing NO3−from groundwaters discharging to the Otter Tail River in west central Minnesota. An analysis of river chemistry and...
Further considerations of the Ce/Yb vs. Ba/Ce plot in volcanology and tectonics
Bruce R. Doe
2002, International Geology Review (44) 877-912
A plot of Ce/Yb vs. Ba/Ce, for locality averages, effectively separates mid-ocean ridge basalts (MORB) (Ce/Yb <10, Ba/Ce 1-4.2), oceanic island volcanics (OIV) (Ce/Yb >10, Ba/Ce <6), which are generally hotspot related, and island arc volcanics (IAV) (Ce/Yb <23, Ba/Ce >4.2). The conventional interpretation is that these three types of...
Consistency of patterns in concentration‐discharge plots
Jeffrey G. Chanat, Karen C. Rice, George M. Hornberger
2002, Water Resources Research (38) 22-1-22-10
Concentration‐discharge (c‐Q) plots have been used to infer how flow components such as event water, soil water, and groundwater mix to produce the observed episodic hydrochemical response of small catchments. Because c‐Q plots are based only on observed streamflow and solute concentration, their interpretation requires assumptions about...
Fitness consequences of nest desertion in an endangered host, the least Bell's vireo
Barbara E. Kus
2002, Condor (104) 795-802
Recent analyses of the impact of cowbird parasitism on host productivity suggest that while parasitism reduces productivity on a per-nest basis, the ability of pairs to desert parasitized nests and renest allows them to achieve productivity comparable to that of unparasitized pairs. This has implications for the management of several...
Use of satellite telemetry to identify common loon migration routes, staging areas and wintering range
Kevin P. Kenow, Michael W. Meyer, David Evers, David C. Douglas, J. Hines
2002, Waterbirds (25) 449-458
We developed a satellite transmitter attachment technique for adult Common Loons (Gavia immer) that would help in identifying important migration routes, staging areas, and the location of wintering grounds of birds that breed in the north central United States. During the autumn and winter of 1998, the migration of...
Avian furcula morphology may indicate relationships of flight requirements among birds
Clifford Hui
2002, Journal of Morphology (251) 284-293
This study examined furcula (wishbone) shape relative to flight requirements. The furculae from 53 museum specimens in eight orders were measured: 1) three-dimensional shape (SR) as indicated by the ratio of the direct distance between the synostosis interclavicularis and the ligamentous attachment of one of its clavicles to the actual...
Adaptive inference for distinguishing credible from incredible patterns in nature
Crawford S. Holling, Craig R. Allen
2002, Ecosystems (5) 319-328
Strong inference is a powerful and rapid tool that can be used to identify and explain patterns in molecular biology, cell biology, and physiology. It is effective where causes are single and separable and where discrimination between pairwise alternative hypotheses can be determined experimentally by a simple yes or no...
Spent shot availability and ingestion on areas managed for mourning doves
J.H. Schulz, J.J. Millspaugh, B.E. Washburn, G.R. Wester, J. T. Lanigan III, J. C. Franson
2002, Wildlife Society Bulletin (30) 112-120
Mourning dove (Zenaida macroura) hunting is becoming increasingly popular, especially in managed shooting fields. Given the possible increase in the availability of lead (Pb) shot on these areas, our objective was to estimate availability and ingestion of spent shot at the Eagle Bluffs Conservation Area (EBCA, hunted with nontoxic shot)...
Adaptive moving mesh methods for simulating one-dimensional groundwater problems with sharp moving fronts
W. Huang, Lingyun Zheng, X. Zhan
2002, International Journal for Numerical Methods in Engineering (54) 1579-1603
Accurate modelling of groundwater flow and transport with sharp moving fronts often involves high computational cost, when a fixed/uniform mesh is used. In this paper, we investigate the modelling of groundwater problems using a particular adaptive mesh method called the moving mesh partial differential equation approach. With this approach, the...
Preface
M. Friend
2002, Hydrobiologia (473) vii-xii
This issue of Hydrobiologia brings together a series of papers resulting from an intensified effort to describe the current status of the physical and biological conditions present at California's Salton Sea. Most of the studies were contract investigations that were part of a project initiated in January 1998 to pursue...
Biot-Gassmann theory for velocities of gas hydrate-bearing sediments
Myung W. Lee
2002, Geophysics (67) 1711-1719
Elevated elastic velocities are a distinct physical property of gas hydrate-bearing sediments. A number of velocity models and equations (e.g., pore-filling model, cementation model, effective medium theories, weighted equations, and time-average equations) have been used to describe this effect. In particular, the weighted equation and effective medium theory predict reasonably...
High-resolution seismic-reflection investigation of the northern Gulf of Mexico gas-hydrate-stability zone
A. K. Cooper, P. E. Hart
2002, Marine and Petroleum Geology (19) 1275-1293
We recorded high-resolution seismic-reflection data in the northern Gulf of Mexico to study gas and gas-hydrate distribution and their relation to seafloor slides. Gas hydrate is widely reported near the seafloor, but is described at only one deep drill site. Our data show high-reflectivity zones (HRZs) near faults, diapirs, and...
Magnitude estimates of two large aftershocks of the 16 December 1811 New Madrid earthquake
S. E. Hough, S. Martin
2002, Bulletin of the Seismological Society of America (92) 3259-3268
The three principal New Madrid mainshocks of 1811-1812 were followed by extensive aftershock sequences that included numerous felt events. Although no instrumental data are available for either the mainshocks or the aftershocks, available historical accounts do provide information that can be used to estimate magnitudes and locations for the large...
Groundwater contamination downstream of a contaminant penetration site. I. Extension-expansion of the contaminant plume
H. Rubin, R. W. Buddemeier
2002, Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering (37) 1781-1812
This study concerns the possible use of boundary layer (BL) approach for the analysis and evaluation of contaminant transport in groundwater due to contaminant penetration into the groundwater aquifer through a site of limited size. The contaminant penetration may occur through either the upper (surface) or lower (bedrock) boundary of...
Physical and chemical effects of grain aggregates on the Palos Verdes margin, southern California
D.E. Drake, R. Eganhouse, W. McArthur
2002, Continental Shelf Research (22) 967-986
Large discharges of wastewater and particulate matter from the outfalls of the Los Angeles County Sanitation Districts onto the Palos Verdes shelf since 1937 have produced an effluent-affected sediment deposit characterized by low bulk density, elevated organic matter content, and a high percentage of fine silt and clay particles relative...
Sea level response to ENSO along the central California coast: How the 1997-1998 event compares with the historic record
H. F. Ryan, M. Noble
2002, Progress in Oceanography (54) 149-169
Long-term monthly sea level and sea surface temperature (SST) anomalies from central California show that during winter months, positive anomalies are associated with El Niño events and the negative ones with La Niña events. There is no significant impact on monthly mean anomalies associated with Pacific decadal oscillations, although there...
