Shallow-velocity models at the Kilauea Volcano, Hawaii, determined from array analyses of tremor wavefields
G. Saccorotti, B. Chouet, P. Dawson
2003, Geophysical Journal International (152) 633-648
The properties of the surface wavefield at Kilauea Volcano are analysed using data from small-aperture arrays of short-period seismometers deployed in and around the Kilauea caldera. Tremor recordings were obtained during two Japan-US cooperative experiments conducted in 1996 and 1997. The seismometers were deployed in three semi-circular arrays with apertures...
Direct numerical simulation of bedload transport using a local, dynamic boundary condition
M.W. Schmeeckle, J. M. Nelson
2003, Sedimentology (50) 279-301
Temporally and spatially averaged models of bedload transport are inadequate to describe the highly variable nature of particle motion at low transport stages. The primary sources of this variability are the resisting forces to downstream motion resulting from the geometrical relation (pocket friction angle) of a bed grain to the...
Simulating ground water-lake interactions: Approaches and insights
R. J. Hunt, H.M. Haitjema, J. T. Krohelski, D. T. Feinstein
2003, Ground Water (41) 227-237
Approaches for modeling lake-ground water interactions have evolved significantly from early simulations that used fixed lake stages specified as constant head to sophisticated LAK packages for MODFLOW. Although model input can be complex, the LAK package capabilities and output are superior to methods that rely on a fixed lake stage...
Effects of water level, shade and time on germination and growth of freshwater marsh plants along a simulated successional gradient
C.H. Kellogg, S.D. Bridgham, S. A. Leicht
2003, Journal of Ecology (91) 274-282
1. We examined the effect of soil organic content (1.4, 3.6, 7.2% soil C), water level (+2, -1, -4 cm from soil surface) and duration (13 or 33 days) on 10 species that varied in abundance during succession in freshwater marshes. We also determined the effect of shade (0, 40,...
Competition between Asian pink salmon (Oncorhynchus gorbuscha) and Alaskan sockeye salmon (O. nerka) in the North Pacific Ocean
G.T. Ruggerone, M. Zimmermann, K.W. Myers, J.L. Nielsen, D.E. Rogers
2003, Fisheries Oceanography (12) 209-219
The importance of interspecific competition as a mechanism regulating population abundance in offshore marine communities is largely unknown. We evaluated offshore competition between Asian pink salmon and Bristol Bay (Alaska) sockeye salmon, which intermingle in the North Pacific Ocean and Bering Sea, using the unique biennial abundance cycle of Asian...
Response of benthic foraminifers to sewage discharge and remediation in Santa Monica Bay, California
M. McGann, C. R. Alexander, S.M. Bay
2003, Marine Environmental Research (56) 299-342
Examination of a time series of foraminiferal assemblage distributions on the continental shelf and slope of Santa Monica Bay from 1955 to 1997-1998 suggests that the benthic microfauna have been greatly affected by the quality and character of the municipal sludge and wastewater discharged into the bay over the last...
Bedded jaspers of the Ordovician Løkken ophiolite, Norway: seafloor deposition and diagenetic maturation of hydrothermal plume-derived silica-iron gels
Tor Grenne, John F. Slack
2003, Mineralium Deposita (38) 625-639
Sedimentary beds of jasper (red hematitic chert) in the Ordovician Løkken ophiolite of Norway are closely associated with volcanogenic massive sulphide (VMS) deposits. The jaspers occur in the immediate hangingwall and laterally peripheral to the large Løkken (25–30 Mt) and small Høydal (0.1 Mt) VMS deposits, and are exposed discontinuously for...
Density of the continental roots: Compositional and thermal contributions
M.K. Kaban, P. Schwintzer, I.M. Artemieva, Walter D. Mooney
2003, Earth and Planetary Science Letters (209) 53-69
The origin and evolution of cratonic roots has been debated for many years. Precambrian cratons are underlain by cold lithospheric roots that are chemically depleted. Thermal and petrologic data indicate that Archean roots are colder and more chemically depleted than Proterozoic roots. This observation has led to the hypothesis that...
Fish biliary PAH metabolites estimated by fixed-wavelength fluorescence as an indicator of environmental exposure and effects
X. Yang, D.S. Peterson, P. C. Baumann, E.L.C. Lin
2003, Journal of Great Lakes Research (29) 116-123
Biliary polynuclear aromatic hydrocarbon (PAH) metabolites have been studied since the mid 1980s as an indicator of exposure of fish to PAHs. However, the measurements of PAH metabolites are often costly and time-consuming. A simple and rapid method, fixed-wavelength fluorescence (FF), was used to measure the concentrations of benzo(a)pyrene (B[a]P)-type...
Development of hardwood seed zones for Tennessee using a geographic information system
L.S. Post, S.E. Schlarbaum, F. Van Manen, R.A. Cecich, A.M. Saxton, J.F. Schneider
2003, Southern Journal of Applied Forestry (27) 172-175
For species that have no or limited information on genetic variation and adaptability to nonnative sites, there is a need for seed collection guidelines based on biological, climatological, and/or geographical criteria. Twenty-eight hardwood species are currently grown for reforestation purposes at the East Tennessee State Nursery. The majority of these...
A triangular model of dimensionless runoff producing rainfall hyetographs in Texas
W.H. Asquith, J.R. Bumgarner, L.S. Fahlquist
2003, Journal of the American Water Resources Association (39) 911-921
A synthetic triangular hyetograph for a large data base of Texas rainfall and runoff is needed. A hyetograph represents the temporal distribution of rainfall intensity at a point or over a watershed during a storm. Synthetic hyetographs are estimates of the expected time distribution for a design storm and principally...
Temporal connectivity in a prairie pothole complex
S.G. Leibowitz, K.C. Vining
2003, Wetlands (23) 13-25
A number of studies have noted the occurrence of intermittent surface-water connections between depressional wetlands in general and prairie potholes in particular. Yet, the ecological implications of such connections remain largely unexplored. In 1995, we observed spillage into and out of a North Dakota wetland during two field visits. Between...
Detailed fault structure of the 2000 Western Tottori, Japan, earthquake sequence
E. Fukuyama, W.L. Ellsworth, F. Waldhauser, A. Kubo
2003, Bulletin of the Seismological Society of America (93) 1468-1478
We investigate the faulting process of the aftershock region of the 2000 western Tottori earthquake (Mw 6.6) by combining aftershock hypocenters and moment tensor solutions. Aftershock locations were precisely determined by the double difference method using P- and S-phase arrival data of the Japan Meteorological Agency unified catalog. By combining...
Movement and habitat use by radio-tagged paddlefish in the upper Mississippi River and tributaries
S. J. Zigler, M. R. Dewey, B.C. Knights, A.L. Runstrom, M.T. Steingraeber
2003, North American Journal of Fisheries Management (23) 189-205
We used radio telemetry to evaluate the movement and habitat use of paddlefish Polyodon spathula in the upper Mississippi River and two tributary rivers. Radio transmitters were surgically implanted into 71 paddlefish in Navigation Pools 5A and 8 of the upper Mississippi River, the Chippewa River, and the Wisconsin River...
White paper on post-fire effects, including physical and biological
M.L. Brooks, S.H. Cannon, N.B. Kotliar
2003, Book chapter
No abstract available at this time...
Managed forest reserves: preserving diversity
John Tappeiner, Nathan Poage, Janet L. Erickson
2003, Fact Sheet 034-03
<span data-sheets-value="{"1":2,"2":"Background\n\nAs part of the Northwest Forest Plan, large areas have been designated on many federal forests in western Oregon to provide critical habitat for plants and animals that are associated with old-growth habitat. Some of the structural characteristics often considered typical of old forests include large-diameter overstory trees, large...
Fire and exotics in the Mojave Desert: An irreversible change? A state-transition model for blackbrush (Coleogyne ramosissima) habitat
D.F. Haines, T. C. Esque, L.A. DeFalco, S.J. Scoles, M.L. Brooks, R. H. Webb
2003, Book chapter, SIR 2004-2005
No abstract available at this time...
Debris-flow initiation from large, slow-moving landslides
M.E. Reid, D.L. Brien, R.G. LaHusen, J. J. Roering, J. de la Fuente, S. D. Ellen
D. Rickenmann, Chiu-Lan Chen, editor(s)
2003, Conference Paper, International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings
In some mountainous terrain, debris flows preferentially initiate from the toes and margins of larger, deeper, slower-moving landslides. During the wet winter of 1997, we began real-time monitoring of the large, active Cleveland Corral landslide complex in California, USA. When the main slide is actively moving, small, shallow, first-time slides...
Mycorrhizal colonization across hydrologic gradients in restored and reference freshwater wetlands
C.R. Bauer, C.H. Kellogg, S.D. Bridgham, G. A. Lamberti
2003, Wetlands (23) 961-968
Arbuscular mycorrhizae, which are plant root-fungal symbioses, are common associates of vascular plants. Such relationships, however, are thought to be rare in wetland plant roots, although several recent studies suggest that arbuscular mycorrhizae may be important in wetland ecosystems. Our objectives were to determine (1) the level of arbuscular mycorrhizal...
Incubation behaviour of Greater Scaup Aythya marila on the Yukon-Kuskokwim Delta, Alaska
Paul L. Flint
2003, Wildfowl (54) 71-79
This study examined the incubation behaviour of Greater Scaup Aythya marila on the Yukon-Kuskokwim Delta, Alaska. The goals of the study were to describe the incubation behaviour of Greater Scaup in terms of incubation constancy, recess frequency and recess length. The use of endogenous reserves by Greater Scaup was examined...
Salton Sea
Milton Friend
Shepard Krech III, John R. McNeill, Carolyn Merchant, editor(s)
2003, Book chapter, Encyclopedia of world environmental history
No abstract available....
The Role of stocking in the reestablishment and augmentation of native fish in the Lower Colorado River mainstream (1998-2002)
Gordon Mueller
2003, Open-File Report 2003-288
The Colorado River has experienced dramatic physical and biological change. Rated as the fifth largest river in the USA by volume, today its waters seldom reach the sea. Water diversions gradually reduce its flow to a point where its last remaining waters are diverted at Morales Dam leaving nearly 100...
Historical fire regime in southern California
Jon E. Keeley, Connie J. Fotheringham
2003, Fire Management Today (63) 8-9
The historical variability in fire regime is a conservative indicator of ecosystem sustainability. Understanding the natural role of fire in chaparral ecosystems is therefore necessary for effective fire management....
Nontarget bird exposure to DRC-1339 during fall in North Dakota and spring in South Dakota
Thomas W. Custer, Christine M. Custer, Paul M. Dummer, George M. Linz, Louis Sileo, Randal S. Stahl, John J. Johnston
G.M. Linz, editor(s)
2003, Book chapter, Management of North American Blackbirds
Blackbirds frequently use ripening sunflower (Heltantbus annuus) as a food source in the northern Great Plains. In 1999 and 2000, the avicide DRC-1339 (3-chloro-4-methylaniline hydrochloride) was used experimentally on fall-ripening sunflower fields in North Dakota so researchers could evaluate its effectiveness for reducing crop depredations by blackbirds. DRC-1339 was applied...
In situ determination of the annual thermal habitat use by lake trout (Salvelinus namaycush) in Lake Huron
Roger A. Bergstedt, Ray L. Argyle, James G. Seelye, Kim T. Scribner, Gary L. Curtis
2003, Journal of Great Lakes Research (29) 347-361
Records of the temperatures occupied by 33 lake trout (Salvelinus namaycush) at large in Lake Huron were obtained for up to 14 months per fish, at 75-minute intervals, from surgically implanted archival temperature tags. The dataset covered nearly three years, from October 1998 to June 2001, and included 160,000 observations....
