Nitrogen and phosphorus transport between Fourleague Bay, LA, and the Gulf of Mexico: The role of winter cold fronts and Atchafalaya River discharge
B.C. Perez, J.W. Day Jr., D. Justic, R.R. Twilley
2003, Estuarine, Coastal and Shelf Science (57) 1065-1078
Nutrient fluxes were measured between Fourleague Bay, a shallow Louisiana estuary, and the Gulf of Mexico every 3 h between February 1 and April 30, 1994 to determine how high velocity winds associated with cold fronts and peak Atchafalaya River discharge influenced transport. Net water fluxes were ebb-dominated throughout the...
The economics of protecting tiger populations: Linking household behavior to poaching and prey depletion
R. Damania, R. Stringer, K. U. Karanth, B. Stith
2003, Land Economics (79) 198-216
The tiger (Panthera tigris) is classified as endangered and populations continue to decline. This paper presents a formal economic analysis of the two most imminent threats to the survival of wild tigers: poaching tigers and hunting their prey. A model is developed to examine interactions between tigers and farm households...
Exposed water ice discovered near the south pole of Mars
Timothy N. Titus, Hugh H. Kieffer, Phillip R. Christensen
2003, Science (299) 1048-1051
The Mars Odyssey Thermal Emission Imaging System (THEMIS) has discovered water ice exposed near the edge of Mars' southern perennial polar cap. The surface H2O ice was first observed by THEMIS as a region that was cooler than expected for dry soil at that latitude during the summer season. Diurnal...
Landslides and liquefaction triggered by the M 7.9 denali fault earthquake of 3 November 2002
E. L. Harp, R.W. Jibson, R. E. Kayen, D. K. Keefer, B.L. Sherrod, G. A. Carver, B.D. Collins, R.E.S. Moss, N. Sitar
2003, GSA Today (13) 4-10
The moment magnitude (M) 7.9 Denali Fault earthquake in Alaska of 3 November 2002 triggered an unusual pattern of landslides and liquefaction effects. The landslides were primarily rock falls and rock slides that ranged in volume from a few cubic meters to the 40 million-cubic-meter rock avalanche that covered much...
Gyrfalcon diet in central west Greenland during the nestling period
Travis Booms, Mark R. Fuller
2003, The Condor (105) 528-537
We studied food habits of Gyrfalcons (Falco rusticolus) nesting in central west Greenland in 2000 and 2001 using three sources of data: time-lapse video (3 nests), prey remains (22 nests), and regurgitated pellets (19 nests). These sources provided different information describing the diet during the nesting period. Gyrfalcons relied heavily...
Morphology and composition of spinel in Pu'u 'O'o lava (1996-1998), Kilauea volcano, Hawaii
P.L. Roeder, C. Thornber, Alexei Poustovetov, A. Grant
2003, Journal of Volcanology and Geothermal Research (123) 245-265
The morphology and composition of spinel in rapidly quenched Pu'u 'O'o vent and lava tube samples are described. These samples contain glass, olivine phenocrysts (3-5 vol.%) and microphenocrysts of spinel (~0.05 vol.%). The spinel surrounded by glass occurs as idiomorphic octahedra 5-50 μm in diameter and as chains of octahedra...
A voluntary program to curtail boat disturbance to waterfowl during migration
K.P. Kenow, C. E. Korschgen, J.M. Nissen, A. Elfessi, R. Steinbach
2003, Waterbirds (26) 77-87
A voluntary waterfowl avoidance area (VWAA) was established on Lake Onalaska in Navigation Pool 7 of the Upper Mississippi River, Wisconsin, USA, in 1986, to reduce boating disturbance to migratory waterfowl. We monitored boater compliance with the VWAA program in 1993 and 1997. Of 1,664 "boating events" observed on Lake...
Seasonal and longitudinal homogeneity of suspended sediment in San Francisco Bay, California
D. H. Schoellhamer, N. K. Ganju, J. W. Gartner, M.C. Murrell, S.A. Wright
2003, Conference Paper, Proceedings of the 17th Biennial Conference of the Estuarine Research Federation
No abstract available....
Desalinization, erosion, and tidal changes following the breaching of Napa salt pond 3
K. M. Swanson, G.G. Shellenbarger, D. H. Schoellhamer, N. K. Ganju, N.D. Athearn, P.A. Buchanan
2003, Conference Paper, Proceedings of the 6th biennial State-of-the-Estuary Conference
No abstract available....
Planktonic marine diatom record of the past 18 m.y.: Appearances and extinctions in the Pacific and Southern Oceans
J.A. Barron
2003, Diatom Research (18) 203-224
Recently published diatom biochronologies provide accurate (to 0.1 m.y.) determination of the ages of appearances and disappearances of planktonic diatoms during the past 18 m.y. in the equatorial Pacific, North Pacific, and Southern Ocean. Comparisons of these records reveal the age of evolutionary appearance and extinction of species and their...
Characterization of anthropogenic and natural sources of acid rock drainage at the Cinnamon Gulch abandoned mine land inventory site, Summit County, Colorado
D.A. Bird
2003, Environmental Geology (44) 919-932
Colorado's Cinnamon Gulch releases acid rock drainage (ARD) from anthropogenic and natural sources. In 2001, the total discharge from Cinnamon Gulch was measured at 1.02 cfs (29 L/s) at base flow and 4.3 cfs (122 L/s) at high flow (spring runoff). At base flow, natural sources account for 98% of...
Accumulation, release, and solubility of arsenic, molybdenum, and vanadium in wetland sediments
P.M. Fox, H.E. Doner
2003, Journal of Environmental Quality (32) 2428-2435
This study was undertaken to determine the fate of As, Mo, and V (trace elements, TEs) in the sediments of a constructed wetland in use for the remediation of potentially toxic trace element–contaminated agricultural drainwater. After three years of wetland operation, sediment cores were collected to determine changes in TE...
Rockfall hazard and risk assessment in the Yosemite Valley, California, USA
F. Guzzetti, P. Reichenbach, G. F. Wieczorek
2003, Natural Hazards and Earth System Sciences (3) 491-503
Rock slides and rock falls are the most frequent types of slope movements in Yosemite National Park, California. In historical time (1857-2002) 392 rock falls and rock slides have been documented in the valley, and some of them have been mapped in detail. We present the results of an attempt...
Simulation of unsteady flow and solute transport in a tidal river network
X. Zhan
2003, Engineering Computations (Swansea, Wales) (20) 754-767
A mathematical model and numerical method for water flow and solute transport in a tidal river network is presented. The tidal river network is defined as a system of open channels of rivers with junctions and cross sections. As an example, the Pearl River in China is represented by a...
In praise of mechanistically-rich models
Donald L. DeAngelis, Wolf M. Mooij
Charles D. Canham, Jonathan J. Cole, William K. Lauenroth, editor(s)
2003, Book chapter, Models in ecosystem scienc
Quantitative models are crucial to almost every area of ecosystem science. They provide a logical structure that guides and informs empirical observations of ecosystem processes. They play a particularly crucial role in synthesizing and integrating our understanding of the immense diversity of ecosystem structure and function. Increasingly, models are being...
Continuous monitoring of suspended sediment discharge in rivers by use of optical backscatterance sensors
D. H. Schoellhamer, S.A. Wright
2003, Book chapter, Erosion and sediment transport measurement: Technological and methodological advances: International Association for Hydrological Science Publication 283
No abstract available....
Influence of landscape structure and climate variability on a late holocene plant migration
M.E. Lyford, S.T. Jackson, J.L. Betancourt, S.T. Gray
2003, Ecological Monographs (73) 567-583
We analyzed and radiocarbon-dated 205 fossil woodrat middens from 14 sites in central and northern Wyoming and adjacent Utah and Montana to document spatiotemporal patterns of Holocene invasion by Utah juniper (Juniperus osteosperma). Holocene migration into central and northern Wyoming and southern Montana from the south proceeded by a series...
An evaluation of sediment rating curves for estimating suspended sediment concentrations for subsequent flux calculations
A. J. Horowitz
2003, Hydrological Processes (17) 3387-3409
In the absence of actual suspended sediment concentration (SSC) measurements, hydrologists have used sediment rating (sediment transport) curves to estimate (predict) SSCs for subsequent flux calculations. Various evaluations of the sediment rating-curve method were made using data from long-term, daily sediment-measuring sites within large (>1 000 000 km2), medium (<1...
High precision earthquake locations reveal seismogenic structure beneath Mammoth Mountain, California
Stephanie G. Prejean, Anna Stork, William L. Ellsworth, David Hill, Bruce R. Julian
2003, Geophysical Research Letters (30)
In 1989, an unusual earthquake swarm occurred beneath Mammoth Mountain that was probably associated with magmatic intrusion. To improve our understanding of this swarm, we relocated Mammoth Mountain earthquakes using a double difference algorithm. Relocated hypocenters reveal that most earthquakes occurred on two structures, a near-vertical plane at 7–9 km...
The Oligochaeta (Annelida, Clitellata) of the St. Lawrence Great Lakes region: An update
Douglas R. Spencer, Patrick L. Hudson
2003, Journal of Great Lakes Research (29) 89-104
An updated oligochaete species list for the Great Lakes region is provided. The list was developed through the reexamination of the taxa reported in a previous report in 1980, addition of new taxa or records collected from the region since 1980, and an update of taxonomy commensurate with systematic and...
Status and distribution of the least Bell's vireo and southwestern willow flycatcher at the Cleveland National Forest in 2002
B. Kus, D. Evans, B. Langan, M.B. Mulrooney
2003, Report
No abstract available at this time...
Sea lamprey abundance and management in Lake Superior 1957-1999
John W. Heinrich, Katherine M. Mullett, Michael J. Hansen, Jean V. Adams, Gerald T. Klar, David A. Johnson, Gavin C. Christie, Robert J. Young
2003, Journal of Great Lakes Research (29) 566-583
The international sea lamprey (Petromyzon marinus) control program successfully laid the foundation for rehabilitation of lake trout (Salvelinus namaycush) in Lake Superior and was well coordinated among management agencies during 1957–1999. The lampricide TFM was the primary control tool, with recurring treatments in 52 larval-producing streams. Barriers and sterile-male-release, as...
Passage of four teleost species prior to sea lamprey (Petromyzon marinus) migration in eight tributaries of Lake Superior, 1954-1979
Gregory L. Klinger, Jean V. Adams, John W. Heinrich
2003, Journal of Great Lakes Research (29) 403-409
Seasonally operated barriers in rivers are used by the Great Lakes Fishery Commission to block adult sea lamprey (Petromyzon marinus) migrations, yet pass other fish during some part of the year. Knowledge of the overlap of spawning migrations of sea lampreys and other fish species are vital for the efficient...
The sterile-male-release technique in Great Lakes sea lamprey management
Michael B. Twohey, John W. Heinrich, James G. Seelye, Kim T. Fredricks, Roger A. Bergstedt, Cheryl A. Kaye, Ron J. Scholefield, Rodney B. McDonald, Gavin C. Christie
2003, Journal of Great Lakes Research (29) 410-423
The implementation of a sterile-male-release technique from 1991 through 1999 and evaluation of its effectiveness in the Great Lakes sea lamprey (Petromyzon marinus) management program is reviewed. Male sea lampreys were injected with the chemosterilant bisazir (P,P-bis(1-aziridinyl)-N-methylphosphinothioic amide) using a robotic device. Quality assurance testing indicated the device delivered a...
Use of selection indices to model the functional response of predators
D.O. Joly, B.R. Patterson
2003, Ecology (84) 1635-1639
The functional response of a predator to changing prey density is an important determinant of stability of predatora??prey systems. We show how Manly's selection indices can be used to distinguish between hyperbolic and sigmoidal models of a predator functional response to primary prey density in the presence of alternative prey....
