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...
Volatiles in basaltic glasses from a subglacial volcano in northern British Columbia (Canada): Implications for ice sheet thickness and mantle volatiles
J.E. Dixon, J.R. Filiberto, J.G. Moore, C.J. Hickson
2002, Geological Society Special Publication 255-271
Dissolved H2O, CO2, S and Cl concentrations were measured in glasses from Tanzilla Mountain, a 500 m-high, exposed subglacial volcano from the Tuya-Teslin region, north central British Columbia, Canada. The absence of a flat-topped subaerial lava cap and the dominance of pillows and pillow breccias imply that the Tanzilla Mountain...
Seismological evidence for a sub-volcanic arc mantle wedge beneath the Denali volcanic gap, Alaska
D.E. McNamara, M.E. Pasyanos
2002, Geophysical Research Letters (29) 61-1-61-4
Arc volcanism in Alaska is strongly correlated with the 100 km depth contour of the western Aluetian Wadati-Benioff zone. Above the eastern portion of the Wadati-Benioff zone however, there is a distinct lack of volcanism (the Denali volcanic gap). We observe high Poisson's ratio values (0.29-0.33) over the entire length...
The endemic headwater stream amphibians of the American Northwest: Associations with environmental gradients in a large forested preserve
M. J. Adams, R. Bruce Bury
2002, Global Ecology and Biogeography (11) 169-178
We used a large forested preserve (Olympic National Park, USA) to examine the habitat associations of a unique and environmentally sensitive stream amphibian fauna: Ascaphus truei Stegneger, Rhyacotriton olympicus (Gaige) and Dicamptodon copei Nussbaum. We quantified the relative abundance of stream amphibians and compared them to physical, topographic, climatic and...
A comparison of models for estimating the riverine export of nitrogen from large watersheds
R. B. Alexander, P.J. Johnes, E.W. Boyer, R. A. Smith
2002, Biogeochemistry (57-58) 295-339
We evaluated the accuracy of six watershed models of nitrogen export in streams (kg km2 yr-1) developed for use in large watersheds and representing various empirical and quasi-empirical approaches described in the literature. These models differ in their methods of calibration and have varying levels of spatial resolution and process...
Terrestrial and stream amphibians across clearcut-forest interfaces in the Siskiyou Mountains, Oregon
Roman Biek, L. Scott Mills, R. Bruce Bury
2002, Northwest Science (76) 129-140
Timber harvest in the Pacific Northwest has resulted in a highly fragmented landscape. but there is no information on responses of amphibians to forest edges for this region. We investigated abundance of terrestrial and stream-dwelling amphibians on the interface of recent clearcuts and mature forest in the Siskiyou Mountains, Oregon,...
Conventional U-Pb dating versus SHRIMP of the Santa Barbara Granite Massif, Rondonia, Brazil
I. Sparrenberger, Jorge S. Bettencourt, R. M. Tosdal, J. L. Wooden
2002, Geologia USP - Serie Cientifica (2) 79-94
The Santa Ba??rbara Granite Massif is part of the Younger Granites of Rondo??nia (998 - 974 Ma) and is included in the Rondo??nia Tin Province (SW Amazonian Craton). It comprises three highly fractionated metaluminous to peraluminous within-plate A-type granite units emplaced in older medium-grade metamorphic rocks. Sn-mineralization is closely associated...
Velocity and Sediment Concentration Measurements over Bedforms in Sand-Bed Rivers
Robert R. Holmes Jr., M.H. Garcia
Wahl T.L.Pugh C.A.Oberg K.A.Vermeyen T.B.Wahl T.L.Pugh C.A.Oberg K.A.Vermeyen T.B., editor(s)
2002, Conference Paper, Hydraulic Measurements and Experimental Methods
Bedforms often are present on the bed of alluvial sand-bed rivers. Bedforms, such as dunes, impact the flow field. In this field study, velocity and suspended-sediment concentration measurements were made longitudinally along a dune field in large (5-15 meters deep) alluvial sand-bed rivers. The velocity and suspended-sediment concentration data was...
Fragmentation: Is the message clear?
J.A. Bissonette, Ilse Storch
2002, Ecology and Society (6)
In this paper, we briefly discuss some of the fundamental problems arising from the inherent complexity of larger-scale ecological systems. We examine the tenuous assumption of a direct correspondence between ecological data and theory, we comment on a recent report that evaluated the efficacy of fragmentation experiments, and we briefly...
Diversion of meltwater from Kautz Glacier initiates small debris flows near Van Trump Park, Mount Rainier, Washington
James W. Vallance, Carolyn L. Driedger, William E. Scott
2002, Washington Geology (30) 17-19
No abstract available....
Survival of Columbian white-tailed deer in western Oregon
Mark A. Ricca, Robert G. Anthony, Dewaine H. Jackson, Scott A. Wolfe
2002, Journal of Wildlife Management (66) 1255-1266
Columbian white-tailed deer (Odocoileus virginianus leucurus; CWTD) are an endangered subspecies on which little demographic information exists. We determined survival rates and causes of mortality for 64 radiocol- lared adults from 1996 to 1998, and for 63 radiocollared neonatal fawns during the summer and fall months of 1996-2001 in Douglas...
Rocky Mountain futures: An ecological perspective
Jill Baron, editor(s)
2002, Book
The Rocky Mountain West is largely arid and steep, with ecological scars from past human use visible for hundreds of years. Just how damaging were the past 150 years of activity? How do current rates of disturbance compare with past mining, grazing, and water diversion activities? In the face of...
Did Nile flooding sink two ancient cities?
R. Said
2002, Nature (415) 37-38
[No abstract available]...
Modelling postfledging survival and age- specific breeding probabilities in species with delayed maturity: A case study of Roseate Terns at Falkner Island, Connecticut
J. A. Spendelow, J.D. Nichols, J.E. Hines, J.D. Lebreton, R. Pradel
2002, Journal of Applied Statistics (29) 385-405
We modelled postfledging survival and age-specific breeding probabilities in endangered Roseate Terns (Sterna dougallii) at Falkner Island, Connecticut, USA using capture-recapture data from 1988-1998 of birds ringed as chicks and as adults. While no individuals bred as 2-year-olds during this period, about three-quarters of the young that survived and returned...
Land cover
Janet C. Jorgenson, Peter C. Joria, David C. Douglas
David C. Douglas, Patricia E. Reynolds, E. B. Rhode, editor(s)
2002, Biological Science Report 2002-0001-2
Documenting the distribution of land-cover types on the Arctic National Wildlife Refuge coastal plain is the foundation for impact assessment and mitigation of potential oil exploration and development. Vegetation maps facilitate wildlife studies by allowing biologists to quantify the availability of important wildlife habitats, investigate the relationships between animal locations...
Introduction
David C. Douglas, Patricia E. Reynolds, E. B. Rhode, editor(s)
2002, Biological Science Report 2002-0001-1
The Arctic National Wildlife Refuge in northeastern Alaska is one of 16 refuges in Alaska and 539 refuges nationwide within the National Wildlife Refuge System administered by the U.S. Fish and Wildlife Service. First established as the Arctic National Wildlife Range in 1960 by Public Land Order 2214, it initially...
First record of a Greater Shearwater (Puffinus gravis) in Alaska
John M. Pearce
2002, Western Birds (33) 121-122
The Greater Shearwater (Puffinus gravis) breeds in the southern Atlantic Ocean and disperses after breeding to the North Atlantic. On 3 August 2001, I observed and photographed an unidentified shearwater (Figure 1) in the Gulf of Alaska, about 30 km off the southern coast of Montague Island (59°50' N, 148°00'...
Abundance: Population size and density estimation
Mark S. Udevitz, William R. Gould
Abdel H. El-Shaarawi, Walter W. Piegorsch, editor(s)
2002, Book chapter, Encyclopedia of Environmetrics, volume 1
Estimates of population size (total number of individuals) or density (number of individuals per unit area) are some of the most basic requirements for wildlife research and management. This article provides a brief overview of approaches for wildlife population estimation. These include habitat-based approaches such as quadrat, line intercept,...
Population genetic structure in Lahontan cutthroat trout
Jennifer L. Nielsen, George K. Sage
2002, Transactions of the American Fisheries Society (131) 376-388
We used 10 microsatellite loci to examine the genetic population structure of cutthroat trout Oncorhynchus clarki within the Lahontan Basin complex. Genetic diversity was analyzed for trout from Nevada, California, and Utah representing three putative subspecies: Lahontan O. c. henshawi, Paiute O. c. seleniris, and Humboldt (an unnamed subspecies) cutthroat...
Comparative contaminant toxicity: Are amphibian larvae more sensitive than fish?
C.M. Bridges, F.J. Dwyer, D.K. Hardesty, D.W. Whites
2002, Bulletin of Environmental Contamination and Toxicology (69) 562-569
No abstract available....
The porcupine caribou herd
Brad Griffith, David C. Douglas, Noreen E. Walsh, Donald D. Young, Thomas R. McCabe, Donald E. Russell, Robert G. White, Raymond D. Cameron, Kenneth R. Whitten
David C. Douglas, Patricia E. Reynolds, E. B. Rhode, editor(s)
2002, Biological Science Report 2002-0001-3
Documentation of the natural range of variation in ecological, life history, and physiological characteristics of caribou (Rangifer tarandus) of the Porcupine caribou herd is a necessary base for detecting or predicting any potential effects of industrial development on the performance (e.g., distribution, demography, weight-gain of individuals) of the herd. To...
American white pelican soaring flight times and altitudes relative to changes in thermal depth and intensity
H.D. Shannon, G.S. Young, M. Yates, Mark R. Fuller, W. Seegar
2002, The Condor (104) 679-683
We compared American White Pelican (Pelecanus erythrorhynchos) soaring flight times and altitudes to model-produced estimates of thermal depth and intensity. These data showed that pelican soaring flight was confined to the thermal layer, and that the vertical extent of the soaring flight envelope increased with increases in thermal depth. Pelicans...
Stratigraphy, geochronology, and accretionary terrane settings of two Bronson Hill arc sequences, northern New England
R. H. Moench, J. N. Aleinikoff
2002, Physics and Chemistry of the Earth (27) 47-95
The Ammonoosuc Volcanics, Partridge Formation, and the Oliverian and Highlandcroft Plutonic Suites of the Bronson Hill anticlinorium (BHA) in axial New England are widely accepted as a single Middle to Late Ordovician magmatic arc that was active during closure of Iapetus. Mapping and U–Pb dating indicate, however, that the BHA...
Seismic evidence for a tilted mantle plume and north-south mantle flow beneath Iceland
Y. Shen, S.C. Solomon, I. Th Bjarnason, G. Nolet, W. J. Morgan, R. M. Allen, K. Vogfjord, S. Jakobsdottir, R. Stefansson, B.R. Julian, G.R. Foulger
2002, Earth and Planetary Science Letters (197) 261-272
Shear waves converted from compressional waves at mantle discontinuities near 410- and 660-km depth recorded by two broadband seismic experiments in Iceland reveal that the center of an area of anomalously thin mantle transition zone lies at least 100 km south of the upper-mantle low-velocity anomaly imaged tomographically beneath the...
The Emerson Lake Body: A link between the Landers and Hector Mine earthquakes, southern California, as inferred from gravity and magnetic anomalies
V.E. Langenheim, R.C. Jachens
2002, Bulletin of the Seismological Society of America (92) 1606-1620
Gravity and magnetic data indicate a mafic crustal heterogeneity that lies between the Hector Mine 16 October 1999 (Mw 7.1) and Landers 28 June 1992 (Mw 7.3) epicenters. The aftershocks and ruptures of these two events avoided the interior of the body. Two- and three-dimensional modeling of the potential-field anomalies...
