The cascading effects of fire exclusion in Rocky Mountain ecosystems
R.E. Keane, K.C. Ryan, T. Veblen, Craig D. Allen, J. Logan, B. Hawkes
Jill Baron, editor(s)
2002, Book chapter, Rocky Mountain futures: An ecological perspective
No abstract available....
Source properties of earthquakes near the Salton Sea triggered by the 16 October 1999 M 7.1 Hector Mine, California, earthquake
S. E. Hough, H. Kanamori
2002, Bulletin of the Seismological Society of America (92) 1281-1289
We analyze the source properties of a sequence of triggered earthquakes that occurred near the Salton Sea in southern California in the immediate aftermath of the M 7.1 Hector Mine earthquake of 16 October 1999. The sequence produced a number of early events that were not initially located by the...
Selenium biotransformations into proteinaceous forms by foodweb organisms of selenium-laden drainage waters in California
J.E. Spallholz, D. J. Hoffman
2002, Aquatic Toxicology (57) 65-84
Selenium contamination represents one of the few clear cases where environmental pollution has led to devastation of wildlife populations, most notably in agricultural drainage evaporation and power plant coal-fly ash receiving ponds. Complex biogeochemistry, in particular extensive biotransformations and foodchain transfer, governs Se ecotoxicology and toxicology, for which the mechanism(s)...
Effects of habitat fragmentation on passerine birds breeding in Intermountain shrubsteppe
Steven T. Knick, John Rotenberry
2002, Studies in Avian Biology (25) 130-140
No abstract available....
A compact high-resolution 3-D imaging spectrometer for discovering Oases on Mars
J. Ge, D. Ren, J. I. Lunine, R. H. Brown, R.V. Yelle, L.A. Soderblom
Hoover R.B.Rozanov A.Y.Paepe R.R., editor(s)
2002, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
A new design for a very lightweight, very high throughput reflectance sectrometer enabled by two new technologies being developed is presented. These new technologies include integral field unit optics to enable simultaneous imaging and spectroscopy at high spatial resolution with an infrared (IR) array, and silicon grisms to enable compact...
Effects of fire and post-fire salvage logging on avian communities in conifer-dominated forests of the western United States
N.B. Kotliar, S.J. Hejl, R.L. Hutto, V.A. Saab, Cynthia Melcher, M.E. McFadzen
2002, Conference Paper, Studies in Avian Biology
Historically, fire was one of the most widespread natural disturbances in the western United States. More recently, however, significant anthropogenic activities, especially fire suppression and silvicultural practices, have altered fire regimes; as a result, landscapes and associated communities have changed as well. Herein, we review current knowledge of how fire...
Residency and movement patterns of wintering dunlin in the Willamette Valley of Oregon
Peter M. Sanzenbacher, Susan M. Haig
2002, Condor (104) 271-280
In the winters of 1998–1999 and 1999–2000, we tracked 67 radio-marked Dunlin (Calidris alpina) throughout the complex agricultural landscape of the Willamette Valley of Oregon. Individual birds were tracked across 8-week sampling periods and indicated a high degree of regional fidelity throughout the three winter sampling periods. Birds exhibited varied...
Abundances of northwestern salamander larvae in montane lakes with and without fish, Mount Rainier National Park, Washington
Gary L. Larson, Robert L. Hoffman
2002, Northwest Science (76) 35-40
In Mount Rainier National Park, the northwestern salamander usually inhabits relatively large and deep lakes and ponds (average size = 0.3 ha; average depth > 2 m) that contain flocculent, organic bottom sediments and abundant coarse wood. Prior to 1970, salmonids were introduced into many of the park's lakes and...
Golden eagles in the U.S. and Canada: Status, trends, and conservation challenges
Michael N. Kochert, Karen Steenhof
2002, Journal of Raptor Research (36) 32-40
We reviewed the literature to assess status and population trends and to identify mortality factors affecting Golden Eagle populations in the U.S. and Canada. Nesting populations in Alaska and Canada are stable, but some nesting populations in the western U.S. have declined. Small but steady declines in the intermountain West have...
Development of a benthic macroinvertebrate index to assess biological integrity the Ohio River
J.M. Applegate, P. C. Baumann, E.E. Emery
2002, Conference Paper, Ohio Journal of Science
No abstract available at this time...
Response of old-growth conifers to reduction in stand density in western Oregon forests
P. Latham, J. C. Tappeiner II
2002, Tree Physiology (22) 137-146
The positive growth response of healthy young trees to density reduction is well known. In contrast, large old trees are usually thought to be intrinsically limited in their ability to respond to increased growing space; therefore, density reduction is seldom used in stands of old-growth trees. We tested the null...
Fish Health Indicators
V. S. Blazer, G.M. Dethloff, B. Wright
2002, Information and Technology Report USGS/BRD/ITR-2002-0004
No abstract available at this time...
Nitrogen loss from nonpolluted South American forests mainly via dissolved organic compounds
Steven S. Perakis, L. O. Hedin
2002, Nature (415) 416-419
Conceptual1,<a id="ref-link-section-d257630553e380" title="Aber, J. et al. Nitrogen saturation in temperate forest ecosystems: Hypotheses revisited. BioScience 48, 921–34 (1998)." href="https://www.nature.com/articles/415416a#ref-CR2" data-track="click" data-track-action="reference anchor"...
Sea otter studies in Glacier Bay National Park and Preserve
James L. Bodkin, Kimberly A. Kloecker, George G. Esslinger, Daniel H. Monson, J.D. DeGroot, J. Doherty
2002, Report
Following translocations to the outer coast of Southeast Alaska in 1965, sea otters have been expanding their range and increasing in abundance. We began conducting surveys for sea otters in Cross Sound, Icy Strait, and Glacier Bay, Alaska in 1994, following initial reports (in 1993) of their presence in Glacier...
Extirpations of grizzly bears in the contiguous United States of America, 1850-2000
David J. Mattson, Troy Merrill
2002, Conservation Biology (16) 1123-1136
We investigated factors associated with the distribution of grizzly bears (Ursus arctos horribilis) in 1850 and their extirpation during 1850–1920 and 1920–1970 in the contiguous United States. We used autologistic regression to describe relations between grizzly bear range in 1850, 1920, and 1970 and potential explanatory factors specified for a...
Space use, migratory connectivity, and population segregation among willets breeding in the western Great Basin
Susan M. Haig, Lewis W. Oring, Peter M. Sanzenbacher, Oriane W. Taft
2002, Condor (104) 620-630
Western Willets (Catoptrophorus semipalmatus inornatus) were banded (n = 146 breeding adults and chicks) and radio-marked (n = 68 adults) at three western Great Basin wetland complexes to determine inter- and intraseasonal space use and movement patterns (primarily in 1998 and 1999). Birds were then tracked to overwintering sites where...
Persistence of an unusual pelagic zooplankton assemblage in a clear, mountain lake
Gary L. Larson, Robert L. Hoffman, C. D. McIntire
2002, Hydrobiologia (468) 163-170
The planktonic zooplankton assemblage in Mowich Lake, Mount Rainier National Park (MORA), was composed almost entirely of rotifers in 1966 and 1967. Adult pelagic crustacean taxa were rare. Their paucity was attributed to predation by kokanee salmon (Oncorhynchus nerka), which had been stocked in 1961. During a park-wide survey of...
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....
Parental care in Tundra Swans during the pre-fledgling period
Susan L. Earnst
2002, Waterbirds (25) 268-277
Among studies that have quantified the care of precocial young, few have investigated forms of parental care other than vigilance. During the pre-fledging period, Tundra Swan (Cygnus columbianus columbianus) parents provided simultaneous biparental care by foraging near each other and their cygnets, and cygnets spent more time foraging during bouts...
Carbon dioxide emission rate of Kīlauea Volcano: Implications for primary magma and the summit reservoir
T.M. Gerlach, K.A. McGee, T. Elias, A. J. Sutton, M.P. Doukas
2002, Journal of Geophysical Research B: Solid Earth (107) ECV 3-1-ECV 3-15
We report a CO2 emission rate of 8500 metric tons per day (t d−1) for the summit of Kīlauea Volcano, several times larger than previous estimates. It is based on three sets of measurements over 4 years of synchronous SO2 emission rates and volcanic CO2/SO2concentration ratios for the summit correlation spectrometer (COSPEC)...
Identification of steelhead and resident rainbow trout progeny in the Deschutes River, Oregon, revealed with otolith microchemistry
Christian E. Zimmerman, G.H. Reeves
2002, Transactions of the American Fisheries Society (131) 986-993
Comparisons of strontium:calcium (Sr:Ca) ratios in otolith primordia and freshwater growth regions were used to identify the progeny of steelhead Oncorhynchus mykiss (anadromous rainbow trout) and resident rainbow trout in the Deschutes River, Oregon. We cultured progeny of known adult steelhead and resident rainbow trout to confirm the relationship between...
The utility of estimating net primary productivity over Alaska using baseline AVHRR data
C. J. Markon, Kim M. Peterson
2002, International Journal of Remote Sensing (23) 4571-4596
Net primary productivity (NPP) is a fundamental ecological variable that provides information about the health and status of vegetation communities. The Normalized Difference Vegetation Index, or NDVI, derived from the Advanced Very High Resolution Radiometer (AVHRR) is increasingly being used to model or predict NPP, especially over large remote areas....
Field evidence for a protistan role in an organically-contaminated aquifer
Nancy E. Kinner, Ronald W. Harvey, David M. Shay, David W. Metge, Alan Warren
2002, Environmental Science & Technology (36) 4312-4318
The association between protists, bacteria, and dissolved organic carbon (DOC) in an oxygen-depleted, 6 km-long wastewater contaminant plume within a sandy aquifer (Cape Cod, MA) was investigated by comparing abundance patterns along longitudinal and vertical transects and at a control site. Strong linear correlations were observed between unattached bacterial abundance...
Anaerobic methane oxidation in a landfill-leachate plume
Ethan L. Grossman, Luis A. Cifuentes, Isabelle M. Cozzarelli
2002, Environmental Science & Technology (36) 2436-2442
The alluvial aquifer adjacent to Norman Landfill, OK, provides an excellent natural laboratory for the study of anaerobic processes impacting landfill-leachate contaminated aquifers. We collected groundwaters from a transect of seven multilevel wells ranging in depth from 1.3 to 11 m that were oriented parallel to the flow path. The...
A review of bacterial methyl halide degradation: Biochemistry, genetics and molecular ecology
I.R. McDonald, K.L. Warner, C. McAnulla, C.A. Woodall, R.S. Oremland, J.C. Murrell
2002, Environmental Microbiology (4) 193-203
Methyl halide‐degrading bacteria are a diverse group of organisms that are found in both terrestrial and marine environments. They potentially play an important role in mitigating ozone depletion resulting from methyl chloride and methyl bromide emissions. The first step in the pathway(s) of methyl halide degradation...
