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Page 2862, results 71526 - 71550

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Not all publications have extents, not all extents are completely accurate
Effects of Holocene climate change on mercury deposition in Elk Lake, Minnesota: The importance of eolain transport in the mercury cycle
W.F. Cannon, W.E. Dean, J. H. Bullock
2003, Geology (31) 187-190
Sediments in Elk Lake, Minnesota, consist of 10,400 varve layers that provide a precise chronology for Holocene fluctuations in climate and biota recorded in the strata. Progressively greater concentrations and accumulation rates of mercury since ca. A.D. 1875 reflect deposition of anthropogenic mercury additions to the atmosphere. Within the Holocene record are numerous short intervals in which mercury concentrations and accumulation rates exceed the modern values. The highest mercury concentrations formed ca. 8 ka, coincident...
Influence of eastern hemlock (Tsuga canadensis L.) on fish community structure and function in headwater streams of the Delaware River basin
R. M. Ross, R. M. Bennett, C.D. Snyder, J.A. Young, D. R. Smith, D. P. Lemarie
2003, Ecology of Freshwater Fish (12) 60-65
Hemlock (Tsuga canadensis) forest of the eastern U.S. are in decline due to invasion by the exotic insect hemlock woolly adelgid (Adelges tsugae). Aquatic biodiversity in hemlock ecosystems has not been documented; thus the true impact of the infestation cannot be assessed. We compared ichthyofaunal assemblages and trophic structure of...
Interaction of lateral baroclinic forcing and turbulence in an estuary
J.R. Lacy, M.T. Stacey, J.R. Burau, Stephen G. Monismith
2003, Journal of Geophysical Research C: Oceans (108) 34-1
Observations of density and velocity in a channel in northern San Francisco Bay show that the onset of vertical density stratification during flood tides is controlled by the balance between the cross-channel baroclinic pressure gradient and vertical mixing due to turbulence. Profiles of velocity, salinity, temperature, and suspended sediment concentration...
Epizootiology and histopathology of Parvicapsula sp. in coho salmon Oncorhynchus kisutch
William T. Yasutake, Diane G. Elliott
2003, Diseases of Aquatic Organisms (56) 215-221
The epizootiology and histopathology of the myxosporean Parvicapsula sp. was studied during monthly health surveys of 4 groups of coho salmon Oncorhynchus kisutch at a commercial farm in Puget Sound, Washington, USA, from 1984 to 1986. No Parvicapsula sp. was detected in histological samples taken from juvenile fish in fresh water, but the parasite was detected...
Analysis of potential debris flow source areas on Mount Shasta, California, by using airborne and satellite remote sensing data
J.K. Crowley, B.E. Hubbard, J.C. Mars
2003, Remote Sensing of Environment (87) 345-358
Remote sensing data from NASA's Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) and the first spaceborne imaging spectrometer, Hyperion, show hydrothermally altered rocks mainly composed of natroalunite, kaolinite, cristobalite, and gypsum on both the Mount Shasta and Shastina cones. Field observations indicate that much of the visible altered rock consists of talus...
Patterns and processes of population change in selected nearshore vertebrate predators
James L. Bodkin, Brenda E. Ballachey, T.A. Dean, Daniel Esler
2003, Report, EVOS Restoration Project 423 Final Report
Sea otters and harlequin ducks have not fully recovered from the oil spill. This project will explore links between oil exposure and the lack of population recovery, with the intent of understanding constraints to recovery of these species and the nearshore environment. In FY 02, sea otter work will include...
Possible Juventae Chasma subice volcanic eruptions and Maja Valles ice outburst floods on Mars: Implications of Mars Global surveyor crater densities, geomorphology, and topography
M. G. Chapman, M.T. Gudmundsson, A.J. Russell, T.M. Hare
2003, Journal of Geophysical Research E: Planets (108) 2-1
This article discusses image, topographic, and spectral data from the Mars Global Surveyor (MGS) mission that provide new information concerning the surface age, geomorphology, and topography of the Juventae Chasma/Maja Valles system. Our study utilizes data from two instruments on board MGS: images from the Mars Orbiter Camera (MOC) and...
Update COSEWIC status report on the shortjaw cisco, Coregonus zenithicus, in Canada
Thomas N. Todd
2003, Report, COSEWIC assessment and update status report on the shortjaw cisco Coregonus zenithicus in Canada
Extirpated in most of the Great Lakes, the shortjaw cisco, Coregonus zenithicus, is currently found in Lakes Superior and Nipigon in addition to at least 22 Canadian lakes. The species exhibits morphological and genetic variability throughout its range and may consist of more than one distinct taxon. However, a common...
Lake Clark sockeye salmon population assessment
Carol Ann Woody, Kristina M. Ramstad, Daniel Young, G. Kevin Sage, Fred W. Allendorf
2003, Report
Radio telemetry was used to identify and map sockeye salmon spawning habitats in glacially influenced Lake Clark, Kvichak River watershed, Alaska. Two hundred eighty-two adult sockeye salmon were radio tagged and tracked to spawning grounds. Thirty-five spawning areas were identified, including 18 previously unidentified. Comparison of radio telemetry data with...
Monitoring in the nearshore: A process for making reasoned decisions
James L. Bodkin, T.A. Dean
2003, Report, EVOS Restoration Project 030687 Final Report
Over the past several years, a conceptual framework for the GEM nearshore monitoring program has been developed through a series of workshops. However, details of the proposed monitoring program, e.g. what to sample, where to sample, when to sample and at how many sites, have yet to be determined. In...
Grizzly bear
C.C. Schwartz, S.D. Miller, M.A. Haroldson
G. Feldhamer, B. Thompson, J. Chapman, editor(s)
2003, Book chapter, Wild Mammals of North America.
The grizzly bear inspires fear, awe, and respect in humans to a degree unmatched by any other North American wild mammal. Like other bear species, it can inflict serious injury and death on humans and sometimes does. Unlike the polar bear (Ursus maritimus) of the sparsely inhabited northern arctic, however,...
Male Brown-headed Cowbird Attacks and Kills a Nestling
L.D. Igl
2003, The Wilson Bulletin (115) 210-212
I observed a male Brown-headed Cowbird (Molothrus ater) attack and kill a nestling of an unidentified passerine in a grassland field in Day County, South Dakota, in June 2000. The killing or removal of nestlings by female cowbirds has been reported by others, but this behavior has not been documented...
Community metabolism during early development of a restored wetland
J.E. McKenna Jr.
2003, Wetlands (23) 35-50
Productivity is an important ecological function of any natural system and may be quite high in wetlands. Restoration of productive wetlands may play a key role in re-establishing ecological function to portions of the vast areas of wetlands (roughly 86%) drained and otherwise altered in the United States over the...
Molecular-scale characterization of uranium sorption by bone apatite materials for a permeable reactive barrier demonstration
C. C. Fuller, J.R. Bargar, J.A. Davis
2003, Environmental Science & Technology (37) 4642-4649
Uranium binding to bone charcoal and bone meal apatite materials was investigated using U LIII-edge EXAFS spectroscopy and synchrotron source XRD measurements of laboratory batch preparations in the absence and presence of dissolved carbonate. Pelletized bone char apatite recovered from a permeable reactive barrier (PRB) at Fry...
Infrasonic tremor observed at Kilauea Volcano, Hawai'i
M. Garces, A. Harris, C. Hetzer, J. Johnson, S. Rowland, E. Marchetti, P. Okubo
2003, Geophysical Research Letters (30)
[1] Infrasonic array data collected at Kīlauea Volcano, Hawai'i, during November 12–21, 2002 indicate that the active vents and lava tube system near the Pu'u 'Ō'ō vent complex emit almost continuous infrasound in the 0.3–10 Hz frequency band. The spectral content of these infrasonic signals matches well that of synchronous...
Synergistic effects of a combined exposure to herbicides and an insecticide in Hyla versicolor
L. Mazanti, D. W. Sparling, C. Rice, K. Bialek, C. Stevenson, B. Teels
Linder G.L.Krest S.Sparling D.Little E.E., editor(s)
2003, Conference Paper, ASTM Special Technical Publication
Combinations of the herbicides atrazine and metolachlor and the insecticide chlorpyrifos were tested under both laboratory and field conditions to determine their individual and combined effects on amphibian populations. In the lab Hyla versicolor tadpoles experienced 100% mortality when exposed to a high combination of the pesticides (2.0 mg/L atrazine,...