40Ar/39Ar dating of the eruptive history of Mount Erebus, Antarctica: Summit flows, tephra, and caldera collapse
C.J. Harpel, P.R. Kyle, R.P. Esser, W. C. McIntosh, D.A. Caldwell
2004, Bulletin of Volcanology (66) 687-702
Eruptive activity has occurred in the summit region of Mount Erebus over the last 95 ky, and has included numerous lava flows and small explosive eruptions, at least one plinian eruption, and at least one and probably two caldera-forming events. Furnace and laser step-heating 40Ar/39Ar ages have been determined for...
Origin of placer laurite from Borneo: Se and As contents, and S isotopic compositions
K.H. Hattori, L.J. Cabri, B. Johanson, M. L. Zientek
2004, Mineralogical Magazine (68) 353-368
We examined grains of the platinum-group mineral, laurite (RuS2), from the type locality, Pontyn River, Tanah Laut, Borneo, and from the Tambanio River, southeast Borneo. The grains show a variety of morphologies, including euhedral grains with conchoidal fractures and pits, and spherical grains with no crystal faces, probably because of...
From in-situ coal to fly ash: A study of coal mines and power plants from Indiana
Maria Mastalerz, J.C. Hower, A. Drobniak, S.M. Mardon, G. Lis
2004, International Journal of Coal Geology (59) 171-192
This paper presents data on the properties of coal and fly ash from two coal mines and two power plants that burn single-source coal from two mines in Indiana. One mine is in the low-sulfur (<1%) Danville Coal Member of the Dugger Formation (Pennsylvanian) and the other mines the high-sulfur...
Occurrence, size, and tag retention of sneaker male hatchery rainbow trout
J. Jeffery Isely, T.B. Grabowski
2004, North American Journal of Aquaculture (66) 234-236
One alternative reproductive tactic involving early-maturing, cryptic males is referred to as "sneaking." Although sneakers tend to be easily detectable upon close inspection, little is known about the proportion of a fish population consisting of sneakers. We examined 15,400 age-1 rainbow trout Oncorhynchus mykiss in a hatchery. Total length (mm),...
Response of desert biological soil crusts to alterations in precipitation frequency
J. Belnap, S. L. Phillips, M. E. Miller
2004, Oecologia (141) 306-316
Biological soil crusts, a community of cyanobacteria, lichens, and mosses that live on the soil surface, occur in deserts throughout the world. They are a critical component of desert ecosystems, as they are important contributors to soil fertility and stability. Future climate scenarios predict alteration of the timing and amount...
The effects of macroinvertebrate taxonomic resolution in large landscape bioassessments: An example from the Mid-Atlantic Highlands, U.S.A.
I.R. Waite, A.T. Herlihy, D. P. Larsen, N.S. Urquhart, D.J. Klemm
2004, Freshwater Biology (49) 474-489
1. During late spring 1993-1995, the U.S. Environmental Protection Agency's Environmental Monitoring and Assessment Program (EMAP) sampled 490 wadeable streams in the mid-Atlantic Highlands (MAH) of the U.S. for a variety of physical, chemical and biological indicators of environmental condition. We used the resulting data set to evaluate the importance...
Relations among habitat characteristics, exotic species, and turbid-river cyprinids in the Missouri River drainage of Wyoming
M.C. Quist, W.A. Hubert, F.J. Rahel
2004, Transactions of the American Fisheries Society (133) 727-742
We used data from 91 stream reaches in the Missouri River drainage of Wyoming to determine whether abiotic and biotic factors were related to the abundance of four cyprinid species associated with turbid-river environments: flathead chub Platygobio gracilis, sturgeon chub Macrhybopsis gelida, plains minnow Hybognathus placitus, and western silvery minnow...
Larval sucker drift in the Lower Williamson River, Oregon: Evaluation of two proposed water diversion sites for the Modoc Point Irrigation District
T.J. Tyler, C.M. Ellsworth, R.S. Shively, S. P. VanderKooi
2004, Report
n/a ...
Identification of amoebae implicated in the life cycle of Pfiesteria and Pfiesteria-like dinoflagellates
M.T. Peglar, T.A. Nerad, O.R. Anderson, P.M. Gillevet
2004, Journal of Eukaryotic Microbiology (51) 542-552
This study was undertaken to assess whether amoebae commonly found in mesohaline environments are in fact stages in the life cycles of Pfiesteria and Pfiesteria-like dinoflagellates. Primary isolations of amoebae and dinoflagellates were made from water and sediment samples from five tributaries of the Chesapeake Bay. Additional amoebae were also cloned from bioassay aquaria...
Sediment resuspension and transport patterns on a fringing reef flat, Molokai, Hawaii
A.S. Ogston, C. D. Storlazzi, M.E. Field, M.K. Presto
2004, Coral Reefs (23) 559-569
Corals are known to flourish in various turbid environments around the world. The quantitative distinction between clear and turbid water in coral habitats is not well defined nor are the amount of sediment in suspension and rates of sedimentation used to evaluate the condition of reef environments well established. This...
Accumulation of PCB congeners in nestling tree swallows (Tachycineta bicolor) on the Hudson River, New York
Kathy R. Echols, Donald E. Tillitt, John W. Nichols, Anne L. Secord, John P. McCarty
2004, Environmental Science & Technology (38) 6240-6246
Tree swallows (Tachycineta bicolor) were used as a sentinel species to monitor the contamination and bioavailability of polychlorinated biphenyls (PCBs) in the Hudson River watershed. Several tree swallow nest box colonies around and downstream from Hudson Falls, NY, were studied. Tree swallow eggs, adults, and 5-, 10-, and 15-day-old nestlings...
Inferring time‐varying recharge from inverse analysis of long‐term water levels
Jesse E. Dickinson, R. T. Hanson, T.P.A. Ferre, S. A. Leake
2004, Water Resources Research (40)
Water levels in aquifers typically vary in response to time‐varying rates of recharge, suggesting the possibility of inferring time‐varying recharge rates on the basis of long‐term water level records. Presumably, in the southwestern United States (Arizona, Nevada, New Mexico, southern California, and southern Utah), rates of mountain front recharge to...
Ichthyophoniasis: An emerging disease of Chinook salmon in the Yukon River
R. Kocan, P. Hershberger, J. Winton
2004, Journal of Aquatic Animal Health (16) 58-72
Before 1985, Ichthyophonus was unreported among Pacific salmon Oncorhynchus spp. from the Yukon River; now it infects more than 40% of returning adult Chinook salmon O. tshawytscha. Overall infection prevalence reached about 45% in the Yukon River and about 30% in the Tanana River between 1999 and 2003. Mean infection...
Environment, agriculture, and settlement patterns in a marginal Polynesian landscape
P.V. Kirch, A.S. Hartshorn, O.A. Chadwick, P.M. Vitousek, D. R. Sherrod, J. Coil, L. Holm, W.D. Sharp
2004, Proceedings of the National Academy of Sciences of the United States of America (101) 9936-9941
Beginning ca. A.D. 1400, Polynesian farmers established permanent settlements along the arid southern flank of Haleakala Volcano, Maui, Hawaiian Islands; peak population density (43-57 persons per km2) was achieved by A.D. 1700-1800, and it was followed by the devastating effects of European contact. This settlement, based on dryland agriculture with...
Landslides triggered by the 2002 Denali fault, Alaska, earthquake and the inferred nature of the strong shaking
R.W. Jibson, E. L. Harp, W. Schulz, D. K. Keefer
2004, Earthquake Spectra (20) 669-691
The 2002 M7.9 Denali fault, Alaska, earthquake triggered thousands of landslides, primarily rock falls and rock slides, that ranged in volume from rock falls of a few cubic meters to rock avalanches having volumes as great as 15 ?? 106 m3. The pattern of landsliding was unusual; the number of...
Linking intended visitation to regional economic impact models of bison and elk management
J. Loomis, L. Caughlan
2004, Human Dimensions of Wildlife (9) 17-33
This article links intended National Park visitation estimates to regional economic models to calculate the employment impacts of alternative bison and elk management strategies. The survey described alternative National Elk Refuge (NER) management actions and the effects on elk and bison populations at the NER and adjacent Grand Teton National...
Winter survival of lesser scaup in east-central Florida
G. Herring, J.A. Collazo
2004, Journal of Wildlife Management (68) 1082-1087
The North American continental population of lesser scaup (Aythya affinis) has been declining since the mid-1980s. Seasonal survival estimates may provide insights about the ecological basis for this decline, but such data are not available. We estimated post-harvest winter survival of lesser scaup in east-central Florida, USA, where 62% of...
VEMAP Phase 2 bioclimatic database. I. Gridded historical (20th century) climate for modeling ecosystem dynamics across the conterminous USA
T.G.F. Kittel, N.A. Rosenbloom, J. Andrew Royle, Christopher Daly, W.P. Gibson, H.H. Fisher, P. Thornton, D.N. Yates, S. Aulenbach, C. Kaufman, R. McKeown, D. Bachelet, D. S. Schimel, R. Neilson, J. Lenihan, R. Drapek, D.S. Ojima, W.J. Parton, J. M. Melillo, D. W. Kicklighter, H. Tian, A. D. McGuire, M.T. Sykes, B. Smith, S. Cowling, T. Hickler, I. C. Prentice, S. Running, K.A. Hibbard, W.M. Post, A.W. King, T. Smith, B. Rizzo, F.I. Woodward
2004, Climate Research (27) 151-170
Analysis and simulation of biospheric responses to historical forcing require surface climate data that capture those aspects of climate that control ecological processes, including key spatial gradients and modes of temporal variability. We developed a multivariate, gridded historical climate dataset for the conterminous USA as a common input database for...
Macroscopic and microscopic observations of particle-facilitated mercury transport from New Idria and Sulphur Bank mercury mine tailings
G.V. Lowry, S. Shaw, C.S. Kim, J. J. Rytuba, Gordon E. Brown Jr.
2004, Environmental Science & Technology (38) 5101-5111
Mercury (Hg) release from inoperative Hg mines in the California Coast Range has been documented, but little is known about the release and transport mechanisms. In this study, tailings from Hg mines located in different geologic settings-New Idria (NI), a Si-carbonate Hg deposit, and Sulphur Bank (SB), a hot-spring Hg...
Moisture content measurements of moss (Sphagnum spp.) using commercial sensors
K. Yoshikawa, P.P. Overduin, J.W. Harden
2004, Permafrost and Periglacial Processes (15) 309-318
Sphagnum (spp.) is widely distributed in permafrost regions around the arctic and subarctic. The moisture content of the moss layer affects the thermal insulative capacity and preservation of permafrost. It also controls the growth and collapse history of palsas and other peat mounds, and is relevant, in general terms, to...
Effects of nutritional history on nitrogen assimilation in congeneric temperate and tropical scleractinian corals
G.A. Piniak, F. Lipschultz
2004, Marine Biology (145) 1085-1096
The nutritional history of corals is known to affect metabolic processes such as inorganic nutrient uptake and photosynthesis, but little is known about how it affects assimilation efficiency of ingested prey items or the partitioning of prey nitrogen between the host and symbiont. The temperate scleractinian coral Oculina arbuscula and...
The springs of Lake Pátzcuaro: chemistry, salt-balance, and implications for the water balance of the lake
James L. Bischoff, Isabel Israde-Alcantara, Victor H. Garduno-Monroy, Wayne C. Shanks III
2004, Applied Geochemistry (19) 1827-1835
Lake Pa??tzcuaro, the center of the ancient Tarascan civilization located in the Mexican altiplano west of the city of Morelia, has neither river input nor outflow. The relatively constant lake-salinity over the past centuries indicates the lake is in chemical steady state. Springs of the south shore constitute the primary...
Distribution of sea anemones (Cnidaria, Actiniaria) in Korea analyzed by environmental clustering
H.-R. Cha, R. W. Buddemeier, D.G. Fautin, P. Sandhei
2004, Conference Paper, Hydrobiologia
Using environmental data and the geospatial clustering tools LOICZView and DISCO, we empirically tested the postulated existence and boundaries of four biogeographic regions in the southern part of the Korean peninsula. Environmental variables used included wind speed, sea surface temperature (SST), salinity, tidal amplitude, and the chlorophyll spectral signal. Our...
Stratal order in Pennsylvanian cyclothems: Discussion
C.P. Weibel, B.H. Wilkinson, G.K. Merrill, S.J. Kivett
2004, Geological Society of America Bulletin (116) 1545-1550
In summation, the attempt by Wilkinson et al. (2003) to statistically test for the presence of high-frequency, terrestrial to marine sequences in the cyclothem "type section" in western Illinois may have been hindered by the absence of the marine components of the cyclothems. Because of the lack of marine strata,...
Paleomagnetism of the Red Dog Zn-Pb massive sulfide deposit in northern Alaska
Michael T. Lewchuk, D. L. Leach, K.D. Kelley, David T. A. Symons
2004, Economic Geology (99) 1555-1567
Paleomagnetic methods have isolated two ancient magnetizations in and around the Paleozoic shale-hosted Red Dog ore deposit in northern Alaska. A high-latitude, westerly magnetization carried by magnetite, termed characteristic remanent magnetization A, was found in rocks that have barite and/or substantial quartz replacement of barite. An intermediate- to low-latitude, southerly...
