Responses of stable bay-margin and barrier-island systems to Holocene sea-level highstands, western Gulf of Mexico
Robert A. Morton, Jeffrey G. Paine, Michael D. Blum
2000, Journal of Sedimentary Research (70) 478-490
The microtidal, wave-dominated coast of the western Gulf of Mexico displays a variety of Holocene geomorphic features indicating higher-than-present water levels that were previously attributed to storm processes while geoidal sea level was at its present position. Field and aerial-photograph examinations of bay margins, barrier islands, and beach-ridge plains following...
Palynomorphs of Permian Gondwana coal from borehole GDH-38, Barapukuria Coal Basin, Bangladesh
A. Akhtar, R.M. Kosanke
2000, Journal of African Earth Sciences (31) 107-117
Thirty-two core samples of Permian Gondwana coal from three coal beds of borehole GDH-38, Barapukuria Coal Basin, Dinajpur, the north-northwestern part of Bangladesh, have been collected for palynological analysis. All samples except one yielded palynomorphs and some samples contain well-preserved and abundant palynomorphs of the gymnospermal and cryptogamic groups that...
Effects of water conditions on clutch size, egg volume, and hatchling mass of mallards and gadwalls in the Prairie Pothole Region
Pamela J. Pietz, Gary L. Krapu, Deborah A. Buhl, David A. Brandt
2000, Condor (102) 936-940
We examined the relationship between local water conditions (measured as the percent of total area of basins that was covered by water) and clutch size, egg volume, and hatchling mass of Mallards (Anas platyrhynchos) and Gadwalls (A. strepera) on four study sites in the Prairie Pothole Region of North Dakota...
Pyroclast/snow interactions and thermally driven slurry formation. Part 1: Theory for monodisperse grain beds
J. S. Walder
2000, Bulletin of Volcanology (62) 105-118
Lahars are often produced as pyroclastic flows move over snow. This phenomenon involves a complicated interplay of mechanical and thermal processes that need to be separated to get at the fundamental physics. The thermal physics of pyroclast/snow interactions form the focus of this paper. A theoretical model is developed of...
Dilational processes accompanying earthquakes in the Long Valley Caldera
Douglas S. Dreger, Hrvoje Tkalcic, M. Johnston
2000, Science (288) 122-125
Regional distance seismic moment tensor determinations and broadband waveforms of moment magnitude 4.6 to 4.9 earthquakes from a November 1997 Long Valley Caldera swarm, during an inflation episode, display evidence of anomalous seismic radiation characterized by non-double couple (NDC) moment tensors with significant volumetric components. Observed coseismic dilation suggests that...
Atmospheric transport, deposition, and fate of triazine herbicides and their metabolites in pristine areas at Isle Royale National Park
E.M. Thurman, A.E. Cromwell
2000, Environmental Science & Technology (34) 3079-3085
Trace concentrations of triazine herbicides, used in the Midwestern United States, are being transported atmospherically hundreds of kilometers and deposited by precipitation onto pristine areas, such as Isle Royale National Park (Lake Superior). Atrazine, deethylatrazine, deisopropylatrazine, and cyanazine were detected in Isle Royale rainfall from mid-May to...
Mars south polar spring and summer behavior observed by TES: seasonal cap evolution controlled by frost grain size
Hugh H. Kieffer, Timothy N. Titus, Kevin F. Mullins, Phillip R. Christensen
2000, Journal of Geophysical Research E: Planets (105) 9653-9699
Thermal Emission Spectrometer (TES) observations of the recession phase of Mars' south polar cap are used to quantitatively map this recession in both thermal and visual appearance. Geographically nonuniform behavior interior to the cap is characterized by defining several small regions which exemplify the range of behavior. For most of...
Predictable interregional movements by female northern pintails during winter
R. R. Cox Jr., A. D. Afton
2000, Waterbirds (23) 258-269
Factors influencing initiation of regional and interregional movements by nonbreeding ducks are poorly understood, especially during winter. During winters 1990-1991 through 1992-1993, we radiotagged 347 female Northern Pintails (Anas acuta) in southwestern Louisiana and monitored their movements to three regions: (1) the Gulf Coast Region of Louisiana and Texas (outside...
Anthropogenic platinum and palladium in the sediments of Boston Harbor
C.B. Tuit, G.E. Ravizza, Michael H. Bothner
2000, Environmental Science & Technology (34) 927-932
Anthropogenic activity has increased recent sediment concentrations of Pt and Pd in Boston Harbor by approximately 5 times background concentrations. Surface sediments and downcore profiles were investigated to evaluate Pt and Pd accumulation and behavior in urban coastal sediments. There is no clear correlation between temporal changes in Pt and...
The North American Reporting Center for Amphibian Malformations
Douglas H. Johnson, S.C. Fowle, J.A. Jundt
2000, Journal of the Iowa Academy of Science (107) 123-127
No abstract available....
Homing and movement of yellow-phase American eels in freshwater ponds
P. J. Lamothe, M. Gallagher, D.P. Chivers, J.R. Moring
2000, Environmental Biology of Fishes (58) 393-399
Ten yellow-phase American eels, Anguilla rostrata, were captured from Hammond Pond, a small freshwater pond located in central Maine, U.S.A. The eels were implanted with radio transmitters and released into nearby Hermon Pond. At the same time, 10 eels were captured from Hermon Pond, implanted with radio transmitters and returned...
Leadership in wolf, Canis lupus, packs
L. David Mech
2000, Canadian Field-Naturalist (114) 259-263
I examine leadership in Wolf (Canis lupus) packs based on published observations and data gathered during summers from 1986 to 1998 studying a free-ranging pack of Wolves on Ellesmere Island that were habituated to my presence. The breeding male tended to initiate activities associated with foraging and travel, and the...
Comparison of an enzyme-linked immunosorbent assay (ELISA) to gas chromatography (GC) - measurement of polychlorinated biphenyls (PCBs) in selected US fish extracts
J.L. Zajicek, D. E. Tillitt, T.R. Schwartz, C. J. Schmitt, R.O. Harrison
2000, Chemosphere (40) 539-548
The analysis of PCBs in fish tissues by immunoassay methods was evaluated using fish collected from a US monitoring program, the National Contaminant Biomonitoring Program of the US Department of Interior, Fish and Wildlife Service. Selected composite whole fish samples, which represented widely varying concentrations and sources of PCBs, were...
Risk factors associated with capture-related death in eastern wild turkey hens
D.S. Nicholson, R.L. Lochmiller, M.D. Stewart, R.E. Masters, David M. Leslie Jr.
2000, Journal of Wildlife Diseases (36) 308-315
Capture-related mortality has been a notable risk in the handling of eastern wild turkey (Meleagris gallopavo silvestris). Our objective was to evaluate how environmental factors influence risk and identify physiological correlates that could be used to identify susceptible birds. During winter (January–March) 1995–97, 130 eastern wild turkey hens were captured...
An organized signal in snowmelt runoff over the western United States
D. H. Peterson, R. E. Smith, M. D. Dettinger, D.R. Cayan, L. Riddle
2000, Journal of the American Water Resources Association (36) 421-432
Daily-to-weekly discharge during the snowmelt season is highly correlated among river basins in the upper elevations of the central and southern Sierra Nevada (Carson, Walker, Tuolumne, Merced, San Joaquin, Kings, and Kern Rivers). In many cases, the upper Sierra Nevada watershed operates in a single mode (with varying catchment amplitudes)....
Identification of a small, naked virus in tumor-like aggregates in cell lines derived from a green turtle, Chelonia mydas, with fibropapillomas
Y. Lu, A.A. Aguirre, Thierry M. Work, G.H. Balazs, V.R. Nerurkar, R. Yanagihara
2000, Journal of Virological Methods (86) 25-33
Serial cultivation of cell lines derived from lung, testis, periorbital and tumor tissues of a green turtle (Chelonia mydas) with fibropapillomas resulted in the in vitro formation of tumor-like cell aggregates, ranging in size from 0.5 to 2.0 mm in diameter. Successful induction of tumor-like aggregates was achieved in a...
Temporal flexibility of reproduction in temperate-breeding dabbling ducks
Gary L. Krapu
2000, The Auk (117) 640-650
I compared nesting intervals during three consecutive years in five species of temperate-nesting dabbling ducks (Mallard [Anas platyrhynchos], Northern Pintail [Anas acuta], Northern Shoveler [Anas clypeata], Blue-winged Teal [Anas discors], Gadwall [Anas strepera]) and assessed whether differences existed in timing of refractoriness. Most nesting by females of all five species...
Mallard brood survival in prairie pothole landscapes
Gary L. Krapu, P.J. Pietz, D.A. Brandt, R. R. Cox Jr.
2000, Waterfowl (13) 18-18
No abstract available....
Map data in support of forest management
E. A. Fosnight, D. Greenlee
2000, Journal of Forestry (98) 50-52
Now widely available and inexpensive, prepackaged map data are easy to use--and just as easy to use incorrectly. To select the proper scale and appropriate thematic attributes so that the data actually inform the project at hand, managers need to know the basics....
Rapid distribution of earthquake information for everybody
A. Jones, A. Michael, B. Simpson, S. Jacob, D. Oppenheimer
2000, Seismological Research Letters (71) 355-358
No matter who you are, seismologist or regular person on the street, when you feel the Earth move you want to know what's going on. Was it an earthquake? Where was the earthquake? How big was it? As a grad student, many moons ago, when the Earth moved, the Electronic...
Restoring ecological integrity of great rivers: Historical hydrographs aid in defining reference conditions for the Missouri River
D.L. Galat, R. Lipkin
2000, Conference Paper, Hydrobiologia
Restoring the ecological integrity of regulated large rivers necessitates characterizing the natural flow regime. We applied 'Indicators of Hydrologic Alteration' to assess the natural range of variation of the Missouri River's flow regime at 11 locations before (1929-1948) and after (1967-1996) mainstem impoundment. The 3768 km long Missouri River was...
Turbidite megabeds in an Oceanic Rift Valley recording jokulhlaups of late Pleistocene glacial lakes of the western United States
G.G. Zuffa, W. R. Normark, F. Serra, C.A. Brunner
2000, Journal of Geology (108) 253-274
Escanaba Trough is the southernmost segment of the Gorda Ridge and is filled by sandy turbidites locally exceeding 500 m in thickness. New results from Ocean Drilling Program (ODP) Sites 1037 and 1038 that include accelerator mass spectrometry (AMS) 14C dates and revised petrographic evaluation of the sediment provenance, combined...
Contribution of increasing CO2 and climate to carbon storage by ecosystems in the United States
D. Schimel, J. Melillo, H. Tian, A. D. McGuire, D. Kicklighter, T. Kittel, N. Rosenbloom, S. Running, P. Thornton, D. Ojima, W. Parton, R. Kelly, M. Sykes, R. Neilson, B. Rizzo
2000, Science (287) 2004-2006
The effects of increasing carbon dioxide (CO2) and climate on net carbon storage in terrestrial ecosystems of the conterminous United States for the period 1895-1993 were modeled with new, detailed historical climate information. For the period 1980-1993, results from an ensemble of three models agree within 25%, simulating a land...
Biogeochemical effects of global change on U.S. National Parks
R. Herrmann, R. Stottlemyer, J.C. Zak, R.L. Edmonds, H. Van Miegroet
2000, Journal of the American Water Resources Association (36) 337-346
Federal parks and other public lands have unique mandates and rules regulating their use and conservation. Because of variation in their response to local, regional, and global-scale disturbance, development of mitigation strategies requires substantial research in the context of long-term inventory and monitoring. In 1982, the National Park Service began...
The Beaver River structure: A cross-strike discontinuity of possible crustal dimensions in the southern Mackenzie Fold Belt, Yukon and Northwest territories, Canada
D.W. Morrow, W.C. Miles
2000, Bulletin of Canadian Petroleum Geology (48) 19-29
A significant cross-strike structural discontinuity, the Beaver River Structure, has been recognized near the boundary between the north-central part of the Mackenzie Fold Belt and its southern part, the Liard Plateau. The Beaver River Structure is the northeast continuation of the Beaver Fault toward the confluence of the South Nahanni...
