Integrating ecosystem studies: A Bayesian comparison of hypotheses
Milo D. Adkison, Brenda E. Ballachey, James L. Bodkin, Leslie E. Holland-Bartels
F. Funk, T.J. Quinn II, J. Heifetz, J.N. Ianelli, J.E. Powers, J.F. Schweigert, P.J. Sullivan, C.-I. Zhang, editor(s)
1998, Conference Paper, Proceedings of the international symposium on fishery stock assessment models for the 21st century; 15th Lowell Wakefield fisheries symposium
Ecosystem studies are difficult to interpret because of the complexity and number of pathways that may affect a phenomenon of interest. It is not possible to study all aspects of a problem; thus subjective judgment is required to weigh what has been observed in the context of components that were...
Genetic differentiation between wintering populations of lesser snow geese nesting on Wrangel Island, Russia
S.B. Kuznetsov, Vasily V. Baranyuk, John Y. Takekawa
1998, The Auk (115) 1053-1057
Arctic breeding populations of Lesser Snow Geese (Chen c. caerulescens) range from Baffin Island in eastern Canada to Wrangel Island, Russia, which is located 650 km west of Alaska (Bellrose 1980). Although hundreds of thousands of Lesser Snow Geese may have occupied the Russian arctic in the mid1800s (see Takekawa...
Satellite radar interferometry measures deformation at Okmok Volcano
Zhong Lu, Dorte Mann, Jeff Freymueller
1998, Eos, Transactions, American Geophysical Union (79) 461-468
The center of the Okmok caldera in Alaska subsided 140 cm as a result of its February– April 1997 eruption, according to satellite data from ERS-1 and ERS-2 synthetic aperture radar (SAR) interferometry. The inferred deflationary source was located 2.7 km beneath the approximate center of the caldera using a...
Backyard bolides: Finding a buried impact crater
C. Wylie Poag
1998, The Planetary Report (18) 6-8
Geologist Wylie Poag explains how he happened to find a major impact crater buried beneath Chesapeake Bay....
An inter-comparison test of an RD Instruments' workhorse ADCP mounted in a new trawl-resistant bottom mount, an RD instruments' broadband ADCP and Vector measuring current meter
M. Martini, P. Clay
1998, Conference Paper, Oceanology International 98: The global ocean: Conference proceedings (Volume 1)
No abstract available....
The Toms Canyon structure, New Jersey outer continental shelf: A possible late Eocene impact crater
C. W. Poag, L.J. Poppe
1998, Marine Geology (145) 23-60
The Toms Canyon structure [~20-22 km wide] is located on the New Jersey outer continental shelf beneath 80-100 m of water, and is buried by ~1 km of upper Eocene to Holocene sedimentary strata. The structure displays several characteristics typical of terrestrial impact craters (flat floor; upraised faulted rim: brecciated...
North American landscape characterization project: The production of a continental scale three-decade Landsat data set
Terry L. Sohl, John L. Dwyer
1998, Geocarto International (13) 43-51
The North American Landscape Characterization (NALC) project is a component of the National Aeronautics and Space Administration (NASA) Landsat Pathfinder program. Pathfinder projects are focused on the investigation of global change utilizing current remote sensing technologies. The NALC project is a cooperative effort between the U. S. Environmental Protection Agency...
Modeling tidal hydrodynamics of San Diego Bay, California
P.-F. Wang, R. T. Cheng, K. Richter, E.S. Gross, D. Sutton, J. W. Gartner
1998, Journal of the American Water Resources Association (34) 1123-1140
In 1983, current data were collected by the National Oceanic and Atmospheric Administration using mechanical current meters. During 1992 through 1996, acoustic Doppler current profilers as well as mechanical current meters and tide gauges were used. These measurements not only document tides and tidal currents in San Diego Bay, but...
Superfund GIS - Physiographic Provinces, Aquifer Outcrops and Recharge Rates in Tennessee
D.J. Greene, W.J. Wolfe
1998, Report
This dataset is a coverage of the physiographic provinces, aquifer outcrops and recharge rates for Tennessee. Each polygon is attributed with its associated physiographic region name (Miller, 1974), aquifer type and composition (Connell and Barron, 1993, p. 2), and aquifer recharge rates (Hoos, 1990 p. 19)...
Occurrence and distribution of semivolatile organic compounds in stream bed sediments, United States, 1992-95
Thomas J. Lopes, Edward T. Furlong, Jeffrey W. Pritt
Edward E. Little, Bruce M. Greenberg, Aaron J. DeLonay, editor(s)
1998, Book chapter, Environmental Toxicology and Risk Assessment: Seventh Volume
Bed-sediment samples from streams were collected from 443 sites in 19 major river basins during 1992-95 and analyzed for semivolatile organic compounds (SVOCs) to assess the occurrence and distribution of selected Hydrophobic contaminants. Forty SVOCs were detected in more than 5 percent of samples. Of these 40 SVOCs, 27 were...
Breeding synchrony and extrapair fertilizations in two populations of red-winged blackbirds
D. F. Westneat, Elizabeth M. Gray
1998, Behavioral Ecology (9) 456-464
We tested the relationship between synchrony of breeding and the frequency of extrapair fertilizations (EPFs) in two populations of red-winged blackbirds known to differ in female extrapair behavior. We found no association between the number of simultaneously fertilizable females (temporal neighbors) and EPF rate in either population, although a significant...
Effect of implanted satellite transmitters on the nesting behavior of Murres
P.M. Meyers, Scott A. Hatch, D.M. Mulcahy
1998, Condor (100) 172-174
We implanted 6 Common Murres (Uria aalge) and 10 Thick-billed Murres (Uria lomvia) with satellite transmitters and compared subsequent presence at the colony, nesting status, and provisioning to a control group that underwent a simple surgical procedure. In the 10 days following implantation, we resighted 10 of 11 control birds...
Numerical analysis of the hydrogeologic controls in a layered coastal aquifer system, Oahu, Hawaii, USA
D.S. Oki, W. R. Souza, E.L. Bolke, G.R. Bauer
1998, Hydrogeology Journal (6) 243-263
The coastal aquifer system of southern Oahu, Hawaii, USA, consists of highly permeable volcanic aquifers overlain by weathered volcanic rocks and interbedded marine and terrestrial sediments of both high and low permeability. The weathered volcanic rocks and sediments are collectively known as caprock, because they impede...
Geohydrologic unit boundaries along the Colorado Front Range
Sharon Rafferty
1998, Report
This digital geospatial data set consists of geohydrologic unit boundaries shown in the report "Structure, outcrop, and subcrop of the bedrock aquifers along the western margin of the Denver Basin, Colorado" (Robson and others, 1998)....
Uptake and loss kinetics of Cd, Cr and Zn in the bivalves Potamocorbula amurensis and Macoma balthica: Effects of size and salinity
B.-G. Lee, W.G. Wallace, S. N. Luoma
1998, Marine Ecology Progress Series (175) 177-189
...
Pair interactions in red-faced warblers
P.M. Barber, T. E. Martin, Kimberly G. Smith
1998, Condor (100) 512-518
Forty pairs of breeding Red-faced Warblers (Cardellina rubrifrons) were observed in 1992 and 1993 on the Mogollon Rim, Arizona. Intrusions by extra-pair males, interactions between pair members, and other pair interaction behaviors were recorded. The majority of intrusions occurred during the building stage of the nesting cycle. Males responded to...
Effect of temperature on the pharmacokinetics of benzocaine in rainbow trout (Oncorhynchus mykiss) after bath exposures
G. R. Stehly, J.R. Meinertz, W.H. Gingerich
1998, Journal of Veterinary Pharmacology and Therapeutics (21) 121-127
The pharmacokinetics of benzocaine during bath exposures at 1 mg/L were determined in rainbow trout acclimated at 6 °C, 12 °C or 18 °C for at least 1 month. Individual fish were exposed to benzocaine in a recirculating system for 4 h and pharmacokinetic parameters were estimated in a unique...
Sensitivity of condition indices to changing density in a white-tailed deer population
M.G. Sams, R.L. Lochmiller, C.W. Qualls Jr., David M. Leslie Jr.
1998, Journal of Wildlife Diseases (34) 110-125
The ways in which comprehensive condition profiles, incorporating morphometric, histologic, physiologic, and diet quality indices, responded to changes in density of a white-tailed deer (Odocoileus virginianus) population were examined. Changes in these condition indices were monitored in a northeastern Oklahoma deer herd as...
Well log evaluation of gas hydrate saturations
T. S. Collett
1998, Conference Paper, Transactions of the SPWLA Annual Logging Symposium (Society of Professional Well Log Analysts)
The amount of gas sequestered in gas hydrates is probably enormous, but estimates are highly speculative due to the lack of previous quantitative studies. Gas volumes that may be attributed to a gas hydrate accumulation within a given geologic setting are dependent on a number of reservoir parameters; one of...
Herpetology of the Sulphur Springs Valley, Cochise County, Arizona
P.C. Rosen, S.S. Sartorius, C.R. Schwalbe, P. A. Holm, C.H. Lowe
1998, Proceedings RMRS-P-3
No abstract available at this time...
Tidal creek changes at the Sonoma Baylands restoration site
John R. Dingler, David A. Cacchione
Magoon O.T.Converse H.Baird B.Miller-Henson M., editor(s)
1998, Conference Paper, Proceedings of the Conference on California and the World Ocean
Over the past 150 years, human activity has had a major impact on tidal wetlands adjoining the San Francisco Bay-Delta estuary Growing concern about the effect of this change on the ecology of the estuary has prompted Bay area managers to attempt to reclaim tidal wetlands. The Sonoma Baylands Restoration...
Winter foraging ecology of bald eagles on a regulated river in southwest Idaho
Gregory S. Kaltenecker, Karen Steenhof, Marc J. Bechard, James C. Munger
1998, Journal of Raptor Research (32) 215-220
We studied Bald Eagle foraging ecology on the South Fork Boise River,Idaho, during the winters of 1990-92. We compared habitat variables at 29 foraging sites, 94 perch sites, and 131 random sites.Habitat variables included river habitat (pool, riffle, run), distance to the nearest change in river habitat, distance to nearest available...
Reconstructing the spatial pattern of trees from routine stand examination measurements
M.L. Hanus, D.W. Hann, D.D. Marshall
1998, Forest Science (44) 125-133
Reconstruction of the spatial pattern of trees is important for the accurate visual display of unmapped stands. The proposed process for generating the spatial pattern is a nonsimple sequential inhibition process, with the inhibition zone proportionate to the scaled maximum crown width of an open-grown tree of the same species...
Ground-water discharge and base-flow nitrate loads of nontidal streams, and their relation to a hydrogeomorphic classification of the Chesapeake Bay watershed, middle Atlantic Coast
L. Joseph Bachman, Bruce D. Lindsey, John W. Brakebill, David S. Powars
1998, Water-Resources Investigations Report 98-4059
Existing data on base-flow and groundwater nitrate loads were compiled and analyzed to assess the significance of groundwater discharge as a source of the nitrate load to nontidal streams of the Chesapeake Bay watershed. These estimates were then related to hydrogeomorphic settings based on lithology and physiographic province to provide...
Bryophyte species associations with coarse woody debris and stand ages in Oregon
T. Rambo, Patricia S. Muir
1998, Bryologist (101) 366-376
We quantified the relationships of 93 forest floor bryophyte species, including epiphytes from incorporated litterfall, to substrate and stand age in Pseudotsuga menziesii-Tsuga heterophylla stands at two sites in western Oregon. We used the method of Dufrêne and Legendre that combines a species' relative abundance and relative frequency, to calculate...
