Landscape scale measures of steelhead (Oncorhynchus mykiss) bioenergetic growth rate potential in Lake Michigan and comparison with angler catch rates
T.O. Hook, E.S. Rutherford, Shannon J. Brines, C. A. Geddes, D.M. Mason, D.J. Schwab, G.W. Fleischer
2004, Journal of Great Lakes Research (30) 545-556
The relative quality of a habitat can influence fish consumption, growth, mortality, and production. In order to quantify habitat quality, several authors have combined bioenergetic and foraging models to generate spatially explicit estimates of fish growth rate potential (GRP). However, the capacity of GRP to reflect the spatial distributions of...
Paleomagnetism and 40Ar/39Ar ages from volcanics extruded during the Matuyama and Brunhes Chrons near McMurdo Sound, Antarctica
L. Tauxe, Philip B. Gans, Edward A. Mankinen
2004, Geochemistry, Geophysics, Geosystems (5) 1-20
Maps of virtual geomagnetic poles derived from international geomagnetic reference field models show large lobes with significant departures from the spin axis. These lobes persist in field models for the last few millenia. The anomalous lobes are associated with observation sites at extreme southerly latitudes. To determine whether these features...
The effects of wavelet compression on Digital Elevation Models (DEMs)
M. J. Oimoen
2004, Conference Paper, 2004 IEEE International Geoscience and Remote Sensing Symposium proceedings
This paper investigates the effects of lossy compression on floating-point digital elevation models using the discrete wavelet transform. The compression of elevation data poses a different set of problems and concerns than does the compression of images. Most notably, the usefulness of DEMs depends largely in the quality of their...
Mono Lake excursion recorded in sediment of the Santa Clara Valley, California
Edward A. Mankinen, Carl M. Wentworth
2004, Geochemistry, Geophysics, Geosystems (5) 1-14
Two intervals recording anomalous paleomagnetic inclinations were encountered in the top 40 meters of research drill hole CCOC in the Santa Clara Valley, California. The younger of these two intervals has an age of 28,090 ± 330 radiocarbon years B.P. (calibrated age ∼32.8 ka). This age is in excellent agreement...
Effects of Ichthyophonus on survival and reproductive success of Yukon River Chinook salmon. Final report for study 01-200
R. Kocan, P. Hershberger, J. Winton
2004, Report
No abstract available ...
Geophysical data reveal the crustal structure of the Alaska Range orogen within the aftershock zone of the Mw 7.9 Denali fault earthquake
M. A. Fisher, N. A. Ratchkovski, W. J. Nokleberg, L. Pellerin, J.M.G. Glen
2004, Bulletin of the Seismological Society of America (94) S107-S131
Geophysical information, including deep-crustal seismic reflection, magnetotelluric (MT), gravity, and magnetic data, cross the aftershock zone of the 3 November 2002 Mw 7.9 Denali fault earthquake. These data and aftershock seismicity, jointly interpreted, reveal the crustal structure of the right-lateral-slip Denali fault and the eastern Alaska Range orogen, as well...
Canada lynx Lynx canadensis habitat and forest succession in northern Maine, USA
C.L. Hoving, D.J. Harrison, W.B. Krohn, W.J. Jakubas, M.A. McCollough
2004, Wildlife Biology (10) 285-294
The contiguous United States population of Canada lynx Lynx canadensis was listed as threatened in 2000. The long-term viability of lynx populations at the southern edge of their geographic range has been hypothesized to be dependent on old growth forests; however, lynx are a specialist predator on snowshoe hare Lepus...
Evaluation of ultrastructure and random effects band recovery models for estimating relationships between survival and harvest rates in exploited populations
David L. Otis, Gary C. White
2004, Animal Biodiversity and Conservation (27) 157-173
Increased population survival rate after an episode of seasonal exploitation is considered a type of compensatory population response. Lack of an increase is interpreted as evidence that exploitation results in added annual mortality in the population. Despite its importance to management of exploited species, there are limited statistical techniques for...
Comparisons of ground motions from five aftershocks of the 1999 Chi-Chi, Taiwan, earthquake with empirical predictions largely based on data from California
G.-Q. Wang, D.M. Boore, H. Igel, X.-Y. Zhou
2004, Bulletin of the Seismological Society of America (94) 2198-2212
The observed ground motions from five large aftershocks of the 1999 Chi-Chi, Taiwan, earthquake are compared with predictions from four equations based primarily on data from California. The four equations for active tectonic regions are those developed by Abrahamson and Silva (1997), Boore et al. (1997), Campbell (1997, 2001), and...
Study on geophone coupling and attenuating compensatory of low-depression velocity layer in desert area
Z. Shi, G. Tian, S. Dong, J. Xia, H. He
Chen C.Xia J., editor(s)
2004, Conference Paper, Progress in Environmental and Engineering Geophysics: Proceedings of the International Conference on Environmental and Engineering Geophysics, ICEEG 2004
In a desert area, it is difficult to couple geophones with dry sands. A low and depression velocity layer can seriously attenuate high frequency components of seismic data. Therefore, resolution and signal-to-noise (S/N) ratio of seismic data deteriorate. To enhance resolution and S/N ratio of seismic data, we designed a...
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...
Illinois drainage water management demonstration project
D.J. Pitts, R. Cooke, P. J. Terrio
Cooke R.A., editor(s)
2004, Conference Paper, Proceedings of the 8th International Drainage Symposium - Drainage VIII
Due to naturally high water tables and flat topography, there are approximately 4 million ha (10 million ac) of farmland artificially drained with subsurface (tile) systems in Illinois. Subsurface drainage is practiced to insure trafficable field conditions for farm equipment and to reduce crop stress from excess water within the...
The Susitna Glacier thrust fault: Characteristics of surface ruptures on the fault that initiated the 2002 Denali fault earthquake
A. J. Crone, S. F. Personius, P. A. Craw, Peter J. Haeussler, L. A. Staft
2004, Bulletin of the Seismological Society of America (94) S5-S22
The 3 November 2002 Mw 7.9 Denali fault earthquake sequence initiated on the newly discovered Susitna Glacier thrust fault and caused 48 km of surface rupture. Rupture of the Susitna Glacier fault generated scarps on ice of the Susitna and West Fork glaciers and on tundra and surficial deposits along the southern...
Identification of larval Pacific lampreys (Lampetra tridentata), river lampreys (L. ayresi), and western brook lampreys (L. richardsoni) and thermal requirements of early life history stages of lampreys
M.H. Meeuwig, J.M. Bayer, J.G. Seelye, R.A. Reiche
2004, Report
No abstract available ...
U.S. land cover and land use change—1973-2000
D.E. Napton, Thomas R. Loveland
B. Warf, D. Janelle, K. Hansen, editor(s)
2004, Book chapter, WorldMinds—geographical perspectives on 100 problems
No abstract available....
An economic analysis of alternative fertility control and associated management techniques for three BLM wild horse herds
John M. Bartholow
2004, Open-File Report 2004-1199
Contemporary cost projections were computed for several alternative strategies that could be used by BLM to manage three wild horse populations. The alternatives included existing gather and selective removal methods, combined with potential contraceptive applications of varying duration and other potentially useful management techniques. Costs were projected for a 20-year...
Cabeza Prieta National Wildlife Refuge: A survey of visitor experiences: Report to respondents
Phadrea D. Ponds, Nina Burkardt, Lynne Koontz
2004, Open-File Report 2004-1331
In the fall of 2000, researchers from the Policy Analysis and Science Assistance Program (PASA) of the Fort Collins Science Center (FORT) in the U.S. Geological Survey (USGS) met with the staff of the Cabeza Prieta National Wildlife Refuge (CPNWR) to discuss the issues related to social, economic, and human...
Reach-scale isotope tracer experiment to quantify denitrification and related processes in a nitrate-rich stream, midcontinent United States
J.K. Böhlke, J. W. Harvey, M.A. Voytek
2004, Limnology and Oceanography (49) 821-838
We conducted an in-stream tracer experiment with Br and 15N-enriched NO3- to determine the rates of denitrification and related processes in a gaining NO3- -rich stream in an agricultural watershed in the upper Mississippi basin in September 2001. We determined reach-averaged rates of N fluxes and reactions from isotopic analyses...
Phylogenetic evidence for an ancient rapid radiation of Caribbean sponge-dwelling snapping shrimps (Synalpheus)
C.L. Morrison, R. Rios, J.E. Duffy
2004, Molecular Phylogenetics and Evolution (30) 563-581
A common challenge in reconstructing phylogenies involves a high frequency of short internal branches, which makes basal relationships difficult to resolve. Often it is not clear whether this pattern results from insufficient or inappropriate data, versus from a rapid evolutionary radiation. The snapping shrimp genus Synalpheus, which contains in excess...
Patterns of nitrogen accumulation and cycling in riparian floodplain ecosystems along the Green and Yampa rivers
Adair Carol E., Dan Binkley, Douglas C. Andersen
2004, Oecologia (139) 108-116
Patterns of nitrogen (N) accumulation and turnover in riparian systems in semi-arid regions are poorly understood, particularly in those ecosystems that lack substantial inputs from nitrogen fixing vegetation. We investigated sources and fluxes of N in chronosequences of riparian forests along the regulated Green River and the free-flowing Yampa River...
Three-dimensional distribution of gas hydrate beneath southern Hydrate Ridge: Constraints from ODP Leg 204
A.M. Trehu, P.E. Long, M.E. Torres, G. Bohrmann, F.R. Rack, T. S. Collett, D.S. Goldberg, A.V. Milkov, M. Riedel, P. Schultheiss, N.L. Bangs, S. R. Barr, W.S. Borowski, George E. Claypool, M.E. Delwiche, G.R. Dickens, E. Gracia, G. Guerin, M. Holland, J.E. Johnson, Y.-J. Lee, C.-S. Liu, X. Su, B. Teichert, H. Tomaru, M. Vanneste, M. E. Watanabe, J.L. Weinberger
2004, Earth and Planetary Science Letters (222) 845-862
Large uncertainties about the energy resource potential and role in global climate change of gas hydrates result from uncertainty about how much hydrate is contained in marine sediments. During Leg 204 of the Ocean Drilling Program (ODP) to the accretionary complex of the Cascadia subduction zone, we sampled the gas...
Historical channel-bed elevation change as a result of multiple disturbances, Soldier Creek, Kansas
K. E. Juracek
2004, Physical Geography (25) 269-290
Historical information on stream stage/discharge relations from eight U.S. Geological Survey (USGS) streamflow-gaging stations was used to analyze channel-bed elevation change along Soldier Creek, a stream affected by multiple disturbances in northeast Kansas. The analysis provided information on the spatial (location, type, magnitude) and temporal (timing, duration, trend, rate) dimensions...
Lessons from the 2003 wildfires in southern California
Jon E. Keeley, C. J. Fotheringham, M. A. Moritz
2004, Journal of Forestry (102) 26-31
The Southern California fires of late Oct. 2003 burned 742,000 ac and destroyed 3,361 homes and 26 lives. Factors leading up to this event were very different between forests, which comprised about 5% of the area burned, and shrublands. Three lessons are (1) although these fires were massive, they were...
U.S. federal requirements for search interoperability
E. Christian
2004, D-Lib Magazine (10)
[No abstract available]...
Acidification of forest soil in Russia: From 1893 to present
A.G. Lapenis, G.B. Lawrence, A.A. Andreev, A.A. Bobrov, M.S. Torn, J.W. Harden
2004, Global Biogeochemical Cycles (18)
It is commonly believed that fine-textured soils developed on carbonate parent material are well buffered from possible acidification. There are no data, however, that document resistance of such soils to acidic deposition exposure on a timescale longer than 30-40 years. In this paper, we report on directly testing the long-term...
