The impact of introduced round gobies (Neogobius melanostomus) on phosphorus cycling in central Lake Erie
D.B. Bunnell, T.B. Johnson, C.T. Knight
2005, Canadian Journal of Fisheries and Aquatic Sciences (62) 15-29
We used an individual-based bioenergetic model to simulate the phosphorus flux of the round goby (Neogobius melanostomus) population in central Lake Erie during 1995-2002. Estimates of round goby diet composition, growth rates, and population abundance were derived from field sampling. As an abundant introduced fish, we predicted that round gobies...
Site characterization in densely fractured dolomite: Comparison of methods
M. Muldoon, K. R. Bradbury
2005, Ground Water (43) 863-876
One of the challenges in characterizing fractured-rock aquifers is determining whether the equivalent porous medium approximation is valid at the problem scale. Detailed hydrogeologic characterization completed at a small study site in a densely fractured dolomite has yielded an extensive data set that was used to evaluate the utility of...
Reconstructing a mid-Cretaceous landscape from paleosols in western Canada
David F. Ufnar, Luis A. Gonzalez, Greg A. Ludvigson, Richard L. Brenner, B.J. Witzke, D. Leckie
2005, Journal of Sedimentary Research (75) 984-996
The Albian Stage of the mid-Cretaceous was a time of equable climate conditions with high sea levels and broad shallow epeiric seas that may have had a moderating affect on continental climates. A Late Albian landscape surface that developed during a regression and subsequent sea-level rise in the Western Canada...
Interior channels in Martian valleys: Constraints on fluvial erosion by measurements of the Mars Express High Resolution Stereo Camera
R. Jaumann, D. Reiss, S. Frei, G. Neukum, F. Scholten, K. Gwinner, T. Roatsch, K.-D. Matz, V. Mertens, E. Hauber, H. Hoffmann, U. Kohler, J.W. Head, H. Hiesinger, M. H. Carr
2005, Geophysical Research Letters (32) 1-4
In High Resolution Stereo Camera (HRSC) images of the Mars Express Mission a 130 km long interior channel is identified within a 400 km long valley network system located in the Lybia Montes. Ages of the valley floor and the surroundings as derived from crater counts define a period of...
Algal productivity and nitrate assimilation in an effluent dominated concrete lined stream
Robert Kent, Kenneth Belitz, Carmen A. Burton
2005, Journal of the American Water Resources Association (41) 1109-1128
This study examined algal productivity and nitrate assimilation in a 2.85 km reach of Cucamonga Creek, California, a concrete lined channel receiving treated municipal wastewater. Stream nitrate concentrations observed at two stations indicated nearly continuous loss throughout the diel study. Nitrate loss in the reach was approximately 11 mg/L/d or...
Digital elevation model of King Edward VII Peninsula, West Antarctica, from SAR interferometry and ICESat laser altimetry
S. Baek, Oh-Ig Kwoun, Andreas Braun, Z. Lu, C. K. Shum
2005, IEEE Geoscience and Remote Sensing Letters (2) 413-417
We present a digital elevation model (DEM) of King Edward VII Peninsula, Sulzberger Bay, West Antarctica, developed using 12 European Remote Sensing (ERS) synthetic aperture radar (SAR) scenes and 24 Ice, Cloud, and land Elevation Satellite (ICESat) laser altimetry profiles. We employ differential interferograms from the ERS tandem mission SAR...
Foraging ecology of Caspian Terns in the Columbia River Estuary, USA
Donald E. Lyons, Daniel D. Roby, Ken Collis
2005, Waterbirds (28) 280-291
Comparisons were made of the foraging ecology of Caspian Terns (Sterna caspia) nesting on two islands in the Columbia River estuary using radio telemetry and observations of prey fed to chicks and mates at each colony. Early in the chick-rearing period, radio-tagged terns nesting...
Drainage networks after wildfire
D.A. Kinner, J. A. Moody
2005, International Journal of Sediment Research (20) 194-201
Predicting runoff and erosion from watersheds burned by wildfires requires an understanding of the three-dimensional structure of both hillslope and channel drainage networks. We investigate the small-and large-scale structures of drainage networks using field studies and computer analysis of 30-m digital elevation model. Topologic variables were derived from a composite...
Combined use of 15N and 18O of nitrate and 11B to evaluate nitrate contamination in groundwater
R. L. Seiler
2005, Applied Geochemistry (20) 1626-1636
Isotopic composition of NO3 (??15NNO3 and ??18ONO3) and B (??11B) were used to evaluate NO3 contamination and identify geochemical processes occurring in a hydrologically complex Basin and Range valley in northern Nevada with multiple potential sources of NO3. Combined use of these isotopes may be a useful tool in identifying...
Regulation of sand transport in the Colorado River by changes in the surface grain size of eddy sandbars over multi-year timescales
D.J. Topping, D. M. Rubin, J. C. Schmidt
2005, Sedimentology (52) 1133-1153
In settings where the transport of sand is partially or fully supply limited, changes in the upstream supply of sand are coupled to changes in the grain size of sand on the bed. In this manner, the transport of sand under the supply-limited case is 'grain-size regulated'. Since the closure...
Skeletal morphology of the forefoot in shrews (Mammalia: Soricidae) of the genus Cryptotis, as revealed by digital x-rays
N. Woodman, J.J.P. Morgan
2005, Journal of Morphology (266) 60-73
Variation in the forefoot skeleton of small-eared shrews (family Soricidae, genus Cryptotis) has been previously documented, but the paucity of available skeletons for most taxa makes assessment of the degrees of intraspecific and interspecific variation difficult. We used a digital X-ray system to extract images of the forefoot skeleton from...
Sub-seafloor acoustic characterization of seamounts near the Ogasawara Fracture Zone in the western Pacific using chirp (3-7 kHz) subbottom profiles
T.-G. Lee, J.R. Hein, Kenneth Lee, J.-W. Moon, Y.-T. Ko
2005, Deep-Sea Research Part I: Oceanographic Research Papers (52) 1932-1956
A detailed analysis of chirp (3-7 kHz) subbottom profiles and bathymetry was performed on data collected from seamounts near the Ogasawara Fracture Zone (OFZ) in the western Pacific. The OFZ, which is a 150 km wide rift zone showing 600 km of right-lateral movement in a NW-SE direction, is unique...
Percolation and transport in a sandy soil under a natural hydraulic gradient
Christopher T. Green, David A. Stonestrom, Barbara A. Bekins, Katherine C. Akstin, Marjorie S. Schulz
2005, Water Resources Research (41)
Unsaturated flow and transport under a natural hydraulic gradient in a Mediterranean climate were investigated with a field tracer experiment combined with laboratory analyses and numerical modeling. Bromide was applied to the surface of a sandy soil during the dry season. During the subsequent rainy season, repeated sediment sampling tracked...
Biotic interactions as determinants of ecosystem structure in prairie wetlands: An example using fish
M.A. Hanson, K.D. Zimmer, Malcolm G. Butler, B.A. Tangen, B.R. Herwig, N.H. Euliss Jr.
2005, Wetlands (25) 764-775
Wetlands are abundant throughout the prairie pothole region (PPR), an area comprising over 700,000 km2 in central North America. Prairie wetland communities are strongly influenced by regional physiography and climate, resulting in extreme spatial and temporal variability relative to other aquatic ecosystems. Given the strong influence of abiotic factors, PPR...
Foraging and nesting habitat of breeding male northern goshawks in the laurentian mixed forest province, Minnesota
C. W. Boal, D. E. Andersen, P.L. Kennedy
2005, Journal of Wildlife Management (69) 1516-1527
We used radiotelemetry to examine foraging habitat preferences of 17 breeding, male northern goshawks (Accipiter gentilis) in Minnesota from 1998-2000. We assessed habitat preference using radio relocation points and 50-m radius buffers of radio relocation points. Our data suggested that foraging male goshawks used early-successional upland conifer stands (???25 yrs...
Influence of thinning of Douglas-fir forests on population parameters and diet of northern flying squirrels
D.M. Gomez, R.G. Anthony, J. P. Hayes
2005, Journal of Wildlife Management (69) 1670-1682
We investigated the effects of thinning young (35- to 45-yr-old) Douglas-fir (Pseudotsuga menziesii) forests on density, survival, body mass, movements, and diets of northern flying squirrels (Glaucomys sabrinus) in the northern coast range of Oregon. We used a repeated measures, randomized block design with 3 treatments (control, moderate thinning, and...
Geospatial decision support systems for societal decision making
R. L. Bernknopf
2005, Boletin Geologico y Minero (116) 325-330
While science provides reliable information to describe and understand the earth and its natural processes, it can contribute more. There are many important societal issues in which scientific information can play a critical role. Science can add greatly to policy and management decisions to minimize loss of life and property...
Stress distribution along the Fairweather-Queen Charlotte transform fault system
C. G. Bufe
2005, Bulletin of the Seismological Society of America (95) 2001-2008
Tectonic loading and Coulomb stress transfer are modeled along the right-lateral Fairweather-Queen Charlotte transform fault system using a threedimensional boundary element program. The loading model includes slip below 12 km along the transform as well as motion of the Pacific plate, and it is consistent with most available Global Positioning...
Yellowstone bison fetal development and phenology of parturition
P.J.P. Gogan, K.M. Podruzny, E.M. Olexa, H.I. Pac, K.L. Frey
2005, Journal of Wildlife Management (69) 1716-1730
Knowledge of Yellowstone bison (Bison bison) parturition patterns allows managers to refine risk assessments and manage to reduce the potential for transmission of brucellosis between bison and cattle. We used historical (1941) and contemporary (1989–2002) weights and morphometric measurements of Yellowstone bison fetuses to describe fetal growth and to predict...
Long-term growth and succession in restored and natural mangrove forests in southwestern Florida
C.E. Proffitt, D.J. Devlin
2005, Wetlands Ecology and Management (13) 531-551
We compared colonization, growth and succession from 1989 to 2000 in a restored mangrove site and in gap and closed canopy sites in a natural mangrove forest. The restored site was created in 1982 and planted with Rhizophora mangle (???2 m-2) propagules. By 1989, Laguncularia racemosa, with densities up to...
Impact of land use and land cover change on groundwater recharge and quality in the southwestern US
Bridget R. Scanlon, Robert C. Reedy, David A. Stonestrom, David E. Prudic, Kevin F. Dennehy
2005, Global Change Biology (11) 1577-1593
Humans have exerted large‐scale changes on the terrestrial biosphere, primarily through agriculture; however, the impacts of such changes on the hydrologic cycle are poorly understood. The purpose of this study was to test the hypothesis that the conversion of natural rangeland ecosystems to agricultural ecosystems impacts the subsurface portion of...
Breeding ecology of Caspian terns at colonies on the Columbia Plateau
Michelle Antolos, D.D. Roby, K. Collis
2005, Northwest Science (78) 303-312
We investigated the breeding ecology and diet of Caspian terns on the Columbia Plateau in southeastern Washington and northeastern Oregon. We examined trends in colony size and area during 1996-2001, and estimated number of breeding pairs, nesting density, fledging success, and diet composition at selected colony sites in 2000 and...
Using fish biomarkers to monitor improvements in environmental quality
D.E. Facey, V. S. Blazer, M.M. Gasper, C.L. Turcotte
2005, Journal of Aquatic Animal Health (17) 263-266
The percentage of splenic tissue occupied by macrophage aggregates and hepatosomatic index (HSI) were evaluated in rock bass Ambloplites rupestris from Burlington Harbor, Vermont. In 1992, fish collected from the inner Burlington Harbor area had a significantly greater percentage of splenic tissue occupied by macrophage aggregates and greater HSI than...
U-Pb zircon geochronology of Mesoproterozoic postorogenic rocks and implications for post-Ottawan magmatism and metallogenesis, New Jersey Highlands and contiguous areas, USA
R.A. Volkert, R. E. Zartman, P.B. Moore
2005, Precambrian Research (139) 1-19
Postorogenic rocks are widespread in Grenville terranes of the north-central Appalachians where they form small, discordant, largely pegmatitic felsic intrusive bodies, veins, and dikes, and also metasomatic calcic skarns that are unfoliated and postdate the regional 1090 to 1030 Ma upper amphibolite- to granulite-facies metamorphism related to the Grenville (Ottawan)...
Channelization and floodplain forests: Impacts of accelerated sedimentation and valley plug formation on floodplain forests of the Middle Fork Forked Deer River, Tennessee, USA
S.N. Oswalt, S.L. King
2005, Forest Ecology and Management (215) 69-83
We evaluated the severe degradation of floodplain habitats resulting from channelization and concomitant excessive coarse sedimentation on the Middle Fork Forked Deer River in west Tennessee from 2000 to 2003. Land use practices have resulted in excessive sediment in the tributaries and river system eventually resulting in sand deposition on...
