Upstream migration of Pacific lampreys in the John Day River, Oregon: Behavior, timing, and habitat use
T. Craig Robinson, J.M. Bayer
2005, Northwest Science (79) 106-119
Adult Pacific lamprey migration and habitat preferences for over-winter holding and spawning, and larval rearing in tributaries to the Columbia River are not well understood. The John Day River is one such tributary where larval and adult stages of this species have been documented, and its free-flowing character provided the...
Net alkalinity and net acidity 2: Practical considerations
C.S. Kirby, C.A. Cravotta III
2005, Applied Geochemistry (20) 1941-1964
The pH, alkalinity, and acidity of mine drainage and associated waters can be misinterpreted because of the chemical instability of samples and possible misunderstandings of standard analytical method results. Synthetic and field samples of mine drainage having various initial pH values and concentrations of dissolved metals and alkalinity were titrated...
Distribution, foraging behavior, and capture results of the spotted bat (Euderma maculatum) in central Oregon
T.J. Rodhouse, M.F. McCaffrey, R.G. Wright
2005, Western North American Naturalist (65) 215-222
The spotted bat (Euderma maculatum) has been virtually unknown in Oregon despite the existence of potential habitat in many areas of the state. In 2002 and 2003 we searched for spotted bats along the John Day, Deschutes, and Crooked Rivers and at a remote dry canyon southeast of the city...
Comparison of sediment grain size characteristics on nourished and un-nourished estuarine beaches and impacts on horseshoe crab habitat, Delaware Bay, New Jersey
N.L. Jackson, D. R. Smith, K.F. Nordstrom
2005, Zeitschrift fur Geomorphologie, Supplementband (141) 31-45
This study was undertaken to determine whether nourished and un-nourished estuarine beaches have conspicuous differences in sediment size and sorting that could affect their value as habitat for horseshoe crabs. Comparisons are made of beach profiles and sediment samples gathered at 0.15 m and 0.30 m depths on the backshore,...
Characterizing a large shear-zone with seismic and magnetotelluric methods: The case of the Dead Sea Transform
N. Maercklin, P. A. Bedrosian, C. Haberland, O. Ritter, T. Ryberg, M. Weber, U. Weckmann
2005, Geophysical Research Letters (32)
Seismic tomography, imaging of seismic scatterers, and magnetotelluric soundings reveal a sharp lithologic contrast along a ???10 km long segment of the Arava Fault (AF), a prominent fault of the southern Dead Sea Transform (DST) in the Middle East. Low seismic velocities and resistivities occur on its western side and...
New evidence for persistent or transient seed banks in three Sonoran Desert cacti
Janice E. Bowers
2005, Southwestern Naturalist (50) 482-487
Seedlings of Ferocactus wislizeni and Mammillaria grahamii, 2 common cactus species in the northern Sonoran Desert, emerged under protective cages that had been left in place for 6 years after an initial sowing of numerous Carnegiea gigantea and F. wislizeni seeds. Because no seeds were sown in the interim, Mammillaria...
Transport and fate of nitrate and pesticides: Hydrogeology and riparian zone processes
L.J. Puckett, W.B. Hughes
2005, Journal of Environmental Quality (34) 2278-2292
There is continuing concern over potential impacts of widespread application of nutrients and pesticides on ground- and surface-water quality. Transport and fate of nitrate and pesticides were investigated in a shallow aquifer and adjacent stream, Cow Castle Creek, in Orangeburg County, South Carolina. Pesticide and pesticide degradate concentrations were detected...
A universal surface complexation framework for modeling proton binding onto bacterial surfaces in geologic settings
D. Borrok, B.F. Turner, J.B. Fein
2005, American Journal of Science (305) 826-853
Adsorption onto bacterial cell walls can significantly affect the speciation and mobility of aqueous metal cations in many geologic settings. However, a unified thermodynamic framework for describing bacterial adsorption reactions does not exist. This problem originates from the numerous approaches that have been chosen for modeling bacterial surface protonation reactions....
Temporal variations and scaling of streamflow and baseflow and their nitrate-nitrogen concentrations and loads
Y.-K. Zhang, K. Schilling
2005, Advances in Water Resources (28) 701-710
The patterns of temporal variations of precipitation (P), streamflow (SF) and baseflow (BF) as well as their nitrate-nitrogen (nitrate) concentrations (C) and loads (L) from a long-term record (28 years) in the Raccoon River, Iowa, were analyzed using variogram and spectral analyses. The daily P is random but scaling may...
Influence of water chemistry and travel distance on bacteriophage PRD-1 transport in a sandy aquifer
W.J. Blanford, M.L. Brusseau, T.-C. Jim Yeh, C.P. Gerba, R. Harvey
2005, Water Research (39) 2345-2357
Experiments were conducted to evaluate the impact of groundwater chemistry and travel distance on the transport and fate behavior of PRD-1, a bacteriophage employed as a surrogate tracer for pathogenic enteric viruses. The experiments were conducted in the unconfined aquifer at the United States...
Growth hormone and insulin-like growth factors in fish: Where we are and where to go
M. Reinecke, Bjorn Thrandur Bjornsson, Walton W. Dickhoff, S. D. McCormick, I. Navarro, D.M. Power, J. Gutierrez
2005, Conference Paper, General and Comparative Endocrinology
This communication summarizes viewpoints, discussion, perspectives, and questions, put forward at a workshop on "Growth hormone and insulin-like growth factors in fish" held on September 7th, 2004, at the 5th International Symposium on Fish Endocrinology in Castello??n, Spain. ?? 2005 Elsevier Inc. All rights reserved....
Predictability of littoral-zone fish communities through ontogeny in Lake Texoma, Oklahoma-Texas, USA
M.A. Eggleton, R. Ramirez, C.W. Hargrave, K.B. Gido, J.R. Masoner, G.D. Schnell, W.J. Matthews
2005, Environmental Biology of Fishes (73) 21-36
We sampled larval, juvenile and adult fishes from littoral-zone areas of a large reservoir (Lake Texoma, Oklahoma-Texas) (1) to characterize environmental factors that influenced fish community structure, (2) to examine how consistent fish-environment relationships were through ontogeny (i.e., larval vs. juvenile and adult), and (3) to measure the concordance of...
Density-dependent habitat selection by brown-headed cowbirds (Molothrus ater) in tallgrass prairie
W.E. Jensen, J.F. Cully Jr.
2005, Oecologia (142) 136-149
Local distributions of avian brood parasites among their host habitats may depend upon conspecific parasite density. We used isodar analysis to test for density-dependent habitat selection in brown-headed cowbirds (Molothrus ater) among tallgrass prairie adjacent to wooded edges, and prairie interior habitat (>100 m from wooded edges) with and without...
Modeling duckweed growth in wastewater treatment systems
L. Landesman, N. C. Parker, C.B. Fedler, M. Konikoff
2005, Livestock Research for Rural Development (17)
Species of the genera Lemnaceae, or duckweeds, are floating aquatic plants that show great promise for both wastewater treatment and livestock feed production. Research conducted in the Southern High Plains of Texas has shown that Lemna obscura grew well in cattle feedlot runoff water and produced leaf tissue with a...
Variation in the reference Shields stress for bed load transport in gravel‐bed streams and rivers
Erich R. Mueller, John Pitlick, Jonathan M. Nelson
2005, Water Resources Research (41)
The present study examines variations in the reference shear stress for bed load transport (τr) using coupled measurements of flow and bed load transport in 45 gravel‐bed streams and rivers. The study streams encompass a wide range in bank‐full discharge (1–2600 m3/s), average channel gradient (0.0003–0.05), and median surface grain...
Five things I've learned in 25 years of popularizing geology
R. Buchanan
2005, Palaios (20) 1-2
[No abstract available]...
234Th, 210Pb, 210Po and stable Pb in the central equatorial Pacific: Tracers for particle cycling
J.W. Murray, B. Paul, J.P. Dunne, T. Chapin
2005, Deep-Sea Research Part I: Oceanographic Research Papers (52) 2109-2139
Samples were collected during the 1992 US JGOFS EqPac Survey I and II cruises from 12??N to 12??S at 140??W in the central equatorial Pacific for water column profiles of dissolved, particulate and total 234Th, 210Pb and 210Po and total acid soluble stable Pb and sediment trap fluxes of 234Th,...
Evidence and implications of recent climate change in Northern Alaska and other Arctic regions
L. D. Hinzman, N.D. Bettez, W.R. Bolton, F.S. Chapin, M.B. Dyurgerov, C.L. Fastie, B. Griffith, R.D. Hollister, Allen Hope, H.P. Huntington, A.M. Jensen, G.J. Jia, T. Jorgenson, D.L. Kane, D.R. Klein, G. Kofinas, A.H. Lynch, A.H. Lloyd, A. D. McGuire, Frederick E. Nelson, W.C. Oechel, T.E. Osterkamp, C.H. Racine, V.E. Romanovsky, R. S. Stone, D.A. Stow, M. Sturm, C.E. Tweedie, G.L. Vourlitis, M.D. Walker, D.A. Walker, P.J. Webber, J.M. Welker, K.S. Winker, K. Yoshikawa
2005, Climatic Change (72) 251-298
The Arctic climate is changing. Permafrost is warming, hydrological processes are changing and biological and social systems are also evolving in response to these changing conditions. Knowing how the structure and function of arctic terrestrial ecosystems are responding to recent and persistent climate change is paramount to understanding the future...
Disparate effects of constant and annually-cycling daylength and water temperature on reproductive maturation of striped bass (Morone saxatilis)
R.W. Clark, A. Henderson-Arzapalo, C.V. Sullivan
2005, Aquaculture (249) 497-513
Adult striped bass (Morone saxatilis) were exposed to various combinations of constant or anually-cycling daylength and water temperature. Constant conditions (15 h days, 18 °C) were those normally experienced at spawning and cycling conditions simulated natural changes at Chesapeake Bay latitude. Females exposed...
Mismatch between herbivore behavior and demographics contributes to scale-dependence of host susceptibility in two pine species
T. Ylioja, D. H. Slone, M.P. Ayres
2005, Forest Science (51) 522-531
The impacts on forests of tree-killing bark beetles can depend on the species composition of potential host trees. Host susceptibility might be an intrinsic property of tree species, or it might depend on spatial patterning of alternative host species. We compared the susceptibility of loblolly pine (Pinus taeda) and Virginia...
Environmental contaminants and biomarker responses in fish from the Rio Grande and its U.S. tributaries: Spatial and temporal trends
C. J. Schmitt, J.E. Hinck, V. S. Blazer, N. D. Denslow, G.M. Dethloff, T.M. Bartish, J.J. Coyle, D. E. Tillitt
2005, Science of the Total Environment (350) 161-193
We collected, examined, and analyzed 368 fish of seven species from 10 sites on rivers of the Rio Grande Basin (RGB) during late 1997 and early 1998 to document temporal and geographic trends in the concentrations of accumulative contaminants and to assess contaminant effects on the fish. Sites were located...
The Zamama-Thor region of Io: Insights from a synthesis of mapping, topography, and Galileo spacecraft data
David A. Williams, Laszlo P. Keszthelyi, Paul M. Schenk, Moses P. Milazzo, Rosaly Lopes, Julie A. Rathbun, Ronald Greeley
2005, Icarus (177) 69-88
We have studied data from the Galileo spacecraft's three remote sensing instruments (Solid-State Imager (SSI), Near-Infrared Mapping Spectrometer (NIMS), and Photopolarimeter-Radiometer (PPR)) covering the Zamama–Thor region of Io's antijovian hemisphere, and produced a geomorphological map of this region. This is the third of three regional maps we are producing from the Galileo spacecraft data. Our goal is to...
Evidence of detrimental effects of environmental contaminants on growth and reproductive physiology of white sturgeon in impounded areas of the Columbia River
G.W. Feist, M.A.H. Webb, D.T. Gundersen, E.P. Foster, C.B. Schreck, A.G. Maule, M.S. Fitzpatrick
2005, Environmental Health Perspectives (113) 1675-1682
This study sought to determine whether wild white sturgeon from the Columbia River (Oregon) were exhibiting signs of reproductive endocrine disruption. Fish were sampled in the free-flowing portion of the river (where the population is experiencing reproductive success) and from three reservoirs behind hydroelectric dams (where fish have reduced reproductive...
Impact of food supplementation and methionine on high densities of cotton rats: Support of the amino-acid-quality hypothesis?
R.E. Webb, David M. Leslie Jr., R.L. Lochmiller, R.E. Masters
2005, Journal of Mammalogy (86) 46-55
Considerable research supports the tenet that quantity and quality of food limit vertebrate populations. We evaluated predictions that increased availabilities of food and the essential amino acid methionine were related to population limitation of the hispid cotton rat (Sigmodon hispidus). Effects of supplemental food and methionine on density, survival, and...
Fire history of the San Francisco East Bay region and implications for landscape patterns
Jon E. Keeley
2005, International Journal of Wildland Fire (14) 285-296
The San Francisco East Bay landscape is a rich mosaic of grasslands, shrublands and woodlands that is experiencing losses of grassland due to colonization by shrubs and succession towards woodland associations. The instability of these grasslands is apparently due to their disturbance-dependent nature coupled with 20th century changes in fire...
