Trends and variability in snowmelt runoff in the western United States
G.J. McCabe, M.P. Clark
2005, Journal of Hydrometeorology (6) 476-482
The timing of snowmelt runoff (SMR) for 84 rivers in the western United States is examined to understand the character of SMR variability and the climate processes that may be driving changes in SMR timing. Results indicate that the timing of SMR for many rivers in the western United States...
Albino mutation rates in red mangroves (Rhizophora mangle L.) as a bioassay of contamination history in Tampa Bay, Florida, USA
C.E. Proffitt, S.E. Travis
2005, Wetlands (25) 326-334
We assessed the sensitivity of a viviparous estuarine tree species, Rhizophora mangle, to historic sublethal mutagenic stress across a fine spatial scale by comparing the frequency of trees producing albino propagules in historically contaminated (n=4) and uncontaminated (n=11) forests in Tampa Bay, Florida, USA. Data from uncontaminated forests were used...
Repeating coupled earthquakes at Shishaldin Volcano, Alaska
J. Caplan-Auerbach, T. Petersen
2005, Journal of Volcanology and Geothermal Research (145) 151-172
Since it last erupted in 1999, Shishaldin Volcano, Aleutian Islands, Alaska, has produced hundreds to thousands of long-period (1-2 Hz; LP) earthquakes every day with no other sign of volcanic unrest. In 2002, the earthquakes also exhibited a short-period (4-7 Hz; SP) signal occurring between 3 and 15 s before...
A note on the comparative turbidity of some estuaries of the Americas
R.J. Uncles, R. E. Smith
2005, Journal of Coastal Research (21) 845-852
Field data from 27 estuaries of the Americas are used to show that, in broad terms, there is a large difference in turbidity between the analyzed east and west-coast estuaries and that tidal range and tidal length have an important influence on that turbidity. Generic, numerical sediment-transport modeling is used...
Population genetic structure and conservation of marbled murrelets (Brachyramphus marmoratus)
Vicki L. Friesen, T.P. Birt, John F. Piatt, R.T. Golightly, S. H. Newman, P.N. Hebert, B.C. Congdon, G. Gissing
2005, Conservation Genetics (6) 607-614
Marbled murrelets (Brachyramphus marmoratus) are coastal seabirds that nest from California to the Aleutian Islands. They are declining and considered threatened in several regions. We compared variation in the mitochondrial control region, four nuclear introns and three microsatellite loci among 194 murrelets from throughout their range except Washington and Oregon....
Dating Plio-Pleistocene glacial sediments using the cosmic-ray-produced radionuclides 10Be and 26Al
G. Balco, J. O. H. Stone, C. Jennings
2005, American Journal of Science (305) 1-41
We use the cosmic-ray-produced radionuclides 26Al and 10Be to date Plio-Pleistocene glacial sediment sequences. These two nuclides are produced in quartz at a fixed ratio, but have different decay constants. If a sample is exposed at the surface for a time and then buried by overburden and thus removed from the cosmic-ray...
Soil biota can change after exotic plant invasion: Does this affect ecosystem processes?
Jayne Belnap, Susan L. Phillips, S. K. Sherrod, A. Moldenke
2005, Ecology (86) 3007-3017
Invasion of the exotic annual grass Bromus tectorum into stands of the native perennial grass Hilaria jamesii significantly reduced the abundance of soil biota, especially microarthropods and nematodes. Effects of invasion on active and total bacterial and fungal biomass were variable, although populations generally increased after 50+ years of invasion....
Modeling of site occupancy dynamics for northern spotted owls, with emphasis on the effects of barred owls
Gail S. Olson, Robert G. Anthony, Eric D. Forsman, Steven H. Ackers, Peter J. Loschl, Janice A. Reid, Katie M. Dugger, Elizabeth M. Glenn, William J. Ripple
2005, Journal of Wildlife Management (69) 918-932
Northern spotted owls (Strix occidentalis caurina) have been studied intensively since their listing as a threatened species by the U.S. Fish and Wildlife Service in 1990. Studies of spotted owl site occupancy have used various binary response measures, but most of these studies have made the assumption that detectability is...
The relationship between habitat characteristics and demographic performance of northern spotted owls in southern Oregon
Katie M. Dugger, Frank Wagner, Robert G. Anthony, Gail S. Olson
2005, The Condor (107) 863-878
We used data from Northern Spotted Owl (Strix occidentalis caurina) territories to model the effects of habitat (particularly intermediate-aged forest stand types), climate, and nonhabitat covariates (i.e., age, sex) on owl reproductive rate and apparent survival in southwestern Oregon. Our best model for reproductive rate included an interaction between a...
Timing of seed dispersal generates a bimodal seed bank depth distribution
J. L. Espinar, K. Thompson, L. V. Garcia
2005, American Journal of Botany (92) 1759-1763
The density of soil seed banks is normally highest at the soil surface and declines monotonically with depth. Sometimes, for a variety of reasons, peak density occurs below the surface but, except in severely disturbed soils, it is generally true that deeper seeds are older. In seasonally dry habitats that...
Evaluation of ecological risk to populations of a threatened plant from an invasive biocontrol insect
S. M. Louda, T. A. Rand, A. E. Arnett, A. S. McClay, A. K. McEachern
2005, Ecological Applications (15) 234-249
Controversy exists over estimation of ecological risk in biological control. At present, the risk to the rare, federally listed Pitcher's thistle (Cirsium pitcheri) in North America from Rhinocyllus conicus, a biological control weevil now feeding on many native thistles, is unknown. We hypothesized that quantification of host specificity and potential...
Sonoran Desert winter annuals affected by density of red brome and soil nitrogen
L. F. Salo, G. R. McPherson, D. G. Williams
2005, American Midland Naturalist (153) 95-109
Red brome [Bromus madritensis subsp. rubens (L.) Husn.] is a Mediterranean winter annual grass that has invaded Southwestern USA deserts. This study evaluated interactions among 13 Sonoran Desert annual species at four densities of red brome from 0 to the equivalent of 1200 plants m−2. We examined these interactions at low...
Breeding bird assemblages associated with stages of forest succession in large river floodplains
Melinda G. Knutson, Laura E. McColl, Susan A. Suarez
2005, Natural Areas Journal (25) 55-70
Floodplain forests rival all other habitat types in bird density and diversity. However, major successional changes are predicted for floodplain forests along the Mississippi River in the coming decades; young forests may replace the existing mature silver maple (Acer saccharinum L.) forests in some areas. We wanted to assess how...
Use of isotopes, age-dating, and numerical simulation to evaluate source histories and transport of NO3- to public supply wells in principal aquifers of the United States
P.B. McMahon, J.K. Bohlke, C. Brown, K. Burow, C. A. Crandall, Matthew K. Landon
2005, Conference Paper, Proceedings of the 6th International Symposium on Applied Isotope Geochemistry
No abstract available. ...
Modeling tritium transport through a deep unsaturated zone in an arid environment
C.J. Mayers, Brian J. Andraski, C.A. Cooper, S.W. Wheatcraft, David A. Stonestrom, R. L. Michel
2005, Vadose Zone Journal (4) 967-976
Understanding transport of tritium (3H) in unsaturated zones is critical to evaluating options for waste isolation. Tritium typically is a large component of low-level radioactive waste (LLRW). Studies at the U.S. Geological Survey's Amargosa Desert Research Site (ADRS) in Nevada investigate 3H transport from a closed LLRW facility. Two boreholes...
Assessment of White Salmon watershed using the ecosystem diagnosis and treatment methodology (EDT)
M.B. Allen, P.J. Connolly
2005, Report
No abstract available ...
Seabird, fish, marine mammal, and oceanography coordinated investigations (SMMOCI) in Sitka Sound, Alaska, July 2000
John F. Piatt, Donald E. Dragoo
2005, U.S. Fish and Wildlife Service Report AMNWR 04/01
Surveys for seabirds and marine mammals were conducted in and near Sitka Sound, Alaska (Fig. 1) from the M/V Tiĝlax̂ during 12-16 July 2000 (Table 1, Fig. 1). The objective was to characterize the marine environment in the vicinity of St. Lazaria Island, one of ten seabird colonies monitored annually...
Drought monitoring techniques for famine early warning systems in Africa
James D. Rowland, J. P. Verdin, A. Adoum, G.B. Senay
V.K. Boken, A.P. Cracknell, R.L. Heathcote, editor(s)
2005, Book chapter, Monitoring and predicting agricultural drought— A global study
No abstract available....
Near-shore and off-shore habitat use by endangered, juvenile Lost River and shortnose suckers, and near-shore water quality, in Upper Klamath Lake, Oregon. Annual Report 2005
H.A. Hendrixson, S. P. VanderKooi, A.X Wilkens, S. M. Burdick
2005, Report
No abstract available ...
A method adapting microarray technology for signature tagged mutagenesis of Dusulfovibrio dusulfuricans G20 and Shewanella oneidensis MR-1 in anaerobic sediment survival experiments
Jennifer L. Groh, Qingwei Luo, Jimmy D. Ballard, Lee R. Krumholz
2005, Applied and Environmental Microbiology (71) 7064-7074
Signature-tagged mutagenesis (STM) is a powerful technique that can be used to identify genes expressed by bacteria during exposure to conditions in their natural environments. To date, there have been no reports of studies in which this approach was used to study organisms of environmental, rather than pathogenic, significance. We...
Emperor Goose Anser canagicus
Joel A. Schmutz
Janet Kear, editor(s)
2005, Book chapter, Ducks, geese, and swans
No abstract available....
Why is metal bioaccumulation so variable? Biodynamics as a unifying concept
Samuel N. Luoma, Philip S. Rainbow
2005, Environmental Science & Technology (39) 1921-1931
Ecological risks from metal contaminants are difficult to document because responses differ among species, threats differ among metals, and environmental influences are complex. Unifying concepts are needed to better tie together such complexities. Here we suggest that a biologically based conceptualization, the biodynamic model, provides the necessary unification for a...
Software Review: A program for testing capture-recapture data for closure
Thomas R. Stanley, Jon D. Richards
2005, Wildlife Society Bulletin (33) 782-785
Capture-recapture methods are widely used to estimate population parameters of free-ranging animals. Closed-population capture-recapture models, which assume there are no additions to or losses from the population over the period of study (i.e., the closure assumption), are preferred for population estimation over the open-population models, which do not assume closure,...
Selenium in the Blackfoot, Salt, and Bear River Watersheds
S. J. Hamilton, K.J. Buhl
2005, Environmental Monitoring and Assessment (104) 309-339
Nine stream sites in the Blackfoot River, Salt River, and Bear River watersheds in southeast Idaho, USA were sampled in May 2001 for water, surficial sediment, aquatic plants, aquatic invertebrates, and fish. Selenium was measured in these aquatic ecosystem components, and a hazard assessment was performed on the data. Water...
Linking the scales of observation, process, and modeling of dust emissions
K.E. Kohfeld, R. L. Reynolds, J.D. Pelletier, B. Nickling
2005, Conference Paper, Eos
[No abstract available]...
