2,3,7,8-TCDD effects on visual structure and function in swim-up rainbow trout
Paulo S. M. Carvalho
2004, Environmental Science & Technology (38) 6300-6306
An understanding of mechanisms of contaminant effects across levels of biological organization is essential in ecotoxicology if we are to generate predictive models for population-level effects. We applied a suite of biochemical, histological, and behavioral end points related to visual structure and function and foraging behavior to evaluate effects of...
Ecosystem restoration on the California Channel Islands
W. L. Halvorson
2004, Conference Paper, International Journal of Ecology and Environmental Sciences
Restoration of natural habitat has become increasingly important over the last three decades in the United States, first as mitigation for development (especially in wetlands), and more recently in natural areas. This latter restoration has come about as land managing agencies have seen the need to reverse the impact of...
A South San Francisco Bay sediment budget: Wetland restoration and potential effects on phytoplankton blooms
G.G. Shellenbarger, D. H. Schoellhamer, M. A. Lionberger
2004, Conference Paper, Proceedings of the 2004 Ocean Research Conference
No abstract available....
Hydrologic processes in deep vadose zones in interdrainage arid environments
Michelle Ann Walvoord, Bridget R. Scanlon
James F. Hogan, Fred M. Phillips, Bridget R. Scanlon, editor(s)
2004, Book chapter, Groundwater recharge in a desert environment: The southwestern United States (Water Science and Application, no. 9)
A unifying theory for the hydrology of desert vadose zones is particularly timely considering the rising population and water stresses in arid and semiarid regions. Conventional models cannot reconcile the apparent discrepancy between upward flow indicated by hydraulic gradient data and downward flow suggested by environmental tracer data in deep...
Cervid forage utilization in noncommercially thinned ponderosa pine forests
M.C. Gibbs, J.A. Jenks, C.S. Deperno, B.F. Sowell, Kurt J. Jenkins
2004, Journal of Range Management (57) 435-441
To evaluate effects of noncommercial thinning, utilization of forages consumed by elk (Cervus elaphus L.), mule deer (Odocoileus hemionus Raf.), and white-tailed deer (Odocoileus virginianus Raf.) was measured in ponderosa pine (Pinus ponderosa P. & C. Lawson) stands in Custer State Park, S. D. Treatments consisted of unthinned (control; 22...
Monitoring radionuclide contamination in the unsaturated zone - Lessons learned at the Amargosa Desert Research Site, Nye County, Nevada
David A. Stonestrom, Jared D. Abraham, Brian J. Andraski, Ronald J. Baker, C. Justin Mayers, Robert L. Michel, David E. Prudic, Robert G. Striegl, Michelle Ann Walvoord
2004, Conference Paper, Proceedings, Workshop on long-term performance monitoring of metals and radionuclides in the subsurface
Contaminant-transport processes are being investigated at the U.S. Geological Survey’s Amargosa Desert Research Site (A DRS), adjacent to the Nation’s first commercial disposal facility for low-level radioactive waste. Gases containing tritium and radiocarbon are migrating through a 110-m thick unsaturated zone from unlined trenches that received waste from 1962 to...
Populations dynamics of red brome (Bromus madritensis subsp. Rubens): Times for concern, opportunities for management
L. F. Salo
2004, Journal of Arid Environments (57) 291-296
Red brome is a Mediterranean winter annual grass that has invaded south-western USA deserts. Unlike native annuals, it does not maintain a soil seed bank, but exhibits early and uniform germination. Above-average winter precipitation in these regions allows red brome to reach high density and biomass. These are time for...
Seasonal movement and home range of the Mariana Common Moorhen
Leilani L. Takano, Susan M. Haig
2004, The Condor (106) 652-663
Adult Mariana Common Moorhens (Gallinula chloropus guami) were radio-marked on Guam (n = 25) and Saipan (n = 18) to determine home range, inter- and intraseasonal space use, and movement patterns among the Mariana Islands of Guam, Saipan, Tinian, and Rota. Birds were tracked throughout the dry and wet seasons...
Flower and fruit production of understory shrubs in western Washington and Oregon
B. Wender, C. Harrington, J. C. Tappeiner II
2004, Northwest Science (78) 124-140
We observed flower and fruit production for nine understory shrub species in western Washington and Oregon and examined the relationships between shrub reproductive output and plant size, plant age, site factors, and overstory density to determine the factors that control flowering or fruiting in understory shrubs. In Washington, 50 or...
Use of radar remote sensing (RADARSAT) to map winter wetland habitat for shorebirds in an agricultural landscape
Oriane W. Taft, Susan M. Haig, Chris Kiilsgaard
2004, Environmental Management (33) 750-763
Many of todays agricultural landscapes once held vast amounts of wetland habitat for waterbirds and other wildlife. Successful restoration of these landscapes relies on access to accurate maps of the wetlands that remain. We used C-band (5.6-cm-wavelength), HH-polarized radar remote sensing (RADARSAT) at a 38° incidence angle (8-m resolution) to...
Distribution and abundance of the Mariana subspecies of the Common Moorhen
Leilani L. Takano, Susan M. Haig
2004, Waterbirds (27) 245-250
Island-wide surveys for the endangered Mariana subspecies of the Common Moorhen (Gallinula chloropus guami) were conducted on Guam and the Commonwealth of the Northern Mariana Islands from May through September 2001. Based on these counts, the total adult moorhen population is estimated to be 287, with 154, 41, 2, and...
Habitat selection by tundra swans on Northern Alaska breeding grounds
Susan L. Earnst, T. Rothe
2004, Waterbirds (27) 224-233
Habitat selection by the Tundra Swan (Cygnus columbianus columbianus) was evaluated on the Colville River Delta prior to oil field development (1982-1989). Tundra Swan territories comprised a lake, used for refuge and foraging, and terrestrial habitats and ponds near the lake's perimeter used for foraging and nesting. Tundra swan sightings...
Winter distribution and abundance of Snowy Plovers in eastern North America and the West Indies
Elise Elliott-Smith, Susan M. Haig, C. L. Ferland, Leah Gorman
2004, Wader Study Group Bulletin (104) 28-33
Serum protein changes were studied in immune and nonimmune pigeons infected with three different strains of Trichomonas gallinae. Strain I (nonvirulent) produced no change in the relative concentration of serum components. Strains II (oral canker) and III (Jones' Barn) produced decreases in albumin and alpha globulins, and increases...
Genetic identification of spotted owls, barred owls, and their hybrids: Legal implications of hybrid identity
Susan M. Haig, Liv Wennerberg, Thomas D. Mullins, E.D. Forsman, P. Trail
2004, Conservation Biology (18) 1347-1357
Recent population expansion of Barred Owls ( Strix varia) into western North America has led to concern that they may compete with and further harm the Northern Spotted Owl ( S. occidentalis caurina), which is already listed as threatened under the U.S. Endangered Species Act (ESA). Because they hybridize, there...
Cannibalism and predation by western toad (Bufo boreas boreas) larvae in Oregon, USA
D.J. Jordan, C.J. Rombough, Christopher A. Pearl, B. McCreary
2004, Western North American Naturalist (64) 403-405
Larval amphibians have been widely used as model organisms in studies of community ecology of freshwater systems (Morin 1983, Alford 1999). Much of this work has assumed that trophic effects of larval anurans are focused on periphyton and planktonic algae (Dickman 1968, Seale 1980, Duellman and Trueb 1986), a view...
Wildfire, fuels reduction, and herpetofaunas across diverse landscape mosaics in northwestern forests
R. Bruce Bury
2004, Conservation Biology (18) 968-975
The herpetofauna (amphibians and reptiles) of northwestern forests (U.S.A.) is diverse, and many species are locally abundant. Most forest amphibians west of the Cascade Mountain crest are associated with cool, cascading streams or coarse woody material on the forest floor, which are characteristics of mature forests. Extensive loss and fragmentation...
Community- and landscape-level responses of reptiles and small mammals to feral-horse grazing in the Great Basin
Erik A. Beever, P. F. Brussard
2004, Journal of Arid Environments (59) 271-297
We investigated species- and community-level responses of squamate reptiles and granivorous small mammals to feral-horse grazing in two elevational strata across nine mountain ranges of the western Great Basin, USA. Although mammal species richness did not differ between horse-occupied and horse-removed sites, occupied sites possessed less community completeness (biotic integrity)...
Invasion of the Bullfrogs!
R. Bruce Bury
2004, The Klamath Kaleidoscope 1-1
No abstract available....
Effects of environmental change on groundwater recharge in the Desert Southwest
Fred M. Phillips, Michelle Ann Walvoord, Eric E. Small
James F. Hogan, Fred M. Phillips, Bridget R. Scanlon, editor(s)
2004, Water Science and Application 9
Climate and other environmental conditions have varied in the past, and will almost certainly vary significantly in the near future. The response of groundwater recharge to changes in environmental conditions is thus a matter of active concem for water-resources management. The major mechanisms for this response of recharge are three-fold....
Thermal characteristics of wild and captive Micronesian Kingfisher nesting habitats
Dylan C. Kesler, Susan M. Haig
2004, Zoo Biology (23) 301-308
To provide information for managing the captive population of endangered Guam Micronesian kingfishers (Halcyon cinnamomina cinnamomina), four biologically relevant thermal metrics were compared among captive facilities on the United States mainland and habitats used by wild Micronesian kingfishers on the island of Pohnpei (H. c. reichenbachii), Federated States of Micronesia....
Extraction of paleohydrology and paleoclimate proxies from vadose zones and paleolake records in the southwestern Great Basin
Weiquan Dong
2004, Thesis
No abstract available....
The Amphibians of Great Smoky Mountains National Park
C.K. Dodd Jr.
2004, Book
Abstract not supplied at this time...
Spatial and Temporal Patterns of Off-highway Vehicle Use at the Dove Springs OHV Open Area, California. Report prepared for the Bureau of Land Management, California State Office, Sacramento, California
J.R. Matchett, L. Gass, M.L. Brooks, A.M. Mathie, R.D. Vitales, M.W. Campagna, D. M. Miller, J.F. Weigand
2004, Report
No abstract available at this time...
Fire as an ecological process
N. G. Sugihara, J. W. van Wagtendonk, J. Fites-Kaufman
N. G. Sugihara, J. W. van Wagtendonk, J. Fites-Kaufman, K. E. Shaffer, A. E. Thode, editor(s)
2004, Book chapter, Fire in California ecosystems
This chapter investigates fire as a dynamic ecosystem process by first investigating fire in the context of general ecological theory, then discussing the concept of fire regimes, and finally by developing and applying a new framework for classifying fire regimes that better allows for the understanding of the patterns of...
A simple autocorrelation algorithm for determining grain size from digital images of sediment
D. M. Rubin
2004, Journal of Sedimentary Research (74) 160-165
Autocorrelation between pixels in digital images of sediment can be used to measure average grain size of sediment on the bed, grain-size distribution of bed sediment, and vertical profiles in grain size in a cross-sectional image through a bed. The technique is less sensitive than traditional laboratory analyses to tails...
