Index Catalog // ScholarsArchive@OSU

Don Juan Pond, Antarctica: Near-surface CaCl2-brine feeding Earth’s most saline lake and implications for Mars

Creator:: Dickson, James L., Head, James W., Levy, Joseph S., and Marchant, David R.
Abstract:: The discovery on Mars of recurring slope lineae (RSL), thought to represent seasonal brines, has sparked interest in analogous environments on Earth. We report on new studies of Don Juan Pond (DJP), which exists at the upper limit of ephemeral water in the McMurdo Dry Valleys (MDV) of Antarctica, and...
Resource Type:: Article
Full Text:: untitled Don Juan Pond, Antarctica: Near-surface CaCl2-brine

Covariant Derivatives on Null Submanifolds

Creator:: Hickethier, Don and Dray, Tevian
Abstract:: The degenerate nature of the metric on null hypersurfaces makes it difficult to define a covariant derivative on null submanifolds. Recent approaches using decomposition to define a covariant derivative on null hypersurfaces are investigated, with examples demonstrating the limitations of the methods. Motivated by Geroch’s work on asymptotically flat spacetimes,...
Resource Type:: Article
Full Text:: 2 01 1 Covariant Derivatives on Null Submanifolds Don Hickethier Department of Mathematics

Invaded range of the blackberry pathogen Phragmidium violaceum in the Pacific Northwest of the USA and the search for its provenance

Creator:: Morin, Louise, Gomez, Don R., Evans, Katherine J., Neill, Tara M., Mahaffee, Walt F., and Linde, Celeste C.
Abstract:: Field surveys in 2006 confirmed that the exotic rust fungus Phragmidium violaceum was widespread on Rubus armeniacus and Rubus laciniatus in the Pacific Northwest of the USA. The origin and dispersal pattern of this obligate biotrophic pathogen in the USA were investigated by comparing the genetic diversity and structure of...
Resource Type:: Article
Full Text:: Louise Morin • Don R. Gomez • Katherine J. Evans • Tara M. Neill • Walt F. Mahaffee • Celeste C. Linde

Factors Influencing Dissolved Copper Concentrations in Oregon Highway Stormwater Runoff

Creator:: Nason, Jeffrey A., Bloomquist, Don J., and Sprick, Matthew S.
Abstract:: Highway stormwater runoff represents a significant source of dissolved copper to surface waters. It is well established that even low concentrations of dissolved copper can be toxic to many aquatic organisms. In the Pacific Northwest of the United States, recent research has focused on the effects of low-level copper exposure...
Resource Type:: Article
Full Text:: in 1 Oregon Highway Stormwater Runoff 2 Jeffrey A. Nason1, Don J. Bloomquist2, and Matthew S

Probabilistic assessment of wildfire hazard and municipal watershed exposure

Creator:: Scott, Joe, Helmbrecht, Don, Thompson, Matthew P., Calkin, David E., and Marcille, Kate
Abstract:: The occurrence of wildfires within municipal watersheds can result in significant impacts to water quality and ultimately human health and safety. In this paper, we illustrate the application of geospatial analysis and burn probability modeling to assess the exposure of municipal watersheds to wildfire. Our assessment of wildfire exposure consists...
Resource Type:: Article
Full Text:: wildfire hazard and municipal watershed exposure Joe Scott • Don Helmbrecht • Matthew P. Thompson • David

A comparison of techniques for magnetotelluric response function estimation

Creator:: Jones, Alan G., Chave, Alan D., Egbert, Gary D., Auld, Don, and Bahr, Karsten
Abstract:: Spectral analysis of the time-varying horizontal magnetic and electric field components yields the magnetotelluric (MT) impedance tensor. This frequency dependent 2x2 complex tensor can be examined for details which axe diagnostic of the electrical conductivity distribution in the Earth within the relevant (frequency dependent) inductive scale length of the surface...
Resource Type:: Article
Full Text:: ALAN D. CHAVE, 2 GARY EGBERT, 3 DON AULD, 4 AND KARSTEN BAHR 5 Spectral analysis of the time-varying

Population dynamics of mallards breeding in eastern Washington

Creator:: Dugger, Bruce D., Coluccy, John M., Dugger, Katie M., Fox, Trevor T., Kraege, Don, and Petrie, Mark J.
Abstract:: Variation in regional population trends for mallards breeding in the western United States indicates that additional research into factors that influence demographics could contribute to management and understanding the population demographics of mallards across North America. We estimated breeding incidence and adult female, nest, and brood survival in eastern Washington...
Resource Type:: Article
Full Text:: , Department of Fisheries and Wildlife, Oregon State University, Nash Hall 104, Corvallis, OR 97331, USA DON

Prospects for Recovering Endemic Fishes Pursuant to the U.S. Endangered Species Act

Creator:: Williams, Jack E., Macdonald, Catherine A., Williams, Cindy Deacon, Weeks, Hal, Lampman, Georgina, and Sada, Don W.
Abstract:: If the success of the Endangered Species Act (ESA) is measured by the number of endangered species that have been recovered and delisted, then the act is not very successful. Only 15 species have been delisted because of recovery in the history of the ESA. The Borax Lake chub (Gila...
Resource Type:: Article
Full Text:: Cindy Deacon Williams Hal Weeks Georgina Lampman Don W. Sada Jack Williams is chief scientist for

Potential financial returns from alternative silvicultural prescriptions in second-growth stands of coastal British Columbia

Creator:: Howard, Andrew F. and Temesgen, H.
Abstract:: This paper reports the findings from a study made of the potential financial returns from nine alternative silvicultural prescriptions applied to four case-study stands of second growth in coastal British Columbia. The objectives were to compare prescriptions based on partial cutting with conventional clear-cutting and to explore the effects of...
Resource Type:: Article
Full Text:: prescriptions in second-growth stands of coastal British Columbia Andrew F. Howard and H. Temesgen Abstract

Regional variation in mtDNA of the lesser prairie-chicken

Creator:: Hagen, Christian A., Pitman, James C., Sandercock, Brett K., Wolfe, Don H., Robel, Robert J., Applegate, Roger D., and Oyler-McCance, Sara J.
Abstract:: Cumulative loss of habitat and long-term decline in the populations of the Lesser Prairie-Chicken (Tympanuchus pallidicinctus) have led to concerns for the species’ viability throughout its range in the southern Great Plains. For more efficient conservation past and present distributions of genetic variation need to be understood. We examined the...
Resource Type:: Article
Full Text:: , Nashville, Tennessee 37204. CHRISTIAN A. HAGEN1,5, JAMES C. PITMAN1,6, BRETT K. SANDERCOCK1, DON H. WOLFE2

ScholarsArchive@OSU

Don Juan Pond, Antarctica: Near-surface CaCl2-brine feeding Earth’s most saline lake and implications for Mars

Covariant Derivatives on Null Submanifolds

Invaded range of the blackberry pathogen Phragmidium violaceum in the Pacific Northwest of the USA and the search for its provenance

Factors Influencing Dissolved Copper Concentrations in Oregon Highway Stormwater Runoff

Probabilistic assessment of wildfire hazard and municipal watershed exposure

A comparison of techniques for magnetotelluric response function estimation

Population dynamics of mallards breeding in eastern Washington

Prospects for Recovering Endemic Fishes Pursuant to the U.S. Endangered Species Act

Potential financial returns from alternative silvicultural prescriptions in second-growth stands of coastal British Columbia

Regional variation in mtDNA of the lesser prairie-chicken

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