Index Catalog // ScholarsArchive@OSU

Preliminary Genomic Characterization of Ten Hardwood Tree Species from Multiplexed Low Coverage Whole Genome Sequencing

Creator:: Staton, Margaret, Best, Teodora, Khodwekar, Sudhir, Owusu, Sandra, Xu, Tao, Xu, Yi, Jennings, Tara, Cronn, Richard, Arumuganathan, A. Kathiravetpilla, Coggeshall, Mark, Gailing, Oliver, Liang, Haiying, Romero-Severson, Jeanne, Schlarbaum, Scott, and Carlson, John E.
Abstract:: Forest health issues are on the rise in the United States, resulting from introduction of alien pests and diseases, coupled with abiotic stresses related to climate change. Increasingly, forest scientists are finding genetic/genomic resources valuable in addressing forest health issues. For a set of ten ecologically and economically important native...
Resource Type:: Article
Full Text:: for Tree Molecular Genetics, Pennsylvania State University, University Park, PA, United States of

Development of Molecular Markers for Determining Continental Origin of Wood from White Oaks (Quercus L. sect. Quercus)

Creator:: Schroeder, Hilke, Cronn, Richard, Yanbaev, Yulai, Jennings, Tara, Mader, Malte, Degen, Bernd, and Kersten, Birgit
Abstract:: To detect and avoid illegal logging of valuable tree species, identification methods for the origin of timber are necessary. We used next-generation sequencing to identify chloroplast genome regions that differentiate the origin of white oaks from the three continents; Asia, Europe, and North America. By using the chloroplast genome of...
Resource Type:: Article
Full Text:: Research Station, Corvallis, Oregon, United States of America, 3 Bashkir State University, Ufa, Russia, 4

Ecological thresholds, climate extremes, and tree species' distributions across the Pacific coastal United States

Creator:: Lintz, Heather E.
Abstract:: Species' distributions across the landscape are perhaps the least understood yet most conspicuous features of life on earth. Ecologists have long studied species' distributions; yet, many questions remain about why species occur where they do. Such questions persist largely because species' distributions are complex systems with challenging properties like non-linearity,...
Resource Type:: Dissertation
Full Text:: Extremes, and Tree Species’ Distributions across the Pacific Coastal United States. Abstract

Vegetation, Bryophytes, Lichens, Environment, and Stand Dynamics in Forests of the Swan Valley, Montana

Creator:: McCune, Bruce and Antos, Joseph A.
Abstract:: We sampled vegetation, bryophytes, lichens, environment, and stand dynamics in 56 plots in the Swan Valley, Montana in 1975-1978. The data include complete inventory of trees in 375 m2 plots, with whole-plot ocular estimates of plant cover by species, transect sampling of the ground layer bryophytes and lichens with microplots,...
Resource Type:: Dataset
Full Text:: Vegetation1977 text SiteData 12 Notes2005 Notes in 2005 from Dan Roberson text Dan Roberson, Swan River State

Phytophthora Have Distinct Endogenous Small RNA Populations That Include Short Interfering and microRNAs

Creator:: Fahlgren, Noah, Bollmann, Stephanie R., Kasschau, Kristin D., Cuperus, Josh T., Press, Caroline M., Sullivan, Christopher M., Chapman, Elisabeth J., Hoyer, J. Steen, Gilbert, Kerrigan B., Grunwald, Niklaus J., and Carrington, James C.
Abstract:: In eukaryotes, RNA silencing pathways utilize 20-30-nucleotide small RNAs to regulate gene expression, specify and maintain chromatin structure, and repress viruses and mobile genetic elements. RNA silencing was likely present in the common ancestor of modern eukaryotes, but most research has focused on plant and animal RNA silencing systems. Phytophthora...
Resource Type:: Article
Full Text:: Agricultural Research Service, Corvallis, Oregon, United States of America Abstract In eukaryotes, RNA

Diverse Lifestyles and Strategies of Plant Pathogenesis Encoded in the Genomes of Eighteen Dothideomycetes Fungi

Creator:: Ohm, Robin A., Feau, Nicolas, Henrissat, Bernard, Schoch, Conrad L., Horwitz, Benjamin A., Barry, Kerrie W., Condon, Bradford J., Copeland, Alex C., Dhillon, Braham, Glaser, Fabian, Hesse, Cedar N., Kosti, Idit, LaButti, Kurt, Lindquist, Erika A., Lucas, Susan, Salamov, Asaf A., Bradshaw, Rosie E., Ciuffetti, Lynda, Hamelin, Richard C., Kema, Gert H. J., Lawrence, Christopher, Scott, James A., Spatafora, Joseph W., Turgeon, B. Gillian, de Wit, Pierre J. G. M., Zhong, Shaobin, Goodwin, Stephen B., and Grigoriev, Igor V.
Abstract:: Correction 5 Mar 2013: Ohm RA, Feau N, Henrissat B, Schoch CL, Horwitz BA, et al. (2013) Correction: Diverse Lifestyles and Strategies of Plant Pathogenesis Encoded in the Genomes of Eighteen Dothideomycetes Fungi. PLOS Pathogens 9(3): 10.1371/annotation/fcca88ac-d684-46e0-a483-62af67e777bd
Resource Type:: Article
Full Text:: , Agricultural Research Service, Purdue University, West Lafayette, Indiana, United States of America Abstract

Response of the nitrogen-fixing lichen Lobaria pulmonaria to phosphorus, molybdenum, and vanadium

Creator:: Marks, Jade A., Pett-Ridge, Julie C., Perakis, Steven S., Allen, Jessica L., and McCune, Bruce
Abstract:: Nitrogen-fixing lichens (cyanolichens) are an important source of nitrogen (N) in Pacific Northwest forests, but limitation of lichen growth by elements essential for N fixation is poorly understood. To investigate how nutrient limitation may affect cyanolichen growth rates, we fertilized a tripartite cyanobacterial lichen (Lobaria pulmonaria) and a green algal...
Resource Type:: Article
Full Text:: agricultural region (USDA Forest Service 2002, Felix et al. 2013, Felix et al. 2014). Faster growth of Lobaria

Fire effects on wetland prairie species : final report

Creator:: Clark, Deborah L., Wilson, Mark V., and Clark, Deborah Louise, 1950-
Abstract:: Wetland prairies of the Willamette Valley, considered among the rarest of Oregon’s ecosystems, are threatened by invasion of woody species and non-native species. Because of its historical importance, fire is a top choice of managers for preventing the encroachment of woody species. However, the effects of prescribed burning on present...
Resource Type:: Technical Report
Full Text:: and Idaho. Gen. Tech. Rep. INT-239. Ogden, UT. U.S. Department of Agriculture, Forest Service

Invasion by trees into a grassy bald on Marys Peak, Oregon Coast Range

Creator:: Magee, Teresa K.
Abstract:: Grassy balds are meadows that occur on or near the summits of montane peaks and ridges. The sites on which balds are located generally fall within the climatic tolerance ranges of associated tree species. This study evaluates the stability of a forest-meadow transition zone of such a bald on Marys...
Resource Type:: Masters Thesis
Full Text:: stability of a forest-meadow transition zone of such a bald on Marys Peak in the Oregon Coast Range. The

Comparative Genomics of Plant-Associated Pseudomonas spp.: Insights into Diversity and Inheritance of Traits Involved in Multitrophic Interactions

Creator:: Loper, Joyce E., Hassan, Karl A., Mavrodi, Dmitri V., Davis, Edward W., II, Lim, Chee Kent, Shaffer, Brenda T., Elbourne, Liam D. H., Stockwell, Virginia O., Hartney, Sierra L., Breakwell, Katy, Henkels, Marcella D., Tetu, Sasha G., Rangel, Lorena I., Kidarsa, Teresa A., Wilson, Neil L., van de Mortel, Judith E., Song, Chunxu, Blumhagen, Rachel, Radune, Diana, Hostetler, Jessica B., Brinkac, Lauren M., Durkin, A. Scott, Kluepfel, Daniel A., Wechter, W. Patrick, Anderson, Anne J., Kim, Young Cheol, Pierson, Leland S., III, Pierson, Elizabeth A., Lindow, Steven E., Kobayashi, Donald Y., Raaijmakers, Jos M., Weller, David M., Thomashow, Linda S., Allen, Andrew E., and Paulsen, Ian T.
Abstract:: We provide here a comparative genome analysis of ten strains within the Pseudomonas fluorescens group including seven new genomic sequences. These strains exhibit a diverse spectrum of traits involved in biological control and other multitrophic interactions with plants, microbes, and insects. Multilocus sequence analysis placed the strains in three sub-clades,...
Resource Type:: Article
Full Text:: Service, U.S. Department of Agriculture, Corvallis, Oregon, United States of America, 2 Department of

Comparative Genomics of Plant-Associated Pseudomonas spp.: Insights into Diversity and Inheritance of Traits Involved in Multitrophic Interactions

Creator:: Loper, Joyce E., Hassan, Karl A., Mavrodi, Dmitri V., Davis, Edward W., II, Lim, Chee Kent, Shaffer, Brenda T., Elbourne, Liam D. H., Stockwell, Virginia O., Hartney, Sierra L., Breakwell, Katy, Henkels, Marcella D., Tetu, Sasha G., Rangel, Lorena I., Kidarsa, Teresa A., Wilson, Neil L., van de Mortel, Judith E., Song, Chunxu, Blumhagen, Rachel, Radune, Diana, Hostetler, Jessica B., Brinkac, Lauren M., Durkin, A. Scott, Kluepfel, Daniel A., Wechter, W. Patrick, Anderson, Anne J., Kim, Young Cheol, Pierson, Leland S., III, Pierson, Elizabeth A., Lindow, Steven E., Kobayashi, Donald Y., Raaijmakers, Jos M., Weller, David M., Thomashow, Linda S., Allen, Andrew E., and Paulsen, Ian T.
Abstract:: We provide here a comparative genome analysis of ten strains within the Pseudomonas fluorescens group including seven new genomic sequences. These strains exhibit a diverse spectrum of traits involved in biological control and other multitrophic interactions with plants, microbes, and insects. Multilocus sequence analysis placed the strains in three sub-clades,...
Resource Type:: Article
Full Text:: Service, U.S. Department of Agriculture, Corvallis, Oregon, United States of America, 2 Department of

Comparative Genome Structure, Secondary Metabolite, and Effector Coding Capacity across Cochliobolus Pathogens

Creator:: Condon, Bradford J., Leng, Yueqiang, Wu, Dongliang, Bushley, Kathryn E., Ohm, Robin A., Otillar, Robert, Martin, Joel, Schackwitz, Wendy, Grimwood, Jane, MohdZainudin, NurAinIzzati, Xue, Chunsheng, Wang, Rui, Manning, Viola A., Dhillon, Braham, Tu, Zheng Jin, Steffenson, Brian J., Salamov, Asaf, Sun, Hui, Lowry, Steve, LaButti, Kurt, Han, James, Copeland, Alex, Lindquist, Erika, Barry, Kerrie, Schmutz, Jeremy, Baker, Scott E., Ciuffetti, Lynda M., Grigoriev, Igor V., Zhong, Shaobin, and Turgeon, B. Gillian
Abstract:: The genomes of five Cochliobolus heterostrophus strains, two Cochliobolus sativus strains, three additional Cochliobolus species (Cochliobolus victoriae, Cochliobolus carbonum, Cochliobolus miyabeanus), and closely related Setosphaeria turcica were sequenced at the Joint Genome Institute (JGI). The datasets were used to identify SNPs between strains and species, unique genomic regions, core secondary...
Resource Type:: Article
Full Text:: Plant Pathology, North Dakota State University, Fargo, North Dakota, United States of America, 3

How Effective Are DNA Barcodes in the Identification of African Rainforest Trees?

Creator:: Parmentier, Ingrid, Duminil, Jérôme, Kuzmina, Maria, Philippe, Morgane, Thomas, Duncan W., Kenfack, David, Chuyong, George B., Cruaud, Corinne, and Hardy, Olivier J.
Abstract:: Background: DNA barcoding of rain forest trees could potentially help biologists identify species and discover new ones. However, DNA barcodes cannot always distinguish between closely related species, and the size and completeness of barcode databases are key parameters for their successful application. We test the ability of rbcL, matK and...
Resource Type:: Article
Full Text:: , Canada, 4Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon, United

Evolving while invading: rapid adaptive evolution in juvenile development time for a biological control organism colonizing a high-elevation environment

Creator:: McEvoy, Peter B., Higgs, Kimberley M., Coombs, Eric M., Karacetin, Evrim, and Starcevich, Leigh Ann
Abstract:: We report evidence of adaptive evolution in juvenile development time on a decadal timescale for the cinnabar moth Tyria jacobaeae (Lepidoptera: Arctiidae) colonizing new habitats and hosts from the Willamette Valley to the Coast Range and Cascades Mountains in Oregon. Four lines of evidence reveal shorter egg to pupa juvenile...
Resource Type:: Article
Full Text:: Evrim Karaçetin3 and Leigh Ann Starcevich4 1 Department of Botany and Plant Pathology, Oregon State

Patterns in coastal marsh vegetation of the Juneau area, Alaska

Creator:: Stone, Catherine S.
Abstract:: A vegetation study was made of four coastal marshes near Juneau, Alaska. Results confirmed earlier studies' findings in southeast Alaska that communities or assemblages of species can be identified but from marsh to marsh these assemblages appear to have no consistent relationship to each other or to environmental "factors" such...
Resource Type:: Dissertation
Full Text:: Oregon State University in partial fulfillment of the requirements for the degree of Doctor of

The Willamette Valley (Oregon) Prairie Plant Trait Dataset

Creator:: Clark, Deborah and Wilson, Mark V.
Abstract:: The Willamette Valley (Oregon) Prairie Plant Trait Dataset is a compilation of plant traits of species important in upland prairies, wetland prairies, vernal pools, and emergent wetlands, and in the restoration of prairies and wetlands of the Willamette Valley of Oregon. These species are also found widely throughout the Pacific...
Resource Type:: Dataset
Full Text:: status for Region 9 (from US Fish and Wildlife Service, 1988), which indicate probability of occurring

Identification of Genetic Variation between Obligate Plant Pathogens Pseudoperonospora cubensis and P-humuli Using RNA Sequencing and Genotyping-By-Sequencing

Creator:: Summers, Carly F., Gulliford, Colwyn M., Carlson, Craig H., Lillis, Jacquelyn A., Carlson, Maryn O., Cadle-Davidson, Lance, Gent, David H., and Smart, Christine D.
Abstract:: RNA sequencing (RNA-seq) and genotyping-by-sequencing (GBS) were used for single nucleotide polymorphism (SNP) identification from two economically important obligate plant pathogens, Pseudoperonospora cubensis and P. humuli. Twenty isolates of P. cubensis and 19 isolates of P. humuli were genotyped using RNA-seq and GBS. Principle components analysis (PCA) of each data...
Resource Type:: Article
Full Text:: Service, Grape Genetics Research Unit, Geneva, New York, United States of America, 5 United States

Risk of Exposure to Eastern Equine Encephalomyelitis Virus Increases with the Density of Northern Cardinals

Creator:: Estep, Laura K., McClure, Christopher J. W., Vander Kelen, Patrick, Burkett-Cadena, Nathan D., Sickerman, Stephen, Hernandez, José, Jinright, Joseph, Hunt, Brenda, Lusk, John, Hoover, Victor, Armstrong, Keith, Stark, Lillian M., Hill, Geoffrey E., and Unnasch, Thomas R.
Abstract:: For a variety of infectious diseases, the richness of the community of potential host species has emerged as an important factor in pathogen transmission, whereby a higher richness of host species is associated with a lowered disease risk. The proposed mechanism driving this pattern is an increased likelihood in species-rich...
Resource Type:: Article
Full Text:: , United States of America, 2Department of Biological Sciences, Auburn University, Auburn, Alabama, United

Quantitative Trait Loci Associated with the Tocochromanol (Vitamin E) Pathway in Barley

Creator:: Graebner, Ryan C., Wise, Mitchell, Cuesta-Marcos, Alfonso, Geniza, Matthew, Blake, Tom, Blake, Victoria C., Butler, Joshua, Chao, Shiaoman, Hole, David J., Horsley, Rich, Jaiswal, Pankaj, Obert, Don, Smith, Kevin P., Ullrich, Steven, and Hayes, Patrick M.
Abstract:: The Genome-Wide Association Studies approach was used to detect Quantitative Trait Loci associated with tocochromanol concentrations using a panel of 1,466 barley accessions. All major tocochromanol types- α-, β-, δ-, γ-tocopherol and tocotrienol- were assayed. We found 13 single nucleotide polymorphisms associated with the concentration of one or more of...
Resource Type:: Article
Full Text:: State University, Corvallis, Oregon, United States of America, 2 Cereal Crops Research, USDA-ARS

The Classification of the Common Orders of Plants Found Around Corvallis

Creator:: King, Bertha Anna and Starr, Grace E.
Abstract:: In collecting our representative flowering plants, we have endeavored to secure a specimen of each common genus of annuals and biennials as well as a few shrubs. The notes, drawings, and classification of fifty of these plants constitute the main part of our thesis. Following are the classifications of various...
Resource Type:: Undergraduate Thesis
Full Text:: oak woods near the top, and the denser growth of fir on the northern side, this region supports

Concepts of Sustainability, Motivations for Pest Management Approaches, and Implications for Communicating Change

Creator:: Sherman, Jennifer and Gent, David H.
Abstract:: Impact and relevance are valued by both plant pathologists and the supporters of research and extension. Impact has been characterized as the “So what?” of research results, and in applied research in agriculture typically involves some change in human behavior. This might involve, for instance, avoidance of broad spectrum pesticides,...
Resource Type:: Article
Full Text:: hop produc- tion in the United States, the Yakima Valley in Eastern Washington and the Willamette

The response of mechanical tissue to tension in the pedicel of apple

Creator:: Horn, Elsa Ottilia
Resource Type:: Masters Thesis
Full Text:: literature was made to ascertain the present state of scientific information regarding the occurrence and

Meta-Analysis Reveals a Critical Period for Management of Powdery Mildew on Hop Cones

Creator:: Nelson, Mark E., Gent, David H., and Grove, Gary G.
Abstract:: Results of 28 field trials conducted over a 12-year period investigating management of hop powdery mildew caused by Podosphaera macularis were quantitatively summarized by meta-analysis to compare product efficacy and use patterns by mode of action as defined by Fungicide Resistance Action Committee (FRAC) groups. Availability of original observations enabled...
Resource Type:: Article
Full Text:: , Prosser, 99350; David H. Gent, United States Department of Agriculture–Agricultural Research Service

Single nucleotide polymorphism (SNP) markers associated with high folate content in wild potato species

Creator:: Bali, Sapinder, Robinson, Bruce R., Sathuvalli, Vidyasagar, Bamberg, John, and Goyer, Aymeric
Abstract:: Micronutrient deficiency, also known as the hidden hunger, affects over two billion people worldwide. Potato is the third most consumed food crops in the world, and is therefore a fundamental element of food security for millions of people. Increasing the amount of micronutrients in food crop could help alleviate worldwide...
Resource Type:: Article
Full Text:: Center, Oregon State University, Hermiston, OR, United States of America, 2 Department of Crop and Soil

Host-Selective Toxins of Pyrenophora tritici-repentis Induce Common Responses Associated with Host Susceptibility

Creator:: Pandelova, Iovanna, Figueroa, Melania, Wilhelm, Larry J., Manning, Viola A., Mankaney, Aakash N., Mockler, Todd C., and Ciuffetti, Lynda M.
Abstract:: Pyrenophora tritici-repentis (Ptr), a necrotrophic fungus and the causal agent of tan spot of wheat, produces one or a combination of host-selective toxins (HSTs) necessary for disease development. The two most studied toxins produced by Ptr, Ptr ToxA (ToxA) and Ptr ToxB (ToxB), are proteins that cause necrotic or chlorotic...
Resource Type:: Article
Full Text:: , Oregon State University, Corvallis, Oregon, United States of America, 2 United States Department of

The Effect of Iron Limitation on the Transcriptome and Proteome of Pseudomonas fluorescens Pf-5

Creator:: Lim, Chee Kent, Hassan, Karl A., Tetu, Sasha G., Loper, Joyce E., and Paulsen, Ian T.
Abstract:: One of the most important micronutrients for bacterial growth is iron, whose bioavailability in soil is limited. Consequently, rhizospheric bacteria such as Pseudomonas fluorescens employ a range of mechanisms to acquire or compete for iron. We investigated the transcriptomic and proteomic effects of iron limitation on P. fluorescens Pf-5 by...
Resource Type:: Article
Full Text:: and Plant Pathology, Oregon State University, Corvallis, Oregon, United States of America Abstract

Brown rot of fruits and fruit trees in Oregon

Creator:: Posey, Gilbert Bradley
Resource Type:: Masters Thesis
Full Text:: parts of Europe. Requests wore also sent to different Stete Experiment Stations in the United States

Yosemite region nitrogen deposition and patterns in the composition of lichen communities

Creator:: Hutten, Martin
Abstract:: This dissertation describes patterns in epiphytic macrolichen community composition along a nitrogen deposition gradient in the Yosemite region of the Sierra Nevada in California. This region is part of the largest federal air quality Class 1 designated air-shed in the western United States, covering the entire crest of the Sierra...
Resource Type:: Dissertation
Full Text:: part of the largest federal air quality Class 1 designated air-shed in the western United States

A Phylogenetic Perspective on the Individual Species- Area Relationship in Temperate and Tropical Tree Communities

Creator:: Yang, Jie, Swenson, Nathan G., Cao, Min, Chuyong, George B., Ewango, Corneille E. N., Howe, Robert, Kenfack, David, Thomas, Duncan, Wolf, Amy, and Lin, Luxiang
Abstract:: Ecologists have historically used species-area relationships (SARs) as a tool to understand the spatial distribution of species. Recent work has extended SARs to focus on individual-level distributions to generate individual species area relationships (ISARs). The ISAR approach quantifies whether individuals of a species tend have more or less species richness...
Resource Type:: Article
Full Text:: , 8Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon, United States of

An Evaluation of Putative Sympatric Speciation within Limnanthes (Limnanthaceae)

Creator:: Meyers, Stephen C., Liston, Aaron, and Meinke, Robert
Abstract:: Limnanthes floccosa ssp. floccosa and L. floccosa ssp. grandiflora are two of five subspecies within Limnanthes floccosa endemic to vernal pools in southern Oregon and northern California. Three seasons of monitoring natural populations have quantified that L. floccosa ssp. grandiflora is always found growing sympatrically with L. floccosa ssp. floccosa...
Resource Type:: Article
Full Text:: Botany and Plant Pathology, Oregon State University, Corvallis, Oregon, United States of America

Conservation of Oenothera wolfii (Onagraceae) : introducing a threatened plant into two protected locations in Oregon

Creator:: Currin, Rebecca E.
Abstract:: The showy biennial to short-lived perennial Oenothera wolfii (Munz) Raven, Dietrich & Stubbe (Wolf’s evening primrose) occurs in only a small number of isolated populations on the southern Oregon and northern California coast. This rare species is currently listed as Threatened in Oregon, and is considered a Species of Concern...
Resource Type:: Masters Thesis
Full Text:: United States, with over half of those extinctions occurring in Hawaii (Morse 1996). It is estimated

Internal transcribed spacer region evolution in Larix and Pseudotsuga (Pinaceae)

Creator:: Gernandt, David S. and Liston, Aaron
Abstract:: The nuclear ribosomal DNA (nrDNA) internal transcribed spacer (ITS) region has been characterized in the sister genera Larix and Pseudotsuga (Pinaceae). Complete sequences were obtained for seven species of Larix from North America and Eurasia and five species of Pseudotsuga from western North America and eastern Asia. ITS region lengths...
Resource Type:: Article
Full Text:: American Pseudotsuga J. H. Stone Nursery, Jackson Co., Oregon, USA Ps871, USDA Forest Service Arboretum

Cryptogam communities in forest and steppe ecosystems of Oregon, USA

Creator:: Root, Heather T.
Abstract:: I focus on addressing knowledge gaps relating to management of cryptogams in Oregon's public lands in Pseudotsuga menziesii-Tsuga heterophylla forests on the west side of the Cascade Range and dryland steppe in the Cascade Range's rainshadow. While a great deal of research has illustrated the importance of late-successional forests for...
Resource Type:: Dissertation
Full Text:: presented on June 9, 2011. Title: Cryptogam Communities in Forest and Steppe Ecosystems of Oregon, USA

Recommendations for Control of Tall Oatgrass, Poison Oak, and Rose in Willamette Valley Upland Prairies

Creator:: Wilson, Mark V. and Clark, Deborah Louise, 1950-
Abstract:: Native upland prairies, which once dominated the landscape of the Willamette Valley, are considered among the rarest of Oregon's ecosystems. Even though only remnants remain today, they harbor many rare and endangered species such as the Fender's blue butterfly and its host plant, Kincaid’s lupine. Invasion of remnant prairies by...
Resource Type:: Technical Report
Full Text:: among the rarest ecosystems in Oregon (ONHP 1983) and the United States (Noss et al. 1995). Only about

Dry coniferous forests in the Western Oregon Cascades

Creator:: Means, Joseph E.
Abstract:: Pseudotsuga menziesii dominates the forests of the Pacific Northwest. But though it is dominat, Tsuaa heteroohylla or Abies amabilis is usually climax. Many researchers have studied Pseudotsuga on the widespread mesic sites where it is seral, but few have examined the relatively rare ecosystems in which Pseudotsuga or its associate...
Resource Type:: Dissertation
Full Text:: Forest provided access to aerial photographs and other material. Many other U.S. Forest Service

Foliar respiration in an old-growth coniferous forest

Creator:: Cooper, Clifton E.
Abstract:: Foliar respiration forms a large component of the carbon balance of any coniferous forest. We examine seasonal, interannual, spatial and interspecific variation of foliar maintenance respiration in a forest in Washington, USA, with measurements made quarterly for >4 years on 400-year old trees of Pseudotsuga menziesii, Tsuga heterophylla and Thuja...
Resource Type:: Dissertation
Full Text:: Respiration in an Old-Growth Coniferous Forest. Abstract approved: Foliar respiration forms a large

A comparative study of temperate Chamaecyparis forests

Creator:: Hawk, Glenn M.
Abstract:: The objectives of this study include: (1) analysis of Chamaecyparis lawsoniana, C. taiwanensis, and C. formosensis forests including the structure, composition, and dynamics of plant communities and their environmental relationships; and (2) comparison of the temperate Chamaecyparis forests of Taiwan and the Pacific Northwest with emphasis on structural and successional...
Resource Type:: Dissertation
Full Text:: , Gasquet, and Corvallis United States Forest Service installations; the National Park Service; Menasha

Fescue taxonomy in the Pacific coast states

Creator:: Wilson, Barbara L.
Abstract:: Accurate taxonomy is essential to preservation and management of native grasses. Four problems in fescue taxonomy were investigated: the identity of the native fescue that dominates western Oregon and Washington prairies, the relationship of native Festuca roemeri to closely related grasses, the status of F. howellii and F. washingtonica, and...
Resource Type:: Dissertation
Full Text:: the Pacific Coast States by Barbara L. Wilson A THESIS submitted to Oregon State University in

Identification and Occurrence of Sweet Cherry (Prunus avium) Virus and Virus-Like Diseases in Various Regions and Orchards of Oregon

Creator:: Reinhold, Lauri A.
Abstract:: There are over 35 known virus and virus-like diseases of sweet cherry (Prunus avium), some with potential to cause severe economic impact by reducing vegetative growth, vigor, and/or quality of fruit. Oregon is the second-ranked state for sweet cherry production in the United States with 13,000 acres and $70.8 million...
Resource Type:: Dissertation
Full Text:: United States with 13,000 acres and $70.8 million in production value. Statewide surveys were conducted

Responses of forest understory plants to burial by volcanic tephra from Mount St. Helens, Washington

Creator:: Antos, Joseph A.
Abstract:: The effects of burial by tephra (volcanic aerial ejecta) on forest understory plants were examined northeast of Mount St. Helens, Washington, in the area where the 18 May 1980 eruption deposited tephra but did not destroy canopy trees. At six sites along a tephra depth gradient from 2-15 cm, understory...
Resource Type:: Dissertation
Full Text:: Science Foundation, the USDA Science and Education Administration, and the U.S. Forest Service, Pacific

The epidemiology of sudden oak death in Oregon forests

Creator:: Peterson, Ebba K.
Abstract:: The phytopathogen Phytophthora ramorum (Werres, DeCock & Man in't Veld), causal agent of Sudden Oak Death (SOD) of oaks (Quercus spp.) and tanoaks (Notholithocarpus densiflorus syn. Lithocarpus densiflorus), is established in coastal forests of the western United States. Since the discovery of SOD in the Douglas-fir / tanoak forests of...
Resource Type:: Dissertation
Full Text:: . Lithocarpus densiflorus), is established in coastal forests of the western United States. Since the

Fire history of the ponderosa pine forests of the Warm Springs Indian Reservation, Oregon

Creator:: Soeriaatmadja, Roehajat Emon, 1936-
Abstract:: Fire has played a prominent role in the development and character of the ponderosa pine forests in western North American. Its records are written in the scars of trees that have survived the fire. Careful studies of these fire-scars may be used as a means of reconstructing the fire history...
Resource Type:: Dissertation
Full Text:: , Lexington, Kentucky, who made possible the opportunity to study in the United States of America. I

An analysis of montane forest vegetation on the east flank of the central Oregon Cascades

Creator:: West, Neil E.
Abstract:: Montane forest vegetation as it occurs on the east flank of the central Oregon Cascades has provided excellent conditions for a "natural experiment" in the use of various methodologies in studying vegetational distribution. This "experiment" has reflected on some theory and practice for the discipline of plant synecology. Detailed descriptions,...
Resource Type:: Dissertation
Full Text:: establishment of United States Forest Service administration for the Cascade Forest Reserve. No grazing is

Characteristics of soil organic matter in two forest soils

Creator:: Crow, Susan E.
Abstract:: Soil organic matter (SOM) is the terrestrial biosphere's largest pool of organic carbon (C) and is an integral part of C cycling globally. Soil organic matter composition typically can be traced directly back to the type of detrital inputs; however, the stabilization of SOM results as a combination of chemical...
Resource Type:: Dissertation
Full Text:: : Characteristics of Soil Organic Matter in Two Forest Soils Abstract approved Soil organic matter (SOM) is the

Riparian lichens of northern Idaho

Creator:: Hutchinson, Jenifer L.
Abstract:: Riparian forests in the Idaho Panhandle, north of Whitebird, were surveyed for rare riparian lichen species. The region was stratified into nine geographic units and by stream size. Eighty-one plots were surveyed for lichen community, stand and river characteristics. Variables important to lichen community composition included regional differences, elevation, climatic...
Resource Type:: Masters Thesis
Full Text:: United States in general (Janovsky-Jones 1997), as compared to the historical distribution of riparian

Shrub epiphyte communities in relation to stand management in forests of western Oregon

Creator:: Rosso, Abbey L.
Abstract:: This dissertation describes the epiphyte communities on tall shrubs in forests of western Oregon, with a focus on potential effects of management practices on these communities. Shrubs and other hardwoods have recently gained recognition as hotspots of diversity for epiphytes in young conifer forests of the region. Yet little is...
Resource Type:: Dissertation
Full Text:: of the region. Yet little is known about how shrub epiphytes differ among stand types or in response

Epidemic Dynamics of Sudden Oak Death in the Forests of Oregon

Creator:: Carson, Adam
Abstract:: Sudden Oak Death (SOD) is a forest disease caused by the oomycete pathogen Phytophthora ramorum, and infects trees in the Western United States and Europe. This generalist pathogen can infect over 130 species of plants, and causes rapid mortality in tree species in the Fagaceae. Sexual reproduction is thought to...
Resource Type:: Masters Thesis
Full Text:: suitability for establishment of Phytophthora ramorum within the contiguous United States. Forest Ecology

Bioindication of air quality in forests of northern and central California using epiphytic macrolichen communities

Creator:: Jovan, Sarah
Abstract:: The unifying purpose of this dissertation was to describe, model, and map relationships between epiphvtic macrolichen communities and air quality in Ibrests of northern and central California. First, multivariate analyses were used to subdivide the large study area into three model areas with similar climate, topography, and lichen communities: the...
Resource Type:: Dissertation
Full Text:: forest health in the region. More basic research is needed. however, to determine whether lichens are

A revision of Juncus subgenus genuini (Juncaceae) in the Pacific states

Creator:: Lint, Harold LeRoy
Abstract:: A study was made of the subgenus Genuini of the genus Juncus in the Pacific States, California, Oregon and Washington. Extensive morphological comparisons, geographical distributions, habitat differences and observations of apparent presence or absence of natural hybrids provided the major data sources. Cytological studies were made, but were inconclusive. Eleven...
Resource Type:: Dissertation
Full Text:: taxa in the Pacific region of the United States that have long been a source of confusion to

Distribution of understory species in relation to maximum and minimum tree influence in the montane forest of the Central Oregon Cascades

Creator:: Robinson, Andrew Frederick, Jr.
Abstract:: Twenty sites of uniform topography and soil were select ed in the montane forest found on the East flank of the Central Oregon Cascades. These sites were located along a vegetational gradient composed of five plant communities: Abies/Pachistima, Pinus/Ceanothus, Pinus Arctostaphylos-Purshia, Pinus/Purshia/Festuca, and Juniperus Festuca. An attempt was made to...
Resource Type:: Dissertation
Full Text:: area came under Forest Service control in 1905 (Brogan, 1964). No grazing has been permitted in this

Pathogenicity and Virulence of Pythium Species Obtained from Forest Nursery Soils on Douglas-Fir Seedlings

Creator:: Weiland, Jerry E., Beck, Bryan R., and Davis, Anne
Abstract:: Pythium species are common soilborne oomycetes that occur in forest nursery soils throughout the United States. Numerous species have been described from nursery soils. However, with the exception of P. aphanidermatum, P irregulare, P. sylvaticum, and P ultimum, little is known about the potential for other Pythium species found in...
Resource Type:: Article
Full Text:: soilborne pathogens limiting seedling production in the Pacific Northwest (PNW) region of the United States

Epidemiological insights into Armillaria mellea root rot in a managed Ponderosa pine forest

Creator:: Shaw, Charles G. (Charles Gardner) 1948-
Abstract:: Root rot of ponderosa pine caused by Armillaria mellea was studied in a pine forest that had been under management for 30 years in Klickitat County, Washington. Information sources included disease survey, detailed observation and description of specific disease situations, and examination of roots in situ and removed. Roughly circular...
Resource Type:: Dissertation
Full Text:: Affairs (Yakima Indian Reservation), the Washington State Division of Natural Resources, the U. S. Forest

2006 Integrated pest management resource guide

Creator:: Jepson, Paul C., Brewer, Linda J., Jepson, Susan B., and Oregon State University. Extension Service
Abstract:: This publication is offered as a reference to Integrated Pest Management (IPM) resources available to Oregon growers. It highlights university, federal, state, and private services and resources that provide support to growers in the implementation of IPM programs. The Guide consists of five sections: • An introduction to the National...
Resource Type:: Technical Report
Full Text:: ://berrygrape.oregonstate.edu/ IPM resources in the western United States USDA Western Region IPM Center Administers regional

Forest structure and regeneration in the Tsuga heterophylla - Abies amabilis transition zone, central Western Cascades, Oregon

Creator:: Stewart, Glenn H.
Abstract:: The dynamics of stands in the mid-elevation old-growth Douglas-fir (Pseudotsuga menziesii) forests of the central western Oregon Cascade Range were investigated using stand structure analysis. Trees with different growth rates were commonly present in the same stand, which resulted often in a weak correlation between tree diameter and age. Thus,...
Resource Type:: Dissertation
Full Text:: Zealand Government and NZ Forest Service for the opportunity to study at Oregon State University. Many

Phytophthora ramorum within an Oregon tanoak forest : quantifying inoculum within canopy throughfall vs. soil splash

Creator:: Benemann, Silvia, E.
Abstract:: Phytophthora ramorum continues to cause extensive mortality of tanoaks in southwestern Oregon. Rain readily washes inoculum down through the canopy, causing new infections on the lower parts of the tree and neighboring host plants. Although this aspect of dispersal is well understood, the relative importance of infested soil and leaf...
Resource Type:: Masters Thesis
Full Text:: Department of Agriculture (ODA), Oregon State University (OSU), and USDA Forest Service (USDA-FS), was

Twenty-one years of secondary succession in Pseudotsuga forests of the western Cascade Range, Oregon

Creator:: Halpern, Charles B.
Resource Type:: Dissertation
Full Text:: abundance of all vascular plant species was recorded in plots representing six initial forest communities

An investigation of vegetation : hydrology interactions in watershed 1 at the H.J. Andrews Experimental Forest

Creator:: Bredensteiner, Kim C.
Abstract:: For management purposes, it would be useful to be able to predict streamflow response to forest practices in small, unmonitored basins. The primary objective of this study is to investigate the influence of early successional vegetation on summer streamflow levels. The long-term data records from watershed 1 at the H.J....
Resource Type:: Masters Thesis
Full Text:: Science, Oregon State University, and the U.S. Forest Service Pacific Northwest Research Station

Vegetation and fire history of a Ponderosa pine-white fir forest in Crater Lake National Park

Creator:: McNeil, Robert Curlan
Resource Type:: Masters Thesis
Full Text:: , Financial support for this research was provided by the National Park Service. The Oregon State University

Lichen response to the environment and forest structure in the western Cascades of Oregon

Creator:: Martin, Erin P.
Abstract:: Lichens are an important part of the biota in western Oregon forests, where they perform valuable ecological roles and contribute significantly to biodiversity. Lichens in western Oregon are threatened by a number of factors including air pollution and land use practices. If we wish to maintain the persistence of lichens...
Resource Type:: Dissertation
Full Text:: State University and USDA Forest Service for providing me financial support through teaching and

Epidemiology and population biology of Inonotus tomentosus as a pathogen of forests of British Columbia

Creator:: Lewis, Katherine JoAnn
Abstract:: The root disease fungus Inonotus tomentosus, common in the old growth boreal forests of British Columbia, poses a threat to the health of second growth forests established on sites with a previous history of root disease. Colonized stumps occur in groups of 1 to 6; the groups are clumped within...
Resource Type:: Dissertation
Full Text:: causes significant damage to pine in the southeastern United States. The final study (Chapter VI) was

Impacts of ponderosa pine forest restoration treatments on the ectomycorrhizal fungal community and fine root biomass in the Blue Mountains of Oregon

Creator:: Smith, Jane E. (Jane Elizabeth)
Abstract:: Before the arrival of Euro-Americans, the inland Pacific Northwest was settled by native people whose frequent intentional burning of the landscape promoted open stands dominated by large fire-resistant ponderosa pine. Fire suppression for nearly a century, livestock grazing, and logging of the largest trees has resulted in forests characterized by...
Resource Type:: Dissertation
Full Text:: United States Forest Service (Biswell 1989, Arno and Allison-Bunnell 2002). The park-like appearance of

Description and classification of the forests of the upper Illinois River drainage of Southwestern Oregon

Creator:: Atzet, Thomas
Abstract:: The purpose of this study was to develope a plant community classification within the Siskiyou mountains, a small range within the Klamath geological province well known for its geologic and floristic diversity. Forest land managers have expressed the need for identification of basic Land classes that will aid in the...
Resource Type:: Dissertation
Full Text:: Forest Service offered monitary support for the project and provided office space at the Forestry

Canopy epiphyte studies in the central Oregon Cascades : implications for the management of Douglas-fir forests

Creator:: Sillett, Stephen Charles
Abstract:: This thesis includes four separate studies. The first two studies assessed edge effects in a 700-year-old forest. After 20 years of exposure, epiphyte assemblages on the clearcut edge were similar to those of the forest interior, but there were some differences in vertical distribution patterns. Several species restricted to the...
Resource Type:: Dissertation
Full Text:: first two studies assessed edge effects in a 700-year-old forest. After 20 years of exposure, epiphyte

The location, composition, and structure of old-growth forests of the Oregon coast range

Creator:: Juday, Glenn Patrick
Resource Type:: Dissertation
Full Text:: . Forest Service were prompt in thoroughly sharing imagery, maps, and direction to information sources

The fate of organic and inorganic nitrogen inputs in an old-growth forest of the central Oregon Cascade Range

Creator:: Holub, Scott M.
Abstract:: Forests in the Pacific Northwest receive very little nitrogen through atmospheric deposition and thus studying the nitrogen cycle in this region can provide insights into how the unpolluted nitrogen cycle functions. I examined the fate of organic nitrogen versus inorganic nitrogen and the effect of tamlins on N retention by...
Resource Type:: Dissertation
Full Text:: W. Stone, the Hi. Andrews working group, USDA-Forest Service Pacific Northwest Region Air Resources

Factors affecting the inoculum potential of VA and ectomycorrhizal fungi in forest soils of southwest Oregon and northern California

Creator:: Parke, Jennifer Lee
Resource Type:: Dissertation
Full Text:: Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, Corvallis, Oregon 97331

The nature of Fusarium exclusion from coniferous forest soils : evidence of differential microbial involvement in forest vs. nursery soils

Creator:: Schisler, David Albert
Resource Type:: Masters Thesis
Full Text:: Pacific Northwest. Forest sites were located in the region from Yakima County, Washington, to Benton

Castilleja and Pedicularis are confirmed as telial hosts for white pine blister rust in whitebark pine ecosystems of Oregon and Washington

Creator:: Mulvey, Robin L.
Abstract:: The primary objective of this research was to determine if native species within the genera Castilleja and Pedicularis are naturally infected by white pine blister rust (Cronartium ribicola) in whitebark pine ecosystems of the Oregon and Washington Cascade Range. Secondary objectives were to monitor the phenology of aecial and telial...
Resource Type:: Masters Thesis
Full Text:: Forest Service were enthusiastic sources of information, support and resources. Bryce Richardson (USDA

Live plant imports: the major pathway for forest insect and pathogen invasions of the US

Creator:: Liebhold, Andrew M., Brockerhoff, Eckehard G., Garrett, Lynn J., Parke, Jennifer L., and Britton, Kerry O.
Abstract:: Trade in live plants has been recognized worldwide as an important invasion pathway for non-native plant pests. Such pests can have severe economic and ecological consequences. Nearly 70% of damaging forest insects and pathogens established in the US between 1860 and 2006 most likely entered on imported live plants. The...
Resource Type:: Article
Full Text:: of non-native forest insects in the United States. PLoS ONE 6: e24587. Benedict WV. 1981. History of

Factors determining species composition of post-disturbance vegetation following logging and burning of an old growth Douglas-fir forest

Creator:: Clark, Deborah Louise, 1950-
Resource Type:: Masters Thesis
Full Text:: field succession in the 29 Northeast United States can also be partially explained by sources of

Interactions between nitrogen, phosphorus, and molybdenum in forest soils and cyanobacterial lichen in the Oregon Coast Range

Creator:: Marks, Jade A.
Abstract:: Molybdenum is an essential component of biogeochemical cycling, most notably as a component of the nitrogenase enzyme used in biological nitrogen (N) fixation. While the important role of phosphorus (P) in limiting N fixation in ecosystems has been well documented, occurrence and prevalence of molybdenum (Mo) limitation is largely unknown....
Resource Type:: Masters Thesis
Full Text:: Page B1: Significance tests for state factors and molybdenum concentrations in foliage, forest

The structure and dynamics of old-growth Sitka spruce (Picea sitchensis) forest of the Oregon Coast Range

Creator:: Quaye, Eric Charles
Abstract:: The objectives of this study are to: 1) study the variations among stands of old-growth Sitka spruce forest located within a relatively restricted geographical area, 2) determine the relationship between species distribution, vegetational pattern, and such site factors as slope and aspect, and 3) ascertain the abruptness of phytosociological change...
Resource Type:: Dissertation
Full Text:: being in a steady state. Recognition of this steady state condition in forest communities is commonly

An evaluation of the invasion potential of Kochia prostrata (forage kochia) in southwestern Idaho, USA

Creator:: Gray, Erin C.
Abstract:: Purposeful introductions of exotic species for rehabilitation efforts following wildfire are common on rangelands in the western U.S., though potential ecological impacts of introduced species in novel environments are often poorly understood. One such introduced species, Kochia prostrata (L.) Schrad (forage kochia) has been seeded on over 200,000 ha throughout...
Resource Type:: Masters Thesis
Full Text:: thousands of hectares of public lands in this region, the majority of which are managed by the United

Soil fungal hyphal dynamics and seasonal hypogeous sporocarp production in western Oregon Douglas-fir forests

Creator:: Hunt, Gary, 1945-
Abstract:: Total length and biomass of fungal mycelium in the soil of a young Douglas-fir stand in the central Oregon Coast Range were estimated over 27 months with the agar-film technique. In a second study, phenology and taxonomy of hypogeous (belowground) sporocarps were studied over 32 months in a nearby, young...
Resource Type:: Dissertation
Full Text:: without the financial support of the National Science Foundation and cooperation of the United States

Effects of variation in ecosystem carryover on biodiversity and community structure of forest floor bryophytes and understory vascular plants : a retrospective approach

Creator:: Traut, Bibit Halliday
Resource Type:: Masters Thesis
Full Text:: : Effects of Variation in Ecosystem Carryover on Biodiversity and Community Structure of Forest Floor

Analysis and prediction of patterns in lichen communities over the western Oregon landscape

Creator:: Peterson, Eric B.
Abstract:: The diverse lichen flora of the Pacific Northwest is being impacted by population growth and by forest management practices. Accumulating information about our lichen flora will improve our conservation strategies. This dissertation first collects information to improve our understanding of how lichen communities vary among forests of differing structure, and...
Resource Type:: Dissertation
Full Text:: forest management practices. Accumulating information about our lichen flora will improve our

The source area for coarse woody debris in small streams in western Oregon and Washington

Creator:: McDade, Mary Helen
Abstract:: Large organic debris has important biological and physical roles within the stream ecosystem. In order to determine the source area of large organic debris in streams, thirty-nine streams in the Cascade and Coast Ranges of Oregon and Washington were sampled. The distance from point-of-origin to channel was measured for thirty...
Resource Type:: Masters Thesis
Full Text:: from Forest Sciences Data Bank, Quantitative Sciences Group, Forest Science Department, Oregon State

The effects of defoliation on Bromus tectorum seed production and growth

Creator:: Mayer, Kara Hempy
Abstract:: Cheatgrass (Bromus tectorum L.) is a widespread exotic weed in the Intermountain sagebrush steppe. An annual grass, it is highly prolific and very competitive with native perennial grass seedlings. A clipping experiment carried out at two cheatgrass-dominated sites (Lincoln Bench and Succor Creek) in eastern Oregon analyzed effects of defoliation...
Resource Type:: Masters Thesis
Full Text:: the United States Geological Survey and the Department of Botany and Plant Pathology, Oregon State

The Role of Plant-soil Feedback in the Invasion of Brachypodium sylvaticum in Douglas-fir Forests

Creator:: Esterson, Andrew
Abstract:: Invasive plants have the capacity to transform landscapes and alter ecosystem function, causing significant economic and ecological damage. These effects include displacement and reduction of native flora and fauna, altered fire regimes, modification of biotic and abiotic soil properties, as well as local, regional, and global economic impacts. With such...
Resource Type:: Masters Thesis
Full Text:: while gallivanting around the United States with no direct plan, thanks for your support and love

Lichen Studies of Tropical Dry Forest: A Systematic and Ecological Approach

Creator:: Miranda-González, Ricardo
Abstract:: In recent years, our ecological knowledge of tropical dry forests has increased dramatically. However, whole components of the ecosystem, like lichenized fungi, remain mostly unknown. Crustose lichens in these forests are so abundant, that they are responsible for the characteristic appearance of a “white bark forest” during the dry season....
Resource Type:: Dissertation
Full Text:: Dry Forest: A Systematic and Ecological Approach Abstract approved

Epiphytic macrolichens in relation to forest management and topography in a western Oregon watershed

Creator:: Berryman, Shanti D.
Abstract:: This dissertation describes patterns in epiphytic macrolichen community composition, diversity, and biomass across various stand types in the Blue River watershed of western Oregon. It first examines the relative importance of ecological factors such as stand age, remnant tree retention, and topography to lichen communities in the landscape. It then...
Resource Type:: Dissertation
Full Text:: Pathology presented on October 8, 2002. Title: Epiphytic Macrolichens in Relation to Forest Management

Phytosanitation of Douglas-fir (Pseudotsuga menziesii) logs to mitigate the risk of artificially disseminating Phytophthora ramorum within the global trade of timber

Creator:: Hulbert, Joseph M.
Abstract:: Phytophthora ramorum is a plant pathogen that was accidentally introduced to the United States. This invasive microorganism has killed over a million trees in California and Oregon, and continues to spread to new areas. Diseased areas have been nationally quarantined to prevent further spread and more than ninety countries include...
Resource Type:: Masters Thesis
Full Text:: United States, Pimentel et al. (2000) noted more than 20 known nonindigenous forest pathogens and

Autecology, reproductive ecology, and demography of Astragalus australis var. olympicus (Fabaceae)

Creator:: Kaye, Thomas N.
Abstract:: The goal of this study was to gather information on the autecology, reproductive ecology, and population dynamics of Astragalus australis var. olympicus as a baseline for conservation strategies and to help explain its restricted range. Approximately four thousand individuals occurred in four known population centers in the Olympic Mountains, Olympic...
Resource Type:: Masters Thesis
Full Text:: Oregon State University in partial fulfillment of the requirements for the degree of Master of Science

Understory herb and shrub responses to root trenching, pre-commercial thinning, and canopy closure in Douglas-fir forest of the western Cascades, Oregon

Creator:: Lindh, Briana C.
Abstract:: This thesis examines factors limiting understory herb presence and flowering in young second-growth Douglas-fir (Pseudotsuga menziesii) forests on the west side of the Cascade Mountains, Oregon, USA. I studied the belowground effects of canopy trees on understory herbs and shrubs in old-growth forests using trenched plots from which tree roots...
Resource Type:: Dissertation
Full Text:: USDA Forest Service Blue River Ranger District provided maps, historical records, advice and

Spatial and chronological patterns of Purshia tridentata as influenced by Pinus ponderosa overstory

Creator:: Sherman, Robert James
Abstract:: Twelve sites of uniform topography and soils were selected in the Pinus ponderosa/Purshia tridentata/Festuca idahoensis Association. These sites were located in the rain shadow on the east flank of the Oregon Cascades. A fire history in the form of fire scars on ponderosa pine was available for nine of these...
Resource Type:: Masters Thesis
Full Text:: precipitation records from the U. S. Forest Service Ranger Station at Sisters (Table 1). In general, Sisters

Microbial analysis of coniferous forest and nursery soils : effects of ectomycorrhizae, volatiles, and humic-rich organic substrates

Creator:: Schisler, David Albert
Abstract:: Fusarium spp. frequent conifer nursery soils yet are rarely recovered from coniferous forest soils. Experiments were performed to determine what influence humic-rich organic amendments and volatiles from soil, ectomycorrhizal fungi and ectomycorrhizae have on the populations of several physiologic and taxonomic microbial groups potentially related to this phenomenon. A comparative...
Resource Type:: Dissertation
Full Text:: Microbial analysis of coniferous forest and nursery

Strobilus production and growth of Pacific yew under a range of overstory conditions in western Oregon

Creator:: DeFazio, S. P., Vance, N. C., and Wilson, M. V.
Abstract:: Strobilus production, growth, and morphology of Pacific yew (Taxus brevifolia Nutt.) were examined at three sites in the Cascade Mountains and one site in the Willamette Valley of western Oregon. Strobilus production on branch segments was positively associated with overstory openness for male and female trees at all four sites...
Resource Type:: Article
Full Text:: and management of Pacific yew. USDA Forest Service, Pacific Northwest Region, Portland, Oreg. Veres

Characterization of fungal and bacterial communities associated with mat-forming ectomycorrhizal fungi from old-growth stands in the H.J. Andrews Experimental Forest

Creator:: Hesse, Cedar N.
Abstract:: Mat-forming ectomycorrhizal (EcM) fungi represent a prevalent constituent of many temperate forest ecosystems and create dramatic changes in soil structure and chemistry. EcM mat soil have been shown to have increased microbial respiration rates and have been hypothesized to harbor unique assemblages of fungi and bacteria. The objectives of this...
Resource Type:: Dissertation
Full Text:: . Andrews Experimental Forest Abstract approved

Phytophthora ramorum colonizes tanoak xylem and is associated with reduced stem water transport

Creator:: Parke, J. L., Oh, E., Voelker, S., Hansen, E. M., Buckles, G., and Lachenbruch, Barbara
Abstract:: Isolation, detection with diagnostic polymerase chain reaction (PCR), and microscopy demonstrated the presence of Phytophthora ramorum in the sapwood of mature, naturally infected tanoak (Lithocarpus densiflorus) trees. The pathogen was strongly associated with discolored sapwood (P < 0.001), and was recovered or detected from 83% of discolored sapwood tissue samples....
Resource Type:: Article
Full Text:: B. Lachenbruch First and fifth authors: Department of Crop and Science, Oregon State University

Fungal endophyte diversity in foliage of native and cultivated Rhododendron species determined by culturing, ITS sequencing, and pyrosequencing

Creator:: Raizen, Nathaniel L.
Abstract:: Western Oregon is home to native Rhododendron species and is the center for cultivated Rhododendron production in the United States. These Rhododendron spp. are known to be infected with fungal endophytes. However, the community structure of these endophytes in native and cultivated Rhododendron is poorly understood. Our study targeted the...
Resource Type:: Masters Thesis
Full Text:: Northwest region of the United States both ecologically, given the presence of three species native to the

Susceptibility of golden chinquapin (Chrysolepis chrysophylla) to Phytophthora cambivora

Creator:: Saavedra, Angel Luis
Abstract:: In early 2000, unusual mortality of a native North American tree, golden chinquapin, was reported by the USDA-Forest Service. Dying trees exhibited girdling cankers in the inner bark of the lower bole, branch flagging and defoliation. Isolations from necrotic tissues and soil associated with diseased or killed trees yielded Phytophthora...
Resource Type:: Masters Thesis
Full Text:: . Hepting, G. (1971). Diseases of Forest and Shade Trees of the United States. USDA Agriculture Handbook No

Seasonality as a driving factor of decomposition pathways in both meadows and forests : an exploration across a gradient of climate in Oregon

Creator:: Colby, Samantha E.
Abstract:: Soil food webs process the majority of terrestrial carbon, and influence overall ecosystem function. A primary distinction among soil food webs is based on fungal versus bacterial pathways of decomposition; these lead to fundamentally different soil function, and are expected to differ in dominance between meadows and forests. This assumption...
Resource Type:: Masters Thesis
Full Text:: biome prouction over a heterogeneous region in the western United States. Biosciences Discussions, 4

Synecology of the white-oak (Quercus garryana Douglas) woodlands of the Willamette Valley, Oregon

Creator:: Thilenius, John F., 1931-
Abstract:: Quercus garryana dominated plant communities are found in the interior coastal valleys and on foothills from southeastern Vancouver Island, British Columbia, south to San Francisco, California. They occur as savannas, intermixed with a variety of conifers, and in almost pure stands. The diversity of habitats occupied by the species and...
Resource Type:: Dissertation
Full Text:: forest show considerable variation and intergradation. Changes are a matter of shifts in species

Silviculture Impacts and Population Genomics of Coniferiporia sulphurascens, the Causal Agent of Laminated Root Rot

Creator:: McMurtrey, Shawn
Abstract:: Within the Pacific Northwest, USA, root diseases of conifers are a major forest health concern. These diseases are primarily caused by basidiomycete fungi. These fungal associates play a vital role in carbon sequestration but also have a significant negative economic impact within the timber industry. As a result, research on...
Resource Type:: Masters Thesis
Full Text:: , Pretzsch et al. 2008). The United States Forest Service uses the Forest Vegetation Simulator (FVS) as a

Contrasting Epiphytic and Ground Layer Macrolichen Communities along the Coast-to-inland Climatic Gradient in Oregon

Creator:: Glauser, Abby L.
Abstract:: Cyanolichens, lichens with a cyanobacterial photobiont, benefit our ecosystems by the fixation of atmospheric nitrogen into a usable form for other organisms. They are highly sensitive to air pollution and require liquid water for photosynthesis. Many cyanolichen species frequently occur on the ground in the Pacific Northwest, however, most macrolichen...
Resource Type:: Masters Thesis
Full Text:: Forest Service on-grid lichen plots. It was a long process and I couldn’t have done it without you! And

Mycorrhizal fungi and their relationship to plant succession in subalpine habitats

Creator:: Cazares, Efren
Resource Type:: Dissertation
Full Text:: -8717427 and the U. S. Forest Service, Pacific Northwest Research Station. Personnel of the Wenatchee

Lichen Functional Trait Variation Along an East-West Climatic Gradient in Oregon and Among Habitats in Katmai National Park, Alaska

Creator:: Spickerman, Kaleigh
Abstract:: Functional traits of vascular plants have been an important component of ecological studies for a number of years; however, in more recent times vascular plant ecologists have begun to formalize a set of key traits and universal system of trait measurement. Many recent studies hypothesize global generality of trait patterns,...
Resource Type:: Masters Thesis
Full Text:: collected from 166 USDA Forest Service program for Forest Inventory and Analysis (FIA) plots. These plots

Phytophthora species and riparian alder tree damage in western Oregon

Creator:: Sims, Laura L.
Abstract:: The genus Phytophthora contains some of the most destructive pathogens of forest trees, including the most destructive pathogen of alder in recent times, Phytophthora alni. Alder trees were reported to be suffering from canopy dieback in riparian ecosystems in western Oregon, which prompted a survey of alder health and monitoring...
Resource Type:: Dissertation
Full Text:: Program of the USDA Forest Service, Pacific Northwest Region, began. Alder trees were

Irrigated crop research in Oregon's Columbia Basin : 1981 research report

Creator:: Oregon State University. Agricultural Experiment Station and Columbia Basin Agricultural Research Center
Abstract:: Published July 1981. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Resource Type:: Technical Report
Full Text:: County Extension Agents, Oregon State University Extension Service, Hermiston, Oregon 97838 11 one

Candidate Genes Associated with Blister Rust Resistance in Whitebark Pine (Pinus albicaulis) Revealed through de novo Transcriptome Assembly and Differential Gene Expression Analysis

Creator:: Bair, Zolton J.
Abstract:: Whitebark pine (Pinus albicaulis) is an iconic North American high-elevation tree species currently threatened by climate change, mountain pine beetle, and white pine blister rust (WPBR), a lethal disease caused by the non-native fungal pathogen Cronartium ribicola. In collaboration with the USDA Forest Service Dorena Genetic Resource Center, germplasm was...
Resource Type:: Dissertation
Full Text:: collaboration with the USDA Forest Service Dorena Genetic Resource Center, germplasm was collected from

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