Index Catalog // ScholarsArchive@OSU

Why pest plant control and native plant establishment failed : a restoration autopsy

Creator:: Wilson, Mark V., Ingersoll, Cheryl A., Clark, Deborah Louise, 1950-, and Wilson, Mark G.
Abstract:: Explaining restoration failure can be as important as touting success. We used a series of studies to understand the failure of techniques commonly used to restore wetland prairies in the Willamette Valley of western Oregon. Burning, fallowing, and solarization (covering tilled plots with plastic sheeting to heat the soil) had...
Resource Type:: Article
Full Text:: Resource Program of the City of Portland (Oregon) Park & Recreation Bureau. His current work focuses on

Management of Tall Oatgrass Arrhenatherum elatius in Willamette Valley Prairies: Preliminary Report. A component of the project Restoration and Vegetation Management of Fender's Blue Butterfly Habitats

Creator:: Clark, Deborah Louise, 1950- and Wilson, Mark V.
Abstract:: Native 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 rare and endangered species such as the Fender's blue butterfly (Icaricia icariodes fenderi) and its preferred host plant, Kincaid's lupine (Lupinus sulphureus ssp....
Resource Type:: Technical Report
Full Text:: report on file at the Oregon Field Office of The Nature Conservancy, Portland, Oregon. Maret, M. 1996

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:: burning. Report to the Oregon Field Office of The Nature Conservancy, Portland, Oregon. Maret, M. P

West Eugene Native Wetland Restoration Research Project: Seed Dormancy, Germination, and Establishment

Creator:: Wilson, Mark V., Ingersoll, Cheryl A., and Clark, Deborah Louise, 1950-
Abstract:: Seed size, abundance, viability, dormancy, and germination requirements strongly influence plant establishment and therefore are important considerations in restoration of native vegetation. These characteristics provide criteria for selection of suitable species, development of collection and pretreatment methods, and determination of seeding densities. The first set of objectives of this study...
Resource Type:: Technical Report
Full Text:: in the west Eugene area. Collection dates were set to try to match periods of peak seed ripeness. In

Controlling woody vegetation in wetland prairies, 1994-2001

Creator:: Clark, Deborah Louise, 1950-
Abstract:: Wetland prairies of the Willamette Valley, among the rarest of Oregon’s ecosystems, are threatened by invasion of woody species and non-native pest species. Because fire has been important in maintaining Willamette Valley prairies for at least 1000 years, prescribed burning is a top choice of managers for preventing encroachment of...
Resource Type:: Technical Report
Full Text:: Share agreement between the Bureau of Land Management, Coast Range Area, Eugene, OR and Oregon State

Controlling woody vegetation in wetland prairies, 1994-1999

Creator:: Clark, Deborah Louise, 1950- and Wilson, Mark V.
Abstract:: Wetland prairies of the Willamette Valley, among the rarest of Oregon’s ecosystems, are threatened by invasion of woody species and non-native pest species. Because fire has been important in maintaining Willamette Valley prairies for at least 1000 years, prescribed burning is a top choice of managers for preventing encroachment of...
Resource Type:: Technical Report
Full Text:: Share agreement between the Bureau of Land Management, Coast Range Area, Eugene, OR and Oregon State

Demography and Reproduction of Erigeron decumbens var. decumbens, 1993-1994 Field Studies

Creator:: Ingersoll, Cheryl A., Finley, Karen K., and Clark, Deborah Louise, 1950-
Abstract:: Erigeron decumbens var. decumbens, the Willamette Daisy, is endemic to the Willamette Valley of Oregon. This taxon is a Category 1 Candidate for listing under the federal Endangered Species Act (U.S. Fish and Wildlife Service 1990) and is listed as Endangered under Oregon state law. Herbarium records indicate that E....
Resource Type:: Technical Report
Full Text:: Willamette Valley of Oregon. This taxon is a Category 1 Candidate for listing under the federal Endangered

Restoration of native upland prairies: Habitat for Fender’s blue butterfly (Icaricia icarioides fenderi)

Creator:: Clark, Deborah Louise, 1950- and Wilson, Mark V.
Abstract:: Our project goal is to promote the abundance of the endangered Fender’s blue butterfly (Icaricia icarioides fenderi) by recreating upland prairie habitat in former agricultural land at Finley National Wildlife Refuge, Corvallis, Oregon. To achieve this goal we initiated the following three studies. Study One: Experimental Investigation on the Effectiveness...
Resource Type:: Technical Report
Full Text:: glaucus. The exceptions are: 1) One small area was retained in the west central portion of the field

Serpentine and non-serpentine edaphic ecology and the recovery of Lomatium cookii (Apiaceae), an endangered endemic of southwest Oregon

Creator:: Silvernail, Ian S.
Abstract:: The role of unusual geologies in plant distribution and form is well-known. Serpentine (ultramafic) soils exert a particularly strong influence on plants, as evidenced by a high level of endemism and the morphological and physiological traits displayed in adaptation to the extraordinary chemistry of these substrates. Adaptation may lead to...
Resource Type:: Masters Thesis
Full Text:: Area of Critical Environmental Concern (ACEC) and the Oregon Caves Highway at Laurel Road in the

Regeneration biology of Erigeron decumbens var. decumbens, an endangered plant of the Willamette Valley

Creator:: Clark, Deborah Louise, 1950-, Finley, Karen K., and Ingersoll, Cheryl A.
Abstract:: Erigeron decumbens var. decumbens, the Willamette daisy, is known only from the Willamette Valley of Oregon. Herbarium records, from the 1800's until 1934, indicate that the Willamette daisy was once common and widely distributed throughout the Willamette Valley (Clark et al. 1993). However, between 1934 and 1980, this taxon was...
Resource Type:: Technical Report
Full Text:: , is known only from the Willamette Valley of Oregon. Herbarium records, from the 1800's until 1934

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:: were not apparent in the February 2005 aerial survey (M. McWilliams, Oregon Department of Forestry

Phylogeny and Biogeography of Primula sect. Parryi (Primulaceae)

Creator:: Kelso, Sylvia, Beardsley, Paul M., and Weitemier, Kevin
Abstract:: Primula sect. Parryi comprises five species endemic to western North America: P. parryi, P. angustifolia, P. rusbyi, P. capillaris, and P. cusickiana with four varieties. This section, derived from a clade with representatives in Asia and Europe, exemplifies a phytogeographic pattern in which a widespread species is accompanied by multiple...
Resource Type:: Article
Full Text:: . 3 Current address: Department of Biology, Portland State University, P.O. Box 751, Portland, Oregon

Final Report for the project: Research on Habitat Manipulation and Management of Fender's Blue Butterfly Areas

Creator:: Wilson, Mark V. and Clark, Deborah Louise, 1950-
Abstract:: We report first-year results from two field experiments evaluating the effectiveness of various techniques for the control of pest plants in Fender's blue butterfly habitat. In the woody-plant study, we monitored the effects of mowing, mowing and herbicides, and burning on woody plants and key native and non-native grasses and...
Resource Type:: Technical Report
Full Text:: Valley of Oregon (Hammond and Wilson, 1993). The low abundance of this butterfly makes it a high priority

A ranunculalean liana stem from the cretaceous of British Columbia, Canada: Atli morinii gen. et sp nov.

Creator:: Smith, Selena Y., Little, Stefan A., Cooper, Ranessa L., Burnham, Robyn J., and Stockey, Ruth A.
Abstract:: Premise of research. The lianoid habit is found in 125 extant plant families and is most diverse and abundant in structurally complex forests, such as tropical forests. A stem with lianoid anatomy is described from Cretaceous sediments of Hornby Island, British Columbia. Methodology. The stem segment, 2.5 cm in diameter...
Resource Type:: Article
Full Text:: , Oregon State University, Corvallis, Oregon 97331, U.S.A. Premise of research. The lianoid habit is found

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:: Patterns in coastal marsh vegetation of the Juneau area

Danebo Wetland Prairie Project Environmental Education Curriculum

Creator:: Windham, George, Wagner, Jan, Ruzicka, Angela, Clark, Deborah Louise, 1950-, Wilson, Mark V., and Lederman, Norman
Abstract:: One goal of this environmental education curriculum is that students will gain an appreciation of Willamette Valley wetland prairies, a threatened ecosystem, and will gain an understanding of the importance of protecting these wetlands. A second goal is that students will see first-hand the processes involved in conducting scientific field...
Resource Type:: Other
Full Text:: Willamette River drainage area south of the falls near what is now Oregon City.) • Distribute articles and

Identification and mapping of habitat types in the vicinity of Mount Tolman in eastern Washington

Creator:: Wilson, Mary Loverna
Abstract:: Studies were conducted in the vicinity of Mount Tolman on the Colville Indian Reservation in eastern Washington in order to identify vegetation habitat types of the area. After field studies were completed, Daubenmire's keys to habitat types of eastern Washington (1968, 1970) were used to determine habitat types of the...
Resource Type:: Masters Thesis

Patterns in the occupancy and abundance of the globally rare lichen Erioderma pedicellatum in Denali National Park and Preserve, Alaska

Creator:: Stehn, Sarah E., Nelson, Peter R., Roland, Carl A., and Jones, Jennifer R.
Abstract:: We investigated habitat attributes related to the occupancy of the globally rare and endangered epiphytic lichen, Erioderma pedicellatum, in a newly discovered (2009) population center in Denali National Park and Preserve (DNPP), Alaska. We measured forest, tree and epiphytic lichen community characteristics on eighty-five systematically selected plots in four study...
Resource Type:: Article
Full Text:: south-central Alaska and by documenting the population size of E. pedicellatum in DNPP. STUDY AREA We

Native plant revegetation at Butterfly Meadows (Benton County), habitat for the endangered Fender's blue butterfly

Creator:: Clark, Deborah Louise, 1950-
Abstract:: Native prairies, which once dominated the landscape of the Willamette Valley, are considered among the rarest of Oregon's ecosystems and are in critical need of conservation. One of the largest remaining parcels of native upland prairie, Butterfly Meadows (Benton County), is being invaded by Brachypodium sylvaticum (false brome). This site...
Resource Type:: Technical Report
Full Text:: ), Habitat for the Endangered Fender's Blue Butterfly Report to the Native Plant Society of Oregon

Within-population genetic structure differs between two sympatric sister-species of ectomycorrhizal fungi, Rhizopogon vinicolor and R. vesiculosus

Creator:: Dunham, Susie M., Mujic, Alija Bajro, Spatafora, Joseph W., and Kretzer, Annette M.
Abstract:: Using spatial autocorrelation analysis, we examined the within-population genetic structure of Rhizopogon vinicolor and R. vesiculosus, two hypogeous ectomycorrhizal (EM) species that are sympatric sister taxa known to differ in their clonal structure. We collected 121 sporocarps and 482 tuberculate EM of both species from a 20 ha forest stand...
Resource Type:: Article
Full Text:: north slope of Mary’s Peak in the DUNHAM ET AL.: SPATIAL ANALYSIS OF RHIZOPOGON GENOTYPES 815 Oregon

Association of Spring Pruning Practices with Severity of Powdery Mildew and Downy Mildew on Hop

Creator:: Gent, David H., Nelson, Mark E., Grove, Gary G., Mahaffee, Walter F., Turechek, William W., and Woods, Joanna L.
Abstract:: Downy mildew (caused by Pseudoperonospora humuli) and powdery mildew (caused by Podosphaera macularis) are important diseases of hop in the Pacific Northwest United States, and cultural practices may affect the severity of both diseases. The association of spring pruning quality and timing with severity of downy mildew and powdery mildew...
Resource Type:: Article
Full Text:: in commercial yards in Oregon quantified the effect of delaying pruning timing 5 to 21 days

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:: and Coast Range of Oregon and Washington were studied to determine the source area of in-stream

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:: range of Pythium species obtained from the soils of three forest nurseries in Washington and Oregon

Effects of the Mycoparasite Sphaerellopsis filum on Overwintering Survival of Stem Rust in Perennial Ryegrass

Creator:: Gordon, T. C. and Pfender, W. F.
Abstract:: Sphaerellopsis filum is a mycoparasite of Puccinia graminis subsp. graminicola, a rust fungus that causes widespread crop damage on perennial ryegrass grown for seed. In observations taken over the winter months, S. filum was found naturally colonizing 2% of P. graminis subsp. graminicola uredinia on first-year plantings and 25% of...
Resource Type:: Article
Full Text:: rust pustules per 10 cm of row in the field experiment were plotted against time, and the area under

A Perithecial Sordariomycete (Ascomycota, Diaporthales) from the Lower Cretaceous of Vancouver Island, British Columbia, Canada

Creator:: Bronson, Allison W., Klymiuk, Ashley A., Stockey, Ruth A., and Tomescu, Alexandru M. F.
Abstract:: A perithecial ascomycete, Spataporthe taylori gen. et sp. nov., represented by >70 sporocarps is preserved by cellular permineralization in marine carbonate concretions dated at the Valanginian-Hauterivian boundary (Early Cretaceous) from Vancouver Island, British Columbia, Canada. The spheroid perithecia with lumina 330–470 µm wide and 220–320 µm high are densely distributed...
Resource Type:: Article
Full Text:: . Spatafora, Oregon State University, who pointed our searches for taxonomic affinities in the direction of

Senftenbergia oregonensis (Arnold) comb. nov. (Filicales): Delimiting Relationships Among Paleozoic Tedeleaceae

Creator:: Hillier, Kaitlin G. and Rothwell, Gar W.
Abstract:: Reexamination of fossilized plant material from the westernmost Pennsylvanian-age wetland flora in North America reveals that material of Pecopteris oregonensis Arnold represents a filicalean fern frond with annulate sporangia and anatomically preserved vascular tissues of the rachis. The frond, which is redescribed as Senftenbergia oregonensis (Arnold) Hillier et Rothwell comb....
Resource Type:: Article
Full Text:: Read and Merriam (1940) within the Spotted Ridge Formation of central Oregon (Merriam and Berthiaume

Illustration List for Macrolichens of the Pacific Northwest, 2nd edition (2009)

Creator:: McCune, Bruce and Geiser, Linda
Abstract:: References are given for illustrations in the second edition of Macrolichens of the Pacific Northwest. For each illustration, we list the photographer or illustrator, the specimen photographed, where the specimen was from, collector, collection number, and herbarium.
Resource Type:: Other
Full Text:: the Pacific Northwest, 2nd edition (2009) Bruce McCune and Linda Geiser, Oregon State University Press

Revegetation in the 1914-1915 devastated area of Lassen Volcanic National Park

Creator:: Bailey, Warren Hutchinson, 1914-
Abstract:: At the time of the eruptions of Lassen Peak in 1914-1915, an area of vegetation along the east slope of the mountain approximately 1 1/4 miles wide and four miles long was destroyed. Except for a few surviving trees, all vegetation was destroyed. A study of the revegetation of this...
Resource Type:: Dissertation
Full Text:: Revegetation in the 1914-1915 devastated area of Lassen

Species Changes in Macrolichens of the Pacific Northwest, 2nd edition (2009)

Creator:: McCune, Bruce and Geiser, Linda
Abstract:: We list additions, deletions, and other changes in species included in Macrolichens of the Pacific Northwest, 2nd edition, as compared to the 1st edition. The changes resulted from discoveries of range extensions into the Pacific Northwest, descriptions of new species, taxonomic revisions, and nomenclatural revisions.
Resource Type:: Other
Full Text:: Species Changes Œ 2nd edition, Macrolichens of the PNW 1

Benthic marine algae on Japanese tsunami marine debris – a morphological documentation of the species. Part 2 – The brown algae

Creator:: Hansen, Gayle I.
Abstract:: To determine the invasion threat to the NE Pacific of marine algae arriving on Japanese debris from the 2011 Great Tōhoku Earthquake and Tsunami, my colleagues and I identified the algal species on 42 of the most heavily fouled debris items that landed on the shores of Oregon and Washington...
Resource Type:: Presentation
Full Text:: study was provided by Oregon Sea Grant, the Ministry of the Environment of Japan through the North

Benthic marine algae on Japanese tsunami marine debris – a morphological documentation of the species. Part 3 - The green algae and cyanobacteria

Creator:: Hansen, Gayle I.
Abstract:: To determine the invasion threat to the NE Pacific of marine algae arriving on Japanese debris from the 2011 Great Tōhoku Earthquake and Tsunami, my colleagues and I identified the algal species on 42 of the most heavily fouled debris items that landed on the shores of Oregon and Washington...
Resource Type:: Presentation
Full Text:: : Financial support for studies on the algae of tsunami debris were provided by Oregon Sea Grant, the Ministry

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:: forests. Recently, Wiegand et al. [10] proposed the framework that expands the concept of species-area

Demographic analysis of Erigeron decumbens var. decumbens, an endangered plant species of the Willamette Valley, Oregon: 1999 Field Studies

Creator:: Clark, Deborah Louise, 1950-
Abstract:: Erigeron decumbens var. decumbens, known only from the Willamette Valley of western Oregon, is listed as Endangered by the U.S. Fish and Wildlife Service and by the state of Oregon. In 1993 a long-term population monitoring program for Erigeron decumbens var. decumbens was initiated at Baskett Slough National Wildlife Refuge...
Resource Type:: Technical Report
Full Text:: , Oregon). METHODS Study site The study area for the monitoring is located to the southeast of

Final report, year two: Control of Brachypodium sylvaticum and restoration of rare native upland prairie habitat at Butterfly Meadows, Benton County ODA 1514 GR

Creator:: Clark, Deborah Louise, 1950-, Blakeley-Smith, Matt, Hammond, Paul, Johnson, Deborah, Kaye, Tom, Kelpsas, Bruce, Pfund, Fred, Vomocil, Marc, and Wilson, Mark V.
Abstract:: Our project goal is to protect and restore rare Willamette Valley upland prairie habitat at Butterfly Meadows (Benton County) from invasion by the noxious weed Brachypodium sylvaticum (false brome). Native prairies, which once dominated the landscape of the Willamette Valley, are considered among the rarest of Oregon’s ecosystems and are...
Resource Type:: Technical Report
Full Text:: was established at each end of the treatment area. The remaining area was divided into ten 1 m

Final report [year one]: Control of Brachypodium sylvaticum and restoration of rare native upland prairie habitat at Butterfly Meadows, Benton County ODA 1342 GR

Creator:: Clark, Deborah Louise, 1950-, Hammond, Paul, Johnson, Deborah, Kaye, Tom, Kelpsas, Bruce, Pfund, Fred, Vomocil, Marc, and Wilson, Mark V.
Abstract:: Our project goal is to protect and restore rare Willamette Valley upland prairie habitat at Butterfly Meadows (Benton County) from invasion by the noxious weed Brachypodium sylvaticum (false brome). Native prairies, which once dominated the landscape of the Willamette Valley, are considered among the rarest of Oregon’s ecosystems and are...
Resource Type:: Technical Report
Full Text:: planned for the second phase of this project. Pilot Study A Methods Study area Pilot study A was

Parmelina yalungana resurrected and reported from Alaska, China and Russia

Creator:: Nelson, Peter R., Kepler, Ryan, Walton, James, Fankhauser, John, Nelson, Laura, and Song, Wang Li
Abstract:: Parmelina quercina is a well-studied foliose macro-lichen found on rocks and trees in the Northern Hemisphere. Recent studies support multiple species within P. quercina based on material from Europe, North America and western Asia. The identities of Parmelina quercina s.lat. reported from eastern Asia and Alaska remain unknown. We compared...
Resource Type:: Article
Full Text:: base of the Yentna River valley on the south side of the Alaska Range. This area has a strong

Identification of Phytophthora infestans US-8 lineage through genetic markers

Creator:: Fritz, Eric and Knaus, Brian
Resource Type:: Presentation
Full Text:: . 2002. Where is Phytophthora on the Tree of Life? Oomycetes are not 'true' fungi Eukaryotes

Brown rot of fruits and fruit trees in Oregon

Creator:: Posey, Gilbert Bradley
Resource Type:: Masters Thesis
Full Text:: reported where pomaceous fruits were attacked by the disease. In the state of Oregon during the past

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:: to Mr. Harold Weaver, Forester of the Bureau of Indian Affairs, Portland, Oregon, for his help in

Identifying genes that influence the ability of Rhodococcus to benefit plants

Creator:: Lederhos, Heidi
Abstract:: Symbioses are intimate interactions between two different organisms. In a pathogenic interaction, one organism benefits and the other is generally harmed; whereas in a mutualistic interaction, the members reciprocally benefit. Rhodococcus is a genus of Gram-positive bacteria that persist in a variety of terrestrial and aquatic ecosystems. Although better known...
Resource Type:: Poster
Full Text:: extensions that increase the surface area of roots, forming an extensive interface between plant and soil

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:: Epoch most of the present land area of western and central Oregon was covered by the sea (148, p. 10

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:: Area The study area included the western slopes of the Cascade Mountains in Oregon, and encompassed

The effects of ozone on the growth, rhizosphere population dynamics, and mycorrhizal colonization of wheat

Creator:: Kimball, Shannon M.
Resource Type:: Masters Thesis
Full Text:: . Kimball A THESIS submitted to Oregon State University in partial fulfillment of the requirements for

The influence of prescribed fire on the rare endemic plant Delphinium pavonaceum (Peacock larkspur)

Creator:: McKernan, Brie-Anne
Abstract:: In the wetland prairie of William L. Finley National Wildlife Refuge (FNWR) in western Oregon, we investigated the response of Delphinium pavonaceum Ewan (peacock larkspur, Ranunculaceae), an endangered perennial forb, to four unreplicated dormant season fire regimes of 0, 2, 4, or 10 fires that were applied over a 12-year...
Resource Type:: Masters Thesis
Full Text:: In the wetland prairie of William L. Finley National Wildlife Refuge (FNWR) in western Oregon, we

The influence of host nutrition on the development of xiphinema americanum

Creator:: Nigh, Edward L.
Resource Type:: Dissertation
Full Text:: Department of Botany and Plant Pathology, Oregon State University. To the late Dr. R. O. Belkengren, who

Description of the plant communities and succession of the Oregon coast grasslands

Creator:: Ripley, James Douglas
Abstract:: In an effort to describe the plant communities and succession of the Oregon coastal grasslands, vegetation and environmental data were collected from 75 stands at 24 separate locations ranging from Cape Falcon in Tillamook County to Cape Ferrelo in Curry County. The vegetation data consisted of cover and frequency values...
Resource Type:: Dissertation
Full Text:: DESCRIPTION OF THE STUDY AREA General The Oregon coast affords the visitor a remarkably diverse panorama of

Comparison of the water relations characteristics of woody plants in western Oregon

Creator:: Davis, Kent J.
Abstract:: I studied the water relations traits, twig conductivity, C'3 isotopic composition, and wood density of three conifer and five angiosperm species in western Oregon. This study took place from spring 2002 to fall 2003 on four sites. Species were selected to represent the diversity of drought tolerance of woody plants...
Resource Type:: Masters Thesis
Full Text:: of woody plants in western Oregon. The objectives of this work were to describe the seasonal

Propagule sources, disturbance characteristics and the inital establishment of riparian vegetation after debris flows

Creator:: Gecy, Jeanne Leslie
Abstract:: Debris flows are a major cause of disturbance to riparian vegetation. Both observational and experimental studies were used to examine the initial recovery of riparian vegetation after debris flows on headwater streams in the western Cascades of Oregon. My goal was to determine the roles of seedlings and vegetative sprouts,...
Resource Type:: Masters Thesis
Full Text:: town of Blue River, Oregon (Figure 2-1). The climate of the area is mild, characterized by wet

The use of flowering crab apples for the detection of latent viruses in apples

Creator:: Reynolds, James Edward
Abstract:: Recent investigations indicate that several latent viruses of apples exist in common commercial apple stocks, but these viruses and their relationships are incompletely understood. This thesis describes investigations of crab apples as indicators of latent viruses of apples. Eighty-eight varieties and species of crab apples were tested as indicators of...
Resource Type:: Dissertation
Full Text:: to OREGON STATE UNIVERSIT Y in partial fuLfillrnent of the requirernents for the degree of DOCTOR

Plant communities of the grassy balds of Marys Peak, Oregon

Creator:: Snow, Billy Douglas
Resource Type:: Masters Thesis
Full Text:: Peak. 3 PHYSICAL DESCRIPTION OF STUDY AREA Location The Coast Range of Oregon extends from the

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