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Filtering by: Conference name American Academy of Underwater Science Annual Symposium Remove constraint Conference name: American Academy of Underwater Science Annual Symposium Academic Affiliation Botany and Plant Pathology Remove constraint Academic Affiliation: Botany and Plant Pathology Degree Level Doctoral Remove constraint Degree Level: Doctoral

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  • Biological Soil Crusts of the Great Basin : An Examination of their Distribution, Recovery from Disturbance and Restoration

    Creator:
    Condon, Lea A.
    Abstract:
    We are at risk of losing the sagebrush steppe in the floristic Great Basin to the invasion of Bromus tectorum L., cheatgrass. The floristic Great Basin includes the Central Basin and Range, the Northern Basin and Range, and the Snake River Plain. The Great Basin receives most of its precipitation...
    Resource Type:
    Dissertation
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    communities and the conversion of the region into monocultures of non-native annual grasses (Pickford 1932

  • 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:
    Microsoft Word - diss 6.13.2011 AN ABSTRACT OF THE

  • Phylogeny, cospeciation, and host switching in the evolution of the ascomycete genus Rhabdocline on Pseudotsuga and Larix (Pinaceae)

    Creator:
    Gernandt, David S.
    Abstract:
    The relative role of cospeciation and host switching in the phylogenetic history of ascomycete foliar symbionts is addressed in the orders Leotiales and Rhytismatales, fungi associated predominantly with Pinaceae (Coniferales). Emphasis is placed on comparing the evolution of the sister genera Pseudotsuga and Larix (Pinaceae) with that of the pathogenic...
    Resource Type:
    Dissertation
    Full Text:
    . weirii on both North American species of Pseudotsuga is also probably the result of a recent host

  • Mulching to Manage Mummy Berry of Blueberry

    Creator:
    Florence, Jade
    Abstract:
    Monilinia vaccinii-corymbosi pseudosclerotia overwinter on the soil surface and produce apothecia in early spring, providing primary inoculum for Mummy Berry Disease of blueberry. Burial under 2.5 cm of soil or the absence of light have previously been identified as critical factors preventing the development of apothecia. Mulches were applied to...
    Resource Type:
    Dissertation
    Full Text:
    . 1936. North American species of Monilinia. I. Occurrence, grouping, and life- histories. Am J Bot 23

  • Seed and seedling ecology of Artemisia tridentata in a restoration context

    Creator:
    Wijayratne, Upekala C.
    Abstract:
    The semi-arid sagebrush steppe ecosystem is one of the largest biomes in North America. The steppe provides critical habitat and forage for wildlife and is economically important to recreation and livestock industries. However, the ecosystem is threatened primarily due to several negative effects associated with expansion of the exotic annual...
    Resource Type:
    Dissertation
    Full Text:
    threatened primarily due to several negative effects associated with expansion of the exotic annual grass

  • Contributions to the plant ecology of the Oregon coastal sand dunes

    Creator:
    Wiedemann, Alfred M.
    Abstract:
    Sand dunes are found along the coasts of most of the large land masses of the world. Because of their proximity to man and his activities, the maritime sand dunes of Europe, particularly Germany, France, Holland and Scandinavia, have the longest history of stabilization activities and botanical investigation. There are...
    Resource Type:
    Dissertation
    Full Text:
    lesser extent, in North America. Of the North American coastal dunes, those of the east coast have

  • Ecology of benthic microalgae of estuarine intertidal sediments

    Creator:
    Riznyk, Raymond Zenon
    Abstract:
    The benthic microalgae of sediments of the two tidal flats in Yaquina Bay, Oregon were investigated to determine the environmental factors limiting the abundance and the horizontal and vertical distribution of these organisms. The Southbeach tidal flat which is under the marine realm of deposition consists of fine to medium...
    Resource Type:
    Dissertation
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    Science Center. Because of the possible threat to the future of the Marine Center, the University of

  • Growth of Aphanizomenon flos-aquae in defined media

    Creator:
    O'Flaherty, Larrance Michael Arthur, 1941-
    Abstract:
    A strain of Aphanizomenon flos-aquae Born. et Flah. has been introduced into culture and maintained since August of 1964 in completely defined media. It exhibits the planktonic, colonial flake form found in nature, and both heterocysts and akinetes are present. The color and size of the flake and general appearance...
    Resource Type:
    Dissertation
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    . Aphanizomenon was found to be the most common producer of blooms. A symposium entitled Environmental

  • Unearthing the Cretaceous Diversification of Cornales

    Creator:
    Atkinson, Brian A.
    Abstract:
    The order Cornales (dogwoods) is the earliest diverging lineage within the most diverse group of flowering plants, the asterids (>80,000 species). Although molecular phylogenetics have significantly improved our understanding of cornalean systematics, early phylogenetic relationships remain uncertain due to an initial rapid radiation. The fossil record of Cornales is extensive...
    Resource Type:
    Dissertation
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    “abominable mystery”: Why are there so many angiosperm species? American Journal of Botany 96: 366–381

  • Interrelationship of wheat cultivar mixtures, stripe rust and yield

    Creator:
    Akanda, Shamsul I.
    Resource Type:
    Dissertation
    Full Text:
    has obvious and significant advantages (National Academy of Sciences, 1972; Marshall, 1977). For