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Filtering by: Advisor Barber, David A. Remove constraint Advisor: Barber, David A. Decade 2000-2009 Remove constraint Decade: 2000-2009

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  • Emergency fire rehabilitation of BLM lands in the Great Basin : revegetation & monitoring

    Creator:
    McArthur, Ted O.
    Abstract:
    The Bureau of Land Managements (BLM) Emergency Fire Rehabilitation (EFR) policy was developed in 1985 to encourage protection of sites from soil erosion and to minimize potential changes in vegetation communities that may result from the dominance of weedy species. To achieve the goals of EFR policy, managers often used...
    Resource Type:
    Masters Thesis
    Full Text:
    Rehabilitation of BLM Lands in the Great Basin: Revegetation & Monitoring. Abstract approved: David A. The

  • Diversity and community structure of aquatic insects in isolated montane desert streams

    Creator:
    Bogan, Michael T.
    Abstract:
    Local aquatic insect diversity and community structure is the result of multiple local and regional factors, and observed patterns depend upon the spatial and temporal scale under examination. Isolated stream systems in arid regions represent a new challenge in understanding the drivers of diversity and community structure, as most studies...
    Resource Type:
    Masters Thesis
    Full Text:
    Privacy ACKNOWLEDGEMENTS First and foremost I'd like to thank my advisor, Dr. David A. Lytle. Lytle

  • The influences of habitat structure and landscape heterogeneity on African buffalo (Syncerus caffer) group size in Hluhluwe-Imfolozi Game Reserve, South Africa

    Creator:
    Dora, Cathleen Anna
    Abstract:
    This study aimed to connect habitat and landscape scale variation, through time and space, to wildlife population dynamics. I studied African buffalo (Syncerus caffer) group size according to habitat structure, landscape heterogeneity, forage quality, and water availability in Hluhluwe-iMfolozi Game Reserve, South Africa. I used two approaches to study grouping...
    Resource Type:
    Masters Thesis

  • Aquatic insect adaptations to different flow regimes

    Creator:
    Yamamuro, Asako Melody
    Abstract:
    My thesis explored the effects of environmental variability on population dynamics and community composition of aquatic insects. Environmental variability in the form of flow regime in streams can limit the distribution and life-history traits of aquatic insects. I used tributaries to the McKenzie River in Oregon with dramatically different flow...
    Resource Type:
    Dissertation
    Full Text:
    : David A. Lytle My thesis explored the effects of environmental variability on population dynamics

  • Turning Points of Democracy

    Creator:
    Lindsley, Brian
    Abstract:
    In The Future of Freedom, Fareed Zakaria argues that there has emerged "too much democracy" and too little liberty in the world today, and suggests this trend may lead to a crisis of belief in democracy. However, what Zakaria calls "democratization" in many cases does not lead to democracy. The...
    Resource Type:
    Masters Thesis

  • The ecological legacy of Indian burning practices in southwestern Oregon

    Creator:
    Carloni, Kenneth R.
    Abstract:
    Two research questions are posed: (1) How have ecosystem conditions changed through time in southwestern Oregon? (2) How have culture-driven and climate-driven processes contributed to ecosystem change in southwestern Oregon? A brief introduction to the Little River study area is followed by a cultural and ecological history of the watershed....
    Resource Type:
    Dissertation
    Full Text:
    David A. Perry Two research questions are posed: (1) How have ecosystem conditions changed

  • Time-based nitrogen availability and risk of Taeniatherum caput-medusae (L.) Nevski invasion in central Oregon

    Creator:
    Stubbs, Michelle M.
    Abstract:
    During the last century, fire suppression, grazing, and climate change have caused sagebrush grasslands to be altered in both function and form; juniper and sagebrush dominate the landscape at the expense of herbaceous plants. Management efforts to reduce juniper and sagebrush overstory in order to enhance herbaceous components of the...
    Resource Type:
    Masters Thesis
    Full Text:
    : /1 /} Signature redacted for privacy. David A Pyke-(/~--~---- During the last century, fire

  • Yield responses of invasive grasses to carbon doses

    Creator:
    Brunson, Jessi L.
    Abstract:
    The sagebrush steppe ecosystem of the northern Great Basin is severely degraded and continues to decline due in large part to the invasive, non-native annual grasses Bromus tectorum L. (cheatgrass) and Taeniatherum caput-medusae (L.) Nevski (medusahead). Restoration of invasive-dominated areas is difficult, but can be enhanced by adding a carbon...
    Resource Type:
    Masters Thesis
    Full Text:
    : David A. Pyke Patricia S. Muir The sagebrush steppe ecosystem of the northern Great Basin is

  • Phenotypic evolution as a response to thermal ecology in the ferocious waterbug Abedus herberti (Hemiptera: Belostomatidae)

    Creator:
    Pelegrin, Arthur Lomis
    Abstract:
    Over 150 years ago, C. Bergmann observed a within-species pattern of increasing body size as elevation and latitude increased. Bergmann’s data came from numerous endothermic taxa, but the pattern has since been documented among numerous poikilotherms and invertebrates. The ferocious waterbug Abedus herberti Hidalgo (Hemiptera: Belostomatidae) lives in isolated populations...
    Resource Type:
    Masters Thesis
    Full Text:
    : ____________________________________________ David A. Lytle Over 150 years ago, C. Bergmann observed a within-species pattern of

  • Climate-growth relationships of western juniper and ponderosa pine at the pine-woodland ecotone in southern Oregon

    Creator:
    Knutson, Kevin C.
    Abstract:
    Pinyon-juniper woodlands throughout the western U.S. have expanded rapidly following European settlement during the late 19th century. In central and eastern Oregon, western juniper (Juniperus occidentalis var. occidentalis Hook.) encroachment has been previously documented in the sagebrush steppe and upper elevation aspen communities. While these vegetation changes and dynamics have...
    Resource Type:
    Masters Thesis
    Full Text:
    :________________________________________________________ David A. Pyke Pinyon-juniper woodlands throughout the western U.S. have expanded rapidly