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Filtering by: Creator Colwell, Frederick Remove constraint Creator: Colwell, Frederick Resource Type Dissertation Remove constraint Resource Type: Dissertation

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  • Characterizing drivers of microbial community structure and function in diverse marine sediments

    Creator:
    Graw, Michael F.
    Abstract:
    Marine sediments are one of the largest habitats for microbial life on earth. These microorganisms play critical roles in biogeochemical cycling both within the subsurface and between the sediment and water columns. However, microbial communities in sediments are highly heterogeneous and the factors defining microbial community structure and metabolic function...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ Frederick S. Colwell Marine sediments are one of the largest habitats for microbial

  • Geomicrobiology of marine sediment containing methane

    Creator:
    Briggs, Brandon R.
    Abstract:
    Marine sediments contain an abundance of methane that is biologically produced and plays a significant role in the global carbon cycle. Microbes responsible for the carbon cycle in marine sediments, and the processes that they carry out, need to be characterized in order to fully understand the role of this...
    Resource Type:
    Dissertation
    Full Text:
    approved: Frederick S. Colwell Marine sediments contain an abundance of methane that is

  • Establishment and dynamics of methane-oxidizing microbial communities in marine sediments

    Creator:
    Klasek, Scott A.
    Abstract:
    Marine sediments are vast sources and reservoirs of methane, a potent greenhouse gas. Most of this methane is anaerobically oxidized by archaea before it can reach the overlying ocean, though the efficiency of this process often depends on methane fluxes and mechanisms of fluid transport. Anaerobic methanotrophic archaea, or ANME,...
    Resource Type:
    Dissertation
    Full Text:
    : ____________________________________________________________ Frederick S. Colwell Abstract Marine sediments are vast sources and reservoirs of methane

  • Biogeochemical Processing of Freshwater Carbon in the Anthropocene

    Creator:
    Buser, Jessica Z.
    Abstract:
    Freshwater systems cycle carbon along a spatial and temporal biogeochemical continuum, across which ecosystem processes contribute to transformations of organic matter (OM). Various ecological constraints impact rates OM transformation and production and consumption of the energetic end of respiration, methane. Microbiological processing and complete reduction of carbon substrates to methane...
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    Dissertation
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    Anthropocene Abstract approved: ______________________________________________________ Frederick S

  • Impact of Igneous Mineralogy on the Composition and Metabolic Function of Microbial Biofilms in a Thermal Suboceanic Crustal Aquifer

    Creator:
    Smith, Amy R.
    Abstract:
    Igneous oceanic crust encompasses ~60% of Earth’s surface and is composed of basalt glass and mafic, ultramafic, and felsic minerals. A vast marine aquifer lies within the crust, exchanging geochemically altered fluids with seawater from the overlying ocean at ridge crests, flanks, seamounts, and outcrops where permeable crust is exposed....
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    Dissertation
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    . Abstract approved: _____________________________________________________ Frederick S. Colwell Martin R

  • Influence of a Sedimentary Source of Nd on Deep Ocean εNd Distributions

    Creator:
    Abbott, April N.
    Abstract:
    Ocean circulation is an important component in Earth's climate system. Predicting future climate and circulation changes requires an improved understanding of the past relationship between climate and ocean currents. The neodymium isotope composition (εNd) of water masses is frequently used as a quasi-conservative tracer to reconstruct ocean circulation. The current...
    Resource Type:
    Dissertation

  • Examining parameters of vectorial capacity for mosquitoes associated with stormwater catch basins in Corvallis, Oregon

    Creator:
    Townzen, Jill S.
    Abstract:
    This research examines two of parameters of vectorial capacity for mosquitoes associated with catch basins in Corvallis, Oregon. The parameters of interest were determining 1) abundance of the mosquito species associated with the catch basins and 2) feeding patterns of local mosquito species. Three species of mosquitoes were collected from...
    Resource Type:
    Dissertation
    Full Text:
    Anderson, for their support and guidance. I would also like to thank Rick Colwell for agreeing to step

  • Automated web-based analysis and visualization of spatiotemporal data

    Creator:
    Keon, Dylan B.
    Abstract:
    Most data are associated with a place, and many are also associated with a moment in time, a time interval, or another linked temporal component. Spatiotemporal data (i.e., data with elements of both space and time) can be used to assess movement or change over time in a particular location,...
    Resource Type:
    Dissertation

  • Remote Sensing of Nearshore Hydrodynamic and Morphodynamic Processes

    Creator:
    O'Dea, Annika M.
    Abstract:
    The use of remote sensing techniques in coastal science and engineering has rapidly increased in the past few decades. This dissertation outlines new remote sensing tools using two remote sensing technologies (lidar and X-band marine radar) along with two nearshore hydrodynamic and morphodynamic analyses supported or motivated by these remote...
    Resource Type:
    Dissertation
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    acknowledge and thank my remaining committee members, Dan Cox, Chris Parrish, Greg Wilson, and Rick Colwell

  • Microbial diversity, metabolic potential, and transcriptional activity along the inner continental shelf of the Northeast Pacific Ocean

    Creator:
    Bertagnolli, Anthony D.
    Abstract:
    Continental shelves located along eastern boundary currents occupy relatively small volumes of the world’s oceans, yet are responsible for a large proportion of global primary production. The Oregon coast is among these ecosystems. Recent analyses of dissolved oxygen at shallow depths in the water column has suggested increasing episodes of...
    Resource Type:
    Dissertation
    Full Text:
    . Giovannoni, Dr. Peter J. Bottomley, Dr. Frederick Cowell, Dr. Allen Milligan and Dr. Kaichang Li Past and