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  • Remineralization of marine particulate organic matter

    Creator:
    Burkhardt, Brian Gary
    Abstract:
    Marine microorganisms play a significant role in the cycling of nutrients in the open ocean through production, consumption, and degradation of organic matter (OM). Carbon (C), nitrogen (N), and phosphorus (P) are essential ingredients in every known recipe for life. However, the cycling of each of these elements proceeds at...
    Resource Type:
    Masters Thesis
    Full Text:
    : _____________________________________________________________________ Angelicque E. White Marine microorganisms play a significant role in the cycling of

  • Above and Below : Oregon Coastal Phytoplankton Bloom Dynamics from Sea and Space

    Creator:
    McKibben, S. Morgaine
    Abstract:
    Phytoplankton are a sentinel class of organisms in the marine environment. Through their photosynthetic activity in sunlit waters worldwide, phytoplankton shape the health and productivity of marine ecosystems and impact the global climate. In this work a range of ocean sensing technologies (via ships, surf zone sampling, moorings, gliders, and...
    Resource Type:
    Dissertation
    Full Text:
    ! CONTRIBUTION OF AUTHORS Angelicque E. White provided intellectual contributions and editing for all chapters

  • A proposed method to analyze meso- and microplastic pollution on beaches in Oregon

    Creator:
    Losh, Sage
    Abstract:
    Meso- and microplastic debris is becoming a rising coastal issue as more research highlighting the detrimental impacts this material has on marine organisms and the environment is performed. This research, however, continues to be conducted in a non-standardized manner meaning that the data being collected cannot be compared spatially or...
    Resource Type:
    Honors College Thesis
    Full Text:
    : ______________________________________________________ Dr.  Angelicque  White         Meso- and microplastic debris is becoming a

  • Development of satellite bloom detection products for coastal Oregon

    Creator:
    McKibben, S. Morgaine
    Abstract:
    Two bloom-detection products were developed for the Oregon coast that describe the relative percent change observed between successive pairs of 8-day chlorophyll-a (CHL) and fluorescence line-height (FLH) products obtained from the MODerate Resolution Imaging Spectroradiometer aboard the Aqua spacecraft (MODIS-Aqua). The CHL[subscript dev] and FLH[subscript dev] products, respectively, were optimized...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: _____________________________________________________________________ Angelicque E

  • Ecology and Environmental Controls of Two Keystone Groups of Oceanic Microorganisms : Diazotrophs and Pathogenic Vibrio

    Creator:
    Gradoville, Mary Rose
    Abstract:
    Marine bacteria play vital roles in every niche of the ocean, from small-scale symbioses to large-scale productivity and the regulation of Earth’s climate. Recent advances in molecular tools now allow us to probe the genetic potential of entire microbial communities. The next step is linking these diverse communities to the...
    Resource Type:
    Dissertation

  • Phosphorus physiology and environmental forcing of oceanic cyanobacteria, primarily Trichodesmium spp.

    Creator:
    White, Angelicque E.
    Abstract:
    The biological transformation of dinitrogen gas (N2) into combined forms(termed N2 fixation) by certain genera of oceanic cyanobacteria represents the largest incoming flux of nitrogen to the global ocean. As such, biological nitrogen fixation plays a significant role in the regulation of oceanic productivity and the export of carbon and...
    Resource Type:
    Dissertation
    Full Text:
    OF THE DISSERTATION OF Angelicque E. White for the degree of Doctor of Philosophy in Oceanography

  • Photosynthetic Energy Allocation Strategies of Thalassiosira pseudonana During Light Limited Growth

    Creator:
    Fisher, Nerissa L.
    Abstract:
    Photosynthetic energy allocation strategies were investigated in the marine diatom, Thalassiosira pseudonana, grown under a wide range of light limitation. Steady-state, continuous cultures were established at three light-limited growth rates. Simultaneous measurements of photosynthetic activity were made that targeted different points in photosynthetic energy flow from gross to net photosynthesis....
    Resource Type:
    Masters Thesis

  • Phosphorus control of nitrogen fixation

    Creator:
    Watkins-Brandt, Katie S.
    Abstract:
    Under conditions of fixed N-limitation, as with most oligotrophic systems, the process of biological N₂ fixation (diazotrophy) is favored, provided the necessary trace elements and vitamins are sufficient. Despite the well understood contributions of N₂ fixation in oligotrophic regions, the nutritional and ecological controls of marine diazotrophs have not been...
    Resource Type:
    Masters Thesis
    Full Text:
    : Angelicque E. White Ricardo M. Letelier Yvette H. Spitz Under conditions of fixed N

  • A study on the effects of enhanced pCO2 on open ocean diazotrophic assemblages

    Creator:
    Gradoville, Mary Rose
    Abstract:
    Biological di-nitrogen (N₂) fixation is a key process in open-ocean ecosystems, where the new nitrogen (N) provided by marine diazotrophs can support a large fraction of primary productivity and carbon (C) drawdown. Recent laboratory studies have shown that elevated pCO₂ enhances the rate of N₂ fixation by select laboratory isolates...
    Resource Type:
    Masters Thesis
    Full Text:
    my face. My committee member, Angelicque White, for her help, humor, and honesty. She has

  • Hydrogen isotopic composition of C₃₇ alkenones and the ecology and physiology of coccolithophores

    Creator:
    Wolhowe, Matthew D.
    Abstract:
    A three-part study was conducted into the impact of physiological and ecological variables on the net isotopic fractionation of hydrogen, α[subscript K₃₇], expressed in C₃₇ alkenones. First, alkenone-producer production, abundance, and export were characterized in the summertime Gulf of California and Eastern Tropical North Pacific using compound-specific, labeled in situ...
    Resource Type:
    Dissertation
    Full Text:
    Growth and Export in a Stratified Sea”, Dr. Angelicque E. White, Dr. Brian N. Popp, and Anaid Rosas