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  • Physiological impacts of groundwater and surface water application on desert graminoids of different geographic origin

    Creator:
    Abdallah, Mohamed (Mohamed Ahmed B.)
    Abstract:
    Desert plant communities are among the most sensitive to changes in soil water conditions. In areas with shallow aquifers, it is important to understand both the effects of groundwater alterations on vegetation and how changes in surface-soil water affect plant water uptake. Studies in arid environments have evaluated the effect...
    Resource Type:
    Masters Thesis
    Full Text:
    : Ricardo Mata-Gonzalez Desert plant communities are among the most sensitive to changes in soil water

  • 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:
    : _____________________________________________________________________ Ricardo M. Letelier Biological di-nitrogen (N2) fixation is a key process in open-ocean

  • Marine Nitrogen Subsidies to Terrestrial Systems: Transport Through Wrack Deposition

    Creator:
    Traylor, Andrew
    Abstract:
    Fluctuations in one system affect adjacent systems; mechanistic understanding of linkages helps conservation efforts be more effective by focusing on influential species and areas that facilitate connections between ecosystems. This study explored marine-derived nutrient inputs to adjacent terrestrial communities. We quantified wrack (seaweed and other organic matter) deposition at sites...
    Resource Type:
    Honors College Thesis
    Full Text:
    : _______________________________________________________________ Ricardo Letelier Abstract body

  • 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:
    : _____________________________________________________________________ Ricardo M. Letelier Yvette H. Spitz The biological

  • Seconds to hour scale photosynthetic responses in marine microalgae

    Creator:
    Laney, Samuel R.
    Abstract:
    Our view of phytoplankton has historically revolved around their inability to control their location in space. The term phytoplankton itself underscores this particular difference between phytoplankton and their sessile terrestrial counterparts. Yet there are other differences between land plants and the phytoplankton that are perhaps equally important, beyond this sessile-planktonic...
    Resource Type:
    Dissertation
    Full Text:
    Abstract approved: _____________________________________________________________________ Ricardo M

  • Primary production dynamics in the North Pacific subtropical gyre

    Creator:
    Corno, Guido
    Abstract:
    The North Pacific subtropical gyre (NPSG), once considered to be a biological desert due to low primary production (PP) and its associated variability, has been found more productive and variable than previously thought. The environmental conditions controlling this relatively high PP variability are yet to be elucidated, despite important implications...
    Resource Type:
    Dissertation
    Full Text:
    : _____________________________________________________________________ Mark R. Abbott, Ricardo M. Letelier The North Pacific subtropical gyre (NPSG), once

  • 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