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Filtering by: Subject Productivity Remove constraint Subject: Productivity Advisor Letelier, Ricardo M. Remove constraint Advisor: Letelier, Ricardo M.

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  • 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:
    , to a large extent, refuted by the increasing number of primary productivity measurements in these

  • 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:
    primary productivity and carbon (C) drawdown. Recent laboratory studies have shown that elevated pCO2

  • 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:
    ) in regulating productivity and nitrogen fixation rates of diazotrophs and to examine the method of