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    Microbial size spectra from diverse marine ecosystems

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    Gin_thesis.pdf (66.07Mb)
    Date
    1996-06
    Author
    Gin, Karina Y. H.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5664
    Location
    Massachusetts Bay
    Cape Cod Bay
    Sargasso Sea
    Equatorial Pacific
    DOI
    10.1575/1912/5664
    Keyword
     Marine phytoplankton; Marine plankton; Marine bacteria 
    Abstract
    Characteristics of microbial size spectra (bacteria and phytoplankton) were examined in relation to changes in ecosystem productivity and environmental perturbations. Samples were obtained from productive coastal waters in Massachusetts and Cape Cod Bays, oligotrophic waters in the Sargasso Sea and high nutrient, low chlorophyll waters in the equatorial Pacific. In general, a relative predominance of larger bacteria and phytoplankton cells was observed in early spring, where low temperatures resulted in wellmixed waters and high nutrient concentrations. Seasonal succession was accompanied by a shift in the size spectrum to smaller cells, coinciding with rising temperatures, stratification of the water column and diminishing nutrient concentrations. In stratified waters, larger mean bacteria and phytoplankton sizes were observed in surface and deep waters, whereas smaller sizes were observed around the chlorophyll maximum. Bacteria and phytoplankton growth were well correlated with mean bacteria sizes varying positively with mean phytoplankton sizes. Data pooled from all locations showed that the size spectral characteristics most sensitive to environmental change were the mean cell size, bacteria intercept and phytoplankton slope of the normalized concentration size spectrum. Increases in ecosystem productivity, chlorophyll, particulates and nutrients were generally accompanied by shifts in the size spectra to larger bacteria and phytoplankton.
    Description
    Submitted in partial fulfillment of the requirements for the degree of Doctor of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 1996
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    • Applied Ocean Physics and Engineering (AOP&E)
    • WHOI Theses
    Suggested Citation
    Thesis: Gin, Karina Y. H., "Microbial size spectra from diverse marine ecosystems", 1996-06, DOI:10.1575/1912/5664, https://hdl.handle.net/1912/5664
     

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