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dc.contributor.authorGin, Karina Y. H.  Concept link
dc.coverage.spatialMassachusetts Bay
dc.coverage.spatialCape Cod Bay
dc.coverage.spatialSargasso Sea
dc.coverage.spatialEquatorial Pacific
dc.date.accessioned2012-12-28T15:24:52Z
dc.date.available2012-12-28T15:24:52Z
dc.date.issued1996-06
dc.identifier.urihttps://hdl.handle.net/1912/5664
dc.descriptionSubmitted 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 1996en_US
dc.description.abstractCharacteristics 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.en_US
dc.description.sponsorshipThe work was partially funded by the National Science Foundation (JGOFS) OCE- 9022285, OCE-9302529, OCE-9012117; NOAA Sea Grant (MIT); the Massachusetts Water Authority contract #S179; and fellowship funding from the National University of Singapore Overseas Scholarship.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherMassachusetts Institute of Technology and Woods Hole Oceanographic Institutionen_US
dc.relation.ispartofseriesWHOI Thesesen_US
dc.subjectMarine phytoplanktonen_US
dc.subjectMarine planktonen_US
dc.subjectMarine bacteriaen_US
dc.titleMicrobial size spectra from diverse marine ecosystemsen_US
dc.typeThesisen_US
dc.identifier.doi10.1575/1912/5664


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