Microbial size spectra from diverse marine ecosystems
Gin, Karina Y. H.
MetadataShow full item record
Cape Cod Bay
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.
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
Showing items related by title, author, creator and subject.
Marine sedimentary organic matter : delineation of marine and terrestrial sources through radiocarbon dating; and the role of organic sulfur in early petroleum generation Benitez-Nelson, Bryan C. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1996-05)This thesis details two years of research conducted with the guidance and support of three advisors: Dr. J. K. Whelan, Dr. J. S. Seewald and Dr. T. I. Eglinton. Each of the three chapters represents a different, ...
Dynamic energy budgets and bioaccumulation : a model for marine mammals and marine mammal populations Klanjscek, Tin (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-06)Energy intake of individuals affects growth of organisms and, therefore, populations. Persistent lipophilic toxicants acquired with the energy can bioaccumulate and harm individuals. Marine mammals are particularly ...
Marine biological diversity : report of a meeting of the Marine Biological Diversity Working Group Eiswerth, Mark E. (Woods Hole Oceanographic Institution, 1990-03)On August 3 - 4, 1989, the Marine Policy Center of Woods Hole Oceanographic Institution hosted the initial meeting of the Marine Biological Diversity Working Group. The formation of this working group was fostered as part ...