Environmental Influences on Bacterio-phytoplanktonic Coupling and Bacterial Growth Efficiency in a Sub-tropical Estuary
Master of Science (MS)
First Advisor's Name
Dr. Joseph N. Boyer
First Advisor's Committee Title
Second Advisor's Name
Dr. Leonard J. Scinto
Second Advisor's Committee Title
Florida Bay, coupling, primary productivity, bacterial productivity, bacterial growth efficiency
Date of Defense
Bacterio-phytoplanktonic coupling and bacterial growth efficiency (BGE) measurements were used to analyze microbial trophic dynamics and the influence of environmental factors in Florida Bay, Florida. Phytoplankton gross primary productivity (GPP) was measured using 24-hour in situ oxygen incubations; bacterial productivity (BP) was measured using 3H- thymidine incorporation. Weak bacterio-phytoplanktonic coupling was observed over the sampling period. BP was more influenced by local total nitrogen concentrations while GPP was more evenly distributed. BGE rates were low but consistent with marine and estuarine ecosystems worldwide. Results suggest that bacterioplankton growth in Florida Bay is relatively uncoupled from phytoplankton production, which may be due in part to the low levels of phytoplankton biomass in the water column, the large amount of seagrass-derived DOM production in this shallow lagoon, the loading of nitrogen and organic matter associated with terrestrial runoff, and/or their combination.
Kotkowski, Rachel, "Environmental Influences on Bacterio-phytoplanktonic Coupling and Bacterial Growth Efficiency in a Sub-tropical Estuary" (2014). FIU Electronic Theses and Dissertations. 1155.
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