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Spatial and Temporal Dynamics of Phytoplankton Distribution in a River-Dominated Estuary, Apalachicola Bay, Florida

Title: Spatial and Temporal Dynamics of Phytoplankton Distribution in a River-Dominated Estuary, Apalachicola Bay, Florida.
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Inaccessible until May 8, 2020 due to copyright restrictions.

Name(s): Geyer, Natalie L. (Natalie Louise), author
Huettel, Markus, professor directing dissertation
Miller, Thomas E. (Professor of Biological Science), university representative
Wetz, Michael S., committee member
Speer, Kevin G. (Kevin George), committee member
Landing, William M., committee member
Florida State University, degree granting institution
College of Arts and Sciences, degree granting college
Department of Earth, Ocean, and Atmospheric Science, degree granting department
Type of Resource: text
Genre: Text
Doctoral Thesis
Issuance: monographic
Date Issued: 2017
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource (123 pages)
Language(s): English
Abstract/Description: In the shallow, bar-built estuary Apalachicola Bay, the discharge of the Apalachicola River, the largest river in Florida by discharge volume, produces short residence times of water in the Bay and pronounced gradients in salinity and nutrients. This, in combination with wind- and tidal-driven circulation, generates an environment for plankton that is complex and highly dynamic. Understanding these dynamics and the factors controlling them is prerequisite for estimating phytoplankton biomass and productivity in such ecosystems. This research assessed the variability of estuarine phytoplankton in Apalachicola Bay at multiple temporal and spatial scales, utilizing high resolution spatial sampling, dye release experiments monitored with a drone, and a long-term record of water quality. Small-scale chlorophyll a (Chl a) peaks (1.3 ± 0.7 km wide) had steep gradients (3.0 ± 6.0 µg Chl a L-1 km-1) and accounted for 7.7 ± 2.7 % of the biomass observed with a flow-through water quality instrument. Winds, tides, and temperature affected Chl a peak characteristics, while the river plume front was a dynamic location of elevated Chl a. Horizontal dispersion of small-scale inert tracer patches (10-100 m) were faster than phytoplankton reproduction cycles, suggesting that small-scale phytoplankton patches may not be able to outpace physical dispersion in estuaries through growth. The evaluation of a 14-year time series of bay water quality data revealed that extreme river discharge events influenced intra- and interannual variability of Chl a. The nutrient buffering capacity of Apalachicola Bay, in conjunction with longer residence time, increased light penetration, and reduced grazing pressure, may mitigate the reduction of riverine nutrient input during drought. In contrast, tropical storms and high river discharge events may lead to periods of reduced phytoplankton biomass by increasing flushing rates of the estuary and reducing light availability. These new insights into the spatial and temporal variability of phytoplankton distribution and what’s controlling it helps coastal managers to understand how river discharge, winds, and tides affect biomass in bar-built estuaries.
Identifier: FSU_SUMMER2017_Geyer_fsu_0071E_13866 (IID)
Submitted Note: A Dissertation submitted to the Department of Earth, Ocean and Atmospheric Science in partial fulfillment of the Doctor of Philosophy.
Degree Awarded: Spring Semester 2017.
Date of Defense: April 13, 2017.
Keywords: Drought, Estuaries, Phytoplankton, Rhodamine WT, River, Spatial variability
Bibliography Note: Includes bibliographical references.
Advisory Committee: Markus Huettel, Professor Directing Dissertation; Thomas Miller, University Representative; Michael Wetz, Committee Member; Kevin Speer, Committee Member; William Landing, Committee Member.
Subject(s): Marine biology
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_SUMMER2017_Geyer_fsu_0071E_13866
Owner Institution: FSU

Choose the citation style.
Geyer, N. L. (N. L. ). (2017). Spatial and Temporal Dynamics of Phytoplankton Distribution in a River-Dominated Estuary, Apalachicola Bay, Florida. Retrieved from http://purl.flvc.org/fsu/fd/FSU_SUMMER2017_Geyer_fsu_0071E_13866