Michael L. Parsons Coastal Watershed Institute Florida Gulf Coast University.
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Transcript of Michael L. Parsons Coastal Watershed Institute Florida Gulf Coast University.
![Page 1: Michael L. Parsons Coastal Watershed Institute Florida Gulf Coast University.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649f0d5503460f94c208cb/html5/thumbnails/1.jpg)
PhytoplanktonMichael L. Parsons
Coastal Watershed InstituteFlorida Gulf Coast University
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Phytoplankton (microalgae)
Cyanobacteria (Microcystis)Diatom (Pseudo-nitzschia) Diatom (Actinoptychus)
Dinoflagellate (Karenia brevis)
Dinoflagellate (Gambierdiscus)
Chlorophyte
Silicoflagellate
Haptophyte
Diatom (Chaetoceros)
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OverviewThe Good: phytoplankton are the base of the
foodwebThe Bad: too much can have negative impactsThe Ugly: some phytoplankton can produce
toxins that can kill animals and make people sick
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Food Web
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Phytoplankton Growth RequirementsLightNutrients (nitrogen, phosphorus, carbon,
other compounds)Can serve as indicators of nutrient loading
and light availability
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The Good
nutrients plankton
phyto
pla
nkt
on
fish
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The Bad
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The Ugly
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Phytoplankton and the CaloosahatcheeMany factors that affect the growth of
phytoplankton in the Caloosahatchee are controlled/influenced by the flow of the river.
As flow increases:nutrients phytoplanktonresidence time phytoplanktonsalinity assemblage shift
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flow nutrients phytoplankton
Doering et al. 2006
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flow residence time phytoplankton
Wan et al. 2013
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Doering et al. 2006
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flow residence time phytoplankton
Wan et al. 2013
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flow salinity assemblage shift
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Andresen 2011
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Andresen 2011
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Brand, unpub.
Red Tides and Caloosahatchee Discharges
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Brown et al. 2006
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0 1000 2000 3000 4000 5000 6000 7000 8000 9000 100000
7
14
21
28
35Red tide frequency versus S79 N loading
mg N/cf/s
% o
f sam
ples
>10
0,00
Kar
enia
bre
vis
per l
iter
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“The combined flux of N and P from TB, CH, and the Caloosahatchee River could theoretically supply 11–50% of the N and 11–57% of the P required to support growth of the measured population abundance for each of the three blooms”
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Workshop QuestionsWhat driver is the indicator sensitive to?
Nutrients, salinity, light
What constitutes a healthy population of the indicator? Low/moderate cell concentrations; more diatoms and less
cyanobacteria and flagellates
Is the indicator a valued component of the Caloosahatchee system? Should be!
What metrics are appropriate for assessing this indicator? Chlorophyll concentrations; species identifications
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Workshop QuestionsWhat are the strengths and limitations of this indicator?
Chlorophyll is an easy (and strong) response variable to measure Cofounding factors (salinity and nutrients; flow and residence time)
What are the relevant gaps and uncertainties in our understanding of the relationship between drivers/stressor and indicator response? Teasing out nutrient loading versus residence time Role of Caloosahatchee in red tides
Could our use of this indicator be improved to address additional drivers/stressors? Yes – can help to optimize flow regimes in different conditions
Next steps? River and red tides Assemblage shifts versus flow