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A three-dimensional biophysical model of Karenia brevis dynamics on the west Florida shelf: A look at physical transport and potential zooplankton grazing controls

A three-dimensional biophysical model of Karenia brevis dynamics on the west Florida shelf: A look at physical transport and potential zooplankton gra

A three-dimensional biophysical model of Karenia brevis dynamics on the west Florida shelf: A look at physical transport and potential zooplankton grazing controls   (Citations: 5)
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The development of accurate predictive models of toxic dinoflagellate blooms is of great ecological importance, particularly in regions that are most susceptible to their detrimental effects. This is especially true along the west Florida shelf (WFS) and coast, where episodic bloom events of the toxic dinoflagellate Karenia brevis often wreak havoc on the valuable commercial fisheries and tourism industries of west Florida. In an effort to explain the dynamics at work within the maintenance and termination phases of a red tide, a simple three-dimensional coupled biophysical model was used in the analysis of the October 1999 red tide offshore Sarasota, Florida. Results of the numerical experiments indicate that: (1) measured and modeled flowfields were capable of transporting the observed offshore inoculum of K. brevis to within 16km of the coastal boundary; (2) background concentrations (1000cellsL−1) of K. brevis could grow to a red tide of over 2×106cellsL−1 in little more than a month, assuming an estuarine initiation site with negligible offshore advection, no grazing losses, negligible competition from other phytoplankton groups, and no nutrient limitation; (3) maximal grazing pressure could not prevent the initiation of a red tide or cause its termination, assuming no other losses to algal biomass and a zooplankton community ingestion rate similar to that of Acartia tonsa; and (4) the light-cued ascent behavior of K. brevis served as an aggregational mechanism, concentrating K. brevis at the 55μEm−2s−1 isolume when mean concentrations of K. brevis exceeded 100,000cellsL−1. Further improvements in model fidelity will be accomplished by the future inclusion of phytoplankton competitors, disparate nutrient availability and limitation schemes, a more realistic rendering of the spectral light field and the attendant effects of photo-inhibition and compensation, and a mixed community of vertically-migrating proto- and metazoan grazers. These model refinements are currently under development and shall be used to aid progress toward an operational model of red tide forecasting along the WFS.
Journal: Continental Shelf Research - CONT SHELF RES , vol. 28, no. 1, pp. 112-136, 2008
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    • ...The CCMP 2229 strain was isolated from the central Florida coast, near Manasota, in the same geographic region where nearshore blooms of K. brevis have been shown to persist for extended periods of time and also may be a region where nearbottom populations persist (Milroy et al., 2008)...
    • ...The observation of populations near the sediment–water interface (Sinclair et al., 2006a; Milroy et al., 2008) suggest that K. brevis may derive nutrients from the sediment...
    • ...The CCMP 2229 strain was isolated in a region where harmful algal blooms frequently occur (Walsh et al., 2006) and where nearbottom populations have been observed (Milroy et al., 2008)...

    Geoff Sinclairet al. Growth, uptake, and assimilation of ammonium, nitrate, and urea, by th...

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