Abstract

A non-linear lysis term for simulation of K. brevis HAB termination on the West Florida Shelf is introduced, with the assumption that particle encounters of planktonic microalgae and bacteria can be described as the square of the phytoplankton biomass. This formulation also accounts for nutrient-limitation of K. brevis as a precondition for susceptibility to bacterial and viral attack, and potentially programmed cell death. Two model simulations were run of linear and non-linear lysis cases. Model output was compared against observed weekly maximum K. brevis concentrations, with statistical metrics calculated over three HAB phases during 2001. Introduction of the non-linear lysis term increased the modeling efficiency by 0.68 due to improved reproduction of the bloom termination.

Purpose

This study describes the relationships among particle encounters, susceptibility to bacterial and viral attack, and K. brevis HAB termination. Following Lenes et al. 2012, previous studies represent model output using a linear lysis equation for K. brevis mortality. The new lysis term is the model simulation output using a new non-linear term after Lenes et al. 2013 in order to improve the model output/data fit.

Keywords

Karenia brevis, Aerosol toxicity

UDI

R1.x135.122:0003

Date

3-18-2016 12:00 AM

Point of Contact

Lenes, Jason
University of South Florida
College of Marine Science
140 7th Ave South
St. Petersburg , FL 33701
USA
lenes@usf.edu

Funding Source

RFP-I

Start of Data Collection

1-1-2001

End of Data Collection

12-31-2001

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