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.

Suggested Citation:

Lenes, Jason . 2013. Dataset for: Simulating cell death in the termination of Karenia brevis blooms: Implications for predicting aerosol toxicity vectors to humans. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N73N21C0

Publications:

Lenes, J., Walsh, J., & Darrow, B. (2013). Simulating cell death in the termination of Karenia brevis blooms: implications for predicting aerosol toxicity vectors to humans. Mar. Ecol. Prog. Ser., 493, 71–81. doi:10.3354/meps10515

Weisberg, R. H., Zheng, L., Liu, Y., Corcoran, A. A., Lembke, C., Hu, C., … Walsh, J. J. (2016). Karenia brevis blooms on the West Florida Shelf: A comparative study of the robust 2012 bloom and the nearly null 2013 event. Continental Shelf Research, 120, 106–121. doi:10.1016/j.csr.2016.03.011

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.

Data Parameters and Units:

Linear and non-linear lysis terms. K. brevis (mmol C m-3), diatoms (mmol C m-3), Trichodesmium (mmol C m-3), microflagellates (mmol C m-3), ammonifying bacteria (mmol C m-3), nitrifying bacteria (mmol C m-3), NO3 (mmol N m-3), NH4 (mmol N m-3), DON (mmol N m-3), PO4 (mmol P m-3), DOP (mmol P m-3), dFe (mmol Fe m-3), SiO4 (mmol Si m-3), lysis (mmol C m-3 d-1)

Individual Files: