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Understanding photosynthetic biofilm productivity and structure through 2D simulation

Bastien Polizzi 1 Andrea Fanesi 2 Filipa Lopes 2 Magali Ribot 3 Olivier Bernard 4 
4 BIOCORE - Biological control of artificial ecosystems
CRISAM - Inria Sophia Antipolis - Méditerranée , LOV - Laboratoire d'océanographie de Villefranche, INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement
Abstract : We present a spatial model describing the growth of a photosynthetic microalgae biofilm. In this 2D-model we consider photosynthesis, cell carbon accumulation, extracellular matrix excretion, and mortality. The rate of each of these mechanisms is given by kinetic laws regulated by light, nitrate, oxygen and inorganic carbon. The model is based on mixture theory and the behaviour of each component is defined on one hand by mass conservation, which takes into account biological features of the system, and on the other hand by conservation of momentum, which expresses the physical properties of the components. The model simulates the biofilm structural dynamics following an initial colonization phase. It shows that a 75 μ m thick active region drives the biofilm development. We then determine the optimal harvesting period and biofilm height which maximize productivity. Finally, different harvesting patterns are tested and their effect on biofilm structure are discussed. The optimal strategy differs whether the objective is to recover the total biofilm or just the algal biomass.
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https://hal.inria.fr/hal-03700020
Contributor : Jean-Luc Gouzé Connect in order to contact the contributor
Submitted on : Thursday, August 11, 2022 - 2:52:06 PM
Last modification on : Friday, September 2, 2022 - 3:20:42 PM

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Bastien Polizzi, Andrea Fanesi, Filipa Lopes, Magali Ribot, Olivier Bernard. Understanding photosynthetic biofilm productivity and structure through 2D simulation. PLoS Computational Biology, Public Library of Science, 2022, 18 (4), pp.e1009904. ⟨10.1371/journal.pcbi.1009904⟩. ⟨hal-03700020⟩

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