Influence of infrastructure material composition and microtopography on marine biofilm growth and photobiology

Influence of infrastructure material composition and microtopography on marine biofilm growth and photobiology

Baptiste Vivier, Pascal Claquin, Christophe Lelong, Quentin Lesage, Mathias Peccate, Bastien Hamel, Marine Georges, Amel Bourguiba, Nassim Sebaibi, Mohamed Boutouil, Didier Goux, Jean-Claude Dauvin & Francis Orvain (2021): Influence of infrastructure material composition and microtopography on marine biofilm growth and photobiology, Biofouling, DOI: https://doi.org/10.1080/08927014.2021.1959918

The impact of concrete composition and roughness on the formation of microalgal biofilms and their photobiology were studied on marine infrastructures presenting four different compositions combined with two degrees of roughness (rough and smooth). The structures were first inoculated with a natural microphytobenthic biofilm and immersed in sterilised seawater with a controlled photoperiod for six days. Photosynthetic activity was assessed with an imaging PAM-(Pulse Amplitude Modulated) fluorometer and microtopography was monitored in parallel with a 3-D camera. The results indicated that roughness had an impact on the biofilm biomass, its physiological status and its photosynthetic efficiency and capacity. The assessment of surface roughness indicated that negative reliefs were preferably colonised by MPB (microphytobenthic) cells with better photosynthetic performances. Moreover, MPB biofilms showed better photoacclimation in these microhabitats than on the positive and smooth reliefs. This study confirms the importance of microhabitat for biofilm formation and their photobiology.

BOREA contact: Baptiste Vivier, baptiste.vivier@unicaen.fr and Francis Orvain, francis.orvain@unicaen.fr

Baptiste VIVIER's picture
Baptiste VIVIER
UCN Caen
PhD student
RECAP
Published on 20 Aug 2021
Updated on 20 Sep 2021