Natalia Derossi

Water plants of all sizes, from the 60-meter long Pacific Ocean giant kelp (Macrocystis pyrifera) to the micro ur-plant blue-green algae, deserve attention from critical plant studies. This is the first book in environmental humanities to approach algae, swimming across the sciences, humanities, and arts, to embody the mixed nature and collaborative identity of algae. Ranging from Medieval Islamic texts describing algae and their use, Japanese and Nordic cultural practices based in seaweed and algae, and confronting the instrumentalization of seaweed to mitigate cow methane release and the hype of algal photobioreactors, amongst many other standpoints, this volume comprehensively addresses the ancestors of terrestrial plants through appreciating their unique aquatic medium.

Microalgae in the wild often form consortia with other species promoting their own health and resource foraging opportunities. The recent application of microalgae cultivation and deployment in commercial photobioreactors (PBR) so far has focussed on single species of algae, resulting in multi-species consortia being largely unexplored. Reviewing the current status of PBR ecological habitat, this article argues in favor of further investigation into algal communication with conspecifics and interspecifics, including other strains of microalgae and bacteria. These mutualistic species form the ‘phycosphere’: the micro-environment surrounding microalgal cells, potentiating the production of certain metabolites through biochemical interaction with cohabitating microorganisms. A better understanding of the phycosphere could lead to novel PBR configurations, capable of incorporating algal-microbial consortia, potentially proving more effective than single-species algal systems.