Algae Communication: Nature’s Oldest Networks for Sustainability and Biotechnology

Algae, the ancient oxygenators of Earth, are increasingly recognized as dynamic communicative systems rather than passive photosynthetic organisms. This paper introduces a comprehensive framework for understanding algal communication and its implications for biotechnology and sustainability. We synthesize current knowledge of algal signaling—chemical, optical, electrical, and physical—and illustrate how these mechanisms underpin resilience, coordination, and ecosystem regulation. Building on this foundation, we highlight engineered applications where algal communication has been harnessed for bioenergy, bioremediation, medicine, and agriculture. Finally, we identify key research challenges, including decoding the algal interactome, designing biohybrid interfaces, and addressing ethical considerations in deploying communicative organisms. By connecting algal biology with principles of communication engineering and network theory, this work positions algae as living blueprints for robust, distributed, and programmable systems, offering a transformative path toward sustainable innovation. Our paper’s contributions are multidisciplinary: it provides biologists with a new network framework for algal behavior; offers engineers biological prototypes for distributed communication systems; gives interdisciplinary researchers a unifying bridge for collaboration; and supplies applied scientists with a roadmap for the next generation of communication-focused algal biotech.