4.6 Article

Algal volatiles - the overlooked chemical language of aquatic primary producers

Journal

BIOLOGICAL REVIEWS
Volume 97, Issue 6, Pages 2162-2173

Publisher

WILEY
DOI: 10.1111/brv.12887

Keywords

algae; biogenic volatile organic compounds (BVOCs); chemical cues; chemical ecology; cyanobacteria; freshwater; infochemicals; marine

Categories

Funding

  1. Plymouth Marine Laboratory
  2. Deutsche Forschungsgemeinschaft [DFG FI-1548/9-1]
  3. Projekt DEAL

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This review discusses the ecological roles of volatile compounds from freshwater and marine microalgae and macroalgae. The functions of these compounds range from intraspecific communication to defence against competitors and predators. Despite current understanding, there are still knowledge gaps and emerging questions in algal volatile research.
Volatiles are important 'infochemicals' that play a crucial role in structuring life on our planet, fulfilling diverse functions in natural and artificial systems. Algae contribute significant quantities to the global budget of volatiles, but the ecological roles of aquatic volatiles are not well understood. In this review, we discuss the current knowledge of volatile compounds from freshwater and marine microalgae and marine macroalgae, with a focus on their ecological roles. We highlight the multiple reported functions of biogenic volatiles, ranging from intraspecific communication for reproduction, intra-bloom signalling and antioxidant functions, to various interspecific signal exchanges that may allow herbivores to locate them and function in defence against competitors and predators. Beyond reviewing our current understanding, we specifically highlight major knowledge gaps and emerging questions for algal volatile research. These novel perspectives have the potential to improve our understanding of aquatic ecosystems and thus need to be addressed in future research. Filling these gaps and addressing these questions will facilitate humanity's efforts to exploit aquatic volatiles in various applications.

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