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The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
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Related Experiment Video

Updated: May 3, 2026

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Complex interplay between the microalgae and their microbiome in production raceways.

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Microalgae raceways host diverse microbiomes influencing Desmodesmus armatus health. Understanding these microbial communities is key for optimizing wastewater treatment and biomass production.

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Area of Science:

  • Microbiology
  • Environmental Science
  • Biotechnology

Background:

  • Algae-associated microbiomes in large-scale microalgae reactors remain underexplored.
  • Understanding these microbial communities is crucial for optimizing microalgae cultivation for industrial applications.
  • The influence of microbial dynamics on the health and productivity of Desmodesmus armatus in raceway ponds is not well understood.

Purpose of the Study:

  • To investigate the microbial community structure and dynamics in microalgae raceways over extended periods.
  • To identify key microbial players associated with healthy and unhealthy Desmodesmus armatus cultures.
  • To explore potential ecological interactions between the microalga and its associated microbiome.

Main Methods:

  • Monitoring microbial dynamics in two raceway ponds (wastewater vs. clean water) over two 8-month periods.
  • Sampling, DNA extraction, and metabarcoding of 18S and 16S rRNA genes from pico and nano size fractions.
  • Network analysis to identify ecological interactions and correlations between microbial taxa and microalga abundance.

Main Results:

  • High eukaryotic and prokaryotic diversity was observed, with Chlorophyta, Fungi, Alphaproteobacteria, Gammaproteobacteria, Actinobacteria, and Bacteroidia as dominant groups.
  • Distinct microbial communities (ASVs) were associated with healthy (>70% D. armatus) and unhealthy (10-20% D. armatus) conditions.
  • Network analysis revealed predominantly positive ecological interactions, with specific bacteria and fungi identified as potentially beneficial or harmful.

Conclusions:

  • Microalgae raceways harbor complex and diverse microbiomes that significantly impact microalga health.
  • Identifying beneficial and harmful microbes offers potential for optimizing microalgae cultivation for wastewater treatment and biomass generation.
  • This study provides critical insights for managing and enhancing industrial microalgae production systems.