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Environmental modulators of algae-bacteria interactions at scale.

Chandana Gopalakrishnappa1, Zeqian Li2, Seppe Kuehn3

  • 1Department of Physics, The University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.

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Summary

pH significantly impacts algae-bacteria interactions, influencing nutrient and carbon availability effects. This research clarifies how environmental factors shape microbial communities for better understanding of global primary production.

Keywords:
algae-bacteria interactionsbuffering capacityecological interactionshigh-throughput microfluidic platformpHphototroph-heterotroph interactions

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Area of Science:

  • Microbiology
  • Environmental Science
  • Biogeochemistry

Background:

  • Microbial interactions are crucial for global primary production.
  • Understanding these interactions is difficult due to complex chemical environments.

Purpose of the Study:

  • To investigate algae-bacteria interactions across diverse environmental conditions.
  • To determine the influence of pH, carbon, and phosphorus on these interactions.

Main Methods:

  • Utilized a massively parallel droplet microfluidic platform.
  • Created over 100,000 microbial communities.
  • Analyzed interactions across 525 environmental conditions.

Main Results:

  • Algae-bacteria interaction dependence on nutrients is modulated by pH and buffering capacity.
  • The type of organic carbon available dictates how pH, buffering, and nutrients affect interactions.
  • pH plays a critical, previously underestimated role in modulating these interactions.

Conclusions:

  • pH is a key factor in regulating phototroph-heterotroph interactions.
  • The study provides a framework for studying these interactions in natural settings.