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Antibiotics reduce Pocillopora coral-associated bacteria diversity, decrease holobiont oxygen consumption and

Michael T Connelly1, Grace Snyder1, Ana M Palacio-Castro2,3

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This summary is machine-generated.

Antibiotic treatment disrupted coral bacteria, reducing holobiont oxygen consumption and activating coral immunity. This highlights the crucial role of native coral-associated bacteria in maintaining coral health and symbiosis.

Keywords:
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Area of Science:

  • Marine biology
  • Microbial ecology
  • Coral reef science

Background:

  • Coral-microbe interactions are vital for holobiont health.
  • Understanding bacterial roles requires experimental manipulation.
  • Coral-associated bacteria influence nutrient cycling and pathogen defense.

Purpose of the Study:

  • To investigate the impact of antibiotic-induced bacterial community disruption on coral health.
  • To assess changes in coral physiology and gene expression following bacterial manipulation.
  • To establish a baseline for future coral symbiosis experiments.

Main Methods:

  • Antibiotics (ampicillin, streptomycin, ciprofloxacin) used to disrupt bacterial communities in Pocillopora corals.
  • Measured Symbiodiniaceae photochemical efficiency and holobiont oxygen consumption.
  • Analyzed bacterial community composition and coral gene expression (RNAseq).

Main Results:

  • Antibiotics altered bacterial community structure, reducing diversity.
  • Coral oxygen consumption decreased, while Symbiodiniaceae photosynthesis remained unaffected.
  • Host immunity and stress response genes were upregulated at the expense of metabolic functions.

Conclusions:

  • Disrupting native coral bacteria negatively impacts holobiont health.
  • Coral-associated bacteria are essential for maintaining coral physiology and function.
  • Experimental reduction of bacterial diversity is a viable approach for future symbiosis studies.