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Unraveling the Unseen Players in the Ocean - A Field Guide to Water Chemistry and Marine Microbiology
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Functional tradeoffs underpin salinity-driven divergence in microbial community composition.

Chris L Dupont1, John Larsson2, Shibu Yooseph3

  • 1Microbial and Environmental Genomics, J. Craig Venter Institute, San Diego, California, United States of America.

Plos One
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Summary
This summary is machine-generated.

Salinity shapes bacterial communities and their metabolic functions, creating distinct freshwater and marine microbiomes. These functional differences, driven by central metabolism, likely evolved early in bacterial history.

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Area of Science:

  • Microbial Ecology
  • Environmental Microbiology
  • Genomics

Background:

  • Bacterial communities in the ocean change subtly across gradients.
  • Significant phylogenetic differences exist between freshwater and marine bacteria, but mechanisms are unclear.

Purpose of the Study:

  • To investigate if bacterial functional potential explains the divergence between freshwater and marine microbiomes.
  • To identify how salinity gradients impact microbial community composition and function.

Main Methods:

  • Metagenomic sequencing of microbial communities.
  • Analysis along an 1,800 km Baltic Sea salinity gradient (limnic to marine).
  • Multivariate statistical analyses to determine key environmental drivers.

Main Results:

  • Salinity is the primary driver of changes in microbial community composition and core metabolic functions.
  • Distinct metabolic pathways for respiration, biosynthesis, glycolysis, and osmolyte transport were found at high and low salinities.
  • Some bacteria, like SAR11, demonstrated adaptability across the entire salinity range.

Conclusions:

  • Differences in central metabolism at varying salinities dictate the divide between freshwater and marine microbiomes.
  • The ability to inhabit different salinity regimes likely evolved early in bacterial phylogeny.
  • Salinity must be considered in climate change models predicting altered precipitation and reduced salinity.