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Delayed Shift in Microbiota Composition in a Marine Microcosm Pollution Experiment.

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Pollution events like nitrate and sulfate addition can cause surprising, delayed shifts in benthic microbial communities, reducing species richness and altering key nitrogen cycling processes, indicating potential ecosystem tipping points.

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Area of Science:

  • Marine microbiology
  • Ecosystem ecology
  • Biogeochemistry

Background:

  • Benthic habitats are crucial for marine ecosystems but vulnerable to pollution.
  • Oligotrophic conditions make these environments susceptible to anthropogenic impacts.

Purpose of the Study:

  • To investigate the impact of simulated pollution (nitrate, sulfate, organic carbon) on benthic microbiota composition.
  • To understand the temporal dynamics of microbial community response to pollution events.

Main Methods:

  • Microcosm experiments simulating pollution events.
  • Analysis of microbiota composition over one month post-disturbance.
  • Measurement of key nitrogen cycling processes (nitrification, DNRA, denitrification).

Main Results:

  • Nitrate addition caused a rapid, threefold reduction in species richness, favoring Pseudarchobacter and increasing Dissimilatory Nitrate Reduction to Ammonium (DNRA).
  • Sulfate addition led to a delayed, weaker reduction in species richness, shifting communities towards spore-forming Firmicutes and increasing DNRA under oxic conditions.
  • Delayed responses suggest microbial adaptations, such as sulfide utilization for denitrification or spore germination, and a potential shift in nitrogen metabolism.

Conclusions:

  • Simulated pollution events trigger delayed, abrupt shifts in benthic microbial communities, resembling ecosystem tipping points.
  • These shifts can alter crucial ecosystem functions like nitrogen cycling.
  • The findings highlight the potential for overlooked microbial responses in natural ecosystems facing pollution stress.