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Niche Separation Increases With Genetic Distance Among Bloom-Forming Cyanobacteria.

Nicolas Tromas1, Zofia E Taranu2, Bryan D Martin3

  • 1Département de Sciences Biologiques, Université de Montréal, Montreal, QC, Canada.

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|April 12, 2018
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Summary
This summary is machine-generated.

Ecological niches of bacterial strains evolve over time. Closely related strains generally share similar niches, but competition and convergent evolution also shape microbial community structure.

Keywords:
DolichospermumMicrocystiscompetitioncyanobacteriaecological nichehabitat filteringniche partitioning

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Area of Science:

  • Microbial Ecology
  • Evolutionary Biology
  • Limnology

Background:

  • Bacterial communities comprise interacting lineages with distinct ecological niches.
  • Understanding niche evolution and relatedness is crucial for microbial ecology.
  • Cyanobacterial genera like Microcystis and Dolichospermum often coexist during blooms, suggesting niche overlap.

Purpose of the Study:

  • Investigate the evolution of niche preference in bacterial lineages.
  • Determine if genetic relatedness influences niche sharing among strains.
  • Analyze niche partitioning within Microcystis and Dolichospermum genera.

Main Methods:

  • Long-term (8-year) study of Lake Champlain bacterial communities.
  • 16S amplicon sequencing for lineage identification.
  • Minimum entropy decomposition (MED) for strain resolution within genera.
  • Measurement of environmental parameters (nutrients, toxins, temperature, precipitation).

Main Results:

  • Genus-level niche differentiation observed for Microcystis and Dolichospermum regarding nitrogen and phosphorus.
  • Intra-genus strains showed differential associations with temperature, precipitation, nutrients, and toxins.
  • Niche similarity generally decreased with increasing genetic distance, supporting habitat filtering.
  • Specific niche dimensions (particulate nitrogen and phosphorus) exhibited non-linear relationships with genetic distance.

Conclusions:

  • Habitat filtering is a primary driver of niche similarity among closely related bacterial strains.
  • Competition and convergent evolution play significant roles in shaping niche dynamics, particularly for specific traits.
  • Niche partitioning occurs within cyanobacterial genera, influenced by complex ecological interactions.