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Rediversification Following Ecotype Isolation Reveals Hidden Adaptive Potential.

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Microbial communities can regenerate diversity after species loss, forming new ecotypes that coexist via frequency-dependent selection. These rediversified communities show distinct traits and transcriptional patterns compared to the original ones.

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Area of Science:

  • Microbial ecology and evolutionary biology.
  • Investigating ecological community dynamics and resilience.

Background:

  • Microbial diversity is crucial for ecosystem functioning.
  • Understanding how communities recover ecological diversity after species extinction is limited.

Approach:

  • Utilized simple two-ecotype communities from the Escherichia coli (E. coli) Long Term Evolution Experiment (LTEE).
  • Isolated one ecotype to observe rediversification and analyzed coexistence mechanisms.
  • Compared rediversified communities with original ones, examining growth traits, survival, and transcriptional states.

Key Points:

  • Simple E. coli communities consistently rediversified into two coexisting ecotypes after species isolation.
  • Rediversification occurred similarly across communities with over 30,000 generations of evolutionary divergence.
  • Rediversified ecotypes shared some traits with the replaced ecotype but differed in coexistence mechanisms and transcriptional patterns.

Conclusions:

  • Evolution allows for alternative diversification pathways even in simplified communities.
  • Perturbations like species removal can significantly impact the evolution of ecological communities.
  • The potential for alternative evolutionary pathways may be greater in more complex, multi-species communities.