Characterizing a stable five-species microbial community for use in experimental evolution and ecology

Area of Science:

• Microbial Ecology
• Evolutionary Biology
• Community Ecology

Background:

• Model microbial communities are crucial for testing ecological and evolutionary theories due to their manipulability and rapid generation times.
• A fundamental assumption in using model communities is their stable coexistence, which is often experimentally unevaluated.
• The development of stable, well-characterized model communities is essential for advancing high-throughput ecological and evolutionary research.

Purpose of the Study:

• To assemble and characterize a stable five-species microbial community from a soil metacommunity.
• To experimentally validate the stable coexistence of all five species over an extended period.
• To provide a robust model system for future investigations into microbial ecology and evolution.

Main Methods:

• Reciprocal invasion-from-rare experiments were employed to assess species coexistence and community stability.
• Species identification was achieved through distinct plate morphologies, validated over extended co-culture periods (>1 year).
• Pairwise species interactions were characterized, and high-quality reference genomes were generated for each constituent species.

Main Results:

• All five species demonstrated stable coexistence within the assembled microbial community.
• The community exhibited long-term stability, persisting for approximately 600 generations.
• Individual species were reliably identifiable by their unique colony morphologies even after prolonged co-cultivation.

Conclusions:

• A stable, five-species microbial community has been successfully assembled and validated.
• This model community is suitable for long-term experimental manipulation and the testing of key ecological and evolutionary hypotheses.
• The characterized interactions and genomic data provide a foundation for future research in microbial community dynamics.