The Quanta Podcast Audio Edition: The Ecosystem Dynamics That Can Make or Break an Invasion
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Mar 5, 2026 Researchers use microbes as fast, controllable ecosystems to test what makes communities vulnerable to invasions. They explore diversity, interaction strength, and surprising phase shifts that change stability. Experiments show fluctuating, species-rich microcosms can be far more invadable. Models recreate these patterns and raise questions about dynamics in longer-lived systems.
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Elton's Diversity Resistance Hypothesis Falters
- Elton predicted more diverse ecosystems resist invaders because niches are filled and predators control newcomers.
- Field data conflict with this: some diverse systems repel invaders while others are easily overtaken, making the relationship unclear.
Microbial Microcosms Model Ecosystems
- Jeff Gore's lab grows hundreds of 96-well microbial communities as analogs for guts, reefs, or forests.
- Each well holds 20 species from MIT samples, sequenced later to track who survives and how interactions change.
Phase Transitions Explain Community Stability
- Increasing species number or interaction strength drove phase transitions: stable, species-loss, then wild oscillations.
- Phase three's oscillations indicate loss of stability and higher diversity in fluctuating states.