In big groups, bacteria that usually fight each other for food can suddenly flip a switch and start helping each other out.
arXiv · March 17, 2026 · 2603.15052
The Takeaway
Traditional ecology assumes that closely related strains are fierce competitors because they require the same food. This research reveals that when these strains are embedded in a diverse community, the surrounding crowd masks their competition, making them behave as if they are in a mutualistic partnership.
From the abstract
Microbial communities harbor extensive fine-scale diversity: closely-related strains of the same species coexist alongside many distantly-related taxa. Yet strain coexistence remains poorly understood, largely because most studies neglect the diverse communities in which strains are embedded. Here we combine community ecology and statistical physics to study the dynamics of closely-related strains in a community context. We demonstrate that in a diverse community, indirect interactions between s