The time-development of species communities cannot be understood solely through ecological interactions or environmental factors, as evolution can also alter community dynamics. This observation helps to understand, among other things, the consequences of antibiotic resistance.

Evolution can alter the composition of communities, but its effects are difficult to investigate in nature, as they begin to manifest only after long periods of time. However, the rapid pace of microbial reproduction makes it possible to observe evolution in the laboratory “in real time,” from one generation to the next.

“In studies focusing on the microbiome, using synthetic microbial communities, as we did in this study, has opened up new avenues for investigating key questions related to complex communities,” says Professor Teppo Hiltunen from the University of Turku.