Interactions among microbial cells can generate new chemistries and functions. but exploitation requires establishment of communities that reliably recapitulate community-level phenotypes. Using mechanistic mathematical models. we show how simple manipulations to population structure can exogenously impose Darwinian-like properties on communities. https://www.roneverhart.com/Ferrofish-A32pro-32-Channel-AD-DA-Converter-with-MADI-and-ADAT-p18115/