Relief of CsrA repression increases lysis and results in loss of biodiversity in M9-glucose. (A) Kymograph of a section of a microhabitat showing typical community dynamics of sensitive (green), resistant (red) and pColE2-TT carrying producer cells (blue). Producer and resistant cells grow readily while sensitive cells either show no growth, become filamentous, or die. (B) Corresponding growth curves (time versus occupancy) of the section shown in (A). (C) Microscopy images and induction-lysis curves of producer cells carrying the pColE2-TT mutant plasmid, the E2crimson reporter for colicin induction (shown in red), and expressing YFP constitutively (green) growing in M9-glucose. Induction-lysis curves of the cells labelled in the microscopy images show a steep drop in fluorescence intensity after induction, indicating lysis.