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We introduce a new Wright-Fisher type model for seed banks incorporating"simultaneous switching", which is motivated by recent work on microbialdormancy. We show that the simultaneous switching mechanism leads to a newjump-diffusion limit for the scaled frequency processes, extending theclassical Wright-Fisher and seed bank diffusion limits. We further establish anew dual coalescent structure with multiple activation and deactivation eventsof lineages. While this seems reminiscent of multiple merger events in generalexchangeable coalescents, it actually leads to an entirely new class ofcoalescent processes with unique qualitative and quantitative behaviour. Toillustrate this, we provide a novel kind of condition for coming down frominfinity for these coalescents using recent results of Griffiths.

The seed bank coalescent with simultaneous switching