Researchers studied symbiont communities in amphibians from California wetlands to understand how spatial structure, habitat filtering, and host community components affect symbiont occupancy. They found that symbiont community patterns varied across years, with species turnover influenced by spatial and host community factors. Symbiont occupancy increased in southeastern wetlands, and snail community composition had strong effects on most symbiont taxa. Spatial components and host community composition were found to drive symbiont community composition in this system, shedding light on spatial community dynamics.