The effect of zinc on aquatic microbial ecosystems and the degradation of dissolved organic matter

► Our modelling study investigates potential effects of zinc on microbial ecosystems. ► The model comprises a traditional food chain and a microbial loop. ► Zinc-inhibited bacterial DOM uptake suppresses the growth of zooplankton or protozoa. ► Grazing preference of zooplankton affects the most vulnerable group to zinc. ► Supply of DOM from photosynthesis makes the microbial ecosystem resistant to zinc.