Temperature response of aquatic greenhouse gas emissions differs between dominant plant types

•The effect of experimental warming on GHG emissions differs between plant types.•Emissions and response to warming were highest with algae and free-floating plants.•CH4 ebullition was the GHG emission pathway most affected by experimental warming.•Anticipated shifts in plant dominance may represent a positive climate feedback.•Restoring submerged plant dominance may substantially mitigate GHG emissions.