Biodilution, sometimes referred to as bloom dilution, is the decrease in concentration of an element or pollutant with an increase in trophic level. This effect is primarily observed during algal blooms whereby an increase in algal biomass reduces the concentration of pollutants in organisms higher up in the food chain, like zooplankton or daphnia. While most heavy metals bioaccumulate, under certain conditions, heavy metals and organic pollutants have the potential to biodilute, making a higher organism less exposed to the toxin.