There are rare bodies of water that rely on natural eutrophication

These light-deprived plants die off and decompose in a process which uses up the water already depleted oxygen supply.Over time, this can reduce the oxygen content to less than 2 milligrams of oxygen per liter,creating an uninhabitable dead zone.There are rare bodies of water that rely on natural eutrophication.Regions like the Bay of Bengal are full of bottom-dwelling marine life that has adapted to low-oxygen conditions.