Human activities may greatly accelerate. The process of eutrophication, because nutrients are carried into lakes from farm feedlots and sewage.
Even if solid wastes are removed, water discharges from sewage treatment plant is often rich in phosphate and nitrates dissolved from wastes and detergens.
Excessively enriched water also washes off fertilizers from fields where the mature of thousands of cattle is accumulated. These added nutrients support excessive growth of phytoplankton. Produces like blue-green algae form a scum on the lake surface, depriving the submerged plant of sunlight, as a result they die. The dead plant bodies are decomposed by bacteria, utilizing oxygen present in the water, deprived of oxygen, fish, snails and insect larva die and their decaying bodies fuel, snails more bacterial growth, further, depleting that oxygen.
Even without oxygen, certain bacteria that produced foul smelling gases thrive. Although it is full of life and nutrients, polluted lake smells.
Most of the trophic levels including the fish eliminate and the bacteria and blue, green, alga, dominate the community.
Few organisms can with stand the low Ph of acidified lakes.
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