- Algal Blooms
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- Slide Set 91_101, Slide 27. Animal Wastes and Water Quality. Thick algal mat in shallow pond. Algal blooms in ppnds or streams consume the new-found supply of nitrogen and phosphorus. They use up other essential nutrients and begin dying off in large numbers. Billions of dead algae cells then become sludge that must itself be decomposed by microorganisms.