Some of the worst effects of increased algae are the creation of dead zones. Nutrient runoffs create extreme areas of algae which block out the light from above that kills all the benthic organisms. Then once the algae start to die they are decomposed at such a high rate that the oxygen levels fall dramatically leaving an area of very low dissolved oxygen in which organisms cannot live in. Other harmful effects include closed beaches, poisoning of clams due to red tide, and water clarity problems.
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