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ES10k
Question | Answer |
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1. What causes cultural eutrophication? | Too many nutrients get into surface water |
2. What are the effects of cultural eutrophication? | First: Algal bloom. Eventually algae and submerged aquatic veg (shadowed by algae) dies. next: Many decomposers do cellular respiration -- feeding of this dead matter while consuming oxygen. Later: Dissolved oxygen in water is greatly reduced or deplet |
3. What causes a high level of BOD? How does it affect DO? | High BOD is a result of much organic waste in the water. It affects DO b/c bacteria have a higher demand for oxygen when there is more for them to eat. The higher the BOD, the lower the DO. |
4. Give an example of a point source of pollution that contributes to cultural eutrophication. | Wastewater treatment plant, CAFOs (feedlots, dairy, hog, and poultry farms) |
5. Give an example of a nonpoint source of pollution that contributes to cultural eutrophication. | Fertilizers used on lawns and crops; livestock on grazing land |
6. What are some ways that individuals at their homes or businesses can prevent cultural eutrophication? | Reduce fertilizer use on lawns; use phosphate-free detergents |
7. Can a body of water recover from cultural eutrophication? How? | Yes. After algae use up nutrients in water and no more nutrients get into the water. There’s less food for decomposers, so there are fewer of them – BOD declines and DO rises. |