1. Nutrient Cycles

2. Nutrient Cycles the earth is a closed system
matter and energy are continually recycled

4. A closed System
Biosphere II
Biosphere II today

5. A closed system
Biosphere I

6. the availability of nutrients can be increased or decreased due to human activity
thus the balance is altered
this imbalance compromises sustainability

7. The Impacts of Human Activities
SUSTAINABILITY
The Impacts of Human Activities

8. ~ Eutrophication ~
Fertilizers in the Environment!

9. Eutrophication - animation
Eutrophication is a process in which nutrient levels in aquatic ecosystems increase.
Eutrophication can lead to increased numbers of primary producers (algae)

10. Eutrophication
Cultural Eutrophication – the process is accelerated due to human activities

11. Factors that influence Eutrophication
Fertilizers and nutrients enter an ecosystem intentionally or accidentally:
Example (intentionally) : Sewer system running into a river
Example (accidentally) : Run off from agricultural land

12. Nitrogen and phosphorus are the two elements most responsible for eutrophication.
nitrates phosphates
nitrites
ammonia

13. Phosphorus concentrations Nitrogen Concentrations
Human Factors that Influence Eutrophication:
Phosphorus concentrations
Septic systems
Detergents
Fertilizer run off
Animal wastes
Paving and development
Industrial waste
Water treatment plants
Forest fires
Synthetic materials
Nitrogen Concentrations
Septic Systems
Fertilizer run off
Animal excrements
Industrial wastes
Fossil fuels

14. What are the effects of Eutrophication?
Algal bloom
Low oxygen levels for aquatic organisms
Animal Mutations and death

15. To Do:
Read Pages
Complete the back of your sheet of notes

16. Answers to text questions Science in the News!
Video – Battling the Bloom – Lake Erie

17. Video – Sick Fish, Eutrophication and Dead Zones