1. EVALUATING WATER SYSTEM HEALTH

2. Warm up How do nutrients move in the ocean as a result of upwelling?
A. from deep, colder areas to warm, shallow areas
B. from warm, shallow areas to deep, colder areas
C. from the ocean floor into estuaries
D. from estuaries to the ocean floor

3. Water system
A water system is a body of water

4. Indicators of water system health
Signs that the water is healthy:
Physical, chemical and biological indicators

5. Physical indicators
Temperature- moderate to cool, cold water can hold more dissolved oxygen
Dissolved oxygen (DO)- the amount of oxygen dissolved in the water
pH- how acid or basic the water is- most are 7.0 neutral to slightly basic ( )
Turbidity- how clear the water is- high turbidity is unclear water

6. Chemical indicators
Nitrates- nitrogen compounds used for growth by plants and algae
Can cause algal blooms

7. Biological indicators
Bio- living
Bio-indicators- organisms that are used to assess ecosystem health
The presence of certain species in water can show that the water is healthy
Example- trout