Dissolved Oxygen

Question 1

Dissolved oxygen is essential for the health of what?

Answer 1

Aquatic life such as fish, insects, and micro-organisms.

Question 2

The level of dissolved oxygen in water depends on what 3 abiotic factors?

Answer 2

• temperature
• (rate of flow) turbulence due to wind or the speed of moving water
• wind

Question 3

The level of dissolved oxygen in water depends on what 3 biotic factors?

Answer 3

• the amount of photosynthesis by plants and algae in the water
• the number of organisms using up the oxygen

Question 4

Dissolved oxygen 8 PPM or mg/L
What for invertebrates

Answer 4

Large numbers of diverse invertebrates.

Question 5

Dissolved oxygen 6 PPM or mg/L
What for invertebrates

Answer 5

Mayflies, stoneflies, and beetles begin to disappear.

Question 6

Dissolved oxygen 4 PPM or mg/L
What for invertebrates

Answer 6

Freshwater shrimp, midge larvae, and worms can survive.

Question 7

Dissolved oxygen 2 PPM or mg/L
What for invertebrates

Answer 7

Midge larvae and some worms can survive.