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Flashcards in October 5 Deck (21):
1

Why does eutrophication pose a threat to an aquatic ecosystem?

It changes the biodiversity in the body of water

2

What does oligo trophic mean?

Nutrient poor waters

3

What can reduce eutrophication and leeching?

Biological nitrogen fixation (BNF)

4

What is a macrosource?

A source that gives a lot of one nutrient

5

Define point source pollution.

Water pollution that comes from a single discrete place.

6

What does BOD stand for and what does it mean.

Biological oxygen demand, this is the measure of the amount of oxygen a body of water can absorb

7

What can happen to a body of water when excess phosphorus and nitrogen is introduced?

Rapid algae growth causing an increase in BOD
Dead zones can be created
Oxygen is a limiting factor for fish species

8

What is a dead zone?

An area in the ocean that is oxygen depleted. There are approximately 200 today

9

Clean rain has a pH of _____.

5.6

10

Acid rain has a pH of ____.

2.5

11

Does acid rain affect crustaceans?

Yes they are made of calcium and it dissolves their shells

12

True or false
Benthic plants can survive in water that is slightly acidic.

True

13

Where is acid rain more likely to occur, western or eastern Canada?

Eastern

14

What is acid shock?

It occurs in spring in Canada when snow melts, there is a sudden pH drop that can kill spawning species and cause deformities

15

Why is the effect of acid rain so much more prominent in higher altitudes than lower ones?

Because trees in higher elevated areas are already under added stress

16

What is buffering capability?

A surplus of minerals, the ability to keep lots of minerals in the soils

17

True or false
The prairies have a low buffering capability

False

18

What makes acid rain so difficult to control?

It is an international issue, acid rain could be from across the ocean from you

19

What is the difference between PTV and STV?

Policy target values are set by politicians and scientific target values are set by scientists

20

What two oxides contribute to acid rain?

Sulfur and nitrogen

21

What is eutrophication?

Nitrogen and phosphorus fertilizer going into water