Lecture eighteen

Question 0

Is a resource sustainable if it is nonrenewable? Slowly renewable? Quickly renewable?

Answer 0

Never, no, may be

Question 1

What is sustainable yield?

Answer 1

Max number of individuals available to be harvested from a population without diminishing the ability of the population to regenerate over the long term

Question 2

Maximum sustainable yield. What is it’s goal?

Answer 2

Largest average yield that can be continuously taken from a population without causing decline

Maximize economic gains

Question 3

What is the optimal size to keep a population at for harvesting?

Answer 3

K/2

Question 4

What are the five problems with maximum sustainable yield?

Answer 4

Hard to quantify N at a given time
Enviro conditions change K constantly
D-I factors can be unpredictable
Age structure of populations change
Fail to incorporate economics

Question 5

What caused the decline in Atlantic cod?

Answer 5

Overestimate of N –> set harvest rates too high

Annual harvest rates were higher than scientists recommended

Question 6

What were the consequences?

Answer 6

Fishing moratorium, unemployment, small towns suffered

Question 7

What is population resilience? Which population types (r or K selected) have a higher resilience?

Answer 7

Rate at which a pop returns to equilibrium size after a pop crash

R selected has higher resilience due to short amount of time needed to return to K